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Kubota ,RCK60B-23BX, Workshop Manual

The Kubota RCK60B-23BX Workshop Manual is a comprehensive resource for owners of this powerful lawn mower. This manual provides detailed instructions and diagrams to assist users in maintaining and repairing their equipment. Easily downloadable for free from our website, 88.208.23.73:8080, owners can access this manual to ensure optimal performance and longevity of their Kubota RCK60B-23BX.

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6.1.1 Checking clearance between tip of gear tooth and casing ..................................................... 7-50
6.1.2 Checking clearance between bushing and shaft ....................................................................7-51
6.1.3 Checking side plate thickness ................................................................................................7-51

6.2 Hydraulic cylinder............................................................................................................................7-51

6.2.1 Checking hydraulic cylinder bore............................................................................................7-51
6.2.2 Checking hydraulic arm shaft bushing....................................................................................7-52

8. ELECTRICAL SYSTEM

MECHANISM .....................................................................................................................................................8-1

1. Wiring diagram of BX tractor ....................................................................................................................8-1
2. Electrical connector chart .........................................................................................................................8-2
3. Reading electrical circuit diagrams...........................................................................................................8-3

3.1 Electrical wiring chart symbols ..........................................................................................................8-3
3.2 Layout of connector diagrams...........................................................................................................8-6
3.3 Precautions on handling electrical connectors..................................................................................8-7

4. Starting system.........................................................................................................................................8-8

4.1 Electrical circuit of starting system ....................................................................................................8-8
4.2 Function of relay................................................................................................................................8-9
4.3 Function of starter .............................................................................................................................8-9
4.4 Function of glow plug ......................................................................................................................8-10
4.5 Function of safety switch.................................................................................................................8-10
4.6 Function of fuel pump......................................................................................................................8-10

5. Operator presence control (OPC) system .............................................................................................. 8-11

5.1 Electrical circuit of OPC timer.......................................................................................................... 8-11

6. Charging system.....................................................................................................................................8-12

6.1 Electrical circuit for charging system...............................................................................................8-12
6.2 Function of IC regulator (3P connector type) ..................................................................................8-13

7. Lighting system.......................................................................................................................................8-14

7.1 Electrical circuit for lighting system .................................................................................................8-14

8. Gauges ...................................................................................................................................................8-15

8.1 Electrical circuit of gauge system....................................................................................................8-15
8.2 Meter panel .....................................................................................................................................8-16

8.2.1 Function of hour meter............................................................................................................8-16
8.2.2 Function of tachometer ...........................................................................................................8-16
8.2.3 Function of fuel gauge ............................................................................................................8-16
8.2.4 Function of coolant temperature gauge ..................................................................................8-16

8.3 Function of fuel level sensor ...........................................................................................................8-17
8.4 Function of coolant temperature sensor..........................................................................................8-17
8.5 Function of oil pressure switch........................................................................................................8-18

9. Others.....................................................................................................................................................8-19

9.1 Electrical circuit for accessory.........................................................................................................8-19
9.2 Function of DC outlet ......................................................................................................................8-20

SERVICING .....................................................................................................................................................8-21

1. Troubleshooting for electrical system .....................................................................................................8-21
2. Service specifications for electrical system ............................................................................................8-27
3. Tightening torques for electrical system .................................................................................................8-28
4. Checking and adjusting ..........................................................................................................................8-29

4.1 Battery.............................................................................................................................................8-29

4.1.1 Checking battery voltage ........................................................................................................8-29
4.1.2 Checking battery terminal connection.....................................................................................8-29
4.1.3 Checking battery specific gravity ............................................................................................8-29

4.2 Main switch .....................................................................................................................................8-30

4.2.1 Checking main switch connector voltage................................................................................8-30
4.2.2 Checking main switch continuity at off position.......................................................................8-30
4.2.3 Checking main switch continuity at on position ......................................................................8-31
4.2.4 Checking main switch continuity at preheat position ..............................................................8-31
4.2.5 Checking main switch continuity at start position ...................................................................8-31

4.3 Starter .............................................................................................................................................8-32

BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX

xiii

KiSC issued 03, 2019 A

Summary of Contents for ,RCK60B-23BX

Page 1: ...WORKSHOP MANUAL TRACTOR MOWER BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 2: ... tools Mechanism This section contains information on the structure and the function of the unit Before you continue with the subsequent sections make sure that you read this section Servicing This section primarily contains information below Troubleshooting Servicing specifications Service specifications Tightening torques Checking disassembling and servicing All illustrations photographs and spe...

Page 3: ...oint and corrective measure Search word Reference page 1 2017 April Addition of contents for the model BX1880 2 2019 February Added quick coupler disassembly and assembly 2 67 7 50 Revised service intervals Transmission fluid Transmission strainer 2 15 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX i KiSC issued 03 2019 A ...

Page 4: ...ii BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 5: ...L IDENTIFICATION 2 1 1 Tractor identification 2 1 1 1 Checking serial number and hour meter 2 1 1 2 Cylinder number 2 2 2 Checking mower identification 2 2 GENERAL PRECAUTIONS 2 3 HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING 2 5 LUBRICANTS FUEL AND COOLANT 2 7 1 BX tractor 2 7 1 1 Lubricants fuel and coolant 2 7 1 1 1 Fuel 2 8 1 1 2 Engine oil 2 8 1 1 3 Transmission oil 2 8 1 2 Overview of...

Page 6: ...Adjusting HST neutral spring 2 30 1 5 6 Adjusting brake pedal 2 31 1 6 Check point of every 200 hours 2 31 1 6 1 Replacing engine oil filter 2 31 1 6 2 Changing engine oil 2 32 1 6 3 Replacing transmission oil filter 2 33 1 6 4 Adjusting toe in 2 33 1 7 Check points of every 400 hours 2 33 1 7 1 Adjusting front axle pivot 2 33 1 7 2 Changing transmission fluid 2 34 1 7 3 Cleaning transmission stra...

Page 7: ...l seal 2 46 2 5 Check point of every 4 years 2 46 2 5 1 Replacing gear box oil seal 2 46 TIRES WHEELS AND BALLAST 2 47 1 Tires 2 47 1 1 Inflation pressure of tires 2 47 1 2 Dual tires 2 47 2 Wheel tread 2 47 2 1 Front wheels 2 48 2 2 Rear wheels 2 48 3 Ballast 2 49 3 1 Front ballast 2 49 3 2 Rear ballast 2 49 IMPLEMENT LIMITATIONS 2 51 1 Weight of implements as rear ballast 2 51 2 Implement limita...

Page 8: ...l system 3 12 4 2 Function of fuel filter 3 12 4 3 Function of fuel feed pump 3 12 4 4 Function of injection nozzle 3 12 SERVICING 3 15 1 Troubleshooting for engine 3 15 2 Servicing specifications for engine 3 19 3 Tightening torques for engine 3 28 4 Checking and adjusting 3 30 4 1 Engine body 3 30 4 1 1 Checking compression pressure 3 30 4 1 2 Checking valve clearance 3 30 4 2 Lubricating system...

Page 9: ... Checking push rod alignment 3 61 6 1 15 Checking oil clearance between tappet and tappet guide bore 3 62 6 2 Timing gears camshaft and governor gear 3 62 6 2 1 Checking timing gear backlash 3 62 6 2 2 Checking idle gear 1 side clearance 3 63 6 2 3 Checking camshaft side clearance 3 63 6 2 4 Checking camshaft alignment 3 64 6 2 5 Checking cam height 3 64 6 2 6 Checking oil clearance of camshaft jo...

Page 10: ... 1 2 Engaged function of PTO clutch 4 20 3 1 3 Disengaged function of PTO clutch 4 20 3 2 Structure of mid and rear PTO 4 21 4 Others 4 22 4 1 Hydraulic pump drive gear section 4 22 4 1 1 Structure of hydraulic pump drive gear 4 22 SERVICING 4 23 1 Troubleshooting for transaxle 4 23 2 Servicing specifications for transaxle 4 27 3 Tightening torques for transaxle 4 28 4 Checking and adjusting 4 29 ...

Page 11: ...oving rear axle case R H and brake 4 54 5 4 8 Removing PTO clutch assembly 4 55 5 5 Assembling shafts 4 55 5 5 1 Assembling select arms and HST pump shaft PTO clutch shaft 4 55 5 5 2 Assembling front wheel drive shaft shifter spiral bevel pinion shaft and mid PTO shaft 4 56 6 Servicing 4 57 6 1 Hydrostatic transmission 4 57 6 1 1 Checking center section 4 57 6 1 2 Checking charge relief valve 4 57...

Page 12: ...nd front gear case 5 12 5 2 3 Removing front gear case cover 5 12 5 2 4 Removing 36T bevel gear and front axle shaft 5 13 5 2 5 Removing front gear case and bevel gear case 5 13 5 2 6 Removing bevel pinion shaft and differential gear assembly 5 14 5 2 7 Removing differential gear 5 15 6 Servicing 5 15 6 1 Checking clearance between differential case and differential side gear 5 15 6 2 Checking cle...

Page 13: ...7 4 4 Control valve 7 4 4 1 Outline of control valve 7 4 4 2 Function of control valve 7 5 4 2 1 Control valve in neutral position 7 5 4 2 2 Control valve in lift position 7 6 4 2 3 Control valve in down position 7 7 5 Flow priority valve 7 8 5 1 Outline of flow priority valve 7 8 5 2 Structure of flow priority valve 7 9 5 3 Specification of flow priority valve 7 10 6 Relief valve 7 10 6 1 Outline...

Page 14: ...lic pump 7 39 5 2 Hydraulic cylinder block 7 40 5 2 1 Removing battery 7 40 5 2 2 Removing lift rod and lower link 7 41 5 2 3 Removing ROPS 7 41 5 2 4 Removing seat 7 41 5 2 5 Removing step 7 41 5 2 6 Removing fender 7 42 5 2 7 Removing fuel tank 7 42 5 2 8 Removing fender center stay 7 43 5 2 9 Removing mower linkage and wire harness 7 43 5 2 10 Removing hydraulic cylinder block 7 43 5 3 Hydrauli...

Page 15: ... lighting system 8 14 8 Gauges 8 15 8 1 Electrical circuit of gauge system 8 15 8 2 Meter panel 8 16 8 2 1 Function of hour meter 8 16 8 2 2 Function of tachometer 8 16 8 2 3 Function of fuel gauge 8 16 8 2 4 Function of coolant temperature gauge 8 16 8 3 Function of fuel level sensor 8 17 8 4 Function of coolant temperature sensor 8 17 8 5 Function of oil pressure switch 8 18 9 Others 8 19 9 1 El...

Page 16: ... setting switch knob at RIGHT position 8 40 4 11 7 Checking turn signal light switch continuity when setting switch knob at LEFT position 8 41 4 11 8 Checking hazard switch continuity when setting switch knob at OFF position 8 41 4 11 9 Checking hazard switch continuity when setting switch knob at ON position 8 42 4 11 10 Checking flasher unit connector voltage 8 42 4 11 11 Testing flasher unit ac...

Page 17: ...18BX RCK54 23BX and RCK60B 23BX 9 8 4 1 Assembling mower 9 8 4 2 Setting mower 9 8 4 3 Installing universal joint 9 9 4 4 Mounting rear link 9 9 4 5 Mounting front link 9 9 4 6 Mounting front link 9 10 5 Setting up mower RCK54D 26BX and RCK60D 26BX 9 10 5 1 Assembling mower 9 10 5 2 Setting mower 9 11 5 3 Mounting front link 9 11 5 4 Mounting frame link 9 12 5 5 Setting tractor 9 13 5 6 Mounting m...

Page 18: ...enter pulley holder 9 22 7 8 Removing outer pulley and blade shaft 9 23 7 9 Removing balancer 9 24 8 Servicing 9 25 8 1 Adjusting turning torque of pinion shaft 9 25 8 2 Adjusting backlash between bevel gears 9 25 xvi BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 19: ...1 INFORMATION KiSC issued 03 2019 A ...

Page 20: ...s situation which if not avoided will result in death or serious injury WARNING Indicates a potentially hazardous situation which if not avoided could result in death or serious injury CAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury IMPORTANT Indicates that equipment or property damage could result if instructions are not followed NOT...

Page 21: ...n disengaged positions Do not start the engine when you stay on the ground Start the engine only from operator s seat 4 Operate safely Do not use the machine after you consume alcohol or medication or when you are tired Put on applicable clothing and safety equipment Use applicable tools only Do not use alternative tools or parts When 2 or more persons do servicing make sure that you do it safely ...

Page 22: ...c shock The engine generates a high voltage of more than DC100 V in the ECU and is applied to the injector 5 Avoiding high pressure fluid Keep away from high pressure fluids bursting from a hose or pipe The fluid can penetrate your skin and cause serious injuries Get a medical aid immediately if the accident occurs 6 Avoiding hot exhaust Avoid skin exposure and contact with hot exhaust gas or comp...

Page 23: ...he work area If the engine is in operation make sure that the area has good airflow Do not operate the engine in a closed area The exhaust gas contains poisonous carbon monoxide 10 Discard fluids correctly Do not discard fluids on the ground down the drain into a stream pond or lake Obey related environmental protection regulations when you discard oil fuel coolant electrolyte and other dangerous ...

Page 24: ... fire extinguisher ready at all times Keep emergency numbers near your telephone at all times SAFETY FIRST 12 Preparing for emergencies 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 5 KiSC issued 03 2019 A ...

Page 25: ...1 INFORMATION SAFETY FIRST 1 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 26: ...ine If a label becomes damaged illegible or is not on the machine replace it The label part number is listed in the parts list SAFETY LABEL 1 Safety labels for BX tractor 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 7 KiSC issued 03 2019 A ...

Page 27: ...1 INFORMATION SAFETY LABEL 1 8 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 28: ...SAFETY LABEL 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 9 KiSC issued 03 2019 A ...

Page 29: ...1 INFORMATION SAFETY LABEL 1 10 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 30: ...SAFETY LABEL 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 11 KiSC issued 03 2019 A ...

Page 31: ...a label becomes damaged illegible or is not on the mower replace it The label part number is listed in the parts list 1 INFORMATION SAFETY LABEL 2 Safety labels for mower 1 12 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 32: ...SAFETY LABEL 2 Safety labels for mower 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 13 KiSC issued 03 2019 A ...

Page 33: ...with new labels If a component with danger warning and caution label s affixed is replaced with new part make sure new label s is are attached in the same location s as the replaced component Mount new danger warning and caution labels by applying on a clean dry surface and pressing any bubbles to outside edge 1 INFORMATION SAFETY LABEL 2 Safety labels for mower 1 14 BX1880 BX2380 BX2680 RCK60B 23...

Page 34: ...nk 25 L 6 6 U S gals 5 5 Imp gals Engine crankcase with filter 3 0 L 3 2 U S qts 2 6 Imp qts 3 3 L 3 5 U S qts 2 9 Imp qts 4 0 L 4 2 U S qts 3 5 Imp qts Engine coolant 2 9 L 3 1 U S qts 2 6 Imp qts 3 1 L 3 3 U S qts 2 7 Imp qts 3 3 L 3 5 U S qts 2 9 Imp qts Recovery tank 0 4 L 0 1 U S gals 0 09 Imp gals Transmission case 11 3 L 2 99 U S gals 2 49 Imp gals Dimensions Overall length without 3p 2120 ...

Page 35: ...egory 1 Max lift force 3 At lift points 5120 to 5390 N 1151 to 1213 lbf 24 in behind lift points 3040 N 680 lbf Remote control valve coupler Rear Option System 2 valves Coupler ISO 7241 1 series A Remote control valve coupler Front Option System 2 valves Coupler Fitting ISO 7241 1 series B PTO Rear PTO Type SAE 1 3 8 6 splines Revolution STD 540 min 1 rpm Mid PTO Type USA No 5 Kubota 10 tooth invo...

Page 36: ... lbs 75 kg 165 lbs Blade spindle speed 44 1 r s 2647 rpm 49 5 r s 2969 rpm 54 7 r s 3281 rpm Blade tip velocity 72 5 m s 14271 fpm 73 8 m s 14527 fpm 72 8 m s 14331 fpm Blade length 523 mm 20 6 in 475 mm 18 7 in 424 mm 16 7 in Number of blades 3 Dimensions Overall length 1000 mm 39 4 in 928 mm 36 5 in 895 mm 35 2 in Overall width 1930 mm 76 0 in 1780 mm 66 5 in 1544 mm 60 8 in Overall height Min 2...

Page 37: ...r s 2647 rpm 49 5 r s 2969 rpm Blade tip velocity 72 5 m s 14271 fpm 73 8 m s 14527 fpm Blade length 523 mm 20 6 in 475 mm 18 7 in Number of blades 3 Dimensions Overall length 1000 mm 39 4 in 928 mm 36 5 in Overall width 1930 mm 76 0 in 1780 mm 66 5 in Overall height Min 281 mm 11 0 in Tire Industrial turf 2 1 Remove the frame link when rear attachment is on Remove the frame link when snow attachm...

Page 38: ... km h 0 to 3 4 mph 0 to 6 0 km h 0 to 3 7 mph High 0 to 12 0 km h 0 to 7 5 mph 0 to 13 0 km h 0 to 8 1 mph Reverse Low 0 to 4 0 km h 0 to 2 5 mph 0 to 4 5 km h 0 to 2 8 mph High 0 to 9 0 km h 0 to 5 6 mph 0 to 10 0 km h 0 to 6 2 mph TRAVELING SPEEDS 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 19 KiSC issued 03 2019 A ...

Page 39: ...1 INFORMATION 1 20 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 40: ...DIMENSIONS DIMENSIONS 1 INFORMATION BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 1 21 KiSC issued 03 2019 A ...

Page 41: ...1 INFORMATION 1 22 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 42: ...2 GENERAL KiSC issued 03 2019 A ...

Page 43: ...ne serial number tractor serial number and hour meter reading 1 Tractor identification plate 2 Tractor serial number 3 ROPS identification plate 4 Engine serial number A BX1880 B BX2380 C BX2680 IDENTIFICATION 1 Tractor identification 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 1 KiSC issued 03 2019 A ...

Page 44: ...ing from the gear case side 2 Checking mower identification When contacting your local KUBOTA distributor always specify mower serial number 1 Mower serial number A RCK48 18BX RCK54 23BX and RCK60B 23BX B RCK54D 26BX and RCK60D 26BX 2 GENERAL IDENTIFICATION 1 Tractor identification 2 2 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 45: ...ection from which force 2 is applied When inserting spring pins their splits must face the direction from which a force is applied To prevent damage to the hydraulic system use specified fluid or equivalent Clean the parts before you measure them Tighten the fittings to the specified torque Too much torque can cause damage to the hydraulic units or the fittings Not sufficient torque can cause oil ...

Page 46: ...2 GENERAL 2 4 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 47: ...ical parts and wiring When removing the battery cables disconnect the negative cable first When installing the battery cables connect the positive cable first 1 Negative terminal 2 Positive terminal To ensure safety and prevent damage to the machine and surrounding equipment heed the following precautions in handling electrical parts and wiring HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ...

Page 48: ...2 GENERAL 2 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 49: ...r 15W 40 10 to 25 14 to 77 SAE20 SAE10W 30 or 15W 40 Below 10 14 SAE10W 30 4 Transmission case 11 3 L 2 99 U S gals 2 49 Imp gals KUBOTA SUPER UDT 2 fluid 2 5 Front axle case 3 6 L 3 8 U S qts 3 2 Imp qts KUBOTA SUPER UDT 2 fluid 2 or SAE 80 SAE90 gear oil 6 Greasing No of greasing points Capacity Type of grease Battery terminal 2 Moderate amount Multipurpose EP2 Grease NLGI Grade No 2 Speed contr...

Page 50: ...ification API classification Oil class of engines except external EGR Oil class of engines with external EGR Ultra Low Sulfur Fuel 0 0015 15 ppm CF CF 4 CG 4 CH 4 or CI 4 CF or CI 4 Class CF 4 CG 4 and CH 4 engine oils can not be used on EGR type engines EGR Exhaust gas re circulation The CJ 4 engine oil is intended for diesel particulate filter DPF type engines and cannot be used on this tractor ...

Page 51: ...on of the fuel Degradation of the fuel may cause corrosion of the fuel line or reduce the fuel filter flow earlier than expected BDF inherently absorbs moisture which may cause degradation of the fuel earlier than expected To avoid absorbing moisture of BDF drain the water separator and the fuel filter port often Do not use biodiesel whose concentrations higher than 20 for example greater than B20...

Page 52: ...quently operate the engine at least the following minutes to remove all of the biodiesel from the fuel lines Operating the engine 30 minutes Long term storage for B6 through B20 BDF easily deteriorates due to oxygen water heat and foreign substances Do not store B6 through B20 longer than one month When using B6 through B20 fuel and storing the machine longer than one months drain the fuel from th...

Page 53: ...o Place Capacity Type of grease 2 Universal joint Until grease overflows SAE multi purpose type grease NLGI 2 or NLGI 1 GC LB 3 Three spindle shafts 4 Belt tension pulley 5 Belt tension pivot 6 Balance shaft RCK60B 23BX only 7 Front and rear anti scalp roller LUBRICANTS FUEL AND COOLANT 2 Mower 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 11 KiSC issue...

Page 54: ...2 GENERAL LUBRICANTS FUEL AND COOLANT 2 Mower 2 12 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 55: ... 66 63 to 72 6 4 to 7 4 47 to 53 103 to 117 10 5 to 12 0 76 0 to 86 7 M14 108 to 125 11 0 to 12 8 79 6 to 92 5 124 to 147 12 6 to 15 0 91 2 to 108 167 to 196 17 0 to 20 0 123 to 144 M16 167 to 191 17 0 to 19 5 123 to 141 197 to 225 20 0 to 23 0 145 to 166 260 to 304 26 5 to 31 0 192 to 224 M18 246 to 284 25 0 to 29 0 181 to 209 275 to 318 28 0 to 32 5 203 to 235 344 to 402 35 0 to 41 0 254 to 296 ...

Page 56: ...8 48 to 56 4 9 to 5 7 36 to 41 61 to 73 6 3 to 7 4 45 to 53 1 2 110 to 130 11 3 to 13 2 81 2 to 95 8 150 to 178 15 3 to 18 1 111 to 131 9 16 150 to 178 15 3 to 18 1 111 to 131 217 to 260 22 2 to 26 5 160 to 191 5 8 204 to 244 20 8 to 24 8 151 to 179 299 to 357 30 5 to 36 4 221 to 263 5 Plugs Shape Size Material of opponent part Ordinariness Aluminum N m kgf m lbf ft N m kgf m lbf ft Tapered screw ...

Page 57: ... spring Adjust Every 100 Hr 2 30 14 Brake pedal Adjust Every 100 Hr 2 31 15 Toe in Adjust Every 200 Hr 2 33 16 Transmission fluid Change Every 400 Hr 2 34 1 17 Transmission strainer Clean Every 400 Hr 2 35 1 18 Front axle case oil Change Every 400 Hr 2 35 19 Front axle pivot Adjust Every 400 Hr 2 33 20 Engine valve clearance Adjust Every 800 Hr 2 36 21 Injection pressure of the fuel injection nozz...

Page 58: ...lation As the engine owner you are responsible for the performance of the required maintenance on the engine according to the preceding instruction Please see Warranty Statement in detail 1 The initial 50 hours should not be a replacement changing cycle B When the battery is used for less than 100 hours per year check the battery condition by reading the indicator annually 2 You should clean the a...

Page 59: ... 8 Greasing Universal joint Three spindle shafts Belt tension pulley Belt tension pivot Balance shaft 1 Front and rear anti scalp rollers Frame link 2 2 43 2 45 9 Gear box oil check 2 43 10 Gear box oil change 2 45 11 Gear box oil seal check 3 2 46 12 Gear box oil seal replace 2 46 IMPORTANT The jobs indicated by must be done after the first 50 hours of operation 1 RCK60B 23BX only 2 RCK60D 26BX a...

Page 60: ...2 GENERAL MAINTENANCE CHECK LIST 2 18 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 61: ... life of the machine make a thorough daily inspection before operating the machine or starting the engine 1 2 1 Walk around inspection Look around and under the tractor for such items as loose bolts trash build up oil or coolant leaks or broken or worn parts 1 2 2 Checking fuel gauge and refueling WARNING To avoid serious injury or death Do not smoke while refueling Be sure to stop the engine and ...

Page 62: ...t clean replace it and draw it out again 4 Check to see that the engine oil level lies between the two notches 5 If the engine oil level is too low add new oil to the prescribed level at the oil inlet BX1880 and BX2380 BX2680 1 Oil inlet 2 Dipstick A Engine oil level is acceptable within this range RELATED PAGE 1 1 Lubricants fuel and coolant on page 2 7 1 2 4 Checking transmission fluid level WAR...

Page 63: ... is between the H and L marks of the recovery tank 2 When the coolant level drops due to evaporation add soft water only In case of leakage add antifreeze and soft water in the specified mixing ratio up to the H level 1 Recovery tank A H B L RELATED PAGE 1 1 Lubricants fuel and coolant on page 2 7 1 2 6 Cleaning panel and radiator screen WARNING To avoid serious injury or death Be sure to stop the...

Page 64: ...ircuits Leakage of electricity could result in a fire hazard a dead battery or damage to the electrical components Replace the damaged wires or connections promptly If a fuse blows soon after replacement do not use the capacity larger than recommended or bypass the fuse system Many wiring connections are protected by waterproof plugs Plug and unplug these connections carefully and make sure that t...

Page 65: ...e oil completely into the oil pan 2 After draining of the used engine oil reinstall the drain plug 3 Fill the engine with the new engine oil up to the upper notch on the dipstick 4 Properly dispose of the used engine oil BX1880 and BX2380 BX2680 BX1880 BX2380 and BX2680 1 Oil inlet 2 Dipstick 3 Drain plug A Oil level is acceptable within this range RELATED PAGE 1 1 Lubricants fuel and coolant on p...

Page 66: ...r 1 Remove the transmission oil filter 2 Put a film of clean transmission oil on rubber seal of new transmission oil filter 3 Tighten the transmission oil filter quickly until it contacts the mounting surface 4 Tighten the transmission oil filter by hand an additional 1 2 turn only 5 After the new transmission oil filter has been replaced the transmission fluid level will decrease a little Make su...

Page 67: ... Speed control pedal 2 Battery terminals 3 Rear link 4 Bonnet guide rod A Figure A B Figure B C Figure C D Figure D CHECK AND MAINTENANCE 1 Periodic service 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 25 KiSC issued 03 2019 A ...

Page 68: ... lever Hi Lo 2 PTO clutch lever 3 Speed control pedal 1 4 3 Checking operator presence control OPC system WARNING To avoid serious injury or death Do not allow anyone near the tractor while testing If the tractor does not pass the test do not operate the tractor Preparation before testing 1 Sit on the operator s seat 2 Set the parking brake and stop the engine 3 Shift the range gear shift lever to...

Page 69: ...arts may prematurely deteriorate which may shorten the battery s service life or cause an explosion Check the fluid level regularly and add distilled water as required so that the fluid level is between the UPPER and LOWER levels DANGER To avoid serious injury or death When the battery is being activated hydrogen and oxygen gases in the battery are extremely explosive Keep open sparks and flames a...

Page 70: ...void serious injury or death When disconnecting the cable from the battery start with the negative terminal first When connecting the cable to the battery start with the positive terminal first Never check battery charge by placing a metal object across the posts Use a voltmeter or hydrometer 1 Battery 2 Clamp 1 To slow charge the battery connect the battery positive terminal to the charger positi...

Page 71: ...ot Refer to the instructions on the label attached to the case BX1880 and BX2380 BX2680 1 Element 2 Cover 3 Evacuator valve 1 5 3 Checking fuel filter WARNING To avoid serious injury or death Stop the engine and remove the key before checking the fuel lines and the fuel filter Check the fuel lines periodically The fuel lines are subject to wear and aging Fuel may leak out onto the running engine c...

Page 72: ... foot off speed control pedal If tractor moves on level ground with foot off the pedal or if the pedal is too slow in returning to neutral position when removing the foot from the pedal adjust the HST neutral spring The HST neutral spring located under the front right side of the fender can adjust returning speed of speed control pedal Since the HST neutral spring tension is weakened the HST tensi...

Page 73: ...e wheels before checking the brake pedal Even if free travel of the brake pedal is within the limitation adjust the brake pedal 1 Release the parking brake 2 Loosen the lock nut and turn the turnbuckle to adjust the rod length so that the brake free travel is 10 mm 0 4 in 3 Extend the turnbuckle one additional turn 4 Retighten the lock nut 5 Depress the brake pedal several times and make sure that...

Page 74: ...p the engine and remove the key before changing the oil Oil can be hot and can burn Allow the engine to cool down sufficiently BX1880 Engine oil with fil ter Capacity 3 0 L 3 2 U S qts BX2380 Engine oil with fil ter Capacity 3 3 L 3 5 U S qts BX2680 Engine oil with fil ter Capacity 4 0 L 4 2 U S qts 1 To drain the used engine oil remove the drain plug at the bottom of the engine and drain the engi...

Page 75: ... and level place Lower the implement to the ground and apply the parking brake Stop the engine and remove the key Checking toe in 1 Turn the steering wheel so that the front wheels are in the straight ahead position 2 Measure the distance between the tire beads at front of the tires and at the hub heights 3 Measure the distance between the tire beads at rear of the tires and at the hub heights 4 F...

Page 76: ...ter draining the transmission fluid reinstall the drain plug 3 Clean the transmission strainer 4 Fill with new transmission fluid up to the upper notch on the dipstick 2 Oil inlet 3 Dipstick A Transmission fluid level is acceptable within this range Transmission fluid Capacity 11 3 L 2 99 U S gals 2 49 Imp gals 5 After operating the engine for a few minutes stop it and check the transmission fluid...

Page 77: ...ick 3 Drain plug A Front axle case oil level is acceptable within this range 3 Drain the front axle case oil completely into the oil pan 4 After draining the front axle case oil reinstall the drain plugs 5 Remove the right and left breather plugs 6 Fill with new front axle case oil up to the upper notch on the dipstick Front axle case oil Capacity 4 7 L 5 0 U S qts 4 1 Imp qts IMPORTANT After 10 m...

Page 78: ...lant is hot When the coolant is cool slowly rotate the radiator cap to the first stop and allow sufficient time for excess pressure to escape before removing the radiator cap completely IMPORTANT Do not start the engine without coolant Use clean fresh soft water and the anti freeze to fill the radiator and the recovery tank When mixing the anti freeze with water the anti freeze mixing ratio is 50 ...

Page 79: ...dical help Do not make a person throw up unless told to throw up by poison control center or a health care professional Use standard first aid and CPR for signs of shock or cardiac arrest Call your local poison control center or your local emergency number for further assistance When the antifreeze comes in contact with the skin or clothing wash it off immediately Do not mix different types of the...

Page 80: ...ervice life of two years Be sure to change the coolant every two years The procedure for the mixing of water and the antifreeze differs according to the make of the antifreeze and the ambient temperature Refer to SAE J1034 standard more specifically also to SAE J814c Antifreeze Freezing point Boiling point 1 50 Vol 37 34 108 226 1 At 1 013 105 Pa 760 mmHg atmospheric pressure A higher boiling poin...

Page 81: ...ecking fuel lines WARNING To avoid serious injury or death Stop the engine and remove the key before checking the fuel lines and fuel filter Check the fuel lines periodically The fuel lines are subject to wear and aging Fuel may leak out onto the running engine causing a fire IMPORTANT When the fuel line is disconnected for maintenance or repair plug both ends of the fuel line with a clean plug of...

Page 82: ... hose clamps securely 1 Radiator hoses 2 pcs 2 Hose clamps 4 pcs 1 14 2 Replacing fuel hose See Checking fuel lines RELATED PAGE 1 13 4 Checking fuel lines on page 2 39 1 14 3 Replacing power steering hose See Checking power steering line RELATED PAGE 1 13 3 Checking power steering line on page 2 39 1 14 4 Replacing intake air line See Checking intake air line RELATED PAGE 1 13 1 Checking intake a...

Page 83: ...load or short somewhere in the electrical system 1 If any of the fuses should blow replace with a new fuse with the same capacity IMPORTANT Before replacing a blown fuse determine why the fuse blew and make any necessary repairs Failure to follow this procedure may result in serious damage to the electrical system of the tractor 1 Fuse box 2 Slow blow fuse Protected circuit Fuse box Fuse No Capaci...

Page 84: ...D 26BX Tightening tor que Mower blade screw 102 9 to 117 6 N m 10 5 to 12 0 kgf m 75 9 to 86 8 lbf ft 4 If the mower blade screw 2 is worn or broken replace it 2 1 2 Checking mower blade WARNING To avoid serious injury or death Be sure to stop the engine and remove the key Blades may be sharp When you handle blades wear heavy gloves or wrap end of blade with a rag IMPORTANT Use the proper metric s...

Page 85: ... level ground 2 Loosen the check plug 1 and check to see if oil seems from the opening 3 If the oil level is low remove the oil filler plug 2 and add new gear oil RELATED PAGE 2 1 Lubricants on page 2 11 2 1 5 Greasing spindle shafts belt tension pivot and tension pulley 1 Grease the grease fittings 1 2 of the spindle shafts if the amount of grease is insufficient CHECK AND MAINTENANCE 2 Mower 2 G...

Page 86: ...2 Grease fitting Belt tension pulley 3 Grease fitting Belt tension pivot 4 Clevis pin 5 Ramp bracket 6 Pin A Rear B Up A RCK60B 23BX and RCK54 23BX B RCK60D 26BX and RCK54P 26BX 2 1 6 Greasing balance shaft RCK60B 23BX 1 Grease the grease fitting 1 of the balance shaft if the amount of grease is insufficient 1 Grease fitting 2 GENERAL CHECK AND MAINTENANCE 2 Mower 2 44 BX1880 BX2380 BX2680 RCK60B ...

Page 87: ...universal joint if the amount of grease is insufficient 1 Spline 2 Grease fitting RCK60D 26BX and RCK54D 26BX only 2 Grease between the hole and rod 3 3 Hole and rod 2 2 Check points of initial 50 hours 2 2 1 Changing gear box oil CAUTION Be sure to stop the engine and remove the key before changing the oil IMPORTANT Use the specified gear oil 1 Dismount the mower from the tractor and place the mo...

Page 88: ...il 1 See Changing gear box oil in Check points of initial 50 hours RELATED PAGE 2 2 1 Changing gear box oil on page 2 45 2 4 Check points of every 1 year 2 4 1 Checking gear box oil seal 1 Check the gear box oil seals 1 2 for leaks If oil seals are leaking replace them 1 Oil seal 2 Oil seal 2 5 Check point of every 4 years 2 5 1 Replacing gear box oil seal 1 Replace the gear box oil seals 1 2 with...

Page 89: ...24 12 00 12 Bar 120 kPa 1 2 kgf cm2 17 psi Front 16 7 50 8 Turf 120 kPa 1 2 kgf cm2 17 psi 16 7 50 8 Bar 230 kPa 2 3 kgf cm2 34 psi BX2380 and BX2680 Tire sizes Inflation pressure Rear 26 12 00 12 Turf 100 kPa 1 0 kgf cm2 14 psi 26 12 00 12 Bar 120 kPa 1 2 kgf cm2 17 psi 26 12 00 12 Ind 120 kPa 1 2 kgf cm2 17 psi Front 18 8 50 10 Turf 120 kPa 1 2 kgf cm2 17 psi 18 8 50 10 Bar 150 kPa 1 5 kgf cm2 2...

Page 90: ...read Models BX1880 BX2380 and BX2680 Tire 16 7 50 8 Turf 16 7 50 8 Bar 18 8 50 10 Turf 18 8 50 10 Bar 18 8 50 10 Ind Tread A 930 mm 36 6 in How to jack up the front axle WARNING To avoid serious injury or death Before jacking up the tractor park it on a firm and level ground and chock the rear wheels Fix the front axle to keep it from pivoting Select jacks that withstand the machine weight and set...

Page 91: ...in steering control and prevent tip over Remove weight when no longer needed Front end weights option The front end weights can be attached to the bumper See your implement operator s manual for required number of weights NOTE Besides the weight a front weight bracket and mounting bolt kit s are required for mounting the weight 1 Front end weights option 2 Front weight bracket option 3 2 Rear ball...

Page 92: ...r or solution more than the correct percentage of full capacity as shown in the following table to the level of valve stem at 12 o clock position 1 Air 2 Water 3 Valve stem A Correct B Incorrect Correct Incorrect Amount of water 75 of full capacity of tire 100 of full capacity of tire Characteristic Air compresses like a cushion Water cannot be compressed To avoid damage of the transmission do not...

Page 93: ... the form of 3 point counter weight and the rear wheel ballast The amount of the rear ballast will depend on the application Implement as counter weight Box blade Approx 190 kg 420 lbs Rear blade Rotary tiller Ballast box IMPLEMENT LIMITATIONS 1 Weight of implements as rear ballast 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 51 KiSC issued 03 2019 A ...

Page 94: ...k Max hitch load W2 The max loading weight for hitching Trailer loading weight W3 The max loading weight for trailer without trailer s weight Total weight W4 The max loading weight for trailer with trailer s weight NOTE Implement size may vary depending on soil operating conditions Strictly follow the instructions outlined in the operator s manual of the mounted or trailed machinery or trailer and...

Page 95: ...n Sub frame Necessary Necessary Rear blade Max cutting width 152 cm 60 in 152 cm 60 in Max weight 112 kg 248 lbs 112 kg 248 lbs Front loader Max lifting capacity Bucket pivot pin max height 335 kg 739 lbs 1 335 kg 739 lbs 1 Max width 122 cm 48 in 122 cm 48 in Box blade Max cutting width 152 cm 60 in 152 cm 60 in Max weight 170 kg 375 lbs 170 kg 375 lbs Snow blower Front Max working width 127 cm 50...

Page 96: ...2 GENERAL IMPLEMENT LIMITATIONS 2 54 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 97: ...aptor J Code No 07909 30208 Assembly 07909 30934 A to F 07909 31211 E and F 07909 31231 H 07909 31251 G 07909 31271 I 07909 31281 J 1 3 Nozzle tester Use to check the fuel injection pressure and spray pattern of nozzle Code No 07909 31361 Measuring range 0 to 50 MPa 0 to 500 kgf cm2 0 to 7200 psi 1 4 Injection pump pressure tester Use for checking fuel tightness of injection pumps NOTE Since the s...

Page 98: ...to 0 244 in dia N 8 0 mm 0 31 in O 4 0 mm 0 16 in P 11 97 to 11 99 mm dia 0 4713 to 0 4720 in dia Q PF 1 2 R 23 mm 0 91 in S 17 mm 0 67 in T 4 0 mm 0 16 in U 12 00 to 12 02 mm dia 0 4725 to 0 4732 in dia V 100 mm 3 94 in W M12 P1 5 X 5 0 mm 0 20 in 1 5 Valve guide replacing tool Use to press out and press fit the valve guide NOTE The special tools are not provided so make them referring to the fig...

Page 99: ...n D 20 mm dia 0 79 in dia E 11 7 to 11 9 mm dia 0 461 to 0 468 in dia F 6 50 to 6 60 mm dia 0 256 to 0 259 in dia G 25 mm dia 0 98 in dia H 6 70 to 7 00 mm dia 0 264 to 0 275 in dia I 5 0 mm 0 20 in J 20 mm dia 0 79 in dia K 12 5 to 12 8 mm dia 0 493 to 0 503 in dia L 8 90 to 9 10 mm 0 351 to 0 358 in C1 Chamfer 1 0 mm 0 039 in C2 Chamfer 2 0 mm 0 079 in C0 3 Chamfer 0 3 mm 0 012 in 1 6 Bushing re...

Page 100: ...pecial tools are not provided so make them referring to the figure For small end bushing A 157 mm 6 18 in B 24 mm 0 94 in C 120 mm 4 72 in D 21 8 to 21 9 mm dia 0 859 to 0 862 in dia E 24 8 to 24 9 mm dia 0 977 to 0 980 in dia F 20 mm dia 0 79 in dia a 6 3 μm 250 μin b 6 3 μm 250 μin C1 Chamfer 1 0 mm 0 039 in C2 Chamfer 2 0 mm 0 0079 in For idle gear bushing A 196 mm 7 72 in B 26 mm 1 0 in C 150 ...

Page 101: ...1 863 to 1 870 in dia C1 Chamfer 1 0 mm 0 039 in C2 Chamfer 2 0 mm 0 079 in C0 3 Chamfer 0 30 mm 0 012 in Press fit D902 E4 D1005 E4 A 130 mm 5 12 in B 72 mm 2 83 in C 40 mm radius 1 6 in radius D 9 0 mm 0 35 in E 24 mm 0 94 in F 20 mm dia 0 79 in dia G 68 mm dia 2 7 in dia H 43 90 to 43 95 mm dia 1 729 to 1 730 in dia 47 30 to 47 50 mm dia 1 863 to 1 870 in dia C1 Chamfer 1 0 mm 0 039 in C2 Chamf...

Page 102: ... 2 Independent PTO clutch spring compression tool Use for compressing the spring into the spline boss B30 series BX50 series BX60 series BX24 BX25 tractor A 12 mm 0 47 in B 25 4 mm 1 00 in C 19 mm radius 0 75 in Hex D 2 7 mm 0 11 in E 8 mm 0 31 in F 15 mm dia 0 59 in dia G 37 mm 1 46 in H 70 mm 2 76 in I M14 1 5 J R 3 mm 0 12 in K 30 mm 1 18 in L 17 mm 0 67 in M 38 mm 1 50 in 2 GENERAL SPECIAL TOO...

Page 103: ...to 60 5 mm 2 35 to 2 38 in G 92 5 to 93 5 mm 3 65 to 3 68 in H 12 5 to 13 5 mm 0 50 to 0 53 in I 55 mm 2 17 in J 20 mm 0 79 in K 17 mm 0 67 in L 30 5 to 31 5 mm 1 21 to 1 24 in M 226 mm 8 90 in N 125 5 to 126 5 mm 4 95 to 4 98 in O 352 mm 13 86 in P 25 mm 0 98 in Q 9 5 mm 0 37 in Continued SPECIAL TOOLS 2 Special tools for tractor 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RC...

Page 104: ... 46 mm 1 81 in T R25 mm 0 98 in U 11 mm 0 43 in W 20 mm 0 79 in 2 GENERAL SPECIAL TOOLS 2 Special tools for tractor 2 62 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 105: ...311 mm 12 24 in B 40 mm 1 57 in C 38 1 mm 1 50 in D 235 mm 9 25 in E 170 mm 6 69 in F 9 5 mm 0 37 in G 6 4 mm 0 25 in H 365 mm 14 37 in I 377 8 mm 14 87 in Continued SPECIAL TOOLS 2 Special tools for tractor 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 63 KiSC issued 03 2019 A ...

Page 106: ... ϕ0 35 in 3 holes Q 25 mm 0 98 in R 39 5 to 40 5 mm 1 56 to 1 59 in S 140 mm 5 51 in T 260 mm 10 24 in U 99 5 to 100 5 mm 3 92 to 3 95 in V 45 mm 1 77 in 2 GENERAL SPECIAL TOOLS 2 Special tools for tractor 2 64 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 107: ... 30 E 50 mm dia 1 969 in dia F 10 mm dia 0 394 in dia G 9 1 to 9 3 mm dia 0 359 to 0 366 in dia H 34 mm dia 1 336 in dia I M36 1 5 mm pitch J 10 mm 0 394 in K 16 mm 0 630 in L 41 mm 1 614 in Continued SPECIAL TOOLS 2 Special tools for tractor 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 2 65 KiSC issued 03 2019 A ...

Page 108: ...5 mm dia 1 358 in dia Y 38 mm dia 1 496 in dia Z 25 mm 0 984 in a 1 05 rad 10 b Chamfer 0 3 mm 0 012 in c 23 mm 0 906 in d 10 mm 0 394 in e 1 mm 0 039 in f 6 5 mm 0 256 in g Chamfer 0 5 mm 0 020 in h 11 1 to 11 3 mm 0 437 to 0 445 in i 18 8 to 19 0 mm 0 740 to 0 748 in 1 Spacer 2 Block 3 Cap 2 GENERAL SPECIAL TOOLS 2 Special tools for tractor 2 66 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 ...

Page 109: ...m dia 1 166 in dia E 13 6 mm 0 535 in F 11 8 mm 0 465 in G 0 48 to 0 57 rad 27 to 33 H 2 5 mm 0 098 in radius I 5 36 to 5 56 mm 0 211 to 0 219 in J 3 8 mm 0 15 in radius K 19 0 mm 0 748 in L 7 98 mm 0 314 in M 5 08 mm 0 200 in N 3 79 to 3 93 mm 0 149 to 0 155 in O 1 0 mm 0 040 in radius Continued SPECIAL TOOLS 2 Special tools for tractor 2 GENERAL BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 ...

Page 110: ...33 0 mm 1 300 in T 0 51 mm 0 020 in chamfer U 25 3 mm dia 0 997 in dia V 1 6 mm 0 063 in radius W 22 3 to 22 4 mm 0 8780 to 0 8830 in 2 GENERAL SPECIAL TOOLS 2 Special tools for tractor 2 68 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 111: ...3 ENGINE KiSC issued 03 2019 A ...

Page 112: ...se 2 Cylinder head cover 3 Breather valve 4 Oil shield 5 Rubber packing After its oil content is filtered by oil shield 4 the blow by gas in fed back to the intake manifold through breather valve 3 to be used for re combustion 1 3 Function of half floating head cover The half floating head cover helps reduce noise coming from the cylinder head 1 Cylinder head cover 2 Rubber packing Rubber packing ...

Page 113: ...are split for easy assembly on the piston The piston rings are usually made of hardened cast iron To reduce the wear on the ring they are often plated with chrome on their contact faces or are coated their contact faces with molybdenum disulfide The top compression ring 1 is a keystone type ring to get durability against heavy load The second compression ring 2 is an undercut ring to prevent short...

Page 114: ...s are force lubricated 1 9 Function of rocker arm The rocker arm is an oscillating lever that conveys radial movement from the camshaft lobes into linear movement at the exhaust and intake valves to open and close them 1 Rocker arm shaft 2 Rocker arm 3 Exhaust valve 4 Intake valve 5 Adjusting screw 6 Push rod The rocker arms 2 are mounted on a rocker arm shaft a single hollow shaft 1 at the top of...

Page 115: ...ransmit torque from the crankshaft to the oil pump and injection pump and at the same time correctly control fuel injection to the cylinders and valve timing Each gear has a mating mark inscribed on it for correct and easy assembly and is spherical with teeth set obliquely to the axis of rotation to rotate smoothly and reduce noise The crankshaft is the hub around which other parts of the engine c...

Page 116: ...ief valve 10 Push rod 11 Tappet 12 Camshaft 13 Piston 14 Connecting rod 15 Oil filter cartridge This engine s lubricating system consists of oil strainer 8 oil pump 7 relief valve 9 oil filter cartridge 15 and oil pressure switch 2 MECHANISM 2 Lubricating system 3 ENGINE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 3 5 KiSC issued 03 2019 A ...

Page 117: ...aft 12 and rocker arm shaft 3 to lubricate each part Some part of oil splashed by the crankshaft or leaking and dropping from gaps of each part lubricates these parts piston 13 cylinders small ends or connecting rods tappets 11 push rods 10 inlet and exhaust valves 4 and timing gears 3 ENGINE MECHANISM 2 Lubricating system 3 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK5...

Page 118: ...otor 2 in the same direction The inner rotor 1 has one less lobe than the outer rotor 2 and they are eccentrically engaged with each other 2 4 Function of oil filter The oil filter is responsible for filtering impurities from the oil 1 Filter element 2 Bypass valve a Filtered oil b Unfiltered oil A Bypass valve closed B Bypass valve open In the filtration system there is only one oil flow from the...

Page 119: ...l switch body A At proper oil pressure B At lower oil pressure The oil pressure switch is mounted on the cylinder block and is led to the lubricating oil passage When the oil pressure falls below the specified value the oil pressure warning lamp lights A At the proper oil pressure When the engine is started and as the proper oil pressure builds the diaphragm 4 is pushed up This separates the conta...

Page 120: ...erature the thermostat valve is closed so that the coolant is circulated in the engine through the bypass pipe When the temperature of the coolant becomes the valve opening temperature of the thermostat 4 the thermostat 4 opens the valve to return the heated coolant to the radiator 1 The water pump 2 circulates the cooled coolant into the cylinder block 6 and draws out the hot coolant through the ...

Page 121: ...2 Water pump 3 Cooling fan 4 Thermostat 5 Cylinder head 6 Cylinder block 3 ENGINE MECHANISM 3 Cooling system 3 10 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 122: ...ors are usually made of copper or brass Recently however aluminum made radiators are introduced for their light weight 3 4 Function of radiator cap The radiator cap keeps coolant from boiling out or evaporating 1 Overflow tube 2 Pressure valve 3 Vacuum valve A Pressure valve open B Vacuum valve open The pressure system permits operating the engine at a higher temperature without boiling the coolan...

Page 123: ...m the fuel a Fuel in b Fuel out c Filtered fuel d Unfiltered fuel In line filter is installed in the fuel line with an electromagnetic fuel feed pump and is used to filter impurities such as dirt water etc 4 3 Function of fuel feed pump An electromagnetic fuel feed pump is used when a fuel tank is set below the pump of the engine a Fuel in b Fuel out An electromagnetic fuel feed pump uses a transi...

Page 124: ...vent the rapid increase in the injection quantity when the initial injection turns into the full force injection Also employed to prevent the injection quantity loss in the throttle section caused by carbon the flat cut provided at the needle valve section helps the throttle withstand long use and reduce as much knocking sound as when it was new The heat seal 9 is employed to improve the durabilit...

Page 125: ...3 ENGINE MECHANISM 4 Fuel system 3 14 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 126: ...place 3 43 12 Injection pump malfunction ing Repair or replace 3 49 13 Seizure of crankshaft cam shaft piston cylinder or bearing Repair or replace 3 51 3 54 14 Compression leak from cylin der Replace head gasket tighten cylinder head screw glow plug and nozzle holder 3 30 3 45 15 Improper valve timing Correct or replace timing gear 3 50 16 Piston ring and cylinder worn Replace 3 52 17 Excessive v...

Page 127: ...d fuel 2 7 3 Fuel filter clogged Replace 2 29 4 Air cleaner clogged Clean or replace 2 28 5 Deficient nozzle injection Repair or replace nozzle 3 44 Deficient output 1 Incorrect injection timing Adjust 3 34 2 Engine s moving parts seem to be seizing Repair or replace 3 Injection pump malfunctioning Repair or replace 3 49 4 Deficient nozzle injection Repair or replace nozzle 3 44 5 Air cleaner dirt...

Page 128: ...e oil clearance of crankpin bearing Replace 3 54 3 70 7 Excessive oil clearance of rocker arm Replace 3 45 3 61 8 Oil passage clogged Clean 9 Different type of oil Use specified type of oil 2 7 10 Oil pump damaged Replace 3 48 11 Oil filter clogged Replace 2 23 High oil pressure 1 Different type of oil Use specified type of oil 2 7 2 Relief valve damaged Replace 3 31 3 78 Engine overheated 1 Engin...

Page 129: ...ickly discharged 1 Battery electrolyte insufficient Fill distilled water and charge 2 27 2 Fan belt slips Adjust belt tension or replace 3 32 3 Wiring disconnected Connect 4 Rectifier damaged Replace 8 49 5 Alternator damaged Replace 8 48 6 Battery damaged Replace 3 ENGINE SERVICING 3 18 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 130: ...0039 protrusion to 0 0039 re cessing in 0 30 recessing mm 0 012 recessing in Valve stem to valve guide Clearance 0 030 to 0 057 mm 0 0012 to 0 0022 in 0 10 mm 0 0039 in Valve stem O D 5 968 to 5 980 mm 0 2350 to 0 2354 in Valve guide I D 6 010 to 6 025 mm 0 2367 to 0 2372 in Valve clearance Cold 0 145 to 0 185 mm 0 00571 to 0 00728 in Valve spring Free length 31 3 to 31 8 mm 1 24 to 1 25 in 28 4 m...

Page 131: ...dle gear 1 to cam gear Backlash 0 0470 to 0 123 mm 0 00185 to 0 00484 in 0 15 mm 0 0059 in Idle gear 1 injection pump gear Backlash 0 0460 to 0 124 mm 0 00182 to 0 00488 in 0 15 mm 0 0059 in Crank gear to oil pump drive gear Backlash 0 0410 to 0 123 mm 0 00162 to 0 00484 in 0 15 mm 0 0059 in Idle gear shaft to gear bushing Idle gear 1 Clearance 0 020 to 0 084 mm 0 00079 to 0 0033 in 0 10 mm 0 0039...

Page 132: ...134 to 0 00448 in 0 20 mm 0 0079 in Crankshaft O D 39 934 to 43 950 mm 1 5722 to 1 5728 in Crankshaft bearing 1 I D 39 984 to 44 040 mm 1 5742 to 1 5763 in Crankshaft to crankshaft bearing 1 BX2380 D902 E4 Oil clearance 0 0340 to 0 106 mm 0 00134 to 0 00417 in 0 20 mm 0 0079 in Crankshaft O D 43 934 to 43 950 mm 1 7297 to 1 7303 in Crankshaft bearing 1 I D 43 984 to 44 040 mm 1 7317 to 1 7338 in C...

Page 133: ...tion Allowable limit Engine oil pressure At idle speed More than 49 kPa 0 50 kgf cm2 7 1 psi At rated speed 197 to 441 kPa 2 0 to 4 50 kgf cm2 28 5 to 64 0 psi 147 kPa 1 50 kgf cm2 21 3 psi Inner rotor to outer rotor Clearance 0 030 to 0 14 mm 0 0012 to 0 0055 in Outer rotor to pump body Clearance 0 070 to 0 15 mm 0 0028 to 0 0059 in Inner rotor to cover Clearance 0 0750 to 0 135 mm 0 00296 to 0 0...

Page 134: ...dy Item Factory specification Allowable limit Cylinder head surface Flatness 0 005 mm 0 002 in Top clearance 0 55 to 0 70 mm 0 022 to 0 029 in Compression pressure 3 73 to 4 11 MPa 38 0 to 42 0 kgf cm2 541 to 597 psi 2 26 MPa 23 0 kgf cm2 370 psi327 psi Variance among cylinders 10 or less Valve seat Angle Intake 1 0 rad 60 Angle Exhaust 0 79 rad 45 Width 2 12 mm 0 0835 in Valve face Angle Intake 1...

Page 135: ...0 mm 0 012 in Alignment 0 01 mm 0 0004 in Cam height Intake 28 80 mm 1 134 in 28 75 mm 1 132 in Exhaust 29 00 mm 1 142 in 28 95 mm 1 140 in Camshaft journal to cylinder block bore Oil clearance 0 050 to 0 091 mm 0 0020 to 0 0035 in 0 15 mm 0 0059 in Camshaft journal O D 35 934 to 35 950 mm 1 4148 to 1 4153 in Camshaft block bore I D 36 000 to 36 025 mm 1 4174 to 1 4183 in Timing gear Crank gear to...

Page 136: ...0059 in Piston pin O D 22 002 to 22 011 mm 0 86622 to 0 86657 in Small end bushing I D 22 025 to 22 040 mm 0 86713 to 0 86771 in Crankshaft Side clearance 0 15 to 0 31 mm 0 0059 to 0 012 in 0 50 mm 0 020 in Alignment 0 02 mm 0 0008 in Crankshaft to crankshaft bearing 1 Oil clearance 0 0340 to 0 114 mm 0 00134 to 0 00448 in 0 20 mm 0 0079 in Crankshaft O D 47 934 to 47 950 mm 1 8872 to 1 8877 in Cr...

Page 137: ...pump body Clearance 0 100 to 0 180 mm 0 00394 to 0 00708 in Inner rotor to cover Clearance 0 025 to 0 075 mm 0 00099 to 0 0029 in Relief valve spring Length 32 mm 1 26 in 28 mm 1 10 in Cooling system Item Factory specification Allowable limit Thermostat Valve opening temperature at be ginning 69 5 to 72 5 157 1 to 162 5 Valve opening temperature opened completely 85 185 Radiator Water leakage test...

Page 138: ...cm2 1991 1849 psi Injection nozzle Injection pressure 13 73 to 12 75 MPa 140 0 to 150 0 kgf cm2 1991 to 2133 psi Injection nozzle valve seat Valve seat tightness When the pressure is 12 75 MPa 130 0 kgf cm2 1849 psi the valve seat must be fuel tightness SERVICING 3 ENGINE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 3 27 KiSC issued 03 2019 A ...

Page 139: ... 1 20 to 22 Rocker arm bracket screw M6 1 0 9 81 to 11 2 1 00 to 1 15 7 24 to 8 31 Fan drive pulley screw M12 1 5 118 to 127 12 0 to 13 0 86 8 to 94 0 Bearing case cover mounting screw M6 1 0 9 81 to 11 2 1 00 to 1 15 7 24 to 8 31 Glow plug M8 1 0 7 9 to 14 0 80 to 1 5 5 8 to 10 Nozzle holder assembly M20 1 5 49 to 68 5 0 to 7 0 37 to 50 Nozzle holder 35 to 39 3 5 to 4 0 26 to 28 Oil pressure swit...

Page 140: ...5 0 to 7 0 37 to 50 Nozzle holder 35 to 39 3 5 to 4 0 26 to 28 Oil pressure switch PT 1 8 15 to 19 1 5 to 2 0 11 to 14 Injection pipe retaining nut M12 1 5 25 to 34 2 5 to 3 5 18 to 25 Overflow pipe retaining nut M12 1 5 20 to 24 2 0 to 2 5 15 to 18 Drain plug with copper gasket M12 1 25 33 to 37 3 3 to 3 8 24 to 27 Oil filter joint 40 to 49 4 0 to 5 0 29 to 36 RELATED PAGE TIGHTENING TORQUES on p...

Page 141: ...ain BX1880 D722 E4 Compression pres sure Factory specifi cation 2 85 to 3 23 MPa 29 0 to 33 0 kgf cm2 413 to 469 psi Allowable limit 2 26 MPa 33 0 kgf cm2 327 psi BX2380 D902 E4 Compression pres sure Factory specifi cation 3 53 to 4 02 MPa 36 0 to 41 0 kgf cm2 512 to 583 psi Allowable limit 2 55 MPa 26 0 kgf cm2 370 psi BX2680 D1005 E4 Compression pres sure Factory specifi cation 3 73 to 4 11 MPa ...

Page 142: ...rew Intake and exhaust valve clearance Cold Factory specifi cation 0 145 to 0 185 mm 0 00571 to 0 00728 in 5 Then turn the flywheel 6 28 rad 360 and align the 1TC mark at 1TC and timing line 1 on the flywheel and alignment mark 2 on the rear end plate so that the No 1 piston comes to the overlap position 6 Check the following valve clearance marked with using a feeler gauge 7 If the clearance is n...

Page 143: ...he belt halfway between the fan drive pulley and alternator pulley at specified force A Deflection 2 If the measurement is not within the factory specifications loosen the alternator mounting screws and relocate the alternator to adjust Depressing fan belt Specified force 98 N 10 kgf 22 lbf Deflection A Factory specifi cation 7 0 to 9 0 mm 0 28 to 0 35 in 4 3 2 Checking fan belt damage and wear 1 ...

Page 144: ...tester 1 and an adaptor 2 and raise the water pressure to the specified pressure 1 Radiator tester 2 Adapter Radiator water leakage test pres sure Factory specifi cation No leak at specified pres sure 3 Check the radiator for water leaks 4 For water leak from the pinhole repair with the radiator cement When water leak is excessive replace the radiator 4 3 5 Checking thermostat valve opening temper...

Page 145: ...pprox 0 009 rad 0 5 In disassembling and replacing the injection pump be sure to use the same number of new shims with the same thickness The 0 175 mm thick shim is coated only on the lower face Therefore do not use the 0 175 mm thick shim as the top shim of the combination injection pump side because this can cause oil leakage 1 1TC and timing line 2 Alignment mark 4 Shim Soft metal gasket shim 5...

Page 146: ...ump element NOTE Never try to disassemble the injection pump assembly For repairs you are strongly requested to contact a Kubota authorized pump service shop 1 Injection pump pressure test er 2 Injection nozzle 3 Protection cover for jetted fuel 1 Remove the engine stop solenoid 2 Remove the injection pipes and glow plugs 3 Install the injection pump pressure tester to the injection pump 4 Install...

Page 147: ...1849 psi 4 4 4 Checking nozzle spraying condition CAUTION Check the nozzle injection pressure and condition after you make sure that there is nobody standing in the direction the fume goes If the fume from the nozzle directly contacts the human body cells may be destroyed and blood poisoning may be caused a Good b Bad 1 Set the injection nozzle to a nozzle tester and check the nozzle spraying cond...

Page 148: ...eak at 12 75 MPa 130 0 kgf cm2 1849 psi 3 If any fuel leak is found replace the nozzle piece 4 4 7 Checking nozzle holder CAUTION Check the nozzle injection pressure and condition after you make sure that there is nobody standing in the direction the fume goes If the fume from the nozzle directly contacts the human body cells may be destroyed and blood poisoning may be caused 1 Nozzle holder 2 Adj...

Page 149: ...new engine oil through the oil inlet 2 to the upper line on the dipstick 3 BX2380 shown 2 Oil inlet 3 Dipstick BX1880 D722 E4 Engine oil Capacity 2 9 L 3 1 U S qts 2 6 Imp qts BX2380 D902 E4 Engine oil Capacity 3 1 L 3 3 U S qts 2 7 Imp qts BX2680 D1005 E4 Engine oil Capacity 3 5 L 3 7 U S qts 3 1 Imp qts Tightening tor que Drain plug with copper gasket M12 1 25 33 to 37 N m 3 3 to 3 8 kgf m 24 to...

Page 150: ...k brackets 2 1 Front link 2 Front link bracket 3 Bonnet guide rod 4 L H bonnet bracket 5 R H bonnet bracket 3 Open the bonnet 4 Disconnect the headlight harness from the headlights and bonnet 5 Disconnect the bonnet guide rod 3 from the bonnet 6 Disconnect the L H and R H bonnet brackets 4 5 from the frame 7 Remove the bonnet 6 6 Bonnet SERVICING 5 Disassembling and assembling 3 ENGINE BX1880 BX23...

Page 151: ...ect the ground cables 7 8 and 9 7 Ground cable Starer to frame 8 Ground cable Harness to frame 9 Ground cable Battery to L H engine support 10 Ground cable Wire harness to R H engine support 11 Nut When reassembling Tightening tor que Engine mounting nut 24 to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft 5 1 5 Disconnecting fuel hoses 1 Disconnect fuel return hose 1 and fuel supply hose 2 from engine 3...

Page 152: ...t as sembly bolt 24 to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft 5 1 8 Separating engine WARNING To avoid serious injury or death The engine is heavy Use a hoist or crane when removing the engine 1 Remove the engine mounting nuts 1 from both sides of the engine NOTE The rear engine mounting nuts secure ground cables to the L H and R H engine supports If the rear engine mounting nuts have already bee...

Page 153: ...Never open the radiator cap while operating or immediately after stopping Otherwise hot water will spout out from the radiator Wait for more than ten minutes to cool the radiator before opening the cap 1 Connect the engine stands 9 to the crankcase 2 Open the radiator drain plug and remove radiator cap to completely drain the coolant 3 After all coolant is drained close the drain plug 4 Loosen the...

Page 154: ...and valve 5 2 1 1 Removing cylinder head cover 1 Disconnect the breather hose 2 Remove the cylinder head cover nuts 3 Remove the cylinder head cover 1 1 Cylinder head cover When reassembling Check to see if the cylinder head cover gasket is not damaged BX1880 and BX2380 Tightening tor que Cylinder head cov er screw 9 81 to 11 2 N m 1 00 to 1 14 kgf m 7 24 to 8 31 lbf ft BX2680 Tightening tor que C...

Page 155: ...N m 5 0 to 7 0 kgf m 37 to 50 lbf ft Glow plug 7 9 to 14 N m 0 80 to 1 5 kgf m 5 8 to 10 lbf ft 5 2 1 4 Removing nozzle heat seal IMPORTANT Use a plus phillips head screw driver 1 that has a diameter which is bigger than the heat seal hole Heat seal hole Factory specifi cation Approximately 6 mm 1 4 in 1 Plus screw driver 2 Injection nozzle 3 Injection nozzle gasket 4 Heat seal 1 Drive screw drive...

Page 156: ...et BX1880 and BX2380 Tightening tor que Rocker arm brack et screw 9 81 to 11 2 N m 1 00 to 1 15 kgf m 7 24 to 8 31 lbf ft BX2680 Tightening tor que Rocker arm brack et screw 22 to 26 N m 2 2 to 2 7 kgf m 16 to 19 lbf ft 5 2 1 6 Removing cylinder head and cylinder head gasket 3 Pin pipe n to a To loosen a to n To tighten 1 Loosen the pipe clamps 1 and remove the water return pipe 2 1 Clamp 2 Return...

Page 157: ...and cams for proper rotation If problem is found replace tappets Before installing the tappets apply engine oil thinly around them 5 2 1 8 Removing valves IMPORTANT Do not change the combination of valve and valve guide 1 Valve spring replacer 2 Valve cap 3 Valve spring collet 4 Valve spring retainer 5 Valve spring 6 Valve stem seal 7 Valve 1 Remove the valve caps 2 2 Remove the valve spring colle...

Page 158: ...en for about 30 minutes and pour oil in the crankcase Liquid gasket Apply Thickness 5 0 mm 0 19 in After cleaning the oil strainer check to see that the filter mesh in clean and install it Visually check the O ring apply engine oil and install it Securely fit the O ring to the oil strainer To avoid uneven tightening tighten oil pan mounting screws in diagonal order from the center 5 2 2 2 Removing...

Page 159: ...ll it ensuring the lip does not come off 5 2 2 4 Removing speed control plate 1 Speed control plate 2 Governor spring 1 Remove the engine stop solenoid 2 Remove the speed control plate 1 When reassembling Apply a liquid gasket Three Bond 1215 or equivalent to both sides of the solenoid cover gasket and control plate gasket Be careful not to drop the governor spring 2 into the crankcase 3 ENGINE SE...

Page 160: ...en reassembling NOTE Addition or reduction of shim delays or advances the injection timing Shim 0 05 mm 0 002 in Delays or ad vances the in jection timing Approximately 0 0087 rad 0 50 In disassembling and replacing be sure to use the same number or new gasket shims with the same thickness When installing the injection pump insert the control rack pin 2 firmly into the groove 7 of the thrust lever...

Page 161: ... follow the procedures in 5 6 above and never remove fork lever and the max torque limiter When reassembling IMPORTANT When replacing the ball bearing of governor shaft securely fit the ball bearing 9 to the crankcase apply an adhesive Three Bond 1324B or equivalent to the set screw 12 and fasten the screw until its tapered part contacts the circumferential end of the ball bearing When installing ...

Page 162: ...nd bring the piston to top dead center 2 Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer 3 Draw out the other piston in the same method as above When reassembling IMPORTANT Do not change the combination of cylinder and piston Make sure of the position of each piston by marking For example mark 1 on the No 1 piston When installing the pist...

Page 163: ...hange the combination Install the rings so that the manufacturer s mark 12 near the gap faces the top of the piston 12 Manufacturer s mark When installing the oil ring onto the piston place the expander joint 10 on the opposite side of the oil ring gap 11 10 Expander joint 11 Oil ring gap Apply engine oil to the piston pin When installing the connecting rod to the piston immerse the piston in oil ...

Page 164: ...surface of the flywheel screw and fit the screw Tightening tor que Flywheel screw 54 to 58 N m 5 5 to 6 0 kgf m 40 to 43 lbf ft 5 2 4 2 Removing bearing case cover 1 Bearing case cover mount ing screw Inside 2 Bearing case cover mount ing screw Outside 3 Bearing case gasket 4 Bearing case cover gasket 5 Oil seal 6 Bearing case cover a Top mark UP 1 Remove the bearing case cover mounting screws 2 R...

Page 165: ...ply oil to the main bearing case screw 2 1 Install the crankshaft assembly aligning the screw hole of main bearing case with the screw hole of crankcase Clean the oil passage of the crankshaft with compressed air BX1880 and BX2380 Tightening tor que Main bearing case screw 2 27 to 30 N m 2 8 to 3 0 kgf m 20 to 22 lbf ft BX2680 Tightening tor que Main bearing case screw 2 49 to 53 N m 5 0 to 5 4 kg...

Page 166: ... 27 in long to the crown of the piston keep the gauges away from the intake valve and combustion chamber fittings 1 Plastigauge 3 Take the piston to an intermediate position install the cylinder head and tighten the head bolts to the specified torque BX1880 and BX2380 Tightening tor que Cylinder head screw 38 to 42 N m 3 9 to 4 2 kgf m 28 to 30 lbf ft BX2680 Tightening tor que Cylinder head screw ...

Page 167: ...linder head flaw 1 Red permeative liquid 2 Detergent 3 White developer 1 Prepare an air spray red check 2 Clean the surface of the cylinder head with detergent 2 3 Spray the cylinder head surface with the red permeative liquid 1 Leave it five to ten minutes after spraying 4 Wash away the red permeative liquid on the cylinder head surface with the detergent 2 5 Spray the cylinder head surface with ...

Page 168: ...016 recessing in 5 If it still exceeds the allowable limit after replacing the valve replace the cylinder head 6 1 5 Checking clearance between valve stem and valve guide 1 Remove carbon from the valve guide section 2 Measure the valve stem O D with an outside micrometer BX1880 and BX2380 Valve stem O D Factory specifi cation 5 968 to 5 980 mm 0 2350 to 0 2354 in BX2680 Valve stem O D Factory spec...

Page 169: ...sing a valve guide replacing tool 3 Ream precisely the I D of the valve guide to the specified dimension BX1880 and BX2380 Valve guide I D Intake and ex haust Factory specifi cation 6 010 to 6 025 mm 0 2366 to 0 2372 in BX2680 Valve guide I D Intake and ex haust Factory specifi cation 7 010 to 7 025 mm 0 2760 to 0 2766 in RELATED PAGE 1 Special tools for engine on page 2 55 6 1 7 Checking valve se...

Page 170: ... 60 intake valve or 0 79 rad 45 exhaust valve valve seat cutter BX1880 and BX2380 Valve seat angle Factory specifi cation 0 79 rad 45 BX2680 Valve seat an gle Factory speci fication IN 1 0 rad 60 EX 0 79 rad 45 2 Resurface the seat surface with a 0 52 rad 30 valve seat cutter to intake valve seat and with a 0 26 rad 15 valve seat cutter to exhaust valve seat so that the width is close to specified...

Page 171: ...cifi cation 31 3 to 31 8 mm 1 24 to 1 25 in Allowable limit 28 4 mm 1 12 in BX2680 Free length B Factory specifi cation 37 0 to 37 5 mm 1 46 to 1 47 in Allowable limit 36 5 mm 1 44 in 2 Put the valve spring on a surface plate place a square on the side of the valve spring 3 Check to see if the entire side is in contact with the square Rotate the valve spring and measure the maximum tilt A If the m...

Page 172: ...nd BX2380 Rocker arm I D Factory specifi cation 10 500 to 10 518 mm 0 41339 to 0 41409 in BX2680 Rocker arm I D Factory specifi cation 12 000 to 12 018 mm 0 47244 to 0 47314 in 3 If the oil clearance exceeds the allowable limit replace the rocker arm and measure the oil clearance again If it still exceeds the allowable limit replace also the rocker arm shaft BX1880 and BX2380 Oil clearance be twee...

Page 173: ...8822 in 3 If the oil clearance exceeds the allowable limit or the tappet is damaged replace the tappet BX1880 and BX2380 Oil clearance be tween tappet and tappet guide bore Factory specifi cation 0 016 to 0 052 mm 0 00063 to 0 0020 in Allowable limit 0 10 mm 0 0039 in BX2680 Oil clearance be tween tappet and tappet guide bore Factory specifi cation 0 020 to 0 062 mm 0 00079 to 0 0024 in Allowable ...

Page 174: ...etween idle gear 1 and in jection pump gear Factory specifi cation 0 0340 to 0 116 mm 0 00134 to 0 00456 in Allowable limit 0 15 mm 0 0059 in 4 If the oil clearance is proper replace the gear 6 2 2 Checking idle gear 1 side clearance 1 Set a dial indicator with its tip on the idle gear 2 Measure the side clearance by moving the idle gear to the front and rear 3 If the measurement exceeds the allow...

Page 175: ...ht of in take and exhaust Factory specifi cation 26 88 mm 1 058 in Allowable limit 26 83 mm 1 056 in BX2680 Cam height of in take Factory specifi cation 28 80 mm 1 134 in Allowable limit 28 75 mm 1 132 in Cam height of ex haust Factory specifi cation 29 00 mm 1 142 in Allowable limit 28 95 mm 1 140 in 6 2 6 Checking oil clearance of camshaft journal 1 Measure the camshaft journal O D with an outsi...

Page 176: ... O D Factory specifi cation 19 967 to 19 980 mm 0 78611 to 0 78661 in BX2680 Idle gear shaft 1 O D Factory specifi cation 25 967 to 25 980 mm 1 0224 to 1 0228 in 2 Measure the idle gear bushing I D with an inside micrometer and calculate the oil clearance BX1880 and BX2380 Idle gear bushing 1 I D Factory specifi cation 20 000 to 20 051 mm 0 78741 to 0 78940 in BX2680 Idle gear bushing 1 I D Factor...

Page 177: ... limit 20 05 mm 0 7894 in BX2680 Piston pin bore I D Factory specifi cation 22 000 to 22 013 mm 0 86615 to 0 86665 in Allowable limit 22 03 mm 0 8673 in 6 3 2 Checking oil clearance between piston pin and small end bushing 1 Measure the piston pin O D where it contacts the bushing with an outside micrometer BX1880 and BX2380 Piston pin O D Factory specifi cation 20 002 to 20 011 mm 0 78748 to 0 78...

Page 178: ...15 to 0 038 mm 0 00056 to 0 0014 in Allowable limit 0 15 mm 0 0059 in BX1880 and BX2380 Small end bushing I D Spare parts Factory specifi cation 20 026 to 20 077 mm 0 78843 to 0 79043 n BX2680 Small end bushing I D Spare parts Factory specifi cation 22 025 to 22 040 mm 0 86713 to 0 86771 in When removing 1 Press out the used bushing using a small end bushing replacing tool See Special tools When i...

Page 179: ...ry speci fication 0 15 to 0 30 mm 0 0059 to 0 011 in Allowable limit 1 20 mm 0 0472 in BX2380 Piston ring gap Top ring Factory speci fication 0 20 to 0 35 mm 0 0079 to 0 013 in Allowable limit 1 25 mm 0 0492 in Second ring Factory speci fication 0 35 to 0 50 mm 0 014 to 0 019 in Allowable limit 1 25 mm 0 0492 in Oil ring Factory speci fication 0 20 to 0 35 mm 0 0079 to 0 013 in Allowable limit 1 2...

Page 180: ...0335 to 0 00440 in Allowable limit 0 2 mm 0 008 in Oil ring Factory speci fication 0 020 to 0 060 mm 0 00079 to 0 0023 in Allowable limit 0 15 mm 0 0059 in 4 If the clearance still exceeds the allowable limit with new ring replace the piston 6 4 Crankshaft 6 4 1 Checking crankshaft side clearance 1 Set a dial indicator with its tip on the end of the crankshaft 2 Measure the side clearance by movin...

Page 181: ... crankshaft journal BX2680 Oversize 0 20 mm 0 0079 in 0 40 mm 0 016 in Dimension A 51 50 to 51 70 mm 2 028 to 2 035 in 51 60 to 51 80 mm 2 032 to 2 039 in Dimension B 28 20 to 28 25 mm 1 111 to 1 112 in 28 40 to 28 45 mm 1 119 to 1 120 in Dimension C 2 3 to 2 7 mm radi us 0 091 to 0 10 in ra dius 2 3 to 2 7 mm radi us 0 091 to 0 10 in ra dius The crankshaft journal must be fine finished to higher ...

Page 182: ... replace it with an undersize one referring to the table and figure Undersize crankpin bearing BX1880 and BX2380 Undersize Bearing Code num ber Marking 0 20 mm 0 0079 in Crankpin bearing 02 15861 22970 020 US 0 40 mm 0 016 in Crankpin bearing 04 15861 22980 040 US Undersize dimensions of crankpin BX1880 and BX2380 Undersize 0 20 mm 0 0079 in 0 40 mm 0 016 in Dimension A 2 3 to 2 7 mm radi us 0 091...

Page 183: ... D Factory specifi cation 39 984 to 40 040 mm 1 5742 to 1 5763 in BX2380 Crankshaft bearing 1 I D Factory specifi cation 43 984 to 44 040 mm 1 7317 to 1 7338 in BX2680 Crankshaft bearing 1 I D Factory specifi cation 47 984 to 48 048 mm 1 8892 to 1 8916 in 3 If the oil clearance exceeds the allowable limit replace the crankshaft bearing 1 BX1880 Oil clearance be tween crankshaft journal and crank s...

Page 184: ...mm 0 016 in Dimension A 1 8 to 2 2 mm radi us 0 071 to 0 086 in radius 1 8 to 2 2 mm radi us 0 071 to 0 086 in radius Dimension B 1 0 to 1 5 mm relief 0 040 to 0 059 in relief 1 0 to 1 5 mm relief 0 040 to 0 059 in relief Dimension C 43 734 to 43 750 mm dia 1 7219 to 1 7224 in dia 43 534 to 43 550 mm dia 1 7140 to 1 7145 in dia The crankshaft journal must be fine finished to higher than Max 0 8S U...

Page 185: ... Crankshaft bearing 2 I D 47 984 to 48 029 mm 1 8892 to 1 8909 in Crankshaft journal O D Intermedi ate 47 934 to 47 950 mm 1 8872 to 1 8877 in Crankshaft bearing 3 I D 51 974 to 52 019 mm 2 0463 to 2 0479 in 1 Put a strip of plastigauge on the center of the journal 2 Install the bearing case and tighten the bearing case screws 1 to the specified torque and remove the bearing case again 3 Measure t...

Page 186: ... 059 in relief Dimension C 39 734 to 39 750 mm dia 1 5644 to 1 5649 in dia 39 534 to 39 550 mm dia 1 5565 to 1 5570 in dia The crankshaft journal must be fine finished to higher than Max 0 8S Holes to be DE burred and edges rounded with 1 0 to 1 5 mm 0 040 to 0 059 in relief Undersize dimensions of crankshaft journal BX2380 Undersize 0 20 mm 0 0079 in 0 40 mm 0 016 in Dimension A 1 8 to 2 2 mm rad...

Page 187: ... hone to the oversize dimension BX1880 Cylinder liner I D Factory specifi cation 67 000 to 67 019 mm 2 6378 to 2 6385 in Allowable limit 67 150 mm 26437 in BX2380 Cylinder liner I D Factory specifi cation 72 000 to 72 019 mm 2 8347 to 2 8353 in Allowable limit 72 150 mm 2 8406 in BX2680 Cylinder liner I D Factory specifi cation 76 000 to 76 019 mm 2 9922 to 2 9928 in Allowable limit 76 15 mm 2 998...

Page 188: ...ing 025 NOTE When the oversize cylinder is worn beyond the allowable limit replace the cylinder block with a new one 6 6 Oil pump 6 6 1 Checking rotor lobe clearance 1 Measure the clearance between lobes of the inner rotor and the outer rotor with a thickness gauge 2 If the clearance exceeds the factory specifications replace the oil pump rotor assembly Rotor lobe clear ance Factory specifi cation...

Page 189: ...35 mm 0 00296 to 0 00531 in 6 7 Relief valve spring 6 7 1 Checking relief valve 1 Relief valve 2 Joint 3 Spring 1 Remove the oil filter base 2 Check the relief valve for dirt and the seat and ball for damage 3 If damaged replace 4 Check the free length of spring 5 If less than the allowable limit replace Relief valve spring Factory specifi cation 32 mm 1 26 in Allowable limit 28 mm 1 10 in When re...

Page 190: ...4 TRANSAXLE KiSC issued 03 2019 A ...

Page 191: ...Front wheel drive gear section 5 Mid PTO section 6 PTO gear shift section 7 Rear PTO section 8 Differential gear section 9 Brake section A Front side B Rear side MECHANISM 1 Structure of transaxle 4 TRANSAXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 4 1 KiSC issued 03 2019 A ...

Page 192: ... Trunnion arm 3 Center section 4 Piston spring 5 Piston 6 Thrust ball bearing 7 Swashplate 8 Cradle bearing 9 Spring 10 Circlip 11 Spring 12 Circlip 13 Thrust ball bearing 14 Cylinder block Motor 15 Plug 16 Motor shaft 17 Needle bearing 18 Ball bearing 19 Pump shaft 20 Cylinder block Pump 21 Charge relief valve 4 TRANSAXLE MECHANISM 2 Traveling system 4 2 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23B...

Page 193: ...he charge relief valve into the HST housing And overflow oil from HST housing return to the transmission case 1 Cylinder block Pump 2 Swashplate 3 Piston 4 Cylinder block Motor 5 Check and high pressure relief valve Forward 6 Check and high pressure relief valve Reverse 7 High pressure relief port plug Forward 8 Charge relief valve 9 High pressure relief port plug Reverse 10 PTO clutch valve 11 PT...

Page 194: ... relief valve Forward 6 Check and high pressure relief valve Reverse 7 High pressure relief port plug Forward 8 Charge relief valve 9 High pressure relief port plug Reverse 10 PTO clutch valve 11 PTO relief valve 12 Oil filter cartridge 13 Power steering controller 14 Hydraulic pump 15 Flow priority valve Hydraulic control valve 16 Position control valve 17 Oil strainer 18 Transmission case A A po...

Page 195: ...tate oil is forced out of motor port C at low pressure and returns to the pump 1 Cylinder block Pump 2 Swashplate 3 Piston 4 Cylinder block Motor 5 Check and high pressure relief valve Forward 6 Check and high pressure relief valve Reverse 7 High pressure relief port plug Forward 8 Charge relief valve 9 High pressure relief port plug Reverse 10 PTO clutch valve 11 PTO relief valve 12 Oil filter ca...

Page 196: ...tate oil is forced out of motor port D at low pressure and returns to the pump 1 Cylinder block Pump 2 Swashplate 3 Piston 4 Cylinder block Motor 5 Check and high pressure relief valve Forward 6 Check and high pressure relief valve Reverse 7 High pressure relief port plug Forward 8 Charge relief valve 9 High pressure relief port plug Reverse 10 PTO clutch valve 11 PTO relief valve 12 Oil filter ca...

Page 197: ...d and the angle of pump swashplate determines the output shaft speed As the motor cylinder block continues to rotate oil is forced out of motor port D at low pressure and returns to the pump 1 Cylinder block Pump 2 Swashplate 3 Piston 4 Cylinder block Motor 5 Check and high pressure relief valve Forward 6 Check and high pressure relief valve Reverse 7 High pressure relief port plug Forward 8 Charg...

Page 198: ...ate is returned to neutral when the pedal is released The damper 10 connected to the HST pedal link 8 restricts the movement of the linkage to prevent abrupt operation or reversing Moreover the feeling of the dynamic braking can be adjusted by changing the arm 11 position of damper 10 1 Neutral spring 2 Trunnion arm 3 Cruise rod 4 Speed control pedal 5 Cruise arm 6 Cruise lock 7 Cruise lock 8 HST ...

Page 199: ...otated counter clockwise When depressing the speed control pedal 2 forward the HST pedal link clockwise Since both the cruise lock 3 of the cruise plate 5 and the cruise lock 4 of HST pedal link 6 are locked the speed control pedal 2 is held at a selected position MECHANISM 2 Traveling system 4 TRANSAXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 4 9 KiSC issued...

Page 200: ...4 TRANSAXLE MECHANISM 2 Traveling system 4 10 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 201: ...k 7 Speed change rod 8 Damper 9 Trunnion arm 10 Release plate A Speed set rod OFF B Speed set rod ON C Speed control pedal Forward D Cruise lock Locked MECHANISM 2 Traveling system 4 TRANSAXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 4 11 KiSC issued 03 2019 A ...

Page 202: ... wise and releases the cruise lock 2 2 Range gear shift section 2 2 1 Structure of range gear shift Two kinds of power flow are selected by operating the range gear shift lever to shift the 16T 24T shifter gear 4 on the spiral bevel pinion shaft 3 1 25T gear 2 17T gear 3 Spiral bevel pinion shaft 4 16T 24T shifter gear L Low range H High range Low range 17T gear shaft 2 Shifter gear 24T 4 Spiral b...

Page 203: ...el drive lever is set to disengaged position the 19T shifter gear 2 is neutral and power is not transmitted to the front wheel drive shaft 1 Front wheel drive engaged When the front wheel drive lever is set to engaged position the 19T shifter gear 2 slides to the right to engage with 13T 25T gear shaft 5 Therefore the power from spiral bevel pinion shaft 3 is transmitted to the front wheel drive s...

Page 204: ...fferential side gears 5 9 When rotation of one differential side gear becomes lower than the other differential pinions 2 8 begin rotating around differential pinion shaft 6 The other differential side gear is increased in speed by the speed increment of differential pinion shaft 6 This means that rotation of one rear axle is slowed down and that of the other rear axle is increased Thus the tracto...

Page 205: ...al gear shaft 5 Differential side gear 6 Differential pinion shaft 7 66T final gear 8 Differential pinion 9 Differential side gear MECHANISM 2 Traveling system 4 TRANSAXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 4 15 KiSC issued 03 2019 A ...

Page 206: ...rential side gear 9 The pins on the differential lock shifter 2 go into the holes in the differential case 3 to cause the differential case 3 differential lock shifter 2 and differential side gear 9 to rotate as a unit Therefore differential pinions 4 11 are unable to rotate around differential pinion shaft 10 and identical revolutions are transmitted to the right and left rear axle 1 5 1 Rear axl...

Page 207: ...tle adjustment The brake body is incorporated in the transmission case and axle cover filled with transmission oil For greater braking force four brake discs 11 are provided at the brake shaft and the friction plates 5 fixed to the transmission case is arranged between the brake discs 11 MECHANISM 2 Traveling system 4 TRANSAXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK...

Page 208: ...the brake rod 15 pulls the brake cam lever 8 Therefore the cam plates also move and ride on the steel balls set in the grooves of the transmission case to press the brake disc the final gear shaft is braked by the frictional force generated by the cam plate and brake disc Parking brake When the parking brake is applied the brake pedal 13 is locked by the parking brake lock pedal 14 4 TRANSAXLE MEC...

Page 209: ...low from the power steering controller The PTO clutch valve 5 controls the hydraulic oil flow from power steering controller to the PTO clutch pack 2 by operating the PTO clutch lever through the linkage 1 PTO select gear 2 PTO clutch pack 3 Rear PTO shaft 4 Transmission case 5 PTO clutch valve 6 PTO clutch relief valve 7 Oil filter cartridge A From HST pump shaft B To mid PTO C From power steerin...

Page 210: ...ower is transmitted from the HST pump shaft 1 through the PTO clutch to the clutch gear 2 and the PTO shafts 1 HST pump shaft 2 Clutch gear 3 Clutch case 4 Clutch piston 5 Clutch plate 6 Clutch disc 7 Spring 8 Spline boss 9 O ring 10 Transaxle case 11 Brake disc A From PTO clutch valve B Power to PTO shaft C PTO clutch engaged 3 1 3 Disengaged function of PTO clutch When the PTO clutch lever is se...

Page 211: ...TO shaft 8 28T PTO select gear 9 11T gear shaft Mid PTO position A PTO clutch pack 3 12T clutch gear 2 28T PTO select gear 8 23T mid PTO gear 5 24T mid PTO idle gear 6 Mid PTO shaft 7 Rear PTO position B PTO clutch pack 3 12T clutch gear 2 28T PTO select gear 8 11T gear shaft 9 Rear PTO shaft 4 Mid and rear PTO position A and B at the same time MECHANISM 3 PTO system 4 TRANSAXLE BX1880 BX2380 BX26...

Page 212: ...ydraulic pump drive gear 5 mounted on the hydraulic pump drive gear shaft 4 through the idle gear 3 1 HST pump shaft 2 Spline boss 3 Idle gear 4 Hydraulic pump drive gear shaft 5 Hydraulic pump drive gear 6 Hydraulic pump drive gear shaft 7 Hydraulic pump 8 Flow priority valve 9 Relief valve 3P hitch 10 Transmission case 4 TRANSAXLE MECHANISM 4 Others 4 22 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23...

Page 213: ...ck oil level or fill oil to proper level 2 34 2 Speed control pedal linkage damaged Repair linkage 4 42 3 Charge pressure is too low 1 Replace oil filter cartridge 2 24 2 Check charge pressure 4 31 3 Inspect or flush charge relief valve 4 57 4 Check and high pressure relief valve does not move smoothly Inspect or replace check and high pressure relief valve 4 57 5 Component parts damaged Replace h...

Page 214: ...f valve 4 31 4 57 Machine will not stop in neutral position 1 Speed control linkage is out of adjustment or sticking 1 Repair or replace linkage 4 42 2 Adjust neutral position 4 29 System operates in one direction only 1 Speed control linkage dam aged Repair or replace linkage 4 42 2 Check and high pressure relief valve damaged Replace check and high pres sure relief valve 4 57 4 57 Traveling gear...

Page 215: ...tial pinions or differen tial side gears worn or damaged Replace 4 53 2 Differential lock binding does not disengaged Replace 4 53 3 Bearing worn Replace Differential lock cannot be set 1 Differential lock shift fork dam aged Replace 4 53 2 Differential lock shifter mount ing pin damaged Replace 4 53 3 Differential lock pin damaged Replace 4 53 Differential lock pedal does not return 1 Differentia...

Page 216: ...lution Refer ence page PTO clutch slips 1 Operating pressure is low Check 4 35 2 PTO clutch valve malfunction ing Repair or replace 4 43 3 Clutch disc or drive plate ex cessively worn Replace 4 55 4 Deformation of clutch piston Replace 4 55 PTO shaft does not rotate 1 PTO clutch malfunctioning Repair or replace 4 55 PTO clutch operating pressure is low 1 Transmission oil improper or insufficient F...

Page 217: ...728 in Differential case to differential side gear Clearance 0 0500 to 0 151 mm 0 00197 to 0 00594 in 0 30 mm 0 012 in Differential case I D 38 000 to 38 062 mm 1 4961 to 1 4985 in Differential side gear O D 37 911 to 37 950 mm 1 4926 to 1 4940 in Differential pinion shaft to differen tial pinion Clearance 0 0800 to 0 122 mm 0 00315 to 0 00480 in 0 30 mm 0 012 in Differential pinion I D 20 060 to ...

Page 218: ... 4 47 to 53 Transaxle assembly mounting screw M14 124 to 147 12 6 to 15 0 91 2 to 108 Rear coupling mounting screw M8 24 to 27 2 4 to 2 8 18 to 20 Front coupling mounting screw M8 24 to 27 2 4 to 2 8 18 to 20 HST fan mounting screw M8 9 8 to 11 1 0 to 1 2 7 3 to 8 6 Hydraulic control lever mounting bolt and nut M8 18 to 20 1 8 to 2 1 13 to 15 HST front cover mounting bolt and nut M10 18 to 20 1 8 ...

Page 219: ...0 689 in 6 Finally check the traveling speed or rear axle shaft rotation speed 7 If the measurement is not within the references check the adjusting bolt length A B Maximum rear axle shaft speed At engine maxi mum speed and low range Reference 52 2 min 1 52 2 rpm BX1880 Maximum traveling speed At engine maximum speed Forward 12 0 to 13 0 km h 7 46 to 8 07 mph Reverse 9 00 to 10 0 km h 5 60 to 6 21...

Page 220: ...neutral position 10 Depress the speed control pedal to reverse speed position and release the foot from the speed control pedal Check the rear axle or the wheel stops rotating If the rear axle or the wheel does not stop rotating adjust the locking screw 4 to stop rotating 11 After adjusting the neutral position tighten the locking screw 4 securely 4 3 Checking and adjusting HST neutral spring dyna...

Page 221: ...fication 3 m 10 ft Adjusting the HST neutral spring tension 1 Remove the step from the machine 2 Loosen the lock nut 2 3 Turn the adjusting nut 3 half turn to pull the HST neutral spring 1 4 Tighten and lock the lock nut 2 5 Start the engine and check dynamic brake as mentioned former 6 If the machine will not stop with dynamic brake in the specified distance adjust the neutral spring again The fe...

Page 222: ...IMPORTANT Measure quickly the high relief pressure within about 10 seconds 1 P1 port Reverse 2 P2 port Forward 1 Jack up the machine 2 Remove the hexagon socket head plug R 1 4 from P2 2 then install the adapter cable and pressure gauge 3 Start the engine and operate it at maximum speed 4 Set the range gear shift lever to hi position 5 Depress the speed control pedal to forward and read the pressu...

Page 223: ...pply liquid lock Three Bond 1324 or its equivalent to the plug Tightening tor que Hexagon socket head plug P1 and P2 port 30 to 44 N m 3 0 to 4 5 kgf m 22 to 32 lbf ft 4 7 Readjusting relief valve When HST does not work due to its loose hexagon socket head screw IMPORTANT KUBOTA does not recommend readjusting the relief valve KUBOTA recommends replacing it with genuine parts As the HST may be dama...

Page 224: ...his occasion use a copper plate etc for the vice jaws not to damage the setscrew 6 Tightening tor que Hexagon socket head screw 25 to 29 N m 2 5 to 3 0 kgf m 18 to 21 lbf ft 6 Install the relief valve in the HST 7 Check the relief pressure as indicated in Checking high relief pressure Forward and Checking high relief pressure Reverse The distance A is for refresh only Make sure to check the relief...

Page 225: ...et head plug apply liquid lock Three Bond 1324 or its equivalent to the plug Tightening tor que PTO clutch valve plug R 1 8 13 to 21 N m 1 3 to 2 2 kgf m 9 4 to 15 lbf ft 4 9 Adjusting brake pedal free travel CAUTION Stop the engine remove the key lower the implement to the ground and chock the wheels before checking brake pedal Even if the brake pedal free travel is within the limitation adjust t...

Page 226: ...filling plug 2 up to the upper notch on the dipstick 3 2 Filling plug 3 Dipstick A Oil level is acceptable within this range After operating the engine for a few minutes stop it and check the oil level again if low add oil to prescribed level Transmission fluid Capacity 11 3 L 2 99 U S gals 2 49 Imp gals RELATED PAGE 1 1 Lubricants fuel and coolant on page 2 7 5 1 2 Removing battery WARNING To avo...

Page 227: ...ush 9 Shaft 5 1 4 Removing ROPS 1 Disconnect the R H and L H hazard lamp turn signals 3 4 from the wire harness 2 Remove the upper ROPS 1 1 Upper ROPS 2 R H lower ROPS 3 R H hazard lamp turn signal 4 L H hazard lamp turn signal 5 L H lower ROPS 6 Bolt 3 Remove the ROPS mounting bolts 6 4 Remove the R H and L H lower ROPS 2 5 When reassembling Tightening torque ROPS mount ing bolt 48 0 to 55 9 N m ...

Page 228: ... near the L H tail lamp connector 3 Remove the L H lever grips 3 1 Tail lamp 2 12 V outlet 3 L H lever grip 4 Differential lock pedal cover 5 Cutting height adjusting dial knob 6 Lowering speed adjusting knob 7 R H lever grip 4 Remove the differential lock pedal cover 4 cutting height adjusting dial knob 5 and lower speed adjusting knob 6 5 Remove the R H lever grips 7 6 Remove the R H lever guide...

Page 229: ... m 12 6 to 15 0 kgf m 91 2 to 108 lbf ft 5 1 9 Removing rear wheel 1 Remove the rear wheels 1 2 1 L H rear wheel 2 R H rear wheel When reassembling Tightening tor que Rear wheel mount ing bolt 109 to 129 N m 11 1 to 13 2 kgf m 80 3 to 95 4 lbf ft 5 1 10 Removing fender center stay 1 Remove the fender center stay 1 1 Fender center stay When reassembling Tightening tor que Fender center stay mountin...

Page 230: ...k rod 1 and disconnect the mower link 2 1 Differential lock rod 2 Mower link 2 Remove the brake rod 4 3 Disconnect the hoses 3 If equipped 3 Hoses 4 Brake rod 4 Disconnect the connectors 5 5 Remove the rear coupling mounting bolt 8 6 Disconnect the power steering pipes 9 from the transaxle 7 Remove the speed control rod 7 5 Connector 6 Front wheel drive shaft 7 Speed control rod 8 Rear coupling mo...

Page 231: ...g bolt M14 124 to 147 N m 12 6 to 15 0 kgf m 91 2 to 108 lbf ft Rear coupling mounting bolt M8 24 to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft 5 1 13 Removing brake pedal 1 Unhook the spring 2 and remove the parking lock 1 1 Parking lock 2 Spring 3 Parking arm 2 Remove the split pin then remove pin 5 from the brake arm 4 3 Remove the brake pedal 6 4 Brake arm 5 Pin 6 Brake pedal SERVICING 5 Disassem...

Page 232: ... lock pedal 3 Rue ring cotter 4 Differential lock rod 2 Remove the rue ring cotter 3 3 Turn and remove the differential lock pedal 2 5 1 16 Removing speed control pedal HST damper and cruise rod 1 Remove the speed control pedal 1 2 Remove the rue ring cotter 4 3 Remove the HST dumper 2 1 Speed control pedal 2 HST dumper 3 HST pedal link 4 Rue ring cotter 4 Remove the cruise arm 6 5 Remove the crui...

Page 233: ... When reassembling Apply grease to inside of the front coupling and rear mounting Tightening tor que Hydraulic control lever mounting bolt and nut 18 to 20 N m 1 8 to 2 1 kgf m 13 to 15 lbf ft 5 2 2 Removing PTO clutch valve 1 Stopper 2 PTO clutch valve 3 O ring 4 Oil passage 1 Remove the stopper 1 2 Draw out the PTO clutch valve 2 from the transaxle assembly When reassembling 1 Clean the oil pass...

Page 234: ... m 1 8 to 2 1 kgf m 13 to 15 lbf ft Oil cooler cover mounting nut M8 18 to 20 N m 1 8 to 2 1 kgf m 13 to 15 lbf ft 5 2 4 Removing center section and valve plates 1 Center section 2 Valve plate 1 Remove the valve plates 2 When reassembling 2 Valve plate 3 Groove 4 Anchor pin 1 Check the direction of the groove 3 2 Install the valve plates 2 to the anchor pins 4 securely 3 Install the groove of the ...

Page 235: ...ring 3 and the check and high pressure relief valve assembly 4 5 When reassembling Be careful not to damage the O ring 2 on the plug 1 Since there is an orifice in the check and relief valve body reverse 5 re install the check and relief valve 4 5 to their original positions Orifice Factory specifi cation 1 5 mm 0 059 in 5 2 7 Removing cylinder block 3 Pump shaft 4 Cylinder block assembly Pump sid...

Page 236: ...amage the surface of the cylinder block and the piston 1 Remove the piston 3 and the spring 2 from the cylinder block 1 1 Cylinder block 2 Spring 3 Piston When reassembling Apply clean transmission oil to the cylinder block and the piston 5 2 9 Removing swashplate and trust roller bearing 1 Motor shaft 2 Thrust bearing 3 Pump shaft 4 Thrust roller bearing 5 Swashplate 7 Slot guide 8 Cradle bearing...

Page 237: ... the detent spring 2 and the detent ball 3 before removing the transaxle front case not to drop the detent ball 3 into the transaxle case 1 4WD detent bolt 2 Detent spring 3 Detent ball 4 Transaxle front case 5 2 11 Removing neutral arm and trunnion arm 1 Bolt 2 Neutral spring 3 Neutral arm 4 Lock screw 5 Neutral adjuster 6 Trunnion arm 7 External circlip 1 Disconnect the neutral spring 2 from the...

Page 238: ...the joint surface of the transaxle case to the hydraulic cylinder Tightening tor que Hydraulic cylinder mounting bolt 40 to 44 N m 4 0 to 4 5 kgf m 29 to 32 lbf ft 5 4 Transaxle shafts 5 4 1 Removing transaxle case front cover NOTE Before removing the transaxle case front cover 4 remove the 4WD detent bolt 1 the detent spring 2 and the detent ball 3 from the transaxle case front cover 4 Remove the...

Page 239: ...ransaxle case front cover mounting bolts 7 2 Remove the transaxle case front cover 4 as an unit When reassembling Apply liquid gasket Three Bond 1208D or equivalent to the joint surface of the transaxle case to the front cover Tightening tor que Transaxle case front cover mount ing bolt M10 39 to 44 N m 4 0 to 4 4 kgf m 29 to 32 lbf ft SERVICING 5 Disassembling and assembling 4 TRANSAXLE BX1880 BX...

Page 240: ... rings Since the mounting bolt 2 is installed through the hydraulic pump to the transaxle case bind the sealing tape to the mounting bolt 2 securely Tightening tor que Hydraulic pump assembly mount ing bolt M6 7 9 to 8 8 N m 0 80 to 0 90 kgf m 5 8 to 6 5 lbf ft Hydraulic pump assembly mount ing bolt M8 18 to 20 N m 1 8 to 2 1 kgf m 13 to 15 lbf ft 4 TRANSAXLE SERVICING 5 Disassembling and assembli...

Page 241: ...ately the bearing thickness Apply liquid gasket Three Bond 1208D or equivalent to the joint surface of transaxle case to the rear PTO cover Bind the vinyl tape to the rear PTO shaft not to damage the oil seal Tightening tor que Rear PTO cover mounting bolt M8 18 to 20 N m 1 8 to 2 1 kgf m 13 to 15 lbf ft 5 4 4 Disassembling rear axle L H NOTE Prepare a specially bent circlip pliers SERVICING 5 Dis...

Page 242: ...ar axle from the rear axle case When reassembling Do not damage the oil seal 5 4 5 Removing rear axle case R H 2 37T spiral bevel gear 3 10T final gear shaft Brake shaft 4 66T final gear 1 Remove the rear axle case R H mounting bolts 4 TRANSAXLE SERVICING 5 Disassembling and assembling 4 52 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 243: ...gear 2 Bearing 3 Differential lock shift fork 4 Bearing 5 Differential lock shifter 7 Differential case 8 Differential pinion shaft 9 Differential side gear 10 Differential side gear washer 11 Key 12 Differential pinion 13 Differential pinion washer 14 Differential side gear 15 Differential side gear washer 16 Differential pinion 17 Differential pinion washer 1 Remove the bearing 2 with a puller 2...

Page 244: ...4 7 Removing rear axle case R H and brake 1 Internal circlip 2 Brake cam lever 3 External circlip 4 Steel ball 5 Actuator 6 Brake disc 7 Friction plate 8 Bearing holder 9 Shim 1 Remove the internal circlip 1 2 Remove the shim 9 the bearing holder 8 and the other brake parts from the brake case When reassembling Apply grease to the steel balls Be careful not to damage the O ring on the brake cam le...

Page 245: ...e external circlip and the clutch gear 3 3 Remove the seal rings 6 4 Remove the bearing 5 5 Remove the external circlip 18 using a clutch spring compressor 6 Disassembling the clutch pack inner parts as show in the figure When reassembling Change the seal rings 6 with new ones 5 5 Assembling shafts 5 5 1 Assembling select arms and HST pump shaft PTO clutch shaft Be careful not to damage the O ring...

Page 246: ...mp shaft assembly 4 After installing the rear PTO cover to the transaxle case install the PTO select gear shaft 6 5 Install the HST pump shaft PTO clutch shaft 5 5 5 2 Assembling front wheel drive shaft shifter spiral bevel pinion shaft and mid PTO shaft 1 Front wheel drive shaft 2 Shifter 3 Spiral bevel pinion shaft 1 Install the front wheel drive shaft 1 2 Install the shifter 2 and the spiral be...

Page 247: ...f valve 1 and the spring 2 2 If damages are found replace it 6 1 3 Checking check and high pressure relief valve NOTE Check and high pressure relief valve reverse has a pin hole Pin hole Factory specifi cation 1 5 mm 0 059 in 1 Plug 2 O ring 3 Spring 4 Check and high pressure re lief valve Forward 5 Check and high pressure re lief valve Reverse 1 Check the check and high pressure relief valve 4 5 ...

Page 248: ...If it is scored replace the cylinder block assembly 6 1 5 Checking thrust washer thrust roller bearing thrust plate and cradle bearing 1 Swashplate 2 Thrust washer 3 Thrust bearing 4 Thrust plate 1 Check the thrust bearing 3 for scratches and excessive wear 2 If it is worn replace it 3 Check the thrust plate 4 for scratches and excessive wear If it is worn or scored replace it 4 Check the cradle b...

Page 249: ...ith vernier calipers 2 If the thickness is less than the allowable limit replace it Thickness of PTO clutch disc Factory specifi cation 1 50 to 1 70 mm 0 0591 to 0 0669 in Allowable limit 1 35 mm 0 0531 in 6 2 3 Checking separate plate and back plate wear 1 Measure the thickness of pressure plate and steel back with vernier calipers 2 If the thickness is less than the allowable limit replace it Th...

Page 250: ... free length Factory specifi cation 38 5 mm 1 52 in Allowable limit 34 5 mm 1 36 in 6 2 6 Checking PTO brake disc wear 1 Measure the PTO brake disc thickness with a vernier caliper 2 If the thickness is less than allowable limit replace it PTO brake disc thickness Factory specifi cation 2 90 to 3 10 mm 0 115 to 0 122 in Allowable limit 2 70 mm 0 11 in 6 2 7 Checking PTO brake plate 1 Measure the P...

Page 251: ...earance Differential pinion I D Factory specifi cation 20 060 to 20 081 mm 0 78977 to 0 79059 in 3 If the clearance exceeds the allowable limit replace damaged parts Clearance be tween differential pinion shaft and differential pinion Factory specifi cation 0 0800 to 0 122 mm 0 00315 to 0 00480 in Allowable limit 0 30 mm 0 012 in 6 2 10 Checking backlash between differential pinion and differentia...

Page 252: ...n spiral bevel pinion and bevel gear Factory specifi cation 0 10 to 0 30 mm 0 0040 to 0 011 in 6 2 12 Checking brake cam lever movement 1 Move the brake cam lever by hand to check its movement 2 If its movement is heavy refine the brake cam with a emery paper 6 2 13 Checking flatness of actuator and bearing holder 1 Place a straightedge on the contacting surface of the actuator and the bearing hol...

Page 253: ...s found replace it 6 2 15 Checking brake disc and friction plate wear 1 Measure the brake disc thickness and the friction plate thickness with an outside micrometer 2 If the thickness is less than the allowable limit replace it Brake disc thick ness Factory specifi cation 3 30 to 3 50 mm 0 130 to 0 137 in Allowable limit 3 0 mm 0 12 in Friction plate thick ness Factory specifi cation 1 92 to 2 08 ...

Page 254: ...4 TRANSAXLE SERVICING 6 Servicing 4 64 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 255: ...5 FRONT AXLE KiSC issued 03 2019 A ...

Page 256: ...evel gears 18 3 then the power is transmitted to the axle 1 The differential system allows each wheel to rotate at a different speed to make turning easier 1 Axle 2 Axle flange 3 Bevel gear 4 Bevel gear 5 Bevel gear case 6 Bevel gear 7 Differential yoke shaft R H 8 Front axle case 9 Bevel pinion shaft 10 Differential gear assembly 11 Differential pinion shaft 12 Differential yoke shaft L H 13 Diff...

Page 257: ... any shimmy motion of the steering wheel It also reduces steering effort Kingpin angle 0 209 rad 12 2 3 Caster of front axle The kingpin is titled forward as viewed from the side The point b of the wheel center line is behind the point a of the kingpin shaft center line This inclination is called caster c Caster helps provide steering stability As with the kingpin inclination caster reduces steeri...

Page 258: ...F Front R Rear MECHANISM 2 Front wheel alignment 5 FRONT AXLE BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 5 3 KiSC issued 03 2019 A ...

Page 259: ...5 FRONT AXLE MECHANISM 2 Front wheel alignment 5 4 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 260: ...ircuit Bleed Front wheels cannot be driven 1 Front wheel driving gears in front axle gear case broken Replace 5 14 2 Universal joint broken Replace 5 11 3 Front wheel drive gears in transmission broken Replace 4 Front differential gear broken Replace 5 15 Noise 1 Gear backlash excessive Adjust or replace 5 16 5 17 2 Oil insufficient Fill 5 9 3 Bearings damaged or broken Replace 4 Gears damaged or ...

Page 261: ...9 960 to 9 975 mm 0 3922 to 0 3927 in Differential pinion O D 10 000 to 10 015 mm 0 39370 to 0 39429 in Differential pinion to differential side gear Backlash 0 1 to 0 3 mm 0 004 to 0 01 in Bevel pinion shaft Turning torque 0 80 to 1 0 N m 0 082 to 0 10 kgf m 0 59 to 0 73 lbf ft Bevel pinion shaft to bevel gear Backlash 0 1 to 0 3 mm 0 004 to 0 01 in 12T bevel gear to 15T bevel gear Backlash 0 1 t...

Page 262: ...ng screw 48 to 55 4 9 to 5 7 36 to 41 Power steering hose 24 to 27 2 4 to 2 8 18 to 20 Bevel gear case mounting screw M10 48 to 55 4 9 to 5 7 36 to 41 Bevel gear case mounting screw M12 78 to 90 7 9 to 9 2 58 to 66 Front gear case cover mounting screw 48 to 55 4 9 to 5 7 36 to 41 RELATED PAGE TIGHTENING TORQUES on page 2 13 SERVICING 3 Tightening torques for front axle 5 FRONT AXLE BX1880 BX2380 B...

Page 263: ...r and remove the front wheel 2 Set a spring balance to the front gear case cover 3 Measure the front axle rocking force 4 If the measurement is not within the factory specifications adjust as following Front axle rocking force Factory specifi cation 49 1 to 117 N 5 00 to 12 0 kgf 11 1 to 26 4 lbf Adjusting procedure 1 Remove the cotter pin 1 2 Tighten or loosen the adjusting nut 2 so that the meas...

Page 264: ...1 Separating front axle assembly 5 1 1 Draining front axle case oil 1 Breather plug 2 Filling plug with dipstick 3 Drain plug A Oil level is acceptable within this range 1 Place the oil pans underneath the front axle case 2 Remove both right and left hand side drain plugs 3 and filling plug 2 to drain the oil 3 After draining reinstall the drain plugs 3 When reassembling IMPORTANT After a few minu...

Page 265: ...5 R H bonnet bracket 3 Open the bonnet 4 Disconnect the headlight harness from the headlights and bonnet 5 Disconnect the bonnet guide rod 3 from the bonnet 6 Disconnect the L H and R H bonnet brackets 4 5 from the frame 7 Remove the bonnet 6 6 Bonnet 5 1 4 Removing front wheel and propeller shaft cover 1 Lift up the front of tractor and place the disassembling stand under the front axle frame 2 R...

Page 266: ...le assembly 1 Remove the power steering hose clamp 1 1 Hose clamp 2 Place the garage jack under the front axle 3 Remove the cotter pin 3 4 Remove the slotted nut 2 of center pin and separate the front axle from the frame 2 Slotted nut Adjusting nut for front axle rocking force 3 Cotter pin 5 Disconnect the power steering hoses 4 4 Power steering hose When reassembling After mounting the front axle...

Page 267: ...m 4 9 to 5 7 kgf m 36 to 41 lbf ft 5 2 2 Removing bevel gear case and front gear case 1 Remove the bevel gear case mounting screws 2 Remove the bevel gear case 2 and front gear case 1 as a unit from the front axle case 3 1 Front gear case 2 Bevel gear case 3 Front axle case When reassembling Apply grease to the O ring and be careful not to damage it Do not interchange right and left bevel gear cas...

Page 268: ... Tap out the axle shaft 2 When reassembling Install the oil seal 6 of front gear case cover 1 noting its direction as shown in the figure 1 Front gear case cover 2 Axle shaft 6 Oil seal 5 2 5 Removing front gear case and bevel gear case 1 Internal circlip 2 Shim 3 Ball bearing 4 Bevel gear 5 Bevel gear case 6 Front gear case 7 External circlip 8 Bevel gear shaft 9 Ball bearing 10 Internal circlip ...

Page 269: ... R H 8 Adjusting collar 9 Taper roller bearing 10 Lock nut 11 Oil seal 12 Collar 1 Remove the differential yoke shaft 4 7 2 Remove the oil seal 11 3 Remove the internal circlip 1 4 Pull out the bevel pinion shaft 3 5 Remove the differential gear assembly 5 from right side of front axle case 6 6 Remove the stake of lock nut 10 and then remove the lock nut 10 7 Remove the taper roller bearing 9 When...

Page 270: ...l case bore I D Factory specifi cation 26 000 to 26 021 mm 1 0237 to 1 0244 in 3 Measure the differential case cover bore I D and calculate the clearance 4 If the clearance exceeds the allowable limit replace damaged parts Clearance be tween differential case and differen tial side gear Factory specifi cation 0 040 to 0 082 mm 0 0016 to 0 0032 in Allowable limit 0 17 mm 0 0067 in 6 2 Checking clea...

Page 271: ...r 0 80 mm 0 031 in 1 0 mm 0 039 in 1 2 mm 0 047 in For pinion 3 30 mm 0 130 in 3 50 mm 0 138 in 3 70 mm 0 146 in 3 90 mm 0 154 in 6 4 Checking turning torque of bevel pinion shaft 1 Clamp the spiral bevel pinion shaft assembly to the vise and tighten the staking nut 2 Measure the turning torque of bevel pinion shaft 3 If the turning torque is not within the factory specifications adjust with the l...

Page 272: ... 0 01 in Reference Thickness of adjusting collars 3 4 3 40 mm 0 134 in 3 60 mm 0 142 in 3 80 mm 0 150 in 3 90 mm 0 154 in 4 00 mm 0 157 in 4 10 mm 0 161 in 4 20 mm 0 165 in 4 40 mm 0 173 in 4 50 mm 0 177 in 4 60 mm 0 181 in 5 Adjust the backlash properly by repeating the above procedures 6 6 Checking backlash between 12T bevel gear and 15T bevel gear 1 15T bevel gear 2 12T bevel gear 3 Shim 1 Stic...

Page 273: ...r pin O D with an outside micrometer Center pin O D Factory specifi cation 19 850 to 20 000 mm 0 78150 to 0 78740 in 2 Measure the pin support bush I D of the front axle with a cylinder gauge Bush I D Factory specifi cation 20 000 to 20 081 mm 0 78741 to 0 79059 in 3 If the clearance exceeds the allowable limit replace it Clearance be tween center pin and pin support bush Factory specifi cation 0 ...

Page 274: ...6 STEERING KiSC issued 03 2019 A ...

Page 275: ... connected to the steering cylinder 2 with only the hydraulic hoses This steering is actuated by oil pressure Accordingly it does not have mechanical transmitting parts such as steering gear pitman arm drag link etc Therefore it is simple in construction 1 Hydraulic pump 2 Steering cylinder 3 Steering controller MECHANISM 1 Structure of steering system 6 STEERING BX1880 BX2380 BX2680 RCK60B 23BX R...

Page 276: ...cessive flow to the control valve of the implement lift circuit The oil that is supplied to the steering system gets transferred to the steering controller When the steering wheel is turned the steering controller then transfers oil to the steering cylinder 1 Steering controller 2 Steering cylinder 3 Flow priority valve 4 Hydraulic control valve as sembly 5 Hydraulic pump 6 Oil strainer A To PTO c...

Page 277: ...eering wheel 7 Spool 8 Centering spring 9 Sleeve A Control valve 3 1 2 Metering device 3 1 2 1 Structure of metering device Oil sent from the hydraulic pump to the steering cylinder passes through the metering device Namely when the rotor is driven two chambers suck in oil due to volumetric change in the pump chambers formed between the rotor 12 and the stator 13 while oil is discharged from other...

Page 278: ... power steering system 3 1 3 2 Specification of relief valve The setting pressure for the relief valve is as follows Relief valve Operating pres sure 8 33 to 8 83 MPa 85 to 90 kgf cm2 1209 to 1280 psi 6 STEERING MECHANISM 3 Steering controller 6 4 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 279: ... front axle and connected to tie rods The tie rods connected to both knuckle arm guarantees equal steering movement to both front wheels The steering cylinder provides force in both directions Depending upon direction the steering wheel is turned pressure oil enters at one end of the cylinder to extend or the other end to retract it thereby turning front wheel of the tractor MECHANISM 4 Steering c...

Page 280: ...6 STEERING MECHANISM 4 Steering cylinder 6 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 281: ...cuit Repair Steering wheel turns spontane ously when released 1 Steering controller malfunc tioning Replace 6 13 Front wheels wander to right or left 1 Steering controller malfunc tioning Replace 6 13 2 Air sucked in pump due to lack of oil Fill 2 34 3 Air sucked in pump from suc tion circuit Repair 4 Insufficient bleeding Bleed 5 Cylinder malfunctioning Repair or replace 6 12 6 Improper toe in ad...

Page 282: ...f oil Fill 2 34 2 Air sucked in pump from suc tion circuit Repair 3 Pipe deformed Replace Oil temperature increases rapidly 1 Steering controller relief valve malfunctioning Replace 6 13 6 STEERING SERVICING 6 8 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 283: ...ering cylinder Item Factory specification Allowable limit Steering cylinder I D 40 000 to 40 062 mm 1 5748 to 1 5772 in 40 100 mm 1 5787 in Piston rod to guide Clearance 0 020 to 0 070 mm 0 00079 to 0 0027 in 0 200 mm 0 00787 in SERVICING 2 Servicing specifications for steering 6 STEERING BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 6 9 KiSC issued 03 2019 A ...

Page 284: ...steering hose 24 to 27 2 4 to 2 8 18 to 20 Power steering cylinder mounting screw 48 to 55 4 9 to 5 7 36 to 41 Tie rod slotted nut 18 to 34 1 8 to 3 5 13 to 25 Tie rod screw 74 to 84 7 5 to 8 6 55 to 62 RELATED PAGE TIGHTENING TORQUES on page 2 13 6 STEERING SERVICING 3 Tightening torques for steering 6 10 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 0...

Page 285: ... operation force Operation force Steering wheel Approximate 9 8 N 1 0 kgf 2 2 lbf Relief valve oper ating pressure Factory specifi cation 8 34 to 8 82 MPa 85 0 to 90 0 kgf cm2 1210 to 1280 psi 5 Disassembling and assembling 5 1 Power steering cylinder 5 1 1 Removing adapter and tie rod 1 Cylinder holder 2 Tie rod R H 3 Internal circlip 4 Hose adapter R H 5 Cylinder 6 Hose adapter L H 7 Piston rod ...

Page 286: ...ittle screwdriver or another tool 5 Push out the piston rod assembly 9 and take off the guide assembly 3 When reassembling NOTE Seals must be exchanged after disassembling Apply transmission fluid to the exchanged seals Enter the piston rod and block the guide assemblies with the circlips 5 2 Separating power steering controller 5 2 1 Removing battery WARNING To avoid serious injury or death When ...

Page 287: ... accelerator lever grip 1 cruise control lever knob 3 and tilt lever grip 4 1 Hand accelerator lever grip 2 Main switch 3 Cruise control lever knob 4 Tilt lever grip 5 Combination switch 6 Bolt 7 Upper panel 3 Open the bonnet and remove the upper panel mounting bolts 6 4 Remove the upper panel 7 5 2 4 Removing steering controller 1 Disconnect the power steering hoses 3 4 5 6 from the steering cont...

Page 288: ...se 24 to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft 5 3 Separating power steering cylinder 5 3 1 Removing bonnet 1 Remove the mower deck 2 Remove the front link 1 and link brackets 2 1 Front link 2 Front link bracket 3 Bonnet guide rod 4 L H bonnet bracket 5 R H bonnet bracket 3 Open the bonnet 4 Disconnect the headlight harness from the headlights and bonnet 5 Disconnect the bonnet guide rod 3 from ...

Page 289: ...to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft 5 3 3 Removing power steering cylinder 1 Tie rod 2 Power steering cylinder 1 Remove the cotter pin and remove the slotted nut for tie rod 1 2 Remove the power steering cylinder mounting screws and remove the power steering cylinder 2 with tie rod When reassembling NOTE Tighten the slotted nut If the slot and pin hole do not meet tighten the nut until they...

Page 290: ...6 2 Checking clearance between rod and guide 1 Measure the rod guide I D with a cylinder gauge 2 Measure the rod O D with an outside micrometer and calculate the clearance 3 If the clearance exceeds the allowable limit replace as a unit Clearance be tween rod and guide Factory specifi cation 0 020 to 0 070 mm 0 00079 to 0 0027 in Allowable limit 0 200 mm 0 00787 in 6 STEERING SERVICING 6 Servicing...

Page 291: ...7 HYDRAULIC SYSTEM KiSC issued 03 2019 A ...

Page 292: ...nd power steering 1 Power steering controller 2 Front loader control valve 3 Hydraulic block 4 Flow priority valve 5 Hydraulic pump 6 Hydrostatic transmission HST 7 Steering cylinder MECHANISM 1 Structure of hydraulic system 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 1 KiSC issued 03 2019 A ...

Page 293: ...power steering controller PTO clutch valve and hydrostatic transmission after dividing oil flow by flow priority valve 1 Hydraulic pump 2 Hydraulic oil filter 3 Charge relief valve 4 Check and high pressure relief valve 5 Hydrostatic transmission 6 Relief valve 7 Hydraulic oil filter 8 PTO clutch relief valve 9 PTO clutch relief valve 10 PTO clutch 11 Flow priority valve 12 Power steering relief v...

Page 294: ... to 7 7 kgf cm2 80 to 100 psi 4 20 1 to 21 1 MPa 205 to 215 kgf cm2 2920 to 3060 psi 8 1 0 to 1 3 MPa 11 to 13 kgf cm2 150 to 180 psi 12 8 34 to 8 82 MPa 85 0 to 90 0 kgf cm2 1210 to 1280 psi MECHANISM 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 3 KiSC issued 03 2019 A ...

Page 295: ...splacement Engine speed Condition 23 5 L min 6 2 U S gals min 5 2 Imp gals min At 3200 min 1 rpm At no load 4 Control valve 4 1 Outline of control valve This position control valve is located under the hydraulic cylinder This control valve is mechanically connected to the position control lever Since the feedback rod is not equipped to the lift arm the neutral position adjustment is adjusted by co...

Page 296: ...nd C port Since the oil in the hydraulic cylinder is not drained to T2 port neutral position is kept 1 Lift arm 2 Hydraulic cylinder 3 Control valve body 4 Spool 5 Lowering adjusting shaft P Pump port C Cylinder port T1 Tank port T2 Tank port MECHANISM 4 Control valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 5 KiSC issued 03 2019 A ...

Page 297: ...ture oil passes slowly through the gap between the control valve body 3 and the spool 4 to C port In this tractor when you set the control lever to the slow up implement lifts up with ease in increments of approximately 1 4 inches at lower link end 1 Lift arm 2 Hydraulic cylinder 3 Control valve body 4 Spool 5 Lowering adjusting shaft P Pump port C Cylinder port T1 Tank port T2 Tank port 7 HYDRAUL...

Page 298: ...he implement lowers Since the spool shape is step down structure oil pass slowly from C port through the gap between the control valve body 3 and the spool 4 to T2 port In this tractor when you set the control lever to the slow down position implement lowers down with ease in increments of approximately 1 4 inches at lower link end 1 Lift arm 2 Hydraulic cylinder 3 Control valve body 4 Spool 5 Low...

Page 299: ...e transmission The flow priority valve is a flow divider that divides a single hydraulic source hydraulic pump into two circuits and actuates them simultaneously 7 HYDRAULIC SYSTEM MECHANISM 5 Flow priority valve 7 8 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 300: ...se 3 Plug 4 Flow priority valve 5 Relief valve EF EF port to 3 point hitch con trol circuit PF PF port to power steering PTO clutch and HST circuit P Pump port Suction T Tank port MECHANISM 5 Flow priority valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 9 KiSC issued 03 2019 A ...

Page 301: ...lief valve 6 1 Outline of relief valve This relief valve is located on the left side of transmission The implement control system circuit has a relief valve to restrict the maximum pressure in the circuit The relief valve is a guide piston type with damping effect 7 HYDRAULIC SYSTEM MECHANISM 5 Flow priority valve 7 10 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX ...

Page 302: ... piston The inlet of the valve leads to the chamber via a clearance between the sliding portion of the guide and the seat 6 minimizing valve vibration with the damping effect of the chamber 1 Hydraulic pump gear 2 Hydraulic pump case 3 Plug 4 Flow priority valve 5 Relief valve 6 Seat 7 Poppet EF EF port to 3 point hitch con trol circuit PF PF port to power steering PTO clutch and HST circuit DC Da...

Page 303: ...e spring force the valve opens Oil then flows out to the transmission case through T port preventing any further rise in pressure The valve closes again when enough oil is released to drop pressure below the valve setting 1 Hydraulic pump gear 2 Hydraulic pump case 3 Plug 4 Flow priority valve 5 Relief valve EF EF port to 3 point hitch con trol circuit PF PF port to power steering PTO clutch and H...

Page 304: ...Relief valve set ting pressure Engine speed Oil temperature 12 3 to 12 7 MPa 125 to 130 kgf cm2 1780 to 1840 psi Maximum 40 to 50 104 to 122 MECHANISM 6 Relief valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 13 KiSC issued 03 2019 A ...

Page 305: ...o the hydraulic cylinder 11 Turning the lowering speed adjusting knob clockwise decreases the lowering speed and counterclockwise increases lowering speed When the lowering speed adjusting valve is completely closed the lift arm 1 is held at its position since oil in the hydraulic cylinder is sealed between the piston 5 and ball 7 1 Lift arm 2 Hydraulic arm 3 Hydraulic arm shaft 4 Hydraulic rod 5 ...

Page 306: ...sembly This hydraulic block type outlet is provided to use power from the tractor to operate the hydraulic cylinders on the implement such as front end loader front snow blade and other implements 1 Block cover 2 Hydraulic cylinder P P port Pump P B P B port Power beyond T T port Tank MECHANISM 8 Hydraulic block type outlet 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX ...

Page 307: ...ard As a result mower rear link 1 is lifted The cutting height adjusting dial 3 adjusts cutting height of mower by rotating the adjusting cam 7 The position of mower rear link 1 is adjusted by changing the length of the adjusting bolt 6 1 Mower rear link 2 Mower lift arm 3 Cutting height adjusting dial 4 Lift bracket 5 Lift arm 6 Adjusting bolt 7 Cam 8 Lift pin 7 HYDRAULIC SYSTEM MECHANISM 9 Mower...

Page 308: ...e 5 Pipe Return 6 Hydraulic outlet Block type 7 Pipe 1A for boom cylinder 8 Pipe 1B for boom cylinder 9 Pipe 2B for bucket cylinder 10 Pipe 2A for bucket cylinder 11 Front loader control valve MECHANISM 10 Front loader valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 17 KiSC issued 03 2019 A ...

Page 309: ...sition 6 connection no detent spring center type consisting of a mono block valve housing spool load check valve etc This valve has A2 and B2 ports and controls oil flow to the bucket cylinder Inlet P port and outlet T port section This section has P and T ports The P port is connected to the outlet port of hydraulic block by the hydraulic pipe The T port is connected to the tank port of hydraulic...

Page 310: ... 3 Boom control valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P Pump port PB Power beyond port T Tank port a To hydraulic block MECHANISM 10 Front loader valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 7 19 KiSC issued 03 2019 A ...

Page 311: ...al 1 Front loader control valve 2 Bucket spool valve 3 Boom spool valve 4 Plug Bucket control 5 Detent plug Boom control 6 Check valve 7 Boom cylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 20 BX1880 BX2380 BX2680 ...

Page 312: ...e pressured oil is delivered to the boom cylinder 7 through 1B port 1B This extends and raises the boom cylinder 2 When the boom spool valve 3 moves outward a passage between the boom spool valve 3 and 1A port 1A is created The return oil from the boom cylinder enters 1A port 1A flows through the bucket spool valve 2 and exits to PB port PB MECHANISM 10 Front loader valve 7 HYDRAULIC SYSTEM BX1880...

Page 313: ...ylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure b High pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 22 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 314: ...sage The pressured oil is delivered to the boom cylinder 7 through 1A port 1A This retracts and lowers the boom cylinder 2 When the boom spool valve 3 moves inward a passage between the boom spool valve 3 and 1B port 1B is created The return oil in the boom cylinder enters 1B port 1B flows to the bucket spool valve 2 and exits to the PB port PB MECHANISM 10 Front loader valve 7 HYDRAULIC SYSTEM BX...

Page 315: ...cylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure b High pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 24 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 316: ...port P flows through the bucket spool valve 2 and exits to the PB port PB 3 The low pressured return oil in the boom cylinder enters 1A port 1A flows through the boom spool valve 3 and goes to the tank port T The other low pressured return oil in the boom cylinder enters 1B port 1B flows through the boom spool valve 3 and goes to the tank port T As a result the boom is floating MECHANISM 10 Front ...

Page 317: ...m cylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure b High pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 26 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 318: ... from the pump port P flows through 2B port 2B to the bucket cylinder 3 The low pressured return oil from the bucket cylinder enters 2A port 2A flows through the front loader control valve 1 and goes to the tank port T As a result the bucket moves to roll back position MECHANISM 10 Front loader valve 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX ...

Page 319: ...m cylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure b High pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 28 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 320: ...rol section As the passage to the PB port PB is closed by the bucket spool valve 2 the arriving oil opens the load check valve 9 and flows to 2A port 2A through the notched section of the bucket spool valve 2 This extends the bucket cylinder 8 3 Return oil from the bucket cylinder 8 enters 2B port 2B and travels throughout the valve to go to the transmission case through T port T MECHANISM 10 Fron...

Page 321: ...cylinder 8 Bucket cylinder 9 Check valve 1A 1A port 1B 1B port 2A 2A port 2B 2B port P From hydraulic pump PB To 3 point hydraulic system T To tank transmission case a Low pressure b High pressure 7 HYDRAULIC SYSTEM MECHANISM 10 Front loader valve 7 30 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 322: ...r replace 3 Suction pipe connecting hose loosen or broken Repair or replace 4 Suction pipe O ring broken Replace 5 Insufficient transmission oil Refill 2 34 6 Relief valve setting pressure too low Adjust or replace 7 34 7 Hydraulic pump broken Replace Implement does not lower 1 Control valve malfunctioning Repair or replace 7 44 Implement drops by its weight 1 Hydraulic cylinder worn or damaged Re...

Page 323: ...to 33 530 mm 1 3197 to 1 3200 in Case I D 33 570 to 33 577 mm 1 3217 to 1 3219 in Gear shaft to bushing Clearance 0 020 to 0 091 mm 0 00079 to 0 0035 in 0 12 mm 0 0047 in Gear shaft O D 14 970 to 14 980 mm 0 58937 to 0 58976 in Bushing I D 15 000 to 15 061 mm 0 59056 to 0 59295 in Side plate Thickness 2 48 to 2 50 mm 0 0977 to 0 0984 in 2 40 mm 0 094 in Hydraulic cylinder I D 80 05 to 80 15 mm 3 1...

Page 324: ...15 0 91 2 to 108 Hydraulic cylinder block mounting bolt 40 to 44 4 0 to 4 5 29 to 32 Hydraulic pump mounting bolt M6 7 9 to 9 3 0 80 to 0 95 5 8 to 6 8 Hydraulic pump mounting bolt M8 18 to 20 1 8 to 2 1 13 to 15 RELATED PAGE TIGHTENING TORQUES on page 2 13 SERVICING 3 Tightening torques for hydraulic system 7 HYDRAULIC SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK5...

Page 325: ...cifications adjust with the adjusting shim 5 4 Relief valve 5 Shim Relief valve setting pressure Factory specifi cation 12 3 to 12 7 MPa 125 to 130 kgf cm2 1780 to 1840 psi Reference Thickness of shim 5 0 1 mm 0 004 in 0 2 mm 0 008 in 0 4 mm 0 02 in 0 269 MPa 2 74 kgf cm2 39 0 psi pressure is increased whenever the thickness of adjusting shim is increased by 0 1 mm 0 004 in 4 2 Pump and priority v...

Page 326: ...the flow meter hose and the flowmeter outlet 5 If the flow volume is insufficient replace the pump Reference Pump oil flow Hydraulic pump delivery at no pressure Factory specifi cation Above 24 9 L min 6 6 U S gals min 5 5 Imp gals min 6 After measuring the flow volume remove the flow meter then reassembling the hydraulic pipe to the original position 4 2 2 Checking power steering oil flow IMPORTA...

Page 327: ...Factory specifi cation Above 8 0 L min 2 1 U S gals min 1 8 Imp gals min Engine speed Specification 1500 min 1 rpm 6 After measuring the flow volume remove the flow meter then reassemble the hydraulic pipe to the original position 4 3 Mower lift linkage 4 3 1 Adjusting mower lift linkage After reassembling the mower lift linkage be sure to adjust it as follows 1 Nut 2 Bolt A Upper view L1 Length L...

Page 328: ...connect the negative cable 3 from the battery 2 3 Disconnect the positive cable 4 from the battery 2 and remove the battery 2 Battery 3 Negative cable 4 Positive cable 5 1 2 Removing lift rod and lower link 1 Remove the top link 2 2 Remove the stopper pin 6 and remove the check chain plate 3 1 Lift rod L H 2 Top link 3 Check chain plate 4 Lift rod R H 5 Lower link R H 6 Stopper pin 7 Lower link L ...

Page 329: ...cruise control rod 2 Remove the R H and L H side covers 2 7 1 Upper cruise control rod 2 R H side cover 3 Step mat 4 Step 5 Forward HST pedal 6 Reverse HST pedal 7 L H side cover 3 Remove the step mat 3 4 Remove the forward and reverse HST pedals 5 6 5 Remove the step 4 5 1 6 Removing fender 1 Disconnect the L H and R H tail lamps 3 7 from the wire harness 2 Disconnect the 12 V outlet 2 from the w...

Page 330: ...e 8 6 Remove the seat stopper 3 7 Remove the R H and L H fuel tank stays 9 and cushions 10 then remove the fuel tank 5 9 R H fuel tank stay 10 Cushion When reassembling Tightening tor que Fuel tank stay mounting bolt and nut 48 to 55 N m 4 9 to 5 7 kgf m 36 to 41 lbf ft Seat stopper bolts 123 5 to 147 0 N m 12 6 to 15 0 kgf m 91 2 to 108 lbf ft 5 1 8 Removing fender center stay 1 Remove the fender...

Page 331: ...pump mounting bolt M8 18 to 20 N m 1 8 to 2 1 kgf m 13 to 15 lbf ft 5 2 Hydraulic cylinder block 5 2 1 Removing battery WARNING To avoid serious injury or death When disconnecting the battery cables disconnect the negative cable from the battery first When connecting connect the positive cable to the battery first 1 Remove the under panel 1 1 Under panel 2 Disconnect the negative cable 3 from the ...

Page 332: ...r ROPS 2 R H lower ROPS 3 R H hazard lamp turn signal 4 L H hazard lamp turn signal 5 L H lower ROPS 6 Bolt 3 Remove the ROPS mounting bolts 6 4 Remove the R H and L H lower ROPS 2 5 When reassembling Tightening torque ROPS mount ing bolt 48 0 to 55 9 N m 4 90 to 5 70 kgf m 35 5 to 41 2 lbf ft 5 2 4 Removing seat 1 Disconnect the seat switch connectors 2 Remove the snap pins 2 to remove the seat 1...

Page 333: ...l lock pedal cover 4 cutting height adjusting dial knob 5 and lower speed adjusting knob 6 5 Remove the R H lever grips 7 6 Remove the R H lever guide 8 and R H handrail 10 7 Remove the L H lever guide stay nut 8 R H lever guide 9 Fender 10 R H handrail 8 Remove the fender 9 5 2 7 Removing fuel tank 1 Remove the and R H lever guide stay 1 2 Drain the fuel from the fuel tank 3 Disconnect the fuel s...

Page 334: ...lt and nut M14 98 0 to 125 N m 11 0 to 12 8 kgf m 79 6 to 92 5 lbf ft Fender center stay mounting bolt and nut M10 39 2 to 45 1 N m 4 00 to 4 60 kgf m 29 0 to 33 2 lbf ft 5 2 9 Removing mower linkage and wire harness 1 Disconnect the mower linkage 2 2 Remove the wire harness clamp and wire harness 1 from the hydraulic cylinder block 1 Wire harness 2 Mower linkage 5 2 10 Removing hydraulic cylinder...

Page 335: ...l valve 2 Spool 3 Plain washer 4 Internal circlip 1 Remove the control valve 1 1 Control valve 2 Remove the internal circlip 4 and draw out the spool 2 5 3 2 Removing control valve lever 1 Pin 2 Arm 3 Control valve lever 1 Pull out the pin 1 2 Remove the control valve lever 3 and arm 2 7 HYDRAULIC SYSTEM SERVICING 5 Disassembling and assembling 7 44 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK4...

Page 336: ... 1 Hydraulic piston 2 Back up ring 3 O ring 1 Inject the compressed air into the hydraulic cylinder and remove the hydraulic piston 1 1 Hydraulic piston When reassembling Be careful not to damage the O ring 3 and back up ring 2 Apply transmission fluid to the O ring Replace the O ring if it is damaged worn or scratched which may cause oil leakage 5 3 5 Removing lowering speed adjusting valve 1 Spr...

Page 337: ...he lift link rear L H 7 2 Remove the pin and remove the mower rear links 1 8 3 Remove both side of boss and remove the lift link rear R H 2 4 Remove the cutting height adjusting dial knob 3 5 Remove the nut and remove the adjusting cam 9 and cutting height adjusting rod 4 When reassembling Adjust the length of the link adjusting bolt 7 HYDRAULIC SYSTEM SERVICING 5 Disassembling and assembling 7 46...

Page 338: ...3 4 from the wire harness 2 Remove the upper ROPS 1 1 Upper ROPS 2 R H lower ROPS 3 R H hazard lamp turn signal 4 L H hazard lamp turn signal 5 L H lower ROPS 6 Bolt 3 Remove the ROPS mounting bolts 6 4 Remove the R H and L H lower ROPS 2 5 When reassembling Tightening torque ROPS mount ing bolt 48 0 to 55 9 N m 4 90 to 5 70 kgf m 35 5 to 41 2 lbf ft 5 5 3 Removing seat 1 Disconnect the seat switc...

Page 339: ... knob 7 R H lever grip 4 Remove the differential lock pedal cover 4 cutting height adjusting dial knob 5 and lower speed adjusting knob 6 5 Remove the R H lever grips 7 6 Remove the R H lever guide 8 and R H handrail 10 7 Remove the L H lever guide stay nut 8 R H lever guide 9 Fender 10 R H handrail 8 Remove the fender 9 5 5 6 Removing control valve 1 Disconnect the hydraulic hoses 2 2 Disconnect ...

Page 340: ...y 28 Valve body 1 Remove the load check valve assemblies 27 2 Remove the detent plug assembly 13 and plug 14 3 Remove the bucket spool 1 with parts 15 to 22 from the valve body 28 4 Remove the boom spool 2 with parts 3 to 12 from the valve body When reassembling Clean all parts with a suitable solvent and dry with a lint free cloth or air Visually inspect all parts for damage When installing the s...

Page 341: ... retaining ring 3 3 Hold the hydraulic pipe 1 with a wrench and tighten the cartridge with the cartridge socket in the sequence shown a Tighten the cartridge by hand until finger tight b Tighten the cartridge 2 to 3 turns using cartridge socket RELATED PAGE 2 6 Quick coupler cartridge socket on page 2 67 6 Servicing 6 1 Hydraulic pump 6 1 1 Checking clearance between tip of gear tooth and casing 1...

Page 342: ...ickness 1 Measure the side plate thickness with an outside micrometer 2 If the thickness is less than the allowable limit replace it Side plate thick ness Factory specifi cation 2 48 to 2 50 mm 0 0977 to 0 0984 in Allowable limit 2 40 mm 0 094 in 6 2 Hydraulic cylinder 6 2 1 Checking hydraulic cylinder bore 1 Check the cylinder internal surface for scoring or damage 2 Measure the cylinder I D with...

Page 343: ...1 1791 in 1 Visually inspect the DX bushings for signs of wear or damage The DX bushing tends to show concentrated wear 2 If the DX bushing is worn beyond the alloy thickness A replace it Reference Hydraulic arm shaft bushing Alloy thickness A 0 57 mm 0 022 in 7 HYDRAULIC SYSTEM SERVICING 6 Servicing 7 52 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03...

Page 344: ...8 ELECTRICAL SYSTEM KiSC issued 03 2019 A ...

Page 345: ...CHANISM 1 Wiring diagram of BX tractor MECHANISM 1 Wiring diagram of BX tractor 8 ELECTRICAL SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 8 1 KiSC issued 03 2019 A ...

Page 346: ...2 Electrical connector chart 8 ELECTRICAL SYSTEM MECHANISM 2 Electrical connector chart 8 2 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 347: ...or Black Red Wire color page e Unit symbol Relay Unit symbol page f Pin name Coil g Pin No 1 h Connector name Starter relay Connector diagram j Wire number 30 A Color of wiring a Wire size mm2 b Insulation base color c Stripe color Ex 1 25 Y R means 1 25 Wire size mm2 Y Base color yellow R Stripe color red MECHANISM 3 Reading electrical circuit diagrams 8 ELECTRICAL SYSTEM BX1880 BX2380 BX2680 RCK...

Page 348: ...nk P Red R White W Yellow Y Brown Br Gray Gy Light green Lg Orange Or Sky blue Sb 8 ELECTRICAL SYSTEM MECHANISM 3 Reading electrical circuit diagrams 8 4 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 349: ... NPN transistor 17 Semiconductor diode 18 Light emitting diode LED 19 Two way breakdown diode 20 Coil 21 a Contact 22 Auto resetting b Contact 23 Auto resetting a Contact 24 Relay coil 25 Fuse 26 Lamp 27 Buzzer 28 Horn 29 Speaker 30 AC voltage source 31 Switch 32 Off No auto reset 33 On 34 Start Auto reset A New symbol B Old symbol MECHANISM 3 Reading electrical circuit diagrams 8 ELECTRICAL SYSTE...

Page 350: ... start from 1 in the top right corner looking at the connecting face Male connector terminal numbers start from 1 in the top left corner A Female connector terminal B Male connector terminal C Not waterproof D Waterproof 8 ELECTRICAL SYSTEM MECHANISM 3 Reading electrical circuit diagrams 8 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 351: ...before reassembling the connector and putting its plastic cover securely in place 3 Straighten any bent connector terminals and make sure none are sticking out or missing Also make sure there is no corrosion on the connector s terminals before connecting it 4 When connecting a locking connector be sure to press it in until you hear it click and then pull gently on the harness close to the connecto...

Page 352: ... the ON position the terminal BAT is connected only to the terminal GLOW thereby causing the starting circuit to be opened stopping the starter motor When the main switch turned from the ON position to the OFF position the fuel cut off solenoid moves the fuel injection pump control rack to the no fuel injection position and stops the engine The OPC timer equipped is the operator presence control O...

Page 353: ...hanical contact points 9 When current is applied to the winding energized 10 a magnetic field pushes the contact lever 8 and normally open terminal is connected 4 3 Function of starter 1 Front bracket 2 Drive lever 3 Magnetic switch 4 Pinion gear 5 Overrunning clutch 6 Gear shaft 7 Internal gear 8 Pinion gear 9 Armature shaft The reduction system is used planetary gears and the speed of gear shaft...

Page 354: ...g heated The ignition point is in the area of 2 to 3 mm 0 079 to 0 118 in from the tip of the plug in order to reduce its projection into the combustion chamber 4 5 Function of safety switch The safety switch is electrically closed in normal condition normally closed type The switch operates as sensor detecting and transmitting the position of HST pedal PTO lever independent PTO lever and seat to ...

Page 355: ... to the solenoid relay 8 is cut and the engine is stopped by function of the solenoid 9 1 Slow blow fuse 2 Main switch 3 Fuse 10 A 4 OPC timer 5 Seat switch from seat switch ON or OFF 6 Fuse 15 A 7 Battery 8 Engine stop solenoid timer re lay 9 Engine stop solenoid Seat switch The seat switch has two positions When the operator s seat is occupied the switch contact point is at ON position When the ...

Page 356: ...ging system 6 1 Electrical circuit for charging system 8 ELECTRICAL SYSTEM MECHANISM 6 Charging system 8 12 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 357: ...icates operated hours While the engine operates the tachometer indicates the present engine revolutions RY red yellow lead 2 is a lead to chassis WG white green lead 3 is a lead to the charge lamp 1 L blue lead 2 RY red yellow lead 3 WG white green lead 4 Alternator assembly 5 IC regulator 6 Load 7 Load A To the battery B To hour meter and tachome ter C To main switch D To charge indicator MECHANI...

Page 358: ...ting system 7 1 Electrical circuit for lighting system 8 ELECTRICAL SYSTEM MECHANISM 7 Lighting system 8 14 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 359: ...8 Gauges 8 1 Electrical circuit of gauge system MECHANISM 8 Gauges 8 ELECTRICAL SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 8 15 KiSC issued 03 2019 A ...

Page 360: ...gnal It changes and indicates the signal to the engine revolution in cooperation with the voltage 1 Tachometer A Yellow range B Orange range Implement Recommended engine speed PTO 540 Use within the yellow range A Loader Use within the orange range B 8 2 3 Function of fuel gauge The meter panel on this machine is equipped with a fuel gauge The fuel level gauge and fuel level sensor are connected b...

Page 361: ...nstalled in the fuel tank and indicated on the fuel gauge For detection a float and a resistor are used As the float lowers the resistance of the variable resistor varies E Empty F Full 8 4 Function of coolant temperature sensor The coolant temperature sensor is installed to the water pump housing and its tip is in touch with the coolant It contains a thermistor 4 whose electrical resistance decre...

Page 362: ...e is started and as the proper oil pressure builds the diaphragm 4 is pushed up This separates the contact rivet 5 and breaks the circuit causing the lamp to go out B At lower oil pressure 49 kPa 0 50 kgf cm2 7 1 psi or less If the oil pressure drops the resulting deflection of the diaphragm 4 will close the contact rivet 5 and again complete the circuit The lighted lamp warns that the pressure of...

Page 363: ...9 Others 9 1 Electrical circuit for accessory MECHANISM 9 Others 8 ELECTRICAL SYSTEM BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX 8 19 KiSC issued 03 2019 A ...

Page 364: ...he L H lever guide compartment The capacity of the outlet is 12 V 120 W Electrical device s such as an auxiliary light mobile phone battery charger or other 12 V components can be used with the outlet 1 DC outlet 8 ELECTRICAL SYSTEM MECHANISM 9 Others 8 20 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 365: ...Fuse blown frequently 1 Short circuited Repair or replace Battery Symptom Probable cause and checking procedure Solution Refer ence page Battery discharges too quickly 1 Battery damaged Replace 8 29 2 Alternator damaged Repair or replace 8 48 3 IC regulator damaged Replace 8 49 4 Wiring harness disconnected or improperly connected be tween battery positive terminal and regulator B terminal Repair ...

Page 366: ...erminal and starter motor Repair or replace 5 Starter motor damaged Repair or replace 8 47 6 Main switch damaged Replace 8 30 Engine does not stop when main switch is turned OFF 1 Fuse blown 15 A Replace 2 41 2 Wiring harness disconnected or improperly connected be tween main switch AC terminal and engine stop solenoid Repair or replace 8 1 3 Engine stop solenoid dam aged Replace 8 37 4 Timer rela...

Page 367: ...ace 2 41 2 Engine stop solenoid dam aged Replace 8 37 3 Engine stop solenoid relay damaged Replace 8 37 4 Seat switch or seat turnover switch damaged Adjust or replace 8 34 5 PTO shift lever switch dam aged Adjust or replace 8 33 6 HST pedal switch damaged Adjust or replace 8 34 7 Wiring harness disconnected or improperly connected be tween key stop solenoid relay and engine stop solenoid be tween...

Page 368: ...air or replace 8 1 3 Alternator damaged Repair or replace 8 48 4 IC regulator damaged Replace 8 49 Charging lamp does not go off when engine operates 1 Wiring harness disconnected or improperly connected be tween main switch 30 terminal and dynamo between panel board and alternator Repair or replace 8 1 2 Alternator damaged Repair or replace 8 48 3 IC regulator damaged Replace 8 49 8 ELECTRICAL SY...

Page 369: ...illumination light Repair or replace 8 1 Hazard lamp does not light 1 Fuse blown 15 A Replace 2 41 2 Bulb blown Replace 2 42 3 Wiring harness disconnected or improperly connected Repair or replace 8 1 4 Flasher unit damaged Replace 8 42 5 Hazard switch damaged Replace 8 38 Hazard indicator lamp does not light 1 Wiring harness disconnected or improperly connected Repair or replace 8 1 Hazard lamp d...

Page 370: ...epair 8 44 Oil pressure lamp does not light when main switch is turned ON and engine is not operating 1 Oil pressure switch damaged Replace 8 44 2 Wiring harness disconnected or improperly connected be tween panel board and oil pres sure switch Repair or replace 8 1 Gauges Symptom Probable cause and checking procedure Solution Refer ence page Fuel warning lamp does not light 1 Fuel gauge damaged R...

Page 371: ...nity Switch ON 0 Ω Starter Commutator O D 30 0 mm 1 181 in 29 0 mm 1 142 in Difference of O D s Less than 0 02 mm 0 0008 in 0 05 mm 0 0020 in Mica Undercut 0 50 to 0 80 mm 0 0197 to 0 0315 in 0 20 mm 0 0079 in Brush Length 14 0 mm 0 551 in 9 0 mm 0 354 in Alternator No load voltage More than 14 V Stator Resistance Less than 1 0 Ω Rotor Resistance 2 9 Ω Slip ring O D 14 4 mm 0 567 in 14 0 mm 0 551 ...

Page 372: ... 8 0 6 to 1 2 4 3 to 8 7 Pulley nut 58 4 to 78 9 5 95 to 80 5 43 1 to 58 2 RELATED PAGE TIGHTENING TORQUES on page 2 13 8 ELECTRICAL SYSTEM SERVICING 3 Tightening torques for electrical system 8 28 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 373: ...inal post and the cable terminal and the voltage across the battery s negative terminal post and the chassis 3 If the measurement exceeds the factory specification clean the battery terminal posts and cable clamps and tighten them firmly Potential differ ence Factory specifi cation Less than 0 1 V 4 1 3 Checking battery specific gravity NOTE Hold the hydrometer tube vertical without removing it fr...

Page 374: ...Gr Very little useful capacity 1 110 Sp Gr Discharged At an electrolyte temperature of 20 68 3 If the specific gravity is less than 1 215 after it is corrected for temperature charge or replace the battery 4 If the specific gravity differs between any two cells by more than 0 05 replace the battery 4 2 Main switch 4 2 1 Checking main switch connector voltage 1 Remove the under cover panel 2 Discon...

Page 375: ...nce B terminal ACC terminal 0 Ω 4 2 4 Checking main switch continuity at preheat position 1 B terminal 2 ST terminal 3 ACC terminal 4 G terminal 1 Set and hold the main switch key at the PREHEAT position 2 Measure the resistance with an ohmmeter across the B terminal and the G terminal and measure the resistance across the B terminal and the ACC terminal 3 If 0 ohm is not indicated these contacts ...

Page 376: ...7 If the motor does not operate check the motor 4 3 2 Testing starter magnet switch pull in holding coils IMPORTANT Testing time must be 3 to 5 sec A To negative terminal B To positive terminal C C terminal S S terminal 1 Remove the motor from the starter housing 2 Prepare a 6 V battery for the test 3 Connect jumper leads from the battery negative terminal to the housing and the starter C terminal...

Page 377: ... terminal and the chassis 3 If 0 ohm is indicated the screw at the tip of the glow plug and the housing are short circuited 4 If the factory specification is not indicated the glow plug is damaged Glow plug Factory specifi cation Approx 0 9 Ω 4 5 Safety switch 4 5 1 Checking PTO shift lever switch continuity 1 PTO shift lever switch 2 Plunger 3 4 terminal 4 8 terminal 5 5 terminal 6 1 terminal 1 R...

Page 378: ... the resistance with an ohmmeter across the HST neutral switch terminals 4 If the resistance values specified below are not indicated the safety switch is damaged Plunger is pushed into the switch body Resistance 4 terminal 3 8 terminal 4 0 Ω 5 terminal 5 1 terminal 6 0 Ω Plunger is released Resistance 4 terminal 3 8 terminal 4 Infinity 5 terminal 5 1 terminal 6 Infinity 4 6 Operator presence cont...

Page 379: ...ot as shown below the switch is damaged Replace it Resistance When switch is not pushed when operator leaves the seat Infinity A Seat switch is not pushed When switch is pushed when operator sits on the seat 1 Measure the resistance between terminals 5 2 If continuity is not as shown below the switch is damaged Replace it Resistance When switch is pushed when operator sits on the seat 0 Ω B Seat s...

Page 380: ...nd the bulb terminal 4 Connect the jumper lead across the red terminal 4 and the bulb terminal 5 If the bulb lights up when disconnecting the jumper lead from the red white terminal 2 the OPC timer 1 is proper 4 7 Fuel pump 4 7 1 Checking fuel pump connector voltage 1 Disconnect the 2P connector from the fuel pump 2 Turn the main switch key to the ON position and measure the voltage with a voltmet...

Page 381: ... stop solenoid is damaged 4 9 Timer relay 4 9 1 Checking timer relay connector voltage 1 Timer relay 1 Disconnect the connector from the timer relay after turning the main switch OFF 2 Measure the voltage with a voltmeter across the connector terminal 4 and chassis 3 Turn the main switch ON and measure the voltage across the connector terminal 3 and chassis 4 If these voltages differ from the batt...

Page 382: ...nsiderably low or the battery is fully charged the specified reading may not be obtained Current Factory specifi cation 14 to 15 A Voltage 14 to 15 V Alternator speed 5200 min 1 rpm 1 After starting the engine disconnect the battery positive cord and connect an ammeter and voltmeter Then switch on all electrical loads such as head lights and measure the charging current 1 Battery positive cord 4 1...

Page 383: ...h at OFF po sition Red yellow lead 1 Or ange lead 4 Infinity Red yellow lead 1 Yel low lead 3 4 11 4 Checking head light switch continuity when setting switch at ON position 1 Red yellow lead 2 Blue white lead 3 Yellow lead 4 Orange lead 5 Red white lead A Head light OFF position B Head light ON position 1 Set the light switch to the ON position 2 Measure the resistance with an ohmmeter across the...

Page 384: ...een white lead 3 4 11 6 Checking turn signal light switch continuity when setting switch knob at RIGHT position 1 Green lead 2 Red white lead 3 Green white lead A Turn signal light switch RIGHT position 1 Set the turn signal switch knob to the RIGHT position 2 Measure the resistance with an ohmmeter across the green lead 1 and red white lead 2 and across to the green lead 1 and green white lead 3 ...

Page 385: ...on Green lead 1 Red white lead 2 Infinity Green lead 1 Green white lead 3 0 Ω 4 11 8 Checking hazard switch continuity when setting switch knob at OFF position 1 Black blue lead 2 Blue white lead A Hazard switch OFF position 1 Set the hazard switch knob to the OFF position 2 Measure the resistance with an ohmmeter across the black blue lead 1 and blue white lead 2 3 If infinity is not indicated th...

Page 386: ...ch at ON position Black blue lead 1 Blue white lead 2 0 Ω 4 11 10 Checking flasher unit connector voltage 1 Remove the under panel 2 Disconnect the connector from the flasher unit 1 1 Flasher unit 3 Measure the voltage with a voltmeter across the connector terminal h and chassis 4 If the voltage differs from the battery voltage the wiring harness is damaged Voltage Terminal h Chassis Approx batter...

Page 387: ...ignal light switch function but the above actions do not take place replace the flasher unit with a new one 4 12 Gauge 4 12 1 Checking charge lamp charging circuit 1 Alternator 2 3P connector 3 L blue terminal 4 RY red yellow terminal 5 WG white green terminal A To the battery B To hour meter and tachome ter C To main switch D To charge indicator 1 Disconnect the 3P connector from the alternator a...

Page 388: ... Measure the resistance with an ohmmeter across the switch terminal and the chassis 3 If 0 ohm is not indicated in the normal state the switch is damaged Resistance Switch terminal Chassis In normal state 0 Ω 4 If infinity is not indicated at pressure the switch is damaged Resistance Switch terminal Chassis At pressure over approx 49 kPa 0 50 kgf cm2 7 1 psi Infinity 4 12 4 Checking fuel level sen...

Page 389: ...tage differs from the reference voltage the wiring harness fuse or coolant temperature gauge is damaged Voltage 2 terminal W Y Chas sis 4 9 to 5 1 V 4 12 6 Checking coolant temperature sensor continuity 1 Coolant temperature sensor 2 Coolant 1 Measure the resistance with an ohmmeter across the sensor 1 terminal and 2 terminal 2 If the reference value is not indicated the sensor is damaged Resistan...

Page 390: ...d tachometer are damaged Voltage while en gine operates at idling speeds Hour meter ter minal Alterna tor body Approx battery voltage 4 13 Accessory 4 13 1 Checking DC outlet connector voltage 1 Disconnect the connector from the DC outlet and turn the main switch ON 2 Measure the voltage with a voltmeter across the connector 1 terminal R L and the chassis 3 If the voltage differs from the battery ...

Page 391: ... meter panel as table below Terminal No Color of wiring Terminal name Related item T1 R B Glow plug T2 T3 T4 W G Charge warning T5 G Oil warning T6 T7 T8 L W Left turn T9 R W Right turn T10 T11 CAN L T12 CAN H T13 T14 Or W Low beam T15 L Tachometer T16 R L Ignition T17 Y L Fuel T18 B Ground T19 W Y Temperature T20 R G Battery 5 Disassembling and assembling 5 1 Starter 5 1 1 Disassembling starter m...

Page 392: ...the overrunning clutch 2 ball 3 spring 4 gears 5 rollers 6 and retainer 7 When reassembling Apply grease to the gear teeth of the gears 5 and overrunning clutch 2 and ball 3 5 1 3 Removing plunger 1 End cover 2 Plunger 1 Remove the end cover 1 2 Remove the plunger 2 5 2 Alternator 5 2 1 Removing pulley 1 Secure the hexagonal end of the pulley shaft with a double ended ratchet wrench as shown in th...

Page 393: ...gulator and remove the IC regulator 1 1 IC regulator 5 2 5 Removing rectifier 1 Remove the four screws holding the rectifier and the stator lead wires 2 Remove the rectifier 1 1 Rectifier 5 2 6 Removing rear end frame 1 Remove the two nuts and two screws holding the drive end frame and the rear end frame 2 Remove the rear end frame 1 1 Rear end frame SERVICING 5 Disassembling and assembling 8 ELEC...

Page 394: ...ing bearing on drive end side 1 Press out the bearing from drive end frame 3 with a press and jig 1 1 Jig 2 Block 3 Drive end frame 5 2 10 Removing bearing at slip ring side 1 Lightly secure the rotor 1 with a vise to prevent damage and remove the bearing 2 with a puller 3 1 Rotor 2 Bearing 3 Puller 6 Servicing 6 1 Starter 6 1 1 Checking overrunning clutch 8 ELECTRICAL SYSTEM SERVICING 5 Disassemb...

Page 395: ...0 0 mm 1 181 in Allowable limit 29 0 mm 1 142 in 4 If the difference of the O D s exceeds the allowable limit correct the commutator on a lathe to the factory specification Difference of O D s Factory specifi cation Less than 0 02 mm 0 0008 in Allowable limit 0 05 mm 0 0020 in 5 Measure the mica undercut 1 Segment 2 Undercut 3 Mica a Correct b Incorrect 6 If the undercut is less than the allowable...

Page 396: ...oil core with an ohmmeter 2 If it conducts replace the armature 3 Check the continuity across the segments of the commutator with an ohmmeter 4 If it does not conduct replace the armature 6 1 6 Checking field coil 1 Check the continuity across the lead 1 and brush 2 with an ohmmeter 1 Lead 2 Brush 2 If it does not conduct replace the yoke assembly 3 Check the continuity across the brush 2 and yoke...

Page 397: ...Measure the resistance across the slip rings 2 If the resistance is zero or infinity replace it Resistance Service specifi cation 2 9 Ω 3 Check the continuity across the slip ring and core with resistance range of circuit tester 4 If infinity is not indicated replace it 6 2 4 Checking slip ring 1 Check the slip ring for score 2 If scored correct with an emery paper or on a lathe 3 Measure the O D ...

Page 398: ...sh moves smoothly 4 If the brush is damaged replace it 6 2 6 Checking rectifier 1 Check the continuity across each diode of rectifier with resistance range of circuit tester The rectifier is normal if the diode in the rectifier conducts in one direction and does not conduct in the reverse direction 8 ELECTRICAL SYSTEM SERVICING 6 Servicing 8 54 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18B...

Page 399: ...9 MOWER KiSC issued 03 2019 A ...

Page 400: ...inion shaft 3 Bevel gear 1 Bevel gear 2 Bevel gear shaft 8 Center pulley 7 Mower belt 9 Outer pulley 11 Blade shaft 10 Outer blade 12 1 Bevel gear 2 Bevel gear 3 Pinion shaft 4 Universal joint 5 Mid PTO shaft 6 Center blade 7 Center pulley 8 Bevel gear shaft 9 Mower belt 10 Blade shaft 11 Outer pulley 12 Outer blade MECHANISM 1 Structure of power transmission of mower 9 MOWER BX1880 BX2380 BX2680 ...

Page 401: ...ressure of hydraulic system and the rear lift link L H 5 is pulled rearward Therefore rear lift links 4 5 rotate and the mower is lifted by the lift links 3 and rear links 2 As this link system is a parallel linkage the mower can be kept parallel at every position 1 Front link 2 Rear link 3 Lift link 4 Rear lift link R H 5 Rear lift link L H 6 Lift arm 9 MOWER MECHANISM 2 Structure of lifting mech...

Page 402: ... waves by its own weight This may cause an uneven mowing The wider the mower is the more unevenness is caused 6 Anti scalp roller a Tilt Tractor b Tilt Mower deck c Ground d Grass A Without self balancer With self balancer type B When working on a wavy ground the tractor itself goes along the curves of the terrain like with the tractor that is not equipped with the self balancer The balancer sprin...

Page 403: ...9 MOWER MECHANISM 9 4 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 404: ...et engine RPM Cutting is poor 1 Mower blade worn or broken Sharpen or replace mower blade 9 20 2 Mower blade screw loose Re tighten mower blade screw 9 20 3 Cutting height improper Adjust cutting height 9 15 to 9 18 4 Ground speed too fast Slow down 5 Low tire pressure Add air to correct 2 47 6 Anti scalp rollers not adjusted correctly Adjust anti scalp rollers 9 18 Mower is not lifted 1 Linkage s...

Page 405: ...right tip of blade Difference Less than 3 mm 0 12 in Balancer spring Length 55 0 mm 2 17 in Input shaft without mower belt Turning torque Less than 0 7 N m 0 07 kgf m 0 52 lbf ft Bevel gears in gear box Backlash 0 10 to 0 20 mm 0 0040 to 0 0078 in 0 40 mm 0 016 in 9 MOWER SERVICING 2 Servicing specifications for mower 9 6 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26...

Page 406: ...mounting nut 197 to 225 20 0 to 23 0 145 to 166 Gear box bracket mounting bolt an nut 78 to 90 7 9 to 9 2 58 to 66 Pulley boss mounting nut 24 to 27 2 4 to 2 8 18 to 20 Outer pulley holder mounting bolt and nut 78 to 90 7 9 to 9 2 58 to 66 RELATED PAGE TIGHTENING TORQUES on page 2 13 SERVICING 3 Tightening torques for mower 9 MOWER BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX...

Page 407: ... spring discharge pin and cotter pin Secure the spring to the discharge deflector as illustrated 4 2 Setting mower CAUTION Park the tractor on a firm flat and level surface set the parking brake stop the engine and remove the key 1 Hydraulic control lever 1 Start the engine and move the hydraulic lever 1 rearward to raise the mower rear link to the highest position 2 Stop the engine and remove the...

Page 408: ... 1 Cutting height control dial 2 Hydraulic control lever 3 Rear link 4 L pin 1 Set the cutting height control dial 1 to zero inch position 2 Operate the tractor s hydraulic control lever 2 forward to lower the mower rear links 3 Attach the rear links 3 to the mower with the L pins 4 4 5 Mounting front link 1 Hook the front link 1 to the front bracket groove 2 as shown in the figure 1 Front link 2 ...

Page 409: ...ont lever 3 Hook the front link to the lever fulcrum and lift the front lever 4 Release the L pin to lock the front lever 5 Setting up mower RCK54D 26BX and RCK60D 26BX 5 1 Assembling mower DANGER To avoid serious injury or death Do not operate the mower without the discharge deflector properly in position 1 Anti scalp roller 2 Block 3 Clevis pin 4 Circlip 5 F spring 6 Ramp F 7 Ramp R 1 Place the ...

Page 410: ...ve the front loader front attachment and 3 point hitch attachment 1 Adjust all the anti scalp rollers to the F position 4 5 holes X must be visible 2 Unlock the lever 1 to lift up the rear anti scalp roller 1 Lever 3 Pull the L pin 2 and extend the ramp 3 to front and rear sides 2 L pin 3 Ramp RELATED PAGE 5 1 Assembling mower on page 9 10 5 3 Mounting front link CAUTION To avoid personal injury A...

Page 411: ...lock 2 Link arm 3 Universal joint A 160 mm 6 3 in B 120 mm 4 7 in 1 Place blocks below the frame link if one person does the setting Heights of blocks are recommended value for attaching 2 Start engine Set the cutting height to 0 mm 0 in and lower the frame link Then stop the engine 3 Attach the frame link to the link arm 4 Joint the front link and frame link with joint pin and circlip 5 Attach th...

Page 412: ...ctor rides on there is less grip between the ground and mower Change area and try again 1 Start the engine and engage 4WD Set the range gear shift lever to LOW Release the parking brake 2 With the right front tire make a driving target to the guide 1 1 Guide 3 Drive over the ramp of mower along the guide 1 Keep the front tire side touching the guide rod 4 Just after the tractor drove over the mowe...

Page 413: ...scalp roller 8 RELATED PAGE 6 1 6 Adjusting cutting height on page 9 18 6 Checking and adjusting 6 1 Mower adjustment CAUTION Park the tractor on a firm flat and level surface and set the parking brake Stop the engine remove the key and allow the blades to stop before making adjustments Wear heavy gloves or wrap end of blade with a rag when you handle blades Before starting the engine set the PTO ...

Page 414: ...cation 0 to 0 5 mm 0 to 0 01 in 6 1 2 Adjusting front and rear cutting height RCK48 18BX RCK54 23BX and RCK60B 23BX IMPORTANT Park the machine on a firm flat and level surface and set the parking brake Before adjusting mower deck make sure the tire pressure is correct 1 Cutting height control dial 2 Hydraulic control lever 3 Lock nut L Length of front link F Height of blade tip Front R Height of b...

Page 415: ...re is correct 1 Spring lock washer 2 Lock nut 3 Lock nut 1 Turn the cutting height control dial to 2 0 and adjust the anti scalp roller s height to factory specified clearance between the rollers and the ground Clearance be tween rollers and ground Factory specifi cation 6 0 to 13 mm 0 25 to 0 50 in 2 Align the ends of the right side blade towards the front and rear of the machine Turn blade by ha...

Page 416: ... to tractor axle and turn right blade parallel to axle to measure from the outside blade tip at L and R to the level surface The difference between measurement should be less than the factory specification Difference L R between left tip and right tip of blade Factory specifi cation Less than 3 mm 0 12 in 7 If the difference between measurement is more than the factory specification loosen the loc...

Page 417: ...ing height when mowing rolling terrain follow the procedure below 1 Cutting height control dial 2 Hydraulic control lever 1 To set the cutting height move the hydraulic control lever rearward to raise the mower to the highest position Turn the cutting height control dial 1 to adjust height 2 Set the anti scalp roller s 3 height as shown to keep clearance between rollers and ground Clearance be twe...

Page 418: ...r blade and belt 6 2 1 Checking mower blade 1 Check the cutting edge of mower blade 1 New blade 2 Worn blade 3 Cracked blade 2 Sharpen the cutting edges if the mower blades are as shown in figure 2 NOTE To sharpen the mower blades by yourself clamp the mower blade securely in a vise and use a large mill file along the original bevel To balance the mower blade place a small rod through the center h...

Page 419: ... bolt and nut 78 to 90 N m 7 9 to 9 2 kgf m 58 to 66 lbf ft Gear box mount ing screw 78 to 90 N m 7 9 to 9 2 kgf m 58 to 66 lbf ft 7 Disassembling and assembling 7 1 Removing universal joint and belt cover RCK48 18BX RCK54 23BX and RCK60B 23BX 1 Universal joint 2 Belt cover Left 3 Belt cover Right 1 Remove the universal joint screw 2 Remove the universal joint 1 3 Remove the left and right belt co...

Page 420: ... the blade in position together with the dust cover and the cup washer s Tighten them up with the screw Tightening tor que Mower blade screw 103 to 117 N m 10 5 to 12 0 kgf m 76 0 to 86 7 lbf ft 7 4 Removing blade boss 1 Blade boss 2 External circlip 1 Remove the external circlip 2 2 Remove the blade boss 1 7 5 Removing gear box and mower belt 1 Gear box 2 Gear box mounting screw Reamer screw 3 Mo...

Page 421: ...e the gear box cap 5 4 Remove the oil seal 10 internal circlip 11 and shim 12 5 Tap out the pinion shaft 14 with the ball bearing 13 and remove the bevel gear 4 6 Remove the ball bearing 3 and shims if installed 7 Remove the external circlip 6 and draw out the bevel gear shaft 19 8 Remove the bevel gear 7 ball bearing 8 shim 9 and oil seal 17 When reassembling Replace the oil seals 10 17 and gear ...

Page 422: ...hen tighten the center pulley holder bolts 1 and nut 5 with specified torque Replace the oil seals 4 6 with new ones Install the reamer screw 12 reamer bolt 15 at their original positions as shown in the figure Be sure to fix the O rings 7 13 to the original position Tightening tor que Center pulley hold er bolt and nut 78 to 90 N m 7 9 to 9 2 kgf m 58 to 66 lbf ft Gear box mount ing screw 7 8 Rem...

Page 423: ...move the ball bearing 18 and oil seal 19 When reassembling Replace the oil seals 13 and 19 with new ones Tightening tor que Outer pulley mounting nut 197 to 225 N m 20 0 to 23 0 kgf m 145 to 166 lbf ft Pulley boss mounting nut 24 to 27 N m 2 4 to 2 8 kgf m 18 to 20 lbf ft RCK54 23BX RCK60B 23BX RCK54D 26BX RCK60D 26BX Tightening tor que Outer pulley holder mounting bolt and nut 78 to 90 N m 7 9 to...

Page 424: ...0 07 kgf m 0 52 lbf ft Thickness of adjusting shims 1 2 0 2 mm 0 0079 in 0 3 mm 0 0118 in Thickness of adjusting shims 3 0 2 mm 0 0079 in 0 3 mm 0 0118 in 8 2 Adjusting backlash between bevel gears 1 Shim 2 21T bevel gear RCK48 18BX 19T bevel gear RCK54 23BX RCK54D 26BX 18T bevel gear RCK60B 23BX RCK60D 26BX 3 Gear box cap 4 Shim 5 Input shaft 6 Shim 7 External circlip 1 Remove the gear box cap 3 ...

Page 425: ...to 0 20 mm 0 0040 to 0 0078 in Allowable limit 0 40 mm 0 016 in Thickness of adjusting shims 1 4 0 2 mm 0 0079 in 0 3 mm 0 0118 in Thickness of adjusting shims 6 0 1 mm 0 0039 in 0 2 mm 0 0079 in 9 MOWER SERVICING 8 Servicing 9 26 BX1880 BX2380 BX2680 RCK60B 23BX RCK54 23BX RCK48 18BX RCK60D 26BX RCK54D 26BX KiSC issued 03 2019 A ...

Page 426: ...aring checking 4 59 8 53 bearing at slip ring side removing 8 50 bearing case cover removing 3 53 bearing holder checking flatness 4 62 bearing on drive end side removing 8 50 belt cover RCK48 18BX removing 9 20 belt cover RCK54 23BX removing 9 20 belt cover RCK54D 26BX removing 9 20 belt cover RCK60B 23BX removing 9 20 belt cover RCK60D 26BX removing 9 20 belt tension pivot greasing 2 43 bevel ge...

Page 427: ...n checking flatness 4 60 clutch spring checking free length 4 60 combination switch checking connector voltage 8 38 removing 8 38 commutator checking 8 51 compression pressure checking 3 30 connecting rod checking alignment 3 67 function 3 2 removing 3 51 3 52 control valve 6 3 disassembling 7 49 down position 7 7 lift position 7 6 neutral position 7 5 outline 7 4 removing 7 44 7 48 structure 6 3 ...

Page 428: ... 22 electrical connector chart 8 2 electrical connectors handling precautions 8 7 layout diagram 8 6 electrical part handling precaution 2 5 electrical system service specifications 8 27 tightening torques 8 28 troubleshooting 8 21 electrical wiring checking and cleaning 2 22 electrical wiring chart symbols 8 3 engine separating 3 41 servicing specifications 3 19 tightening torques 3 28 troublesho...

Page 429: ... bolt torque 2 26 removing 5 10 front wheel drive structure 4 13 front wheel drive lever removing 4 43 front wheel drive shaft assembling 4 56 fuel 2 8 fuel feed pump function 3 12 fuel filter checking 2 29 function 3 12 fuel filter element replacing 2 35 fuel gauge checking 2 19 function 8 16 fuel hose disconnecting 3 40 replacing 2 40 fuel injection nozzle checking injection pressure 2 36 fuel i...

Page 430: ...embling 4 55 hydraulic arm removing 7 45 hydraulic arm shaft removing 7 45 hydraulic arm shaft bushing checking 7 52 hydraulic block type outlet structure 7 15 hydraulic circuit 7 2 steering 6 2 hydraulic control lever removing 4 43 hydraulic cylinder checking bore 7 51 removing 4 48 structure 7 14 hydraulic cylinder block removing 7 43 hydraulic piston removing 7 45 hydraulic pump checking oil fl...

Page 431: ... checking connector voltage 8 47 checking sensor resistance 8 47 checking switch continuity 8 47 metering device function 6 3 structure 6 3 mica checking 8 51 mid and rear PTO structure 4 21 mid PTO shaft assembling 4 56 motor checking 8 32 mower adjusting cutting height 9 18 adjusting left and right cutting height 9 16 assembling 9 8 9 10 checking identification 2 2 lubricants 2 11 mounting 9 13 ...

Page 432: ...ecking 2 23 pinion shaft adjusting turning torque 9 25 piston function 3 2 removing 3 51 4 46 piston pin checking bore I D 3 66 piston pin and small end bushing checking oil clearance 3 66 piston ring checking gap 3 68 function 3 2 removing 3 52 piston ring and piston ring groove checking clearance 3 68 plunger removing 8 48 power steering checking oil flow 7 35 power steering cylinder removing 5 ...

Page 433: ...allast 2 49 weight 2 51 rear end cover removing 8 49 rear end frame removing 8 49 rear link mounting 9 9 rear PTO cover assembly removing 4 51 rear PTO switch function 8 10 rear wheel 2 48 checking bolt torque 2 26 removing 4 39 rectifier checking 8 54 removing 8 49 refueling 2 19 relay function 8 9 relief valve checking 3 78 checking operating pressure 6 11 checking setting pressure 7 34 function...

Page 434: ...ring controller removing 6 13 structure 6 3 steering cylinder checking I D 6 16 disassembling 6 12 structure 6 5 steering system structure 6 1 steering wheel removing 6 13 step removing 4 38 7 38 7 41 7 47 stud bolts tightening torque 2 13 swashplate removing 4 46 T tachometer checking 8 46 function 8 16 tail light checking 2 22 tappet removing 3 46 tappet and tappet guide bore checking oil cleara...

Page 435: ... 18BX removing 9 20 universal joint RCK54 23BX removing 9 20 universal joint RCK60B 23BX removing 9 20 upper panel removing 6 13 V valve checking clearance 3 30 checking recessing 3 57 checking seating 3 58 correcting 3 59 lapping 3 60 removing 3 46 valve guide replacing 3 58 valve guide replacing tool 2 56 valve plate removing 4 44 valve seat checking tightness 3 37 correcting 3 59 valve spring c...

Page 436: ...72 245 2484 E mail kbt_g ag sv kubota com Editor Harvester Transplanter and Farm Machinery Products Service Dept Address 64 Ishizu Kitamachi Sakai Ku Sakai City Osaka 590 0823 Japan Phone 81 72 241 6554 Fax 81 72 241 1751 E mail kbt_g ag sv kubota com KUBOTA Corporation Printed in Japan 2019 03 S EI EI engusa 2017 02 S EI EI engusa Code No 9Y111 16342 ...

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