Kubota LA1153, Workshop Manual

Page 1: ...ety decals Clean the work area and machine Park the machine on a firm and level ground and set the parking brake Lower the implement to the ground Stop the engine and remove the key Disconnect the battery negative cable Hang a O NOT OPERATE tag in operator station A DANGER Indicates an imminently hazardous situation which if not avoided will result in death or serious injury A WARNING Indicates a ...

Page 2: ...ely by a jack Always support the machine by safety stands Do not touch the rotating or hot parts while the engine is running Never remove the radiator cap while the engine is running or immediately after stopping Otherwise hot water will spout out from radiator Only remove radiator cap when cool enough to touch with bare hands Slowly loosen the cap to first stop to relieve pressure before removing...

Page 3: ...d into eyes Keep electrolyte away from eyes hands and clothing If you spill electrolyte on yourself flush with water and get medical attention immediately DISPOSE OF FLUIDS PROPERLY Do not pour fluids into the ground down a drain or into a stream pond or lake Observe relevant environmental protection regulations when disposing of oil fuel coolant electrolyte and other harmful waste PREPARE FOR EME...

Page 4: ...ls are installed on the machine If a decal becomes damaged illegible or is not on the machine replace it The decal part number is listed in the parts list 1 Part No 7J246 5641 1 2 Part No 7J246 5642 1 3 Part No 7J417 7778 1 M1858 M1859 M1864 M1865 4FAAAAAAPOO2F 3FUAAAICP001 A 4 ...

Page 5: ...LA1153 LA1353 WSM SAFETY INSTRUCTIONS 1 Part NO 7J246 5645 1 2 Part No 7J246 5644 2 Both sides 3 3 Part No 7J266 5649 2 4 Part No 7J417 9321 1 M1866 1AIABCFAP050A 3FUAAAICP002A 5 ...

Page 6: ...rning and caution labels with soap and water dry with a soft cloth 3 Replace damaged or missing danger warning and caution labels with new labels from your local KUBOTA Dealer 4 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 5 Mount new danger warning and caution labels ...

Page 7: ...153 LA1353 WSM LOADER TERMINOLOGY LOADER TERMINOLOGY 3UFAAAIDP001 A 9 1 Mounting Pin 4 Boom Cylinder 6 Boom 8 Bucket 2 Side Frame 5 Main Frame 7 Bucket Cylinder 9 Control Lever 3 Hydraulic Control Valve 7 ...

Page 8: ...cuit Rated Flow Maximum Pressure 42 Umin 11 1 U S gals min 9 2 Imp gals min 19 8 MPa 202 kgf cm2 2873 psi 64 3Umln 17 0 U S gals min 14 1 Imp gals min 20 7 MPa 211 kgf cm2 3002 psi Net Weight Approximate 700 kg 1543 Ibs 840 kg 1852 Ibs W1027852 2 BUCKET SPECIFICATIONS Loader Model LA1153 I LA1353 Model ROUND 72 ROUND 84 LIGHT MATERIAL 84 Type Quick Attach Width 1830 mm 72 0 in 2135 mm 84 0 in L 65...

Page 9: ...INDER FULCRUM POINT Lift capacity Bucket bottom mid point U Lift capacity Bucket pivot pin max height V Lift capacity 800 mm forward max height W Lift capacity Bucket pivot pin 1500 mm height X Lift capacity 800 mm forward 1500 mm height Y Breakout force Bucket pivot pin Z Breakout lorce 800 mm forward W Bucket roll back force at maxumum height XX Bucket roll back force at 1 5 m 59 in ZZ Bucket ro...

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Page 11: ...ALVE M 9 2 CONTROL VALVE ASSEMBLY LA1353 STANDARD VALVE M 10 1 HYDRAULIC CiRCUiT M 10 2 STRUCTURE M 11 3 OPERATION M 12 4 RELIEF VALVE M 18 3 SELF LEVEL VALVE M 21 1 HYDRAULIC CiRCUiT M 21 2 STRUCTURE M 22 3 OPERATION M 23 4 RELIEF VALVE M 63 1 Main Relief Valve M 63 2 Overload Relief Valve M 64 4 BOOM CYLINDER AND BUCKET CyLINDER M 66 ...

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Page 13: ...AAAILP029A 5 6 To operate the front loader the hydraulic oil pressurized by the hydraulic pump flows from P port through the boom control valve 5 and the bucket control valve 6 to P B port or T port 1 Boom Cylinder 4 Relief Valve P From Pump A1 A1 Port 2 Bucket Cylinder 5 Boom Control Valve T ToTank A2 A2 Port 3 Control Valve Assembly 6 Bucket Control Valve P B To 3 Point Hydraulic B1 B1 Port Syst...

Page 14: ...to the TANK port of hydraulic block by the hydraulic hose 2 Boom Control Section The boom control valve is of 4 position 6 connection detent spring center type conSisting of a mono block valve housing spool load check valve etc This valve has A1 and B1 ports and controls oil flow to the boom cylinder 3 Bucket Control Section The bucket control valve is of 3 position 6 connection no detent spring c...

Page 15: ... I I I I 1 ________ 1 2 3 A2 6 82 8 3UFAAAllP023A 7 1 Boom Control Section 5 P B Passage 1 T T Port B1 B1 Port 2 Bucket Control Section 6 P B Passage 2 P P Port B2 B2 Port 3 Spool 7 load Check Valve A1 A1 Port P B P B Port 4 Spool 8 Relief Valve A2 A2 Port 8 Low Pressure M 3 ...

Page 16: ...c control lever is set to the UP position the spool 3 of the boom control section 1 moves to the left which forms oil passages between passage 1 7 and 61 port and between A1 port and P 6 passage 1 4 2 As the oil passage from the neutral passage 1 5 to the PB passage 1 4 is closed by the spool 3 the pressure fed oil from the P port opens the load check valve 6 and flows through the notched section ...

Page 17: ...en the hydraulic control lever is set to the DOWN position the spool 3 moves to the right which forms oil passages between passage 1 7 and A1 port and between B1 port and P B passage 1 4 2 As the oil passage from the neutral passage 1 5 to the PB passage 1 4 is closed by the spool 3 the pressure fed oil from the P port opens the load check valve 6 and flows through the notched section of the spool...

Page 18: ... Passage 1 a Low Pressure 1 When the hydraulic control lever is set to the FLOAT position the spool 3 moves further to the right from the DOWN position and is retained by the detent mechanism 5 2 This forms oil passages among the A1 port B1 port and T port As a result oil in the boom cylinder 7 flows freely from the A1 port and B1 port through the T port to the transmission case 3 Oil entering the...

Page 19: ...control lever is set to the ROLL BACK position the spool 4 of the bucket control section 2 moves to the left which forms oil passages between passage 2 8 and B2 port and between A2 port and T port 2 The pressure fed oil from the P port flows to the neutral passage 2 5 through the boom control section 1 and P B passage 1 3 As the oil passage from the neutral passage 2 5 to the P B passage 2 6 is cl...

Page 20: ...2 __J T 1 When the hydraulic control lever is set to the DUMP position the spool 4 which forms oil passages among passage 2 8 A2 port and 82 port 2 The pressure fed oil from the P port flows to the A2 port just like the DUMP position 3 Return oil from the bucket cylinder 9 flows from the 82 port to the passage 2 8 and flows to the A2 port together with the pressure fed oif from the P port As a res...

Page 21: ...P P Port 6 Sensing Passage b Middle Pressure 7 Spring W10153050 Relief Valve in Operation As the oil pressure in the circuit rises so does the pressure in the chamber C When it reaches the pilot valve setting pressure the pilot valve 2 opens This releases oil in the chamber C to the transmission case Accordingly the oil in the circuit flows to the chamber C through the passage 5 The resulting pres...

Page 22: ...draulic oil pressurized by the hydraulic pump flows from P port through the boom control valve 5 and the bucket control valve 6 to P B port or T port 1 Boom Cylinder 4 Relief Valve P From Pump A1 A1 Port 2 Bucket Cylinder 5 Boom Control Valve T To Tank A2 A2 Port 3 Control Valve Assembly 6 Bucket Control Valve P B To 3 Point Hydraulic B1 B1 Port System B2 B2 Port M 10 ...

Page 23: ...t of hydraulic block by the hydraulic hose 2 Boom Control Section The boom control valve is of 4 position 6 connection detent spring center type consisting of a mono block valve housing spool load check valve etc This valve has A1 and B1 ports and controls oil flow to the boom cylinder 3 Bucket Control Section The bucket control valve is of 3 position 6 connection no detent spring center type cons...

Page 24: ... P B P B Port 4 Spool 9 Load Check Valve A2 A2 Port a Low Pressure 5 Bucket Control Valve 10 Load Check Valve 1 Pressure fed oil from the hydraulic pump is delivered into P port in the inlet section 2 2 As the load check valve 9 10 are kept closed in the neutral position oil flows along the notched section of the spools 4 8 to the P B port through the P B passage 1 3 and 2 7 3 Then the oil is fed ...

Page 25: ...e fed oil from the P port opens the load check valve 10 and flows through the notched section of the spool 5 and B1 port to extend the boom cylinder 1 3 Return oil from the boom cylinder flows from the A1 port through the passage in the spool 5 and P B passage 1 7 to bucket control valve 2 1 Boom Cylinder P P Port 2 Bucket Control Valve T T Port 3 Boom Control Valve A1 A1 Port 4 Inlet section From...

Page 26: ...ed oil from the P port opens the load check valve 10 and flows through the notched section of the spool 5 and A1 port to retract the boom cylinder 1 3 Return oil from the boom cylinder flows from the B1 port through the passage in the spool 5 and P B passage 1 7 to the bucket control valve 2 i Boom Cylinder P P Port 2 Bucket Control Valve T T Port 3 Boom Control Valve Ai Ai Port 4 Inlet section To...

Page 27: ...oil in the boom cylinder flows freely from the A1 port and B1 port through the T port to the transmission case 3 Oil entering the P port flows to the bucket control valve 2 through the neutral passage 1 9 and P B passage 1 8 Then the oil flows to the three point hydraulic system 1 Boom Cylinder P P Port 2 Bucket Control Valve T T Port 3 800m Control Valve A1 A1 Port 4 Inlet section B1 B1 Port 5 SP...

Page 28: ... P port flows through the boom control valve 3 opens the load check valve 9 and flows through the notched section of the spool 6 and B2 port to retract the bucket cylinder 1 3 Return oil from the bucket cylinder flows to the transmission case through the A2 port and T port 1 Bucket Cylinder P P Port 2 Bucket Control Valve T T Port 3 Boom Control Valve A2 A2 Port 4 Inlet section From Bucket Cylinde...

Page 29: ... A2 port to extend the bucket cylinder 1 3 Return oil from the bucket cylinder flows from the B2 port to the passage 2 10 and flows to the A2 port together with the pressure fed oil from the P port As a result the dump speed is increased Reference The oil pressure of the A2 port and B2 port is identical but the bucket cylinder extend by the difference of received pressure area cylinder rod part 1 ...

Page 30: ...large volumetric flow and has better pressure override performance than direct acting relief valves This relief valve is a combination valve combining a relief operation and anti cavitation operation 1 Inlet Section of Control Valve 8 Jam Nut 2 Main Relief Valve 9 Acorn Nut 3 Piston Poppet 10 Piston Spring 4 Relief Valve Poppet 11 Pilot Poppet 5 Housing 12 Pilot Spring 6 Check Valve Poppet 13 Adju...

Page 31: ...nd to the low pressure chamber LP HP 3 Pilot Poppet 3UFAAAILP093A Step 3 The loss of oil behind the piston poppet 4 effected 1 by the opening of pilot poppet 3 causes piston poppet 4 to move back and seat against pilot poppet 3 This shuts off the oil flow to the area behind relief valve poppet 1 and causes a low pressure area internally 1 Relief Valve Poppet 4 Piston Poppet 3 Pilot Poppet 4 3 3UFA...

Page 32: ...ation has occurred A lower pressure exists in the port HP compared to the low pressure chamber LP The difference between the effective area of diameter A and C causes imbalance of the check valve poppet 1 which unseats thus allowing oil from the low pressure chamber LP to enter the port HP and fill the void 1 Check Valve Poppet M 20 ...

Page 33: ...ssurized by the hydraulic pump flows from P port through the boom control valve 5 and the bucket control valve 6 to P B port or T port 1 Boom Cylinder 4 Relief Valve P From Pump A1 A1 Port 2 Bucket Cylinder 5 Boom Control Valve T To Tank A2 A2 Port 3 Control Valve Assembly 6 Bucket Control Valve P B To 3 Point Hydraulic B1 B1 Port System B2 B2 Port M 21 ...

Page 34: ...r section as shown above 1 Boom Control Valve The boom control valve is of 4 position 8 connection detent spring center type consisting of a valve housing spool load check valve etc This valve has A1 and B1 ports and controls oil flow to the boom cylinder 2 Self leveling Valve The self leveling control valve is of 2 position 6 connection detent type consisting of a valve housing spool etc The self...

Page 35: ...port 26 1 1 8 r I 30 I I 1 PPort 2 Load Check Valve 3 Boom Spool 4 Center By pass Passage 5 Passage A 6 Passage B 7 Raising Adjuster 8 Lowering Adjuster 9 Raising Divider SpOOl 10 Lowering Divider Spool 11 Passage C 12 Passage 0 13 Raising Overload Relief Valve 14 Lowering Overload Relief Valve 15 Self leveling Spool 16 Passage E 17 Passage F 18 Check Valve 19 Check Valve 20 Passage G 21 Passage H...

Page 36: ... 2 a a bOb 13UFAAAILPOOJA 1 0 I a 1 P Port 25 Bucket Spool P P Port Pump Port a a Section a a 3 Boom Spool 26 P B Port T T Port Tank Port b b Section bob 4 Center By pass Passage P B P B Port Power Beyond 8 Low Pressure Port 1 to 10 Oil Flow M 24 ...

Page 37: ...igure 3 c c dOd Ilt 1 8 3TVAAAELP003A 25 Bucket Spool A2 A2 Port Connected Bucket c c Bucket Section 8 Low Pressure Rod Cylinder dod Sequence Section 1 to 10 011 Flow B2 B2 Port Connected Bucket e e Self leveling Section Bottom Cylinder M 25 ...

Page 38: ... 4 t f a f f Divider Section gog Boom Section a Low Pressure 1 to 10 Oil Flow gog 3TVAAAELP004A 1 P Port P P Port Pump Port A1 A1 Port Connected Boom 3 Boom Spool Bottom Cylinder 4 Center By pass Passage B1 B1 Port Connected Boom Rod Cylinder M 26 ...

Page 39: ...ischarged through the opened A1 port via the load check valve 2 because the center by pass passage 4 is shut off and is supplied to the boom cylinder rod side and acts in the direction extending the boom cylinder 28 Since the boom cylinder 28 extends the oil in the rod side tlows into the valve through B1 port and is led into the passage A 5 At this time all the oil does not go to the raising divi...

Page 40: ... a a p bOb 3UFAAAILP005A b 3 Boom Spool 9 Raising Divider Spool P P Port Pump Port a a Section a a 5 Passage A 15 Self leveling Spool T T Port Tank Port bob Section bob P B P B Port Power Beyond a Low Pressure Port b Middle Pressure 1 to 13 Oil Flow M 28 ...

Page 41: ...igure 3 c c dOd e e a 3TVAAAELP023A 15 Self leveling Spool A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure Rod Cylinder dod Sequence Section 1 to 13 Oil Flow B2 B2 Port Connected Bucket ewe Self leveling Section Bottom Cylinder M 29 ...

Page 42: ...TVAAAELP024A 1 P Port A1 A1 Port Connected Boom P P Port Pump Port 8 Low Pressure 2 Load Check Valve Bottom Cylinder 1 f Divider Section b Middle Pressure 3 Boom Spool B1 B1 Port Connected Boom g g Boom Section 1 to 13 011 Flow 9 Raising Divider Spool Rod Cylinder M 30 ...

Page 43: ...he hydraulic oil in the rod side flows into the valve through B1 port and is led to the passage A 5 The hydraulic oil is divided to two flows The most part of the hydraulic oil is directly led to the raising divider spool 9 via the raising adjuster 7 Refer to the a a The divider 9 divides the oil flows to the bucket cylinder 29 and the surplusing oil flows to P B port 26 depending on the flows div...

Page 44: ...Overload Relief Valve P P Port Pump Port a a Section a a 3 Boom Spool 18 Check Valve T T Port Tank Port bob Section bob 7 Raising Adjuster 21 Passage H P B P B Port Power Beyond a Low Pressure 9 Raising Divider Spool 23 Raising Sequence Spool Port b Middle Pressure 11 Passage C 26 P B Port 1to 22 Oil Flow e High Pressure M 32 ...

Page 45: ...8 e e b i 3TVAAAELPOO7A 18 Check Valve A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure 21 Passage H Rod Cylinder dod Sequence Section b Middle Pressure 23 Raising Sequence Spool B2 B2 Port Connected Bucket e e Self leveling Section 1 to 22 011 Flow Bottom Cylinder M 33 ...

Page 46: ... Section gog Boom Section M 34 9 f f gog a b c 3TVAAAELPOO8A 1 P Port A1 A1 Port Connected Boom a Low Pressure 2 Load Check Valve Bottom Cylinder b Middle Pressure 3 Boom Spool B1 B1 Port Connected Boom c High Pressure 5 Passage A Rod Cylinder 1 to 22 Oil Flow 7 Raising Adjuster 9 Raising Divider Spool ...

Page 47: ...ic oil is divided to two flows The most part of the hydraulic oil is directly led to the raising divider spool 9 via the raising adjuster 7 Refer to the a a The divider 9 divides the oil flows to the bucket cylinder 29 and the surplusing oil flows to P B port 26 depending on the flows division ratio The hydraulic oil is supplied to the passage C 11 the check valve 18 and the B2 port of the bucket ...

Page 48: ... 11 PassageC P P Port Pump Port a a Section a a 3 Boom Spool 18 Check Valve T T Port Tank Port b b Section bob 4 Center By pass Passage 21 Passage H P B P B Port Power Beyond a Low Pressure 7 Raising Adjuster 26 P B Port Port b Middle Pressure 9 Raising Divider Spool 27 T Port 1 to 17 all Flow C High Pressure M 36 ...

Page 49: ...VAAAELP011 A 11 Passage C A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure 13 Raising OverioadRelief Valve Rod Cylinder dod Sequence Section c High Pressure 18 Check Valve B2 B2 Port Connected Bucket e e Self leveling Section 1 to 17 011 Flow 23 Raising Sequence Spool Bottom Cylinder M 37 ...

Page 50: ...ELP012A 2 2 Load Check Valve A1 A1 Port Connected Boom P P Port Pump Port 8 Low Pressure 3 Boom Spool Bottom Cylinder f f Divider Section b Middle Pressure 5 Passage A 7 Raising Adjuster B1 B1 Port Connected Boom Rod Cylinder gog Boom Section c High Pressure 1 to 17 all Flow 9 Raising Divider Spool M 38 ...

Page 51: ...4 is shut off and is supplied to the boom cylinder rod side and acts in the direction retracting the boom cylinder 28 As the boom cylinder 28 retracts the oil in the bottom side flows into the valve through A1 port and is led into the passage B 6 At this time all the oil is not led to the lowering divider spool 10 but is led to the center by pass passage 4 because the passage B 6 is connected to t...

Page 52: ...b b 1 P P Port Pump Port a a Section a a T T Port Tank Port bob Section b b P B P B Port Power Beyond a a Low Pressure b Middle Pressure 1 to 11 Oil Flow b 3UFAAAILP011A 1 P Port 3 Boom Spool 4 Center By pass Passage 6 Passage B Port 15 Self leveling Spool M 40 ...

Page 53: ...Figure 3 c c d d e e a 3TVAAAELP027A 15 Self leveling Spool A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure Rod Cylinder d d Sequence Section 1 to 11 011 Flow B2 B2 Port Connected Bucket e e Self leveling Section Bottom Cylinder M 41 ...

Page 54: ...AELP028A 1 P Port A1 A1 Port Connected Boom P P Port Pump Port a Low Pressure 2 Load Check Valve Bottom Cylinder f f Divider Section b Middle Pressure 3 Boom Spool B1 81 Port Connected Boom gog Boom Section 1 to 11 011 Flow 6 Passage B Rod Cylinder 10 Lowering Divider Spool M 42 ...

Page 55: ...ydraulic oil in the bottom side flows into the valve through A1 port and is led to the passage B 6 The hydraulic oil is divided to two flows The most part of the hydraulic oil is directly led to the lowering divider spool 9 via the lowering adjuster 8 Refer to the b b The divider divides the oil flows to the bucket cylinder 29 and the surplusing oil flows to P B port 26 depending on the flows divi...

Page 56: ...b e 1 P Port 10 Lowering Divider Spool P P Port Pump Port a a Section a a 3 Boom Spool 22 Lowering Sequence Spool T T Port Tank Port b b Seetlon bob 4 Center By pass Passage 26 P B Port P B P B Port Power Beyond a Low Pressure 8 Lowering Adjuster Port b Middle Pressure 1 to 19 011 Flow e High Pressure M 44 ...

Page 57: ... e e e i ii 1 a b 3TVAAAELP015A 22 Lowering Sequence Spool A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure Rod Cylinder dod Sequence Section b Middle Pressure B2 B2 Port Connected Bucket e e Self leveling Section c High Pressure Bottom Cylinder 1 to 19 Oil Flow M 45 ...

Page 58: ...1 P Port A1 A1 Port Connected Boom P P Port Pump Port a Low Pressure 2 Load Check Valve Bottom Cylinder 1 1 Divider Section b Middle Pressure 3 Boom Spool B1 B1 Port Connected Boom g g Boom Section c High Pressure 6 Passage B Rod Cylinder 1 to 19 Oil Flow 8 Lowering Adjuster 10 Lowering Divider Spool M 46 ...

Page 59: ... hydraulic oil is divided to two flows The most part of the hydraulic oil is directly led to the lowering divider spool 9 via the lowering adjuster 8 Refer to the b b The divider divides the oil flows to the bucket cylinder 29 and the surplusing oil flows to P B port 26 depending on the flows division ratio The hydraulic oil supplied to the passage 0 12 the check valve 19 and the A2 port of the bu...

Page 60: ... c 3 Boom Spool 19 Check Valve P P Port Pump Port a a Section a a 4 Center By pass Passage 20 Passage G T T Port Tank Port bob Section bob 6 Lowering Adjuster 22 Lowering Sequence Spool P B P B Port Power Beyond a Low Pressure 10 Lowering Divider Spool 26 P B Port Port b Middle Pressure 27 T Port 1 to 20 Oil Flow c High Pressure M 48 ...

Page 61: ...ELP019A 11 41 8 b 14 Lowering OverloadRelief A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure Valve Rod Cylinder d d Sequence Section b Middle Pressure 19 Check Valve B2 B2 Port Connected Bucket e e Self leveling Section 1 to 20 Oil Flow 20 Passage G Bottom Cylinder 22 Lowering Sequence Spool M 49 ...

Page 62: ... 1 PPort A1 A1 Port Connected Boom P P Port Pump Port a Low Pressure 2 Load Check Valve Bottom Cylinder f f Divider Section b Middle Pressure 3 Boom Spool B1 B1 Port Connected Boom g g Boom Section c High Pressure 6 Passage B Rod Cylinder 1 to 20 Oil Flow 8 Lowering Adjuster 10 Lowering Divider Spool 12 Passage D M 50 ...

Page 63: ...ed into the detent position all the hydraulic oil from P port 1 is discharged through P B port 26 via the center by pass passage 4 because the center by pass passage 4 is opened On the other hand because the A1 port and B1 port are connected to the T port 27 respectively the oil in the rod side bottom side of the boom cylinder can move between the rod side and the bottom side freely so any stroke ...

Page 64: ... a bob u j i a b 13UFAAAILP017A 1 P Port 3 Boom Spool 4 Center BY pass Passage 26 P B Port 27 T Port P P Port Pump Port T T Port Tank Port P B P B Port Power Beyond Port a a Section a a b b Section bob a Low Pressure b Middle Pressure 1 to 14 011 Flow M 52 ...

Page 65: ...Figure 3 c c dod e e a b i 3TVAAAELP003B A2 A2 Port Connected Bucket B2 B2 Port Connected Bucket c c Bucket Section 8 Low Pressure Rod Cylinder Bottom Cylinder d d Sequence Section b Middle Pressure e e Self leveling Section 1 to 14 Oil Flow M 53 ...

Page 66: ...g Figure 4 f f 3TVAAAELP037A b a Low Pressure b Middle Pressure 1 to 14 011 Flow 1 P Port A1 A1 Port Connected Boom P P Port Pump Port 3 Boom Spool Bottom Cylinder f f Divider Section B1 B1 Port Connected Boom g g Boom Section Rod Cylinder M 54 ...

Page 67: ... pass passage 4 Refer to the b b via the load check valve 24 and is discharged into the opened A2 port The oil is then supplied to the bucket cylinder rod side and acts in the direction of retracting the bucket cylinder 29 As the bucket cylinder 29 retracts the oil in the bottom side flows into the valve through B2 port and is discharged from the T port 27 Refer to the c c When the bucket cylinder...

Page 68: ...k Figure 2 a a I p b b I 3UFAAAILP019A b 4 Center By pass Passage P P Port Pump Port T T Port Tank Port a a Section a a 25 Bucket Spool P B P B Port Power Beyond 1 to 10 Oil Flow bob Section bob 27 T Port Port a Low Pressure b Middle Pressure M 56 ...

Page 69: ... Cf jj a b 3TVAAAELP031A 24 Load Check Valve A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure 25 Bucket Spool Rod Cylinder d d Sequence Section b Middle Pressure B2 B2 Port Connected Bucket e e Self leveling Section 1 to 10 Oil Flow Bottom Cylinder M 57 ...

Page 70: ...k Figure 4 t t 1 Idl Wzg 8 gog b i TVAAAELPOO4C 1 PPort A1 A1 Port Connected Boom P P Port Pump Port a Low Pressure Bottom Cylinder f f Divider Section b Middle Pressure B1 B1 Port Connected Boom gog Boom Section 1 to 10 Oil Flow Rod Cylinder M 58 ...

Page 71: ...d A2 and B2 ports As a result the oil is supplied to the rod side and the bottom side of the bucket cylinder and acts in the extending direction according to the cylinder area ratio As the bucket cylinder extends the oil in the rod side flows into the valve through A2 port and joins the oil from P port 1 and is led to the bottom side again Refer to the c c During this operation the oil is not disc...

Page 72: ... Figure 2 a a bOb a i 3UFAAAILP021A 1 PPort 2S Bucket Spool P P Port Pump Port a a Section a a 4 Center By pass Passage 26 P B Port T T Port Tank Port bob Section bob 27 T Port P B P B Port PowerBeyond a l ow Pressure Port 1 to 10 011 Flow M 60 ...

Page 73: ...d d 24 e e 3TVAAAELP034A I 4 1 a S 24 Load Check Valve A2 A2 Port Connected Bucket c c Bucket Section a Low Pressure 25 Bucket Spool Rod Cylinder d d Sequence Section 1 to 10 Oil Flow B2 B2 Port Connected Bucket e e Self leveling Section Bottom Cylinder M 61 ...

Page 74: ... Bucket Dump Figure 4 1 gog 3TVAAAELP004B 7 a 1 P Port P P Port Pump Port A1 A1 Port Connected Boom f f Divider Section Bottom Cylinder gog Boom Section B1 B1 Port Connected Boom a Low Pressure Rod Cylinder 1 to 10 Oil Flow f f M 62 ...

Page 75: ...n Spring A Chamber 4 Adjusting Screw B Seat 5 Relief Valve Poppet V Middle Pressure a Throttle W10237990 Relief Valve Operation When the P port has reached the set pressure of the piston spring 3 the pressure oil in the spring chamber A opens the pilot poppet 2 and flows through the drain passage into the tank passage This lowers the pressure in the spring chamber A and the pressure difference acr...

Page 76: ...the oil is fed from the tank to eliminate the negative pressure 1 Overload Relief Valve 7 Piston Poppet 2 Control Valve 8 Lock Nut 3 Housing 9 Adjusting Screw 4 Check Valve Poppet 10 Pilot Spring 5 Relief Valve Poppet 11 Pilot Poppet 6 Piston Spring 12 Pilot Section W1023498 When the actuator port pressure is lower than the setting The cylinder port HP is applied to the seat B in the following rou...

Page 77: ...a LA1153 130 to 135 kgf cm2 i Raising relief valve 1850 to 1910 psi I 18 3 to 18 8 MPa I i LA1353 188 to 193 kgflcm2 I 2660 to 2725 psi I 19 1 to 19 6 MPa I LA1153 195 to 200 kgf cm2 i Lowering relief valve 2770 to 2840 psi 18 6 to 19 1 MPa I LA1353 190 to 195 kgflcm2 2700 to 2783 psi Oil temperature 45 to 55 C 113to 131 F 1 Piston Poppet HP High Pressure 2 Pilot Poppet LP Low Pressure 3 Piston Sp...

Page 78: ...ure above They are single rod double acting cylinder in which the reciprocating motion of the piston is controlled by hydraulic force applied to both of its ends Cylinder Specifications LA1153 LA1353 Boom Cylinder Cylinder I D 60 mm 2 36 in 70 mm 2 76 in Rod O D 35 mm 1 38 in 40 mm 1 57 in Stroke 570 5 mm 22 46 in 606 mm 23 9 in Bucket Cylinder Cylinder I D 60 mm 2 36 in 65 mm 2 56 in Rod O D 35 m...

Page 79: ...GENERAL USE SCREWS BOLTS AND NUTS S 5 2 HYDRAULIC FITTINGS S 5 3 TIGHTENING TORQUES OF SCREWS BOLTS AND NUTS ON THE TABLE BELOW ARE ESPECIALLY SPECIFIED S 6 5 DISMOUNTING FRONT LOADER FROM TRACTOR S 7 6 CHECKING DISASSEMBLING AND SERVICING S 9 1 CONTROL VALVE S 9 1 Checking and Adjusting S 9 2 Disassembling and Assembling S 11 2 BUCKET BOOM AND HYDRAULIC CYLINDERS S 23 1 Separating S 23 2 Disassem...

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Page 81: ...eassembly Apply grease to new O rings or oil seals before reassembling A Grease W1010531 3 LUBRICANTS To prevent serious damage to hydraulic system use only specified fluid or its equivalent Place Capacities i Lubricants M5040 M6040 M7040 M8540 M9540 Transmission Case 56 L 14 8 U S gals 12 3Imp gals 60L 15 9 U S gals 13 2 Imp gals KUBOTA UDT or SUPER UDT Fluid Grease fittings Until grease overflow...

Page 82: ... low add new oil to the prescribed level at the oil inlet IMPORTANT If oil level is low do not run engine 1 Dipstick A Oil level is acceptable within this 2 Oil Filling Plug range W1010960 Checking Hydraulic Hoses 1 Checking all hydraulic hoses for cuts or wear 2 If defects are found replace them 1 Hydraulic Hose 3 Magnifying Glass 2 Cardboard W1011064 3TVAAACLP003A 1 2 Check Points of Every 10 Ho...

Page 83: ...ransmission fluid Refill 8 2 Dirty relief valve Clean 8 9 10 Bucket Does Not Control valve malfunctioning Repair or replace 8 12 13 Move Bucket cylinder defective Repair or replace 8 25 Control lever cable defective Repair or replace 8 22 Hydraulic pump malfunctioning Repair or replace Oil filter clogged Clean or replace Relief valve spring damaged Replace 8 9 10 i Hydraulic hose damaged Replace 8...

Page 84: ...le Limit Relief Valve Condition Engine Speed Maximum Oil Temperature 45 to 55 C 113 to 131 F Setting Pressure LA1153 19 4 to 19 8 MPa 198 to 202 kgf cm2 2817 to 2873 psi Setting Pressure LA1353 20 4 to 20 6 MPa 208 to 210 kgf cm2 2950 to 3000 psi Piston Rod Bend 0 25 mm 0 0098 in W1013874 S 4 ...

Page 85: ... 0 to 10 8 65 to 78 M12 77 5 to 90 1 7 9 to 9 2 57 2 to 66 5 9116 122 0 to 146 4 12 4 to 14 9 90 to 108 M14 124t0147 12 6 to 15 0 91 2 to 108 5 8 176 3 to 211 5 18 0 to 21 6 130 to 156 M16 196 to 225 20 0 to 23 0 145 to 166 M18 275t0318 28 0 to 32 5 203 to 235 W1012507 2 HYDRAULIC FITTINGS Item Thread size Tightening torque N m kgf m fI lbs Adjustable elbow 9 16 37 to 44 3 7 to 4 6 27 to 33 and ad...

Page 86: ...ng nut Tie rod 7 9 mm DIA 5 16 in DIA 19 1 9 14 Relief valve assembly 40 0 to 49 5 4 1 to 5 0 29 5 to 36 5 M1610ck nut 50 to 58 5 1 to 5 9 37 to 43 Boom and bucket cylinder head LA1153 575 to 605 58 7 to 61 6 424 to 446 Boom and bucket cylinder head LA1353 250 to 280 25 5 to 28 5 185 to 206 Boom and bucket cylinder piston mounting nut LA1153 330 to 350 33 7 to 35 6 244 to 258 Boom and bucket cylin...

Page 87: ...he stands 1 to the boom 4 Rotate the stands 1 until the pin on the stand and hole in the boom are aligned Then slide the stands 1 outward and insert the spring pin 2 as shown 5 Start the engine and run at idle 6 Dump the bucket approximately 20 degrees 7 Lower the boom and raise the front wheels slightly IMPORTANT Lift the weight off the front wheels with the bucket Do not attempt to lift them wit...

Page 88: ...ydraulic control lever in all directions 2 Disconnect the four hoses with quick couplers at the control valve and place them on the right side of the boom 3 Place the protective caps and plugs on the quick coupler ends 4 Start the engine and slowly back the tractor away from the loader 1 Protective Plug W1015095 S 8 ...

Page 89: ...tion 3 Move the hydraulic control lever to DUMP position and read the pressure gauge indication when a sound indicating the relief valve operation is head 4 If the pressure is not within the factory specifications loosen the lock nut 3 then adjust by adjust screw 4 Relief valve setting Factory LA1153 19 3to 19 8 MPa 197 to 202 kgf cm2 i 2800 to 2907 psi pressure spec 20 4 to 20 6 MPa LA1353 208 to...

Page 90: ...o DUMP position and read the pressure gauge indication when a sound indicating the relief valve operation is head 4 If the pressure is not within the factory specifications loosen the lock nut 3 then adjust by adjust screw 4 Relief valve setting Factory LA1153 19 3 to 19 8 MPa 197 to 202 kgflcm2 2800 to 2907 psi pressure spec 20 4 to 20 6 MPa LA1353 208 to 210 kgf cm2 2950 to 3000 psi Condition En...

Page 91: ...P position and read the pressure gauge indication when a sound indicating the relief valve operation is head 4 If the pressure is not within the factory specifications loosen the lock nut 3 then adjust by adjust screw 4 19 3 to 19 8 MPa LA1153 197 to 202 kgflcm2 Relief valve setting Factory 2800 to 2907 psi pressure spec LA1353 20 4 to 20 6 MPa 208 to 210 kgflcm2 I I 2950 to 3000 psi Condition Eng...

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Page 93: ...ing Control Valve Assembly 1 3UFAAAILP048A Valve Cover and Cable 1 Remove the valve cover 1 2 Remove the snap pins 2 and remove the cables 3 When reassembling Length L 30 mm 1 2 in 1 Valve Cover A LA1153 Standard Valve 2 Snap Pin 8 LA1353 Standard Valve 3 Cable C Self level Valve W1013376 S 11 ...

Page 94: ...2 Remove the hydraulic pipe 6 3 Remove the control valve 5 When reassembling Tightening torque Control valve mounting bolt M10 48 1 to 55 8 N m 4 9 to 5 7 kgf m 35 5 to 41 2 ft lbs 1 Hydraulic Hose Red Tape 6 Hydraulic Pipe 2 Hydraulic Hose Blue Tape 7 Hydraulic Hose 3 Hydraulic Hose Yellow Tape 4 Hydraulic Hose White Tape A LA1153 5 Control Valve 8 LA1353 W1013522 S 12 ...

Page 95: ...orrectly referring to the figure I 1WMn uiemDn r Controillaille mounting bolt M10 3UFAAAILP105A 1 Hydraulic Hose Red Tape A LA1153 2 Hydraulic Hose Blue Tape B LA1353 3 Hydraulic Hose Yellow Tape 4 Hydraulic Hose White Tape T Connect to the Hydraulic Pipe of 5 Control Vallie Tank Line 6 Hydraulic Pipe Tank Une P Connect to the Hydraulic Hose of 7 HydrauliC Hose Pump Line Pump Line 8 Hydraulic Hose...

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Page 97: ...rring to the figure Mlenreai seffi61lng 48 110 55 8 N m Control valve mounting Tightening torque 4 9 to 5 7 kgf m bol Ml0 35 5 to 41 2 ft Ibs 1 Hydraulic Hose Red Tape A LA1153 2 Hydraulic Hose Blue Tape B LA1353 3 Hydraulic Hose Yellow Tape 4 Hydraulic Hose White Tape T Conn ct to th Hydraulic Hose of 5 Conlrol Valve Tank Lin 6 Hydraulic Hose Tank Line P Connect to th Hydraulic Hose of 7 Hydrauli...

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Page 99: ...onnect the hydraulic hoses 5 from the control valve 6 3 Remove the control valve 6 When reassembling Tightening torque Control valve mounting bolt M10 48 1 to 55 8 N m 4 9 to 5 7 Kgf m 35 5 to 41 2 ft Ibs 1 Hydraulic Hose Red Tape 4 Hydraulic Hose White Tape 2 Hydraulic Hose Blue Tape 5 Control Valve 3 Hydraulic Hose Yellow Tape 6 Hydraulic Hose W1013894 8 13 ...

Page 100: ...follows Bucket or pallet fork forward tilt Raising adjuster IN Bucket or pallet fork back tilt RaiSing adjuster OUT Typically 1 2 turn is a good increment of change 4 Tighten the lock nut with the specified torque as shown below IMPORTANT The torque for the locking nut is very important if the locking nut is over torqued it will break the adjusting screw Avoid loosening of adjustment screws by 5 t...

Page 101: ...own or negative angle is acceptable Lower the boom and loosen the lock nut then adjust by raising adjuster with the appropriate allen wrench as follows Bucket or pallet fork forward tilt Raising adjuster IN Bucket or pallet fork back tilt Raising adjuster OUT Typically 1 2 turn is a good increment of change 4 Tighten the lock nut with the specified torque as shown below IMPORTANT The torque for th...

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Page 103: ...is a good increment of change 5 Tighten the lock nut with the specified torque as shown below IMPORTANT The torque for the locking nut is very important if the locking nut is over torqued it will break the adjusting screw Avoid loosening of adjustment screws by 5 turns or more with reference to the fully tightened position because over loosening may cause loss of the screws As a guide the head por...

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Page 105: ...iibe d g difih ngi ii i ried ith 1 __ t b e llu 1 l e u Dt t L H e_a2a p Jl L2 l J 3 l ______ J 1 Remove the adapters 1 2 3 and install the plugs 4 NOTE Use the plugs 4 that has been installed on the tractor If there is no plugs 4 place an order for a tractor plugs 4 and be sure to put it on When reassembling 1 Adapter 1 A LA1153 2 Adapter 2 8 LA1353 3 Adapter 3 4 Plug W1056563 KUBOTA Corporation ...

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Page 107: ...t of change 5 Tighten the lock nut with the specified torque as shown below IMPORTANT The torque for the locking nut is very important if the locking nut is over torqued it will break the adjusting screw Avoid loosening of adjustment screws by 5 turns or more with reference to the fully tightened position because over loosening may cause loss of the screws As a guide the head portion of the adjust...

Page 108: ...le as indicated table below LA1153 LA1353 P Port 2 0 52 rad 30 0 A1 Port 1 0 79 rad 45 0 0 79 rad 45 0 A2 Port 7 0 61 rad 35 0 0 79 rad 45 81 Port 3 1 05 rad 60 0 0 79 rad 45 0 82 Port 5 0 79 rad 45 0 0 79 rad 45 0 P8 Port 6 0 17 rad 10 0 0 79 rad 45 0 T Port 4 1 57 rad 90 0 1 57 rad 90 0 IMPORTANT Attach the orifis 8 as shown in figure 1 A1 Port A LA1153 2 P Port 8 LA1353 3 81 Port C Angle of Elb...

Page 109: ...m 35 to 40 ft Ibs Install the elbow angle as indicated table below LA1153 ROPS LA1153 CABIN LA1353 ROPS and CABIN A2 Port 1 0 70 rad 40 0 Orad 0 0 0 61 rad 35 0 B2 Port 2 0 61 rad 35 0 61 rad 35 0 0 61 rad 35 0 Bl Port 3 0 87 rad 50 0 1 05 rad 60 0 1 05 rad 60 0 Al Port 5 0 87 rad 50 0 61 rad 35 0 0 79 rad 45 0 T Port 7 Orad 0 0 Orad 0 0 0 65 rad 37 0 1 A2 Port 6 PB Port 2 B2 Port 7 T Port 3 B1 Po...

Page 110: ...ol Section 1 Remove the plug 27 and take out the spring 29 and load check valve 30 2 Remove the plug 32 39 from valve body 2 d 5 6 7 8 9 11 12 13 14 1 Dust Seal 2 Valve Body 3 Back up Ring 4 O ring 5 Popel 1 6 Back up Ring 7 O ring 8 Popel 2 9 Spring 10 O ring 11 Popel 3 12 Popet 4 13 Spring 14 O ring 15 Plug 16 O ring 17 Adjusting Bolt 18 Lock Nut 19 Spool 20 O ring 21 Back up Ring 22 Collar 23 S...

Page 111: ...nd 10 1 O ring 2 Outlet Section 3 Nut 4 Boom Control Valve 5 O ring W1031202 Tightening torque Mounting nut 45N m Tie rod 9 5 mm DIA 4 6 kgf m 3 8 in DIA 33 ft Ibs Mounting nut 19 N m Tie rod 7 9 mm DIA 1 9 kgf m 5 16 in DIA 14 ft Ibs 40 0 to 49 5 N m Relief valve assembly 4 1 to 5 0 kgf m 29 5 to 36 5 fHbs 6 Bucket Control Valve 7 Tie Rod 8 Inlet Section 9 Relief Valve 10 O ring I i I 8 19 ...

Page 112: ...rts with a suitable solvent and dry with a lint free cloth or air Visually inspect all parts for signs of scoring or damage Install the spool and spacer to the valve housing 1 using care not to damage the O rings 1 Screw 17 Load Check Valve 2 Seal Plate 18 Spring 3 Wiper Ring 19 Snap Ring 4 D ring 20 D ring 5 Spacer 21 Detent Pin 6 Spacer Cap 22 Detent Ball 7 D ring 23 Detent Spring 8 Valve Housin...

Page 113: ...m the valve housing 2 5 When reassembling Clean all parts with a suitable solvent and dry with a lint free cloth or air Visually inspect all parts for signs of scoring or damage Install the spool and seal plate to the valve housing 2 using care not to damage the O rings 1 Screw 10 Spring 2 Seal Plate 11 Spool 3 Wiper Ring 12 Spring Seat 4 O ring 13 Return Spring 5 Valve Housing 2 14 Spring Seat 6 ...

Page 114: ...talling the cable end 1 to the cable 3 screw the end of cable to the cable end 1 fully When installing the controller end 7 to the cable 3 screw the end of cable to the controller end 7 fully Apply grease to the controller ends Slide portions and pivot portion Make sure that M1610ck nuts 5 are installed each cable end The length A of threaded hub of cable should be 29 to 31 mm 1 15 to 1 22 in as s...

Page 115: ...ment is pushed away slightly from the Quick Hitch 5 Lower the loader boom so that the quick hitch mounting plate clears the implement saddle 6 Back away from the implement slowly 7 If an implement is not going to be attached to the quick hitch immediately push the handles of the quick attach to the locked position to prevent damage to the handle assembly Eurotype 1 Lower the implement to ground le...

Page 116: ...ove the quick hitch frame 2 Reference 3UFAAAILP080A 1 1 i 2 I Length 8 of spring Reference 71 mm 2 80 In Length b of spring Reference 35 mm 1 38 In Length c of rod Reference 321 to 323 mm 12 64 to 12 71 in 1 Pin A Skid steer Hitch 2 Quick Hitch Frame 8 Euro Hitch W1016879 S 24 ...

Page 117: ...irmly the lock nuts The gap between the boss and the lock nut is 2 to 3 mm 0 08 to 0 12 in The hydraulic port should face inside and be careful of the direction of grease fittings Adjust the direction of hydraulic hoses so that the level indicator rod does not touch to the hydraulic hoses NOTE For fastening hydraulic hose with tube fitting 8 use two wreches Hold the fitting with a wrench turn the ...

Page 118: ...cylinder head 1 Cylinder Head 3 Cylinder Tube 2 Piston Rod Assembly 4 Adjustable Gland Nut Wrench Wl018156 Cylinder Head Piston and Nut 1 Secure the rod end in a vise 2 Unscrew the nut 4 and remove the piston 3 and cylinder head 2 from the piston rod 1 When reassembling Visually inspect all parts for signs of scoring or damage Insert the piston rod to the cylinder head using care not to damage the...

Page 119: ... 0 157 rad C 60 18 mm DIA 2 37 in DIA 70 18 mm DIA 2 76 in DIA 65 18 mm DIA 2 57 in DIA D 61 18 mm DIA 2 41 in DIA 71 18 mm DIA 2 80 in DIA 66 18 mm DIA 2 61 in DIA E 42mm 1 65 in 42mm 1 65 in 42mm 1 65 in F 10mm 0 4 in 10mm 004 in 10mm 0 4 in G 58 5 mm 2 3 in 58 5 mm 2 3 in 58 5 mm 2 3 in H 14mm 0 55 in 14mm 0 55 in 14mm 0 55 in I 35mm 1 38 in 35mm 1 38 in I 35mm 1 38 in J 7 0 122 rad 7 0 122 rad...

Page 120: ... and Piston Seal 1 Place the slide jig 2 on the piston 4 2 Install the O ring 3 on the piston using the slide jig 3 Install the piston seal 1 over the O ring using the slide jig 4 Compress the piston seal to the correct size by installing the piston into the correcting jig 5 NOTE Do not turn roll the piston seal as you install it 1 Piston Seal 4 Piston 2 Slide Jig 5 Correcting Jig 3 O ring W104435...

Page 121: ...t axle frame When reassembling Do not tighten any bolts and nuts firmly until most components are attached onto the tractor Tightening torque Front guard mounting bolt M16 197 to 225 N m 20 to 23 kgf m 145 to 166 ft Ibs Main frame mounting bolt M20 367 8 N m 37 5 kgf m 271 2 ft Ibs 1 Front Guard 3 Main Frame 2 Front Guard Mounting Bolt M16 4 Main Frame Mounting Bolt M20 W1016042 S 29 ...

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