Danfoss Series 20, Service Manual And Repair Instructions

Page 1: ...powersolutions danfoss com MAKING MODERN LIVING POSSIBLE Service Manual and Repair Instructions Axial Piston Motors Series 20...

Page 2: ...her forms of contamination are in most cases the reason for the breakdown of a hydraulic unit Please pay attention to cleanliness not only when making repairs but also when putting the unit into opera...

Page 3: ...oil 11 Leak Test 11 Cleanliness 11 Checking the oil level 11 Recommended oils 11 Transmission Operates in one Direction Only 12 System Response is sluggish 12 System Operating hot 13 System will not o...

Page 4: ...construction at present A1 S M F 2 B A 1 Series of product SMF motor fixed 2 association type 20 Orientation of rotation B reversible Input port working port SAE flange 3 3000 psi SAE J518 207 bar fo...

Page 5: ...ner seal Major repairs should not be carried out during the warranty period y y Right angle screw driver 16 mm y y Set of drifts 2 to 10 mm y y Plastic hammer large y y Bearing puller 80 x 120 mm y y...

Page 6: ...llation and Information Recommended Tools and Installation Gauge Information A Charge Pressure 60 bar 870 psi Gauge 7 16 20 UNF O ring Fitting B System pressure 600 bar 8700 psi Gauge 7 16 20 UNF O ri...

Page 7: ...inlet pressure of less than 0 5 bar 7 3 psi absolute 0 5 bar 7 3 psi is not permissible The filter requires changing or the operating temperature is too low Venting the pump and motor housing as well...

Page 8: ...ommended oil through the drain port 4 Fill the oil reservoir with fluid As soon as oil emerges from the end of the discon nected charge pump inlet line tighten the pipe connector see table to page 27...

Page 9: ...ssure should now be 15 bar 217 6 psi 14 Slowly move the control handle backwards and forwards If the pump is working properly the charge pressure drops by about 2 bar 29 psi from the value stated in s...

Page 10: ...SHAFT MOTOR SWASHPLATE FIXED DISPLACEMENT MOTOR LOOP FLUSHING VALVE PURGE RELIEF VALVE CHARGE PRESSURE RELIEF VALVE SERVO PRESSURE RELIEF VALVES SERVO CONTROL CYLINDER SERVO CONTROL CYLINDER PUMP SWAS...

Page 11: ...Important Use only recommended oils See Fluid Manufacturers Technical Information It is not permissible to mix oils Carry out a leak test on the transmission inlet line filter pipe and hose lines and...

Page 12: ...ion Inspect control valve see Series20AxialPiston Pumps Service Manual and Repair Instruction Inspect motor by pass valve if used Replace control valve see Series20AxialPiston Pumps Service Manual and...

Page 13: ...ction OK Inspect charge pump see Series20AxialPiston Pumps Service Manual and Repair Instruction Inspect inlet filter Repair or replace see Series20AxialPiston Pumps Service Manual and Repair Instruct...

Page 14: ...fication Troubleshooting When the problem occurs in one direc tion only interchange the relief valve cartridges to see if the problem changes to the other direction If so one relief valve cartridge is...

Page 15: ...nd rear of the motor body It is recommended that an mounting block should be used in order to facilitate a profes sional operation The shuttle spool must be easily movable in the bore Any wear dirt or...

Page 16: ...ions L1003443 Rev BA Jun 2014 16 Disassembly and Assembly Sectional View P005 118E Output shaft Shaft seal Cylinder block assembly High pressure relief valves adjustable Purge relief valve Valve block...

Page 17: ...7 Hexagonal screw 25 Cylinder block 105 Back up ring 8 Hexagonal screw 26 Retainer guide 106 O ring 9 Washer 27 Slipper retainer 107 Back up ring 10 End cap 28 Piston assembly 118 O ring 11 Shim 29 Sw...

Page 18: ...o the I D of the bronze rotating ring Lubricate the large O ring and place the O D of the seal stationary Utilize the lifting gear and mounting block in accordance with the fitting instructions on pag...

Page 19: ...onto the shaft pilot diameter with the O ring facing the unit Work the ring into place using hand force only C Caution Protect parts from damage by the shaft Compress the seal stationary to expose th...

Page 20: ...are sealed with O rings and the two 2 adjacent ports also have back up rings on top of the O rings These are rectangular in cross section and slightly cupped on one side where they mate with the O ri...

Page 21: ...l and manifold are a select fit and must be replaced together Washer Shuttle spool To install slide the spool into the bore place a washer on each end then slide both springs In place Install the hex...

Page 22: ...tory set and the three 3 numbers of the pressure setting are stamped on the end of the cartridge These valves are interchangeable and can be installed in either side of the manifold providing the pres...

Page 23: ...ce on the end cap and remove both parts together If the valve plate remains on the bearing plate remove it at this time All surfaces must be treated with the greatest care Any damage to the surfaces m...

Page 24: ...the exposed surfaces with clean oil Install the pilot ring and the locating pin in the cylinder block Assemble the bearing race shim if required and locating pin in the end cap Lubricate the end cap f...

Page 25: ...The tapered bearing must now be removed from the shaft A bearing puller should be used that will pull against the inner race of bearing Protect the cylinder block face during this operation Install tw...

Page 26: ...e exchanged If the swash plate is removed the motor shaft can also be removed If the bearings are damaged the bearing cup in the motor housing as well as the bearing on the shaft must be changed Depen...

Page 27: ...nd press the bearing onto the shaft with the center screw of the puller bar A spacer must be used between the center screw and the bearing The bearing must be pressed on until it rests on the shoulder...

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