Assemble
AssembleNOTE:
Before assembly, lubricate all parts with oil.
Replace all O-rings.
With a new flow control valve, ensure that the pressure relief valve is at the correct opening pressure..
NOTE:
For application identification refer to "Steering : Power Steering Pump : Service and Repair : Overhaul Procedures : Application and ID" Application and ID
21. Clamp flow Control valve (2c) in the vise at an unground section.
Insert sealing cone compression spring (2d) and sealing cone (2f) and screw on valve screw (2e). The valve must slide easily in the housing bore.
22. Insert compression spring (2j) and flow control valve (2c) in pump housing (2).
23. Press radial seal ring (4e) up to the stop using a suitable mandrel (arrow).
24. Insert O-ring (4f) and shaped wedge (g) in bearing flange.
25. Place O-ring (5b) around piston support ring (5).
Mounting ZF piston support ring:
Press piston support ring (5) into bearing flange housing (2).
Ensure that centering pin (5e) is exactly above the centering bore (arrow).
Mounting Vickers/LUK piston support ring:
Before inserting the piston support ring with the drive shaft, pre-assemble as follows:
a) Insert piston spring (5d) and piston (5c) in piston support ring (refer to number 27).
b) Insert bearing shell (5g) (refer to number 28).
c) Insert bearing sleeve (5f).
d) Insert drive shaft (11) in bearing flange cover (refer to number 30).
e) Push drive shaft into the bearing sleeve/bearing shell (5g. 5f). Mount locking ring.
f) Insert piston support ring with drive shaft in the pump housing (refer to number 31).
26. ZF: Insert spacer washer (5h).
27. Insert piston spring (5d) and piston (5c) in piston support ring.
28. Place bearing shell (5g) diagonally in front of two pistons.
Carefully press remaining pistons together in the piston support ring using an Allen wrench or similar tool, while pressing the bearing shells using the fingers.
Mount O-ring (5a).
29. Insert bearing sleeve (5f) in bearing shell (5g).
CAUTION: Insert side milled on both sides upwards.
30. Push drive shaft (11) through radial seal ring (4d) in bearing flange cap (4a).
31. Insert drive shaft (11) with boaring flange cap (4a) into pump housing (2a). At the same time turn shaft carefully until the eccentric (arrow) of the drive shaft can be pushed into the bearing sleeve (5f).
32. Fasten bearing flange cap (4a) with 8 screws MS (4c).
Tightening torque: 10 Nm.
33. Push rotor onto the drive shaft so that the chamfer on the inside diameter (arrow) points towards bearing flange cap (4a).
34. Mount new locking ring (11a). The locking ring must seat correctly in the groove (arrow) of the drive shaft.
35. Insert vanes (7a, 10 vanes) in the rotor (7). Insert vanes with the rounded. metallic glossy sides towards the cam insert in the rotor.
36. Insert straight pins (6a) with the punched end (arrow) in the bores of the cam insert (6) so that they project on both sides of the cam insert.
37. Insert cam insert (6) with direction of rotation arrow upwards on the bearing flange (4). At the same time the straight Pins (6a) must be above the centering bores (arrow).
38. Insert seal (8a) and shaped wedge (8b) in pressure plate (8).
Mount pressure plate (8) with the ground surface towards the cam insert.
Insert O-ring (4h) in bearing flange (A).
39. Insert bearing flange (4) in pump housing (2) and fasten with 4 bolts M8 (4b).
Tightening torque 25 Nm.
Note models 129.066/067, 140.04/050/051
Insert O-ring (2g) mount end cover (2k) and tighten with four bolts (arrow).
Tightening torque: 8 Nm.
Screw tandem pump (1) onto support (1a) with bolts (46). Screw on oil hose (arrow). Work step number 40 is omitted.
Note models 129.076, 140.056/057
Insert O-ring (2g), screw on oil reservoir (35) with bolts (35a).
Tightening torque: 8 Nm.
Work step number 40 is omitted.
40. Insert O-ring (2g), mount reservoir (35) on pump housing and screw on with bolts (35a. 4 bolts).
Tightening torque: 8Nm.
Insert filter package (35h) and spring (35g), compress slightly and tighten with new self-locking nut (35e).
Mount end cover (35d) and screw on bleed cap (35c).
After installing the tandem pump (operation no. 46-0710), fill or bleed systems (40-0715). Check tandem pump for operation and leaks, connect pressure gauge if required and check pump pressure (operation no. 46-3070).