Assemble

Assemble

NOTE:
- Before assembling, moisten all parts with oil.
- Replace all O-rings.
- If fitting a new flow control valve, pay attention to the correct opening pressure of the overpressure valve.

NOTE:
For application identification refer to "Steering : Power Steering Pump : Service and Repair : Overhaul Procedures : Application and ID" Application and ID


Steps 1 - 25 are contained within the "Disassemble" article.




26. Assemble flow control valve (32), carefully insert together with spring (30) into the pump housing (2) and secure with locking ring (34a). The valve must slide easily in the bore of the housing.




27. Press in radial seal ring (28) as far as the stop with a suitable mandrel.




28. Press spacer ring (27) into the housing (4) with groove facing seal.




29. Press radial seal ring (13) into the bearing flange (14) using a suitable mandrel (030). Fit on O-ring.
Carefully insert drive shalt into bearing flange.




30. Fit thrust washer (12) and eccentric (15a) onto the drive shaft. Secure eccentric with pin (17).
Knock pin as far as the stop.




31. Push oiled sleeve (15b) over the eccentric (15a).




32. Carefully insert drive shaft (11) together with bearing flange (14) into the housing (do not damage seal). Ensure that the groove for the roll pin (19) is parallel to the roll pin bore. Knock roll pin (19) into the housing.




33. Insert spring (38) and piston (37) into the screw cartridges (40).
Piston and housing must always be matched to each other.




34. Screw all 4 screw cartridges (40) into the housing in the consecutively numbered order shown in number 10, 40 ± 5 Nm. Use pronged wrench 129 589 02 07 00.




35. Insert thrust washer (5) and O-ring (22) into the housing. Bronze-coated side of the thrust washer (5) must be installed facing the rotor.




36. Fit rotor onto the drive shaft so that the chamfer on the inner diameter (arrow) is facing the thrust washer.




37. Install new locking ring (18). The locking ring (18) must be correctly seated in the groove of the drive shaft.




38. Insert vanes (10 off) into the rotor with the rounded metallic glossy sides (arrow) facing the cam insert.




39. Insert straight pins (20), then introduce cam insert (6) into the straight pins with the cast direction of rotation arrow (arrow) facing upwards.




40. Fit pressure plate (3) with the ground face pointing toward cam insert (6).
Fit O-rings (26b) onto the pressure plate with grease.




41. Insert bearing flange in the pump housing and attach with the hexagon bolts (25). Tightening torque 30-35 Nm.




42. Insert new O-ring (21), then fit on fluid reservoir (35) and attach with bolts (36). Tightening torque 8 Nm.




43. Insert filter set (41), spring (43) and plastic sleeve (60). compress slightly and install new self-locking nut (61). Fit on end cover (45), screw on breather cap.
44. After installing tandem pump check for proper operation and signs of leaks. Connect pressure gauge, if necessary, and test delivery pressure of the power circuit. Fill or bleed system.