Overhaul

Hydraulic Power Steering Pump Overhaul

Exploded View





Special Tools Required

- Pulley Holder 07ZAB-S5A0100
- Driver Handle, 15 x 135L 07749-0010000
- Bearing Driver Attachment, 28 x 30 mm 07946-1870100

Disassembly

NOTE: Refer to the Exploded View as needed during the following procedure.

1. Drain the power steering fluid from the pump Service and Repair.

2. Remove the power steering pump Removal and Replacement.

3. Hold the steering pump (A) in a vise with soft jaws (B), hold the pulley (C) with the pulley holder (D), and remove the pulley nut (E) and pulley. Be careful not to damage the pump housing with the jaws of the vise.





4. Remove the inlet joint and the O-ring.

5. Loosen the pressure control valve cap, and remove the cap, the O-ring, the valve spring, and the pressure control valve.

6. Remove the pump housing cap, the O-ring, and pump preload spring.

7. Remove the pump cover, the O-ring, and the pump cover seals.

8. Pull out the roll pin.

9. Remove the outer case, the cam ring, the rotor, the vanes, and the side plate.

10. Remove the rubber seal and slipper seal from the outer case.

11. Remove the O-rings from the bottom of the housing.

12. Remove the 40 mm internal snap ring, then remove the driveshaft by tapping the shaft end with a plastic hammer.

13. Remove the pump seal from the pump housing.

Inspection

14. Check the pressure control valve for wear, burrs, and other damage to the edges of the grooves in the valve.





15. Inspect the bore of the pressure control valve on the pump housing for scratches and wear.

16. Slip the pressure control valve back into the pump housing, and check that it moves in and out smoothly. If OK, go to step 17, if not, replace the pump as an assembly. The pressure control valve (A) is not available separately.






17. Attach a hose (A) to the end of the pressure control valve (B) as shown. Then submerge the pressure control valve in a container of power steering fluid (C), and apply compressed air in the hose.

- If air bubbles leak through the valve at less than 98 kPa (1.0 kgf/cm2, 14.2 psi), replace the pump as an assembly. The pressure control valve is not available separately.
- If the pressure control valve is OK, set it aside for reassembly later.





18. Inspect the ball bearing by rotating the outer race slowly. If you feel any play (axial or radial) or roughness, remove the faulty ball bearing (A), and install a new ball bearing (B).





19. Inspect the driveshaft by rotating the inner race slowly. If you feel any play (axial or radial), remove the worn driveshaft (C), and install a new driveshaft (D).

Reassembly

20. Install the new pump seal (A) (with its grooved side facing in) into the pump housing (B) by hand first, then drive it in using the driver handle and bearing driver attachment until there is no step at the top of the pump seal, and the seal is fully seated in the pump housing.






21. Position the pump driveshaft (A) in the pump housing, then press it in with the appropriate size socket (B) as shown.





22. Install the 40 mm internal snap ring (C) with its beveled edge facing out.

23. Coat the new 23.8 mm O-ring (A) with power steering fluid, then position it on the bottom (B) of the pump housing.






24. Coat the new pump cover seals (A) and a new 13.0 mm O-ring (B) with power steering fluid, then position them into the grooves on the pump cover (C).

NOTE: Be careful not to install the inlet joint 13.0 mm O-ring because they are the same size.






25. Install the outer case (A) by aligning the slot (B) inside the outer case with the cover roll pin hole (C). Be sure that the tapered side (D) of outer case is facing up.





26. Apply power steering fluid to the new rubber seal (E) (black), and install it in the slot (F) of the outer case.

27. Apply power steering fluid to the new slipper seal (G) (white), and install it on top of the rubber seal you just installed.

28. Install the cam ring (A) by aligning the slot (B) with the slot (C) in the outer case.





29. Insert the roll pin (D) into the slots between the cam ring and outer case, then push the roll pin into the set hole (E).

30. Install the rotor (A) in the cam ring (B).





31. Set the 11 vanes (C) into the grooves in the rotor. Make sure that the round ends (D) of the vanes are in contact with the sliding surface of the cam ring.

32. Place the side plate (A) on the cam ring, and align the roll pin set hole (B) with the roll pin (C).





33. Coat the new 51.0 mm O-ring (D) with power steering fluid, and install it into the groove in the side plate.

34. Install the pump housing (A) over the cover assembly (B).






35. Align the bolt holes in the cover (A) with the threaded holes in the pump housing. Install the flange bolts loosely first, then torque the flange bolts in a criss-cross pattern in two or more steps.






36. Push in the cam ring (A) from the pump housing cap hole (B) with a flat-tip screwdriver to make sure the cam ring is fully seated against the outer case.






37. Install the pump preload spring (A) in the pump housing.





38. Coat the new 12.7 mm O-ring (B) with power steering fluid, and install it on the pump housing cap (C).

39. Install the pump housing cap on the pump housing, and tighten it to the specified torque.

40. Install the pressure control valve spring (A) in the pump housing.





41. Coat the pressure control valve (B) with power steering fluid, and install it in the pump housing.

42. Coat the new 16.7 mm O-ring (C) with power steering fluid, and install it on the pressure control valve cap (D).

43. Install the pressure control valve cap on the pump housing, and tighten it to the specified torque.

44. Coat the new 13.0 mm O-ring (A) with power steering fluid, and install it on the inlet joint (B).





45. Install the inlet joint on the pump housing.

46. Install the pulley (A), then loosely install the pulley nut (B). Hold the steering pump in a vise with soft jaws (C). Be careful not to damage the pump housing with the jaws of the vise.





47. Hold the pulley with the pulley holder, and tighten the pulley nut to the specified torque.

48. Check that the power steering pump turns smoothly by turning the pulley by hand. If it is hard to turn, loosen the four flange bolts on the cover, then retighten them in the same manner as in step 35 Overhaul. Retest the pump for smooth rotation. If the pump is still hard to turn, replace the pump.

49. Reinstall the power steering pump Removal and Replacement.