Pump Overhaul

Pump Overhaul

Pump:

Disassembly

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

1. Drain the fluid from the pump.
2. Remove the power steering pump.
3. Remove the inlet joint and O-ring.
4. Loosen the flow control valve cap with a hex wrench, and remove it and the O-ring, the flow control valve and spring.
5. Remove the pump cover and pump cover seal.
6. Remove the snap ring, then remove the outer side plate, cam ring, rotor, vanes, side plate, and O-rings.
7. Remove the snap ring, then remove the pump driveshaft by tapping the shaft end with the plastic hammer.
8. Remove the seal from the pump housing.

Inspection
9. Check the flow control valve for wear, burrs, and other damage to the edges of the grooves in the valve.





10. Inspect the bore of the flow control valve on the pump housing for scratches and wear.
11. Slip the flow control valve back in the plump housing, and check that it moves in and out smoothly. If OK, go to step 12; if not, replace the pump as an assembly. The flow control valve (A) is not available separately.





12. Attach a hose (A) to the end of the flow control valve (B) as shown. Then submerge the flow control valve in a container of power steering fluid or solvent (C), and blow 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 flow control valve is not available separately.
^ If the flow control valve is OK, set it aside for reassembly later.





Reassembly
13. Install the oil seal (A) (with its grooved side facing in) into the pump housing by hand first. Press the oil seal with the appropriate size socket wrench (B) as shown.





14. Install the pulley (with pump driveshaft) in the pump housing.
15. Coat the new 16.8 mm O-ring (A) with power steering fluid, and position it in the bottom of the pump housing.





16. Coat the new 47.2 mm O-ring (A) with power steering fluid, and position it in the bottom of the pump housing.





17. Set the plate (B) with its H mark (C) facing up, and align the slot (D) in the pump housing.
18. Set the pump cam ring (A) with its MS mark (B) facing down, and align the slot (C) in the pump housing.





19. Assemble pump rotor (A) to the pump housing (B) with its A mark (C) facing up.





20. Set the 10 vanes (D) in the grooves in the rotor.
21. Install the snap ring (A).





22. Coat the new pump cover seal (A) with power steering fluid, and position it in the pump housing.





23. Install the pump cover (B) in the pump housing. Torque the bolts in a crisscross pattern in two or more steps.
24. Coat the flow control valve (A) with power steering fluid, then install it and the spring (B) in the pump housing.





25. Coat the new 19.8 mm O-ring (C) with power steering fluid, and install it on the flow control valve cap (D), then install the cap on the pump housing, and tighten it to the specified torque.
26. Coat the new 15.8 mm O-ring (A) with power steering fluid, and install it on the inlet joint (B). Install the inlet joint on the pump housing.





27. Check that the pump turns smoothly by turning the pulley by hand. If it turns hard, loosen the four flange bolts on the cover, then retighten them in same manner as in step 23. Turn the pump again by hand.