S15/T15 2WD Jimmy V6-173 2.8L (1988)
Power Steering Pump: Service and Repair
Disassembly/Assembly
Flushing Power Steering System
1.
Raise front end of vehicle off ground until wheels are free to turn.
2.
Remove fluid return hose at pump inlet connector and plug connector port on pump. Position hose in large container.
3.
While an assistant is filling reservoir with new power steering fluid, run engine at idle. turn steering wheel from stop to stop. Do not contact
wheel stops or hold wheel in a corner as fluid will stop and pump will be in pressure relief mode. A sudden overflow from reservoir may
develop if wheel is held at a stop.
4.
Install all pipes and hoses. Fill system with new power steering fluid and bleed system as outlined under SYSTEM BLEEDING.
5.
Operate engine for 15 minutes.
6.
Remove pump return hose at pump inlet and plug connection on pump. While refilling reservoir, check draining fluid for contamination. If foreign
material is still evident, replace all hoses, disassemble and clean or replace power steering system components. Do not reuse any drained power
steering fluid.
Disassembly
Fig. 2 Exploded view of power steering pump
Refer to Fig. 2, when servicing pump.
Before disassembly of pump, remove filler cap and drain fluid. If broken components or foreign materials are found during disassembly,
hydraulic system should be disassembled, inspected, cleaned and flushed before servicing is complete.
1.
Clean exterior of pump with solvent and crocus cloth.
2.
Remove bolt and fitting from rear of pump reservoir, then the reservoir and seals.
3.
Remove end plate retaining ring using a screwdriver and punch.
4.
Remove end plate and pressure plate spring, then the O-ring, control valve and control valve spring by inverting housing.
5.
Tap lightly on driveshaft with a rubber mallet to remove pressure plate.
6.
Pull out pump ring and vanes, then remove shaft retaining ring, pump rotor and thrust plate.
7.
Remove driveshaft key from slot in shaft, then with end of shaft pointed downward, press down until shaft is free.
8.
Remove seals, dowel pins and O-rings.
Inspection
1.
Clean all parts with solvent and blow dry.
2.
Check vane tips for scoring or wear. Vanes must fit snugly but slide freely in slots of rotor. Examine rotor slots for burrs and excessive wear at
thrust faces.
3.
Check inner surface of pump ring for scoring or wear and thrust plate and pressure plate for wear on plate surfaces.
4.
If heavy wear is evident in any of above components, replace entire rotating group.
5.
Inspect seal for leakage, cracking or swelling, if evident replace seal.
6.
Check driveshaft for excessive burning or scoring.
7.
Control valve must move smoothly in the valve bore.
Assembly
