Disassembly

1. Drain power steering fluid, then remove gearbox shield.
2. Using suitable flare nut wrenches, disconnect four hydraulic lines from valve body.
3. Remove two valve body to gearbox attaching bolts.
4. Remove O-rings and port orifices from gearbox.

Fig. 16 Exploded View Of Control Valve Body Unit:

5. Remove three valve body cap to valve body attaching bolts, Fig. 16.
6. Remove pressure control valve and spring from valve body.
7. Remove pressure control valve and spring from valve body, then check pressure control valve surface for any scoring or scratches. Slip it back into valve body, and ensure it slides smoothly without drag and without side play.
8. Remove gain control valve and spring from valve body.
9. Inspect gain control valve surface for any scoring or scratches, then slip valve back into valve body and ensure it slides smoothly without drag or side play.
10. Separate valve body and port housing.
11. Remove rollers from control valve by pushing valve out one side of valve body, then the other. When removing rollers, hold plungers with your fingers to keep them from popping out.
12. Remove plungers, return springs and 4-way valve from valve body.
13. Remove O-ring from 4-way valve.
14. Inspect plunger surface for any scoring or scratches, then slip each plunger back into valve body and ensure it slides smoothly without drag or side play.
15. Inspect 4-way valve surface for any scoring or scratches, then slip 4-way valve back into valve body and ensure it slides smoothly without drag or side play.
16. Using 1/64 inch drill bit, remove sensor orifice and O-ring from valve body.