Power Steering System - Pressure Test

Power Steering Pressure Check - V8 LHD Models

Check
1. Disconnect battery earth lead.
2. Syphon PAS fluid from reservoir.
3. Raise front of vehicle and support on stands.
4. Turn steering on LH lock.





5. Remove 3 screws securing LH splash shield and remove shield.





6. Release clip securing PAS pipes.
7. Position absorbent cloth to catch spillage.
8. Position container to collect PAS fluid spillage.





9. Release clips and remove air intake hose from air cleaner housing.
10. Discard intake 'O' ring and move intake aside for access.





11. Loosen union securing high pressure pipe to PAS pump and release pipe.





12. Fit adaptor LRT-57-034A to high pressure port of PAS pump.
13. Fit adaptor LRT-57-035 to existing high pressure hose.
14. Fit hose LRT-57-002/3 to each adaptor.
15. Fit pressure gauge LRT-57-005 to test valve LRT-57-001
16. Connect hoses LRT-57-002/3 to LRT-57-001 and tighten unions.
17. Hang pressure gauge in a safe position under bonnet.
18. Remove PAS reservoir filler cap, fill to level indicator and refit cap.
19. Connect battery earth lead.
20. Start engine and allow air to bleed from PAS system by turning steering from lock to lock. Stop engine and check PAS fluid level.
21. Ensure steering system and test equipment are free from leaks.
22. Maintain maximum fluid level during test.
23. Open the test valve on LRT-57-001 and start the engine.
24. With the engine at idle, slowly turn the steering wheel and hold on full lock.
25. Note the pressure reading on LRT-57-005.
26. Repeat the pressure check for the opposite full lock.
27. Test pressure should be between 21 and 62 bar, (300 to 900) psi. Dependant on road surface.
28. With the engine at idle, centralize the steering wheel. Pressure should read 7 bar (100 psi) or below.
29. Pressures outside the above tolerance indicates a fault.
30. To determine if fault is in steering pump or steering box, close the valve on LRT-57-001 for a maximum of 5 seconds. Pump damage may occur if test valve is closed for longer periods.
31. If gauge does not register between 75 and 103 bar, (1500 psi), (maximum pump pressure), the pump is faulty.
32. If maximum pump pressure is correct suspect the steering box.
33. On completion stop engine, disconnect battery earth lead and syphon fluid from PAS reservoir.
34. Remove test equipment from LRT-57-002.
35. Clean PAS pump and pipe union.
36. Fit new 'O' ring to high pressure pipe, align to PAS pump and tighten union to 25 Nm (18 ft. lbs.).
37. Secure PAS pipes in clip.
38. Using new 'O' ring fit intake hose to air cleaner and secure clips.
39. Remove PAS reservoir filler cap, fill to level indicator and refit cap.
40. Connect battery earth lead.
41. Start engine and allow air to bleed from PAS system, by turning steering from lock to lock.
42. Visually check PAS system for leaks.
43. Clean chassis member.
44. Check power steering fluid, if aerated, wait until fluid is free from bubbles then top-up reservoir to 'UPPER' level mark.
45. Lower vehicle.
46. Dismantle test equipment.