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Power Steering - Pressure Test: Check

  1. Position absorbent cloth to catch spillage.
  2. Remove bolt securing PAS high pressure pipe clip to PAS pump.
  3. Loosen union securing high pressure pipe to PAS pump and release pipe.
  4. On K1.8 models: Fit adaptor LRT-57-034A to high pressure port of PAS pump.
  5. On KV6 & Td4 models: Fit adaptor LRT-57-042 to high pressure port of PAS pump. See Fig 1.
    6. Fig 1: Identifying PAS Pressure Testing Adaptors
    G00386378Courtesy of LAND ROVER NORTH AMERICA, INC.
  6. Fit adaptor LRT-57-035 to existing high pressure hose.
  7. Fit hose LRT-57-002 to each adaptor.
  8. Fit pressure gauge LRT-57-005 to test valve LRT-57-001.
  9. Connect hoses LRT-57-002 to LRT-57-001 and tighten unions.
  10. Ensure steering system and test equipment is free from leaks.
  11. Maintain maximum fluid level during test.
  12. With the test valve open, start the engine.
  13. Pressure at idle should be between 5-7 bar (72.5-101.5 psi).
  14. With the engine at idle, slowly turn the steering wheel and hold on full lock.
  15. Repeat procedure for other side.
  16. Test pressure should rise significantly as steering wheel is rotated and continue to rise as full lock is approached. Full lock pressures should be 90-100 bar (1305-1450 psi).
    NOTE: Maximum operating pressure is limited by pressure relief valve in pump.
  17. With the engine at idle, release steering wheel. Idle pressure 5-7 bar (72.5-101.5 psi).
  18. Pressures outside the above tolerance indicates a fault.
  19. To determine if fault is in steering pump or steering rack, close the test valve for a maximum of 5 seconds.
    CAUTION: Pump damage will occur if test valve is closed for longer periods.
  20. If gauge does not register correct reading, suspect faulty pump.
  21. If PAS pump pressure is correct and steering is heavy at idle and becomes light as engine RPM is increased, suspect pump flow rate.
  22. If maximum pump pressure is correct, suspect steering rack.
  23. On completion stop engine and remove test equipment.
  24. Clean PAS pump and pipe union.
  25. Fit NEW "O" ring to high pressure pipe, align to PAS pump and tighten union to 25 Nm (18 ft. lbs).
  26. Fit bolt securing high pressure pipe clip and tighten to 8 Nm (6 ft. lbs).
  27. Check and top-up PAS fluid level. See POWER ASSISTED STEERING (PAS) SYSTEM - BLEED .
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