Power steering system - test procedure

POWER STEERING SYSTEM - TEST Procedure

• NOTE: If steering lacks power assistance.
• Check pressure of hydraulic pump before
• fitting new components. Use fault
• diagnosis chart to assist in tracing faults.

A. Steering box. Checks should be carried out on both full lock B. Steering pump. positions. C. Existing hose, steering box to pump. D. Hose LRT-57-030. E. Test adaptor LRT-57-001. F. Pressure gauge LRT-57-005. G. Thread adaptor LRT-57-004. possibly damaging seals. H. Thread adaptor LRT-57-022.

10. Release steering wheel and with engine idling.
11. If pressures differ to those given a fault exists.
12. To determine if fault is steering box or pump.
13. If gauge does not register specified pressure,
14. Fit a new pump, bleed system and repeat test. If
1. A hydraulic pressure gauge and test adaptor is used to test power steering system. This gauge₂₂ is able to measure 140 kgf/cm , 2000 lbf/in . The maximum power steering system pressure₂₂ is 77 kgf/cm , 1100 lbf/in .
2. Some fault conditions of hydraulic pump may₂₂ obtain pressures up to 105 kgf/cm , 1250 lbf/in . Pressure on gauge is same pressure being exerted upon steering wheel. When testing, turn steering wheel gradually while reading pressure gauge.
3. Check and maintain maximum fluid level of reservoir.
4. Examine power steering units and connections for leaks. All leaks must be rectified before attempting to test the system.
5. Check steering pump drive belt tension See ENGINE, Repair, Drive Belt .
6. Assemble test equipment and fit to vehicle, as shown in RR3959M.
7. Open tap of adaptor.
8. Bleed system, take care not to overload pressure gauge.
9. With system in good condition, pressures should be: (A) Steering wheel held on full lock and engine₂ running at 1,000 rev/min, 70 to 77 kgf/cm₂ , 1000 to 2000 lbf/in . (B) Steering wheel held on full lock and engine₂₂ idling, 28 kgf/cm , 400 lbf/in .

• CAUTION: Do not maintain this pressure
• for more than 30 seconds in any one
• minute to avoid overheating fluid and

Pressure should read below 7 kgf/cm₂², 100 lbf/in .

Close adaptor tap for a maximum five seconds.

pump is faulty.

low pressure or a substantial imbalance exists, fault is in steering box valve and worm assembly.