Steering: Testing and Inspection

Checking Function Of Power Steering Vane Pump (High)

Before checking all hose connections, check pump and steering gear for leaks.

Caution! Make sure all parts are absolutely clean. No dirt is allowed to enter the system.





Disconnect pressure line from pump and connect to special tool 32 4 000 connection (2).
Connect special tool 32 4 104 with banjo bolt and 2 sealing rings to special tool 32 4 000 connection (1).
Screw special tool 32 4 104 into pump.
Pump connection (1)
Steering gear connection (2)






Checking pump pressure:
1. Close valve (A).
2. Open valve (B).
3. Start engine.
4. Correct hydraulic fluid level in tank, refer to Steering Bleeding Power Steering Unit.
5. Heat hydraulic fluid to approx. 50° C by moving steering wheel at increased engine speed.
6. Close valve (B) for max. 10 seconds and read pressure.
If nominal pump pressure, refer to Steering Specifications, is exceeded by more than 10%, replace vane pump.
If nominal pump pressure, refer to Steering Specifications, is undershot by more than 10%, check V-ribbed belt tension.
If V-ribbed belt tension is O.K., replace vane pump.

Checking power steering:
1. Engine not started.





2. Limit steering lock 1/2 - 3/4 steering wheel turns before reaching the left limit stop (wood etc.).
3. Open valve (B).
4. Close valve (A).
5. Start engine.





6. Pull steering wheel with special tool 64 1 100 at 100 N for approx. 5 secs. against left lock and read off pressure.
7. Limit right limit stop and conduct measurement at right limit position.
If the pressures are below the previously determined nominal pump pressure, it is necessary to replace the steering gear.

Installation:
Remove special tool 32 4 000 and replace sealing rings on banjo bolts.
Tightening Torque, refer to Steering Specifications.
Bleed power steering, refer to Steering Bleeding Power Steering Unit.