Checking Operation of Power Steering

- Engine at operating temperature.

- Check hydraulic fluid level in tank.

- Check all hose connections and equipment (pump, brake booster, power flow regulator and steering gear) for leaks before checking operation.

Discharging Pressure:

- Operate brake pedal about 20 times with engine stopped.





- Install pressure tester 32 4 000 between pump and power flow regulator.

1 = Power flow regulator or steering gear connection.

2 = Pump connection.





A = Shutoff valve (low pressure: 0 to 15 bar or 213 psi).

Caution! Shutoff valve (A) must always be closed for high pressure tests to avoid damaging pressure tester.

B = Shutoff valve (high pressure: 0 to 150 bar or 0 to 2133 psi).

- Open valve (B).

- Close valve (A).

- Start engine - fill hydraulic fluid in tank.

Bleeding System:

- Turn steering wheel two times each against left and right locks.

- Operate brake pedal 5 times, wait 30 seconds and operate pedal another 5 times.

- Hydraulic fluid temperature should be approx. 50° C (122° F) for all tests.

- Turning steering wheel against locks with engine running could cause a rise in temperature.

1. Checking flow Pressure:

- Open valve (B).

- Close valve (A) and run engine.

- Open valve (A) and read pressure when pressure is less than 15 bar (213 psi).

- Max. permissible flow pressure of 8 bar (114 Psi) must not be exceeded.

- Pressure Greater Than 8 Bar (114 psi):

Checking Power Flow Regulator and Steering Gear

- Discharge pressure.

- Install pressure tester between power flow regulator and steering gear.

- Bleed system.

- Carry out test as described above.

- If pressure is less than 8 bar (114 psi), replace power flow regulator.

- If presure is more than 8 bar (114 psi), replace steering gear.

- Recheck flow pressure between pump and power flow regulator.