Checking Operation of Power Steering With Out H-31 System
CHECKING FUNCTION OF POWER STEERING PUMPCheck all hose connections, pump and steering gear for leaks before testing.
1. Checking Power Steering Pump:
Connect pressure tester between pump and steering gear.
1. Pump connection
2. Steering gear Connection
A. Shutoff valve (low pressure) 0 to 15 bar (0 to 213 psi).
B. Shutoff valve (high pressure) 0 to 150 bar (0 to 2133 psi).
Shut valve (A).
Open valve (B).
Start engine.
Correct hydraulic fluid level in tank.
Shut valve (B) max. 10 seconds and read the pressure.
The rated pump pressure 110 to 120 bar (1565 to 1705 psi) must be reached within ± 10
If the rated pressure 110 to 120 bar (1565 to 1705 psi) is exceeded, replace power steering pump.
If the rated pressure 110 to 120 bar (1565 to 1705 psi) is not reached, check drive belt tightness.
Repeat test
If the rated pressure 110 to 120 bar (1565 to 1705 psi) is still not reached replace steering pump.
2. Checking Power Steering:
Pressure tester connected between pump and steering gear, system bled, valve (B) opened, valve (A) Shut, engine not Started.
Lift car.
Stop steering from reaching final left lock by 1/2 to 3/4 steering wheel turn with a piece of wood or something similar.
Start engine.
Pull steering wheel against final left lock with a force of 100 N (22 lbs.)(force meter) about 5 seconds and read the pressure.
Limit final right lock and repeat test on right lock.
If pressure values are lower than pump pressure determined In point 2, replace the steering gear.
3. Checking Mech. Play of Steering:
Pressure point adjusted
No play in steering column.
Pressure tester between pump and steering gear.
System bled.
Valve (B) opened.
Valve (A) shut.
Engine not started.
Steering drop arm held In straight ahead position with Special Tool 32 4 060.
Paste strips of paper on the steering wheel hub and casing upper section. Make mark (center) on steering wheel hub.
Start engine.
Open valve (A).
Read flow pressure.
Turn steering wheel counterclockwise until pressure tester shows 1 bar (14 psi) more pressure than the flow pressure value.
Mark position of the steering wheel hub.
If max. permissible travel (C) = 7 mm (0.276") is exceeded, replace the steering gear.
Remove special tool holder and pressure tester.
Bleed hydraulic system and, if necessary, add hydraulic fluid.