Hydraulic Pressure Testing Without H-31 System
CHECKING POWER STEERING PUMPCars Without H-31 System;
1. Power Steering Pump:
-Engine At Operating Temp-
Disconnect pressure line (1) on power pump and connect it on pressure tester 32 4 000.
Connect pressure line (2) from pressure tester 32 4 000 on power pump.
Installation:
Tightening torque 45 Nm. (32.5 ft. lbs.).
Bleed hydraulic system.
Test;
Valve (A) must always be closed for high pressure tests (pressure tester would be damaged!).
Open valve (B) and bleed hydraulic system.
Close valve (B) max. 10 seconds with engine running and read pressure.
Rated pump pressure 110 to 120 bar (1565 to 1705 psi.) must be reached with a tolerance of max. - 10%.
If this pressure is not reached, check drive belt tightness.
If pressure is still not reached, Replace power steering pump.
2. Power Steering:
Lift car.
Stop steering from reaching final left lock by 1/2 to 3/4 of a steering wheel turn with a piece of wood or similar item.
Run engine warm.
Pull steering wheel against final left lock about five seconds with a force of 100 N or 22 lbs. (check with force meter).
Read pressure on pressure tester 32 4 000.
Limit final right lock and repeat same test on right lock.
If pressure values are less than the previously measured pump pressure, replace steering gear.
3. Mechanical play in Steering:
Hold steering drop arm in straight ahead position with Special Tool 32 4 030. (marks on housing steering shaft).
Past strips of paper on steering wheel hub and casing upper section.
Mark center on steering wheel hub.
Open valve (B).
Close valve (A).
Run engine at idle speed.
Open valve (A).
Read flow pressure.
Turn steering wheel anticlockwise until pressure tester shows 1 bar (14 psi.) more pressure than the measured flow pressure value.
Mark position on steering wheel hub.
Repeat procedures on right lock.
If a maximum permissible travel (C) = 7 mm (0.276) is exceeded, check joint disc.
If joint disc is okay, replace steering gear.
Remove pressure tester 32 4 000 and bleed hydraulic system.