Vehicles after change point in 1982
CHECKING OPERATION OF
POWER STEERING
(H-31 SYSTEM)
- 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 0 to 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 bar)
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.


** See Service Information of Gr. 00

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):