Replacing Power Steering Filter
,
Take off cover (1).
Remove circlip (2), spring (3), filter cover (4)
and filter (5).
Installation: Install filter in lock provided for
this purpose.
Check seal, replacing if necessary.
Check oil level.

SERVICE JOBS ON FRONT AXLE
Checking/Adjusting Front Wheel Bearing Play
Remove and install grease cap with Special Tool 31 2 000.
Remove cotter pin and unscrew castle nut.
If necessary, replace grease packing.

Tighten castle nut to 30 - 33 Nm (22 - 24 ft. lbs.)
while turning wheel hub continuously.
This will settle tapered pins and bearing inner races.
Grease causing play will also be forced out.
Turn tightened bearing assemblyat least 2 more turns.
In so doing, do not loosen or tighten castle nut any further.

Loosen castle nut until there is axial bearing play, the
hub being turned again.
Tighten castle nut by max. 3 Nm (2 ft. lbs.), then turn back
to nearest hole and lock with cotter pin.
Checking Axial Bearing Play:
Tabbed disc (1) must move without noticeable resistance.

Tightening Bolts and Nuts
Support bearing to wheel house......Nm 22-24, Ft. Lbs. 16-17
Front axle carrier to engine carrier......Nm 43-48, Ft. Lbs. 31-35
Control arm to front axle carrier.....Nm 81-90, Ft. Lbs. 59-65
Stabilizer to control arm.....Nm 70-90, Ft. Lbs. 51-65
Bracket for stabilizer.....Nm 47-52, Ft. Lbs. 34-38

Checking Power Steering Pump and Funcition of Power Steering
A) Pump
Always check delivery pressure of pump first.
Detach pressure line (1) at pump.
In its place, connect pressure line (2) from pressure tester 32 4 000.
Important: Never reuse drained oil.

Connect pressure line (1), detached from pump, on pressure tester.

Shut valve (1). Open valve (2) and bleed hydraulic system
with engine running at idle speed 32 13 006. Engine must have operating
temperature. After bleeding, shut valve (2) for max. 10 seconds and
take pressure reading. Pressure could be less than pressure of
110 bar (1600 psi) as on pump´s data plate by max. 10%.
Pressure Inadequate:
a) Check belt tightness. b) Replace pump.
Important: Valve (1) must be shut for high pressure tests,
because otherwise pressure gage (max. 16 bar/230 psi) would be destroyed.


32 13 006

B) Power Stearing
Lift car.
Limit steering lock by 1/2 to 3/4 steering wheel turn
before reaching final stop (wood or similar item).

Let engine run.
Pull steering wheel against final stop with a force of 100 N (22 lbs.)
for approx. 5 seconds.
Read pressure from pressure gage 32 4 000.
Make same measurement at right lock.
If determined pressure values are less than max. pump
pressure¹), replace steering gear.


¹) See Specifications of Group 32

C) Checking Mechanical Steering Play (pressure point adjusted)
Hold steering drop arm in straight ahead position with
Special Tool 32 4 040.

Open valve (2).
Shut valve (1).
Run engine having operating temperature at idle speed.
Open valve (1).
Read flow-through pressure.

Paste strips of paper on steering wheel hub and casing upper section.
Turn steering wheel anticlockwise carefully until pressure gage shows
1 bar (14 psi) more than the flow-through pressure.
Mark position of steering wheel hub at (A).
Turn steering wheel clockwise carefully until pressure gage 32 4 000
shows 1 bar (14 psi) more than flow-through pressure.
Again mark position of steering wheel hub on (A).

Total travel (B) mut not exceed 7 mm (0.275´´).
Check joint coupling, if 7 mm (0.275´´) are exceeded.
Replace steering gear, if joint coupling is not cause.
Remove pressure gage 32 4 000.
Fill and bleed hydraulic system 32 13 006.


32 13 006

Tightening Bolts and Nuts of Steering
Power steering pump to engine......Nm 22-24, Ft. Lbs. 16-17
Steering gear to front axle carrier.....Nm 43-48, Ft. Lbs. 31-35
Joint coupling to joint flange.....Nm 20-23, Ft. Lbs. 15-17
Joint flange to steering gear and steering spindle.....Nm 25-28, Ft. Lbs. 18-20
Tie rod bolts......Nm 12-15, Ft. Lbs. 9-11
Tie rod castle nuts......Nm 35-40, Ft. Lbs. 25-29
Tie rod arm to steering knuckle.....Nm 45-60, Ft. Lbs. 33-43