Vehicles before change point in 1982
DISASSEMBLING(ASSEMBLING POWER STEERING GEAR
Important: Power steering gears may only be
repaired in exceptional cases. Normally the
steering gear would be replaced.
Remove and install power steering gear
32 13 060.
Steering Drop Arm:
Open lockplate.
Unscrew nut.
Pull off steering drop arm with Special Tool
32 2 000.
Installation: Tightening torque¹).


32 13 060
¹) See Specifications

Check steering drop arm.
Distance A = 112.5 ± 0.5 mm (4.429 ± 0.020´´´)
Distance B = 26 mm (1.024´´)

Installation: Marks on steering drop arm and
sector shaft must align with each other.

Pressure Point Cover:
Mark position of cover to box with punch (K).
Unscrew nut (1), holding bolt (2).
Unscrew cover mounting bolts.
Installation: Tightening torque¹).


¹) See Specifications

Lift cover by turning adjusting screw clockwise.
Installation: Check O-ring (3) in cover, replacing
if necessary.
Position cover correctly before tightening the
cover´s adjusting screw.

Installation: Find middle position of worm shaft
by taking half of the total number of turns.
Turn worm shaft anticlockwise by 1 turn.
After installation of Special Tools 32 1 000 and
00 2 000 turn shaft clockwise past pressure point
and read friction torque value¹).
To adjust, turn worm shaft anticlockwise by 1 turn.
Turn adjusting screw (1) clockwise until specified
friction torque value¹) is reached when passing
pressure point.


¹) See Specifications

Sector Shaft:
Pull out sector shaft in middle position.
Installation: Fill spline with hot bearing grease
Slide in sector shaft carefully to prevent damage
to radial oil seals.

Check axial play¹) of adjusting screw and correct
with a thicker washer (1) if necessary.
Adjusting screw must turn easily without restriction.


¹) See Specifications

Remove circlip (1) and radial oil seal (2).
Pull off needle bearing (3).
Knock out needle bearing (4) with support disc
(5) and oil seal (6).
Installation: Sealing lips of oil seals (2 and 6)
face inside of housing.

Valve Housing:
Pull off cap (1) and detach valve housing.
Installation: Tightening torque¹).
Wrap cellophane tape around spline to avoid
damage to radial oil seal.


¹) See Specifications

Remove ball bearings.
Installation: Check oil seals (1 ... 4), replacing
if necessary.

Only applicable when replacing needle bearings:
Press off bearing race (1).
Scrape off double needle cage (2).
Installation: Position bearing race (1) and needle
cage (2) to each other without play. For this purpose
the needle cage (2) is available in four different
sizes.

Intermediate Cover:
Pull worm with intermediate cover and piston
out of housing.
Installation: Check oil seals (1 ... 4), replacing if
necessary.

Turn worm out of piston.
Important: Balls!
Remove intermediate cover.
Take off circlip (1) and remove ball recirculating
tube (2).

Check needle cage (1), bearing disc (2), grooved
ring (3), O-ring (4) and teflon ring (5).
Installation: Shims 0 ... 4 (6) are optional.
Select number of shims to give a preload to sealing
lip of grooved ring (3).
Don´t exceed max. specified friction torque
value¹).


¹) See Specifications

Installation: Mount valve housing without radial
oil seal, worm head without teflon seals, intermediate
cover without O-ring and grooved ring with
ball bearing, needle cage (1) and support disc (2)
to valve housing.

Mount valve housing with intermediate cover
to steering gear.
Tighten bolts uniformly to specified torque¹).
Adjust friction torque¹) for worm bearings
with support disc (2).
Support disc (2) is available in different sizes in
steps of 1/100 mm.


¹) See Specifications

Check preload of teflon ring in intermediate
cover.
Place support disc and needle cage in intermediate
cover.
Install O-ring (1) and teflon ring (2) in groove.
A = 1.7 mm (0.067´´).

Install worm shaft in intermediate cover.
Mount Special Tool 32 1 000 and measure specified
friction torque¹) in vertical position with
Special Tool 00 2 000.
Install a thicker teflon ring, if friction torque
value is insufficient.
Important: Don´t clamp intermediate cover.


¹) See Specifications

Teflon Rings, Worm Head, Pistons:
Lift teflon rings (1 ... 4) out of worm head and
piston with a feeler gage blade.
Remove O-ring (5).
Installation: Replace removed rings.

Checking and Adjusting Worm Head´s Total
Friction Torque:
Teflon rings installed in worm head and radial
seal in valve housing.
Teflon ring (5) installed in intermediate cover
and friction torque measured.
Install O-ring (4) and grooved ring (3), sealing lip
facing piston end, with the previously removed
shims (6).
Install worm head in valve housing.
Mount intermediate cover with valve housing on
steering gear and measure friction torque.
Use shims (6) to adjust preload of grooved ring
(3) 10 Ncm (1 in.lbs.) higher than the previously
measured friction torque value in the intermediate
cover.
Installation: Tightening torque¹).


¹) See Specifications

Piston and Worm:
Important: Don´t remove valve piston (1).
If removed, hydraulic center point adjusted
exactly over steering spindle and torsion bar
would no longer be correct.
Check adjustment of steering limit valve.
A = 107 _ 0.20 mm (4.212 _ 0.008´´).

Steering Limit Valve (15)

Steering limit valve must open shortly before
reaching steering lock.
Adjust stop screw (2) that steering limit valve
will open 2 mm (0.080´´) in front of tie rod
arm stop.

Guide worm into piston.
A = approx. 6 cm (2.362´´).
Insert 16 balls through front bore.
Turn worm toward inside while inserting balls.

Place 7 balls in recirculating tube.
Hold both outer balls in position with grease.

Secure ball recirculating tube with circlip.

Unscrew worm by about 3 1/2 turns.
Check friction torque¹) horizontally over a range
of at least 90° with Special Tools 00 2 000 and
32 1 000.
Friction torque is given by ball diameter.
Important: Only use balls of same diameter, i.e.
same tolerance group.
Remove worm after adjusting friction torque.
Install intermediate cover and assemble worm
with piston.
Important: Never unscrew worm by more than
3 1/2 turns to prevent balls from falling into
piston bore.


¹) See Specifications