Front Steering Knuckle: Service and Repair

31 21 090 Removing and installing/replacing left or right swivel bearing







Remove front wheel.

IMPORTANT: Expand turning lock sufficiently to avoid damaging thread when releasing collar nut.

Release collar nut (1), press brake pedal to floor for this purpose.
Tightening torque 31 60 2AZ.

Installation:
Replace collar nut, oil collar nut/wheel bearing contact surface only and tighten down.
No oil permitted on thread of shaft journal or collar nut.
Secure collar nut on flattened area (2) of drive shaft by positive peening.







Remove brake disc.
Remove pulse generator from swivel bearing and expose line up to engine carrier







IMPORTANT: To avoid damaging the stabilizer link, remove the stabilizer link from the stabilizer.

Remove tie rod end from swivel bearing.
Remove wheel guide joint from swivel bearing.
Press swivel bearing (1) outwards and remove output shaft (2) from wheel bearing.







Disengage brake hose from holder.







IMPORTANT: Tightening to torque must be effected by means of the screw.

Support swivel bearing with workshop jack.
Slacken nut (2).
Tightening torque 31 31 3AZ.
Pull out screw (1) towards rear and remove swivel bearing.

Installation:
Keep swivel bearing to spring strut connection clean and free from oil and grease.
Note insertion direction of screw.
Replace self-locking nuts.







Replacement:
- Modify wheel bearing
- Modify brake carrier/guard plate







After installation:
- Replacement only: Perform chassis alignment check