42581900 Removing and Installing Rear Wheel Bearing

WM 425819 Removing and installing rear wheel bearing

Tools






Preliminary work

CAUTION

Increased danger of accident when handling hydraulic presses.

- Danger of crushing and material damage if the wheel carrier is raised improperly.
- Watch out for parts falling when working with the hydraulic cylinder.

-> Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).
-> When raising the suspension, use a suitable intermediate layer (hard rubber).
-> Do not damage the brake cover plate.
-> Vehicle may not be moved if drive shafts have not been fitted and tightened.

The wheel bearing is removed with the wheel bearing housing installed.
1. Remove the corresponding hub cap with puller hook 92291 and release the axle nut (lock nut) before lifting the vehicle. Operate the brake whilst doing so (second fitter required).
2. Raise the vehicle-> 40 Raising the vehicle and remove the relevant rear wheel -> 440519 Removing and installing wheel - section on "Removing" Removal and Replacement.
3. Remove axle nut (lock nut) and the drive shaft -> 422119 Removing and installing drive shaft - section on "Removing" 422119 Removing and installing rear drive shaft. To remove and install the drive shaft, the rear final drive must be removed -> 390119 Removing and installing rear final drive - section on ""Removing" 390119 Removing and installing rear final drive.

Tools and materials

Tools

Tool overview for wheel bearing





Tool overview for wheel bearing






Removing

Removing rear wheel bearing

Component overview of wheel bearing





Component overview of wheel bearing





1. Release brake caliper and hang at a suitable place in the wheel housing.
2. Remove brake disc -> 465319 Removing and installing rear brake disc - section on "Removing" 46531950 Removing and installing rear brake disc.





3. Disengage the cable of the foot-operated parking brake and remove the brake shoes.
4. Remove wheel speed sensor -see illustration-. -> 451119 Removing and installing front speed sensor - section on "Removing" Service and Repair.





5. Remove wheel hub (tools).





6. Secure the grip pieces (two half shells) (from attachments T10205 ) with several wheel bolts behind the wheel hub.





7. Insert the T10205/2 bell (from attachments T10205 ) at the correct position in the groove provided.





8. Insert the tubular piston cylinder VAS 6178. Position the T10205/3 pressure piece (from attachments T10205 ) and the T10205/8-2 threaded nut (from attachments T10205 ). Press out the wheel hub.





Ensure that the separating device does not press on the seat of the bearing inner race on the wheel hub.





9. If the wheel hub is used again, remove the => see figure inner race of the wheel bearing from the wheel hub. To do this, position the separating device 12 - 115 mm dia. NR.111 behind the inner race.
10. Press inner race off the wheel hub. To do this, position the T10205/2 bell (from attachments T10205 ) without the grip piece. Insert the tubular piston cylinder VAS 6178. Position the T10205/3 pressure piece (from attachments T10205 ) and the T10205/8-2 threaded nut (from attachments T10205 ).





11. Remove the circlip -arrow-.





12. Remove the wheel bearing (tools).





13. Press out the wheel bearing. To do this, position the T10205/4 mounting (from attachments T10205 ) and the T10205/5 pipe (from attachments T10205 ) in the correct position on wheel bearing housing. Insert the tubular piston cylinder VAS 6178. Position the T10205/6 pressure disc (from attachments T10205 ) and the T10205/8-2 threaded nut (from attachments T10205 ).






Installing

Installing rear wheel bearing

Information

- The wheel bearing must not come into contact with magnetic objects (e.g., magnetic screwdriver, magnet).

- The entire threaded parts of the axle must be tightened in vehicle position. Vehicle position means: vehicle standing on the wheels, or the wheel suspension is raised using a universal vehicle lift. Dimension -X- , from lower edge of wing to middle of axle 506 mm +/- 10 mm corresponds to vehicle position.





- Use an intermediate layer (hard rubber) . Do not damage the brake cover plate.





- Screws and nuts are Dacromet-coated and must not be greased.

- Grease axle nut with a little Optimoly TA aluminium paste only at mounting-face ring.

- Grease the toothing of the drive shaft slightly with aluminium paste Optimoly TA.

- Drive shafts must not be left hanging from the joint stop. Tie up.

- Use new screws and lock nuts.

- The wheel bearing seat must be free of grease.

- Observe correct tightening torques. -> 42 Tightening torques for rear axle

1. Fit the wheel bearing (tools).





Check that the bearing seat -arrow- is clean and the surface is in good order. There must be no scores, grooves or deformations.





Insert the wheel bearing with the magnetic multiple-pole ring to the drive shaft. Check the magnetic side (e.g., with a paper clip). Do not use magnets or screw drivers to check.





2. Position the => see figure wheel bearing in the wheel bearing housing in the correct position. Position the T10205/7 pressure piece (from attachments T10205 ) in the correct position on the wheel bearing. Insert the tubular piston cylinder VAS 6178. Position the T10205/9 pressure piece (from attachments T10205 ) and the T10205/8-2 threaded nut (from attachments T10205 ) in the correct position. Mount the wheel bearing. Shortly before the stop, the applied force will be between 35 and 60 kN. The maximum assembling force must not exceed 90 kN at the stop.
3. Position the => see figure circlip with the opening facing downward. When the Seger ring is fitted correctly, the dimension -X- is at least 15 mm. If this dimension is not reached, the Seger ring must be fitted again. If necessary, carefully press the wheel bearing again.





4. Fit the wheel hub (tools).





Carry out a close visual inspection of the seat of the wheel hub. There must not be scores, grooves or similar deformations on the hub.
5. Position the => see figure wheel hub in the correct position. Position the T10205/10 pressure piece (from attachments T10205 ) in the correct position on the wheel hub. Insert the tubular piston cylinder VAS 6178. Position the T10205/6 pressure disc (from attachments T10205 ) and the T10205/8-2 threaded nut (from attachments T10205 ) in the correct position. Pull in the wheel hub. Shortly before the stop, the applied force will be between 9 and 35 kN. The maximum assembling force must not exceed 40 kN at the stop.





6. => see figure Fit wheel speed sensor -> 451119 Removing and installing front speed sensor - section on "Installing" Service and Repair.






Subsequent work

1. Fit the drive shaft, brake shoes, brake disc, and brake caliper in reverse order. Engage the cable of the foot-operated parking brake and adjust the brake shoes -> 468316 Adjusting foot-operated parking brake - section on "Adjusting" Adjustments.
2. Fit wheel -> 440519 Removing and installing wheels - section on "Installing" Removal and Replacement.