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. 
  Fig 1: Identifying Vehicle Position Mark

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• Use an intermediate layer (hard rubber)! Do not damage the brake cover plate. 
  Fig 2: Identifying Brake Cover Plate

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• 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  . → WM 4200TW TIGHTENING TORQUES FOR REAR AXLE 

1. Fit the wheel bearing (tools).
   Fig 3: Identifying Wheel Bearing (Tools)

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   Check that the bearing seat -arrow-  is clean and the surface is in good order. There must not be scores, grooves or deformations.

   Fig 4: Locating Bearing Seat

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   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!

   Fig 5: Inserting Wheel Bearing With Magnetic Multiple-Pole Ring To Drive Shaft

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2. Position the → see Fig 6 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 wheel bearing. Shortly before the stop, the applied force will be between 35 KN and 60 KN. The maximum assembling force must not exceed 67 ft lbs. at the stop.
3. Position the → see Fig 6 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, refit the Seeger circlip ring. If necessary, carefully press again on the wheel bearing.
   Fig 6: Fitting Seeger Circlip Ring

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4. Fit the wheel hub (tools).
   Fig 7: Identifying Wheel Hub (Tools)

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   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 Fig 8 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 KN and 35 KN. The maximum assembling force must not exceed 30 ft lbs. at the stop.
   Fig 8: Inserting Tubular Piston Cylinder VAS 6178

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6. see → Installing Speed Sensor .
   Fig 9: Identifying Front Speed Sensor

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