31 21 180 Replacing bearing for front wheel

Necessary preliminary tasks:

If necessary, remove visual protection cap (1).

Fig 1: Removing Visual Protection Cap

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Release collar bolt (1), press brake pedal to floor for this purpose.

Tightening torque 31 60 2AZ .

Fig 2: Identifying Collar Bolt

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Installation note:

Renew collar bolt (1) and compression spring (2).
Pay attention to installation position of compression spring (2).
Keep collar bolt and spur toothing of bearing/propeller shaft clean and free of grease
Follow installation note of the spur gearing.

Fig 3: Identifying Compression Spring And Collar Bolt
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NOTE:

Press output shaft on swivel bearing to one side slightly and release screws (1).

Tightening torque 31 21 1AZ .

Remove bearing.

Fig 4: Identifying Screws Of Output Shaft On Swivel Bearing

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Installation note:

Replace screws.
Keep contact surface (2) of wheel bearing and swivel bearing clean and free from grease.

Fig 5: Identifying Contact Surface Of Wheel And Swivel Bearing
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IMPORTANT: Note on installation for spur gearing must be observed without fail!

Installation note:

Spur gearing of bearing (1) and output shaft (2) must be installed form-fit (tooth in tooth)!
Tighten collar bolt and compression spring by hand.
Check whether spur gearing is locked tooth in tooth by reciprocally rotating wheel hub/output shaft.
Once a form-fit has been ensured, tighten to final torque.
Tightening torque 31 60 2AZ .

Fig 6: Checking Spur Gearing Of Bearing
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