31 21 180 Replacing bearing for front wheel

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Special tools required:

See 22 ENGINE AND GEARBOX SUSPENSION , 31 FRONT AXLE , REAR AXLE - SPECIAL TOOLS .

22 1 018
31 2 113
33 1 367
33 2 116
33 2 160
33 2 201
33 3 261
33 3 266
33 3 268
33 4 036
33 4 200
33 4 261

IMPORTANT: Bearing cannot be dismantled.
Do not wash out bearing.

Remove front wheels, see 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

Release collar nut; to do so, press brake pedal to floor.

Remove brake disc, see 34 11 220 REMOVING AND INSTALLING/REPLACING BOTH FRONT BRAKE DISCS .

Fig 1: Locating Collar Nut

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Force drive flange with special tools 33 2 116 / 33 2 201 , 33 2 160 , 33 4 200 and 5 wheel studs out of wheel bearing.

NOTE: Rounded inside edge of special tool 33 2 160 must point to drive flange.

Detach wheel bearing inner race from drive flange.

Fig 2: Special Tool (33 2 160) And (33 4 200)

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Remove swivel bearing, see 31 21 090 Replacing (removing and installing) left or right swivel bearing and clamp with aluminium clamping jaws in vice.

IMPORTANT: The bearing is destroyed when the drive flange is removed and must not be reused!

Lift out retaining ring (1).

Fig 3: Removing Retaining Ring

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Pull out bearing with special tools 31 2 113 , 33 4 261 , 33 4 036 and 33 3 261.

NOTE: The bearing can be forced out of the swivel bearing on a press.

Check dust sleeve, replace if necessary.

Fig 4: Pulling Out Bearing With Special Tools

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IMPORTANT: Keep press-fit areas clean and free of oil and grease.
Wider chamfer of bearing must point to swivel bearing!

Clean press-fit area of new bearing.

Clean bearing seat in swivel bearing.

IMPORTANT: Wider chamfer (1) of bearing must point to swivel bearing!

Fig 5: Bearing Wider Chamfer

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Align bearing by way of wider chamfer to swivel bearing and draw in with special tools 31 2 113 , 22 1 018 , 33 1 367 and 33 3 261.

NOTE: The bearing can be forced out of the swivel bearing on a press.

Fig 6: Special Tools (33 3 261), (33 1 367) And (31 2 113)

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Install new circlip (1).

NOTE: Make sure circlip (1) is correctly seated.

Fig 7: Removing Retaining Ring

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Draw in drive flange (1) with special tools 31 2 113 , 33 3 268 , 33 3 266 and 33 3 261.

Fig 8: Drive Flange With Special Tools (33 3 261), (33 3 266) And (31 2 113)

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Install swivel bearing, see 31 21 090 Replacing (removing and installing) left or right swivel bearing .

Draw output shaft into drive flange, see 31 60 ... Pressing output shaft out of drive flange (wheel hub) and drawing in .

Remove brake disc, see 34 11 220 REMOVING AND INSTALLING/REPLACING BOTH FRONT BRAKE DISCS .

Install front brake calliper, see 34 11 519 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT FRONT BRAKE CALIPER .

Replace collar nut, apply a light coating of oil to contact surface and tighten down.

Tightening torque: 31 21 2AZ, see 31 21 WHEEL BEARINGS AND STEERING KNUCKLE .

Secure collar nut by peening on flat areas of output shaft.

Remove front wheels, see 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

Fig 9: Locating Collar Nut

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