Rear axle wheel hubs - regreasing, checking tapered roller bearings

AP35.20-B-3550D

Rear axle wheel hubs - regreasing, checking tapered roller bearings

24.08.2020

Rear axle

749.9 in model 382.1

with code BB5 (Disc brakes on front and rear axle)

Rear axle

749.9 in model 634.0

with code BB5 (Disc brakes on front and rear axle)

Rear axle

749.9 in model 958

with code BB5 (Disc brakes on front and rear axle)

Modification notes

12.06.2019

Grease

BF35.50-B-1001-01A

22.05.2020

Nuts with integrated washer - centering in the wheel hub

BA40.10-B-1001-03A

11.08.2020

Grease

BF35.50-B-1001-01A

1

Inner taper roller bearing

2

Inner bearing outside race

3

Wheel hub

4

Outer bearing outside race



Remove

1

Apply the parking brake and release lightly the wheel clamping nuts

2

Lift the vehicle and support it on safety stands placed under the rear axle beam

3

Remove the rear wheels

4

Disassemble the wheel hub (3)



.

AR35.20-B-0320F



Check

5

Check the wear on the friction surface of the radial seal bearing race



.

AR35.20-B-0310-05A

 The track ring must be replaced by a new one every time that the friction surface presents damages, wearing or grooves.

6

Remove the grease from the wheel hub (3) and wash all components

 Check all parts for wear and/or damages, particularly the inner tapered roller bearings (1) and their seats.

 Replace the inner tapered roller bearings (1) damaged.



Install

7

Lubricate well the radial seal and the inner tapered roller bearings (1)

 Install a new radial seal.

8

Supply the wheel hub (3) with grease

 Rear axles 749.9Grease

*BF35.50-B-1001-01A

9

Install the wheel hub



.

AR35.20-B-0320F

10

Install the rear wheels

11

Lower vehicle from rack and tighten wheels security nuts

 .Nuts with integrated washer - centering in the wheel hub

*BA40.10-B-1001-03A

 .Nuts with ball washer - centering with washer

*BA40.10-B-1002-03A

12

Re-tighten the wheel fastening nuts

 This operation will have to be carried out after having driven the first 50 to 100 km.

 Disc wheels

Number

Designation

Type 382, 384, 634

For vehicles 693, 694, 695, 934, 936, 938, 958

BA40.10-B-1001-03A

Nuts with integrated washer - centering in the wheel hub

M18x1.5

Nm

-

-

M22x1.5

Nm

600

600

 Disc wheels

Number

Designation

Type 382, 384, 634

For vehicles 693, 694, 695, 934, 936, 938, 958

BA40.10-B-1002-03A

Nuts with ball washer - centering with washer

M18x1.5

Nm

-

-

M22x1.5

Nm

450

-

 Towed shaft, second driven shaft

Number

Designation

Auxiliary rear axle 749.90/91/920/921/923/93

BF35.50-B-1001-01A

Grease

Replenishment quantity

Inner tapered roller bearing

g

120

Outer tapered roller bearing

g

140

Hub cap

g

-

Class

Specification (except Brazil)

MB 267.1

Specification (Brazil)

Consultar documento AH00.40-B-0001-01MBF no site Mercedes-Benz / Guia de Lubrificantes