Remove Rear Axle Hub Reduction Gear Bearing - AR35.25-P-0655-01GWX

Model 463.234 

up to model year 2019 with code ZQ0 (G 500 4x4 ²  ) 

Model 463.255 

up to model year 2019 

with code MUK2 (USA or Canada vehicle model designation) 

with code ZQ0 (G 500 4x4 ²  ) 

Model 463.274 

up to model year 2019 

with code LQ0 (G650 Landaulet) 

	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
	Risk of injury  . Moving parts can pinch, crush or, in extreme cases even sever extremities.	No parts of the body or limbs should be within the operating area of mechanical components when moving components.	AS00.00-Z-0009-01A
	Notes for repair work on hub reduction gear		AH33.25-P-0650-01GWX
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Notes on repair work on suspension components		AH00.00-P-0100-01A

Courtesy of MERCEDES-BENZ USA

Separating housing halves 

1. Prepare assembly tool.

   When carrying out the work, it is repeatedly necessary to secure or release the assembly tool against twisting and to align it vertically or horizontally.

2. Fix the hub reduction gear in place in the assembly tool and secure against twisting.

   Aid of helper required.

3. Remove screws (19) of outer housing (13).

   The screw (19) directly over the wheel hub (36) is not yet removable at this point in time.

4. Remove screws (18) of inner housing (12).
5. Remove screw/bolts (16).

   Remove washers (15) with screws (16).

6. Remove cap (14).
7. Unscrew screw/bolt (6).
8. Enable twisting on the assembly tool.
9. Turn the housing so that the opening of the screw (6) and the screw of clamp nut (27) are aligned.
10. Loosen screw of clamp nut (27) and unscrew clamp nut (27) with the adapter.
11. Remove thrust plate (26) and tapered roller bearing (28).

    The bearing shell of the tapered roller bearing (28) remains in the inner housing (12).

12. Disconnect the inner housing (12) from the outer housing (13) with the grub screws and put down the inner housing (12) on a suitable base.

    Aid of helper required.

13. Take the deflecting spur gear (24) with tapered roller bearings (23, 25) out of the outer housing (13) and put

    Do not use a prying tool.

    This leads to damage to the sealing surfaces or to the cap (14).

    The bearing shell of the tapered roller bearing (23) remains in the outer housing (13).

    The bearing shell of the tapered roller bearing (25) remains in the inner housing (12).

    Observe alignment of the deflecting spur gear (24).

    Removing the wheel hub (36) 

14. Secure assembly tool against twisting.
15. Remove retaining ring (29).
16. Remove gearwheel (33) of wheel hub (36).

    The gearwheel (33) is inserted on the shaft of wheel hub (36).

17. Remove outer housing (13) and put down on a suitable base.

    Remove screw (19) directly over wheel hub (36).

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    Disassembling the wheel hub (36) 

    The bearing shell (31 a) from the tapered roller bearing (31) remains on the outer housing.

18. Remove thrust plate (2) from wheel hub (36).
19. Remove tapered roller bearing (31) with the puller.
20. Remove thrust plate (30) of tapered roller bearing (31) from wheel hub (36).

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    Removing the drive shaft 

21. Secure gearwheel (34) of drive shaft against twisting with the blocking device.
22. Remove screw (8) and remove drive shaft.

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    Disassembling the outer housing (13) 

23. Remove bearing shell (23a) with the internal extractor and the counter stay and fasten to associated bearing cage.

    Do not support counter stay directly on the outer housing (13).

    This will result in damage to the housing or the sealing surfaces.

24. Remove cylindrical roller bearing (22) with the internal extractor and counter stay.

    Do not support counter stay directly on the outer housing (13).

    This will result in damage to the housing or the sealing surfaces.

    The caulking points (9), which are to be reapplied, for securing the cylindrical roller bearing (22) must be 120° away from each other during installation. The distance from the existing caulking points (9) must be at least 30°.

    If the described minimum distance of the caulking points (9) is less than 30°.

    ↓

    Replace the outer housing (13).

25. Remove shaft seal (32) with a suitable tool.

    Replace shaft seal (32).

26. Remove bearing shell of tapered roller bearing (31) using suitable means.

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    Disassembling the inner housing (12) 

27. ²⁷ Remove bearing shell (25a) with the internal extractor and the counter stay and fasten to associated tapered roller bearing.

    Do not support counter stay directly on the inner housing (12).

    This will result in damage to the housing or the sealing surfaces.

28. Remove shims (1) from seat of bearing shell (25a).
29. ²⁹ Remove bearing shell (28a) with drift.

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    Courtesy of MERCEDES-BENZ USA

30. Remove circlip (4).
31. Remove gearwheel (34) with drift.
32. Remove shaft seal (21) with a suitable tool.

    Replace shaft seal (21).

33. Remove circlip (3).
34. Remove cylindrical roller bearing (20) with drift.
35. Remove pulse ring (11) from gearwheel (34) using a suitable tool.

    Disassembling the deflecting spur gear (24) 

    Do not support the puller directly on the spur gear (24).

    This damages the spur gear (24).

36. Remove bearing shells of both tapered roller bearings (23, 25) and place to one side.

    Do not mix up bearing shells and tapered roller bearings (23, 25).

37. Remove tapered roller bearing (23) with the puller from the spur gear (24) and allocate to the associated bearing shell.
38. Remove tapered roller bearing (25) with the puller from the spur gear (24) and allocate to the associated bearing shell.

    Courtesy of MERCEDES-BENZ USA