Wheel Bearing: Service and Repair

Removal and Installation






1. Unscrew, screw in hexagon bolt for attaching rear axle shaft to rear axle shaft flange and remove together with spacing sleeve and tensioning washer.






Note
Tightening torque 30 Nm (79).
Torque wrench 001 589 66 21 00.

Renew tensioning washer (79a) after one-time use. Oil tensioning washer (79a) in area of bolt head.






2. Remove rear axle shaft.






3. If required, push out, push in rear axle shaft(28) at rear axle shaft flange (78) by means of assembly tool 201 589 00 61 00 (05a - 05c).

4. Remove caliper and brake disc.






5. Attach caliper to torsion bar with binding wire.






6. Detach, mount assembly plate 136 589 05 31 00 (078).






7. Unlock, or tighten up slot nut with socket for slot nut 115 589 02 07 00 (070).






Note: An extension (arrow, self-made) can also be used for any support of the assembly plate (078). It is not necessary to unlock the slot nut, since this can be stripped by excessive force.

Clamp assembly plate (078) on the shaft in the vise in order to slacken the slot nut when the semi-trailing arm is removed.






Note: Renew slot nut. Carefully tighten up slot nut with socket for slot nut 115 589 02 07 00 (070) until there is still a detectable end play present, whilst supporting assembly plate (078). Attach dial gauge holder with dial gauge to brake cover plate. Torque wrench 001 589 74 21 00.






Check end play of rear axle shaft flange whilst moving rear axle shaft flange in and out and simultaneously rotating to the left and right.
End play 0.03-0.06 mm.
Dial gauge holder 363 589 02 21 00, dial gauge.

If there is no longer any end play present due to over-tightening the slot nut, do not correct this by loosening the slot nut, but always install a new spacing sleeve and adjust end play again.






Secure slot nut (070) by bending over at two points in the matching grooves (arrows) in the rear axle shaft flange (78).






8. Drive rear axle shaft flange out of the wheel carrier with impact puller 201 589 10 33 00 and remove.






9. Remove or put on sealing ring.

Note: Always renew sealing ring.

10. Press inner radial sealing ring (71) out of the wheel carrier with a screwdriver and remove together with taper roller bearing inner ring (73).

Note: Coat new radial sealing ring (71) between the two sealing lips with multi-purpose grease. Mount radial sealing ring with partially rubberized jacket in dry condition.
Coat or fill both taper roller bearing inner rings and cavity between the two bearing outer rings in the wheel carrier with approx. 50 g of multi- purpose grease.






Press off or press on bearing inner ring (73) and radial sealing ring (71) together with the assembly tool 201 589 00 61 00 (05a-05f).






11. Press off outer radial sealing ring (77) from wheel carrier with a screwdriver.







Note: Coat seat for the outer radial sealing ring on the wheel carrier (75) with sealing compound and carefully pull on new radial sealing ring (77) with installer 116 589 11 61 00, so that it contacts chamfer on the wheel carrier (arrow).






12. Pull bearing outer ring (76a) of outer taper roller bearing out of the wheel carrier with puller 115 89 00 33 00(076).






13. Drive bearing outer ring of inner taper roller bearing out of wheel carrier (75) with punch 115 589 02 43 00 (073).






Note: Pull both bearing outer rings (73a, 76a) into the wheel carrier (75) simultaneously with installer 116 589 11 61 00 (073a, 076a).






14. Remove or put on spacing sleeve (arrow).

Note: Generally renew spacing sleeve after it has been used once.
Width of spacing sleeve 11.8 - 12.0 mm.






15. Clamp assembly plate 136 589 05 31 00 (078) with rear axle shaft flange (78) in vise.

16. Put on or remove thrust pad 000 589 03 34 00 (078a) for supporting the puller.






17. Pull taper roller bearing inner ring off rear axle shaft flange with puller 001 589 36 33 00 and collet 00 589 02 34 00.






Note: Press taper roller bearing inner ring (76) onto rear axle shaft flange (78) with a suitable tube.






Only use taper roller bearing with a large filet radius on the rear axle shaft flange (arrow).






If required, refinish oil return spiral with emery cloth (grain 180) at an angle of approx. 20~ over a length of 25 mm.






The rear axle shaft flanges are provided with an oil return spiral on running surface for outer radial sealing ring, which differs on lefthand and righthand side. For identification, the chamfer for concentric alignment is provided with a punched in "R" for righthand side (arrow) and a punched in "L" for lefthand side.

18. Check all individual parts for re-use. To do this pay particular attention to the running surfaces for the radial sealing rings on the rear axle shaft flange and on the sealing ring. Renew worn parts. Check vertical and lateral runout of the rear axle shaft flange.

19. Installation takes place in the reverse sequence.