Pinion Seal

PINION SEAL

REMOVAL
1. Remove wheels.
2. Push back brake pads and release hand brake.

NOTE: If it is not possible to spin rear axle shafts manually, detach rear brake cables.

3. Drain rear axle oil.
4. Remove propeller shaft.
5. Spin pinion flange by hand and check axial play of bearing.

CAUTION: There must not be any thrust bearing play. If play excess or there are particles (shavings) in the drained oil, replace gear assembly.





6. Mark installation position of collared nut (Fig. 26) with respect to drive pinion.
7. Unlock collared nut.
8. Hold pinion flange with Flange Wrench C 3281 and remove nut.





9. Remove pinion flange from pinion shaft with Flange Puller 8992 (Fig. 27).
10. Check sealing surfaces of joint flange for score marks and replace joint flange if necessary.





11. Remove both pinion radial seals (Fig. 28).

INSTALLATION
1. Pack space between dust lip and sealing lip on radial seal ring with multi purpose grease.
2. On radial seal rings without rubberized external surface, coat outer circumference with sealant.

CAUTION: Do not coat partially rubberized seals with sealant.





3. Drive new pinion radial seals into rear axle housing as far as the stop using Installer 9276 (Fig. 29).
4. Fit coupling flange on drive pinion shaft.

NOTE: The groove in the drive pinion and the groove in the joint flange must be in alignment.

5. Hold pinion flange with Flange Wrench C 3281.
6. Screw on the collared nut illustrated up to the marking applied beforehand.
7. Detach retainer wrench from joint flange.
8. With a torque wrench, measure torque to rotate pinion and record measurement.
9. Unscrew the marked nut.
10. Reattach retainer wrench to joint flange.
11. Screw on new collared nut and tighten carefully in stages until the previously value of torque to rotate is exceeded by 0.5 Nm. (4.4 inch lbs.).

CAUTION: The total friction moment must not be obtained by slackening the collared nut. Avoid overtightening the collared nut otherwise the compression ring inside will be compressed and will have to be replaced. This requires total disassembly of the gear set.





12. Cut the collar of the tightened collared nut (Fig. 30).





13. Bend collar so it touches the wall of the slot in the pinion shaft (Fig. 31).
14. Connect propeller shaft to pinion flange.





15. Pour in oil up to bottom edge of oil filler hole (Fig. 32).
16. Screw in oil filler plug and tighten to 100 Nm (74 ft. lbs.).
17. Install wheels at rear axle.
18. Operate brake pedal several times until brake pads contact brake discs (brake pressure built up).
19. Attach rear brake cables if removed and adjust parking brake.