Drive Pinion Seal, Replacing

Drive pinion seal, replacing
- Observe general repair instructions.

Special tools and equipment





- 3403 Thrust piece





- A hole for checking oil leakage for the oil seal in the drive pinion and the oil seal in the intermediate flange is located on the left-hand side of the intermediate flange.

Removing
- Remove center differential.
- Remove intermediate flange for front final drive.





- Take intermediate pinion -2- for front final drive off transmission housing.
- Pull input pinion -3- off output shaft.
Gear wheels, which have been dropped on the floor, must not be used again. If this happens, the transmission must be replaced.
Output pinion -1- remains on pinion shaft.
- Drive seal out with a drift.

Installing
Install in reverse order but note following:
- Coat outer circumference and sealing lip of oil seal with gear oil.
- Half fill space between sealing lip and dust lip with grease G 052 128 A1.





- Slide seal onto 3403 Thrust piece.
- Drive seal in with 3403 Thrust piece onto press piece stop.
The contact surface -A- of the thrust piece must rest on the output pinion -B-.





- Cover splines on end of shaft -arrow completely with adhesive tape, ensuring there are no folds or butt ends, so that seal is not damaged when sliding on input pinion.
- Install input pinion centered on input shaft.
Installing the input pinion without using great care can damage the sealing lips of the seal.





- Slide input pinion -3- together with intermediate pinion -2- onto stop (tapered roller bearing seat) in transmission housing.
Observe installation position of gears (pinion):
The gear wheel markings -arrows- face outward away from transmission.
- Install intermediate flange for front final drive.
- Install center differential.