Differential Assembly: Description and Operation

Components

The maximum possible care and cleanliness and proper tools are essential to ensure satisfactory and successful transmission repairs. The usual basic safety precautions also naturally apply when carrying out vehicle repairs.

A number of generally applicable instructions for individual repair operations, which are otherwise mentioned at various points in this repair information, are summarized here.

A list of the special tools used in this repair information are listed in: "Workshop equipment and tools" or "Special tools".

Transmission

• When replacing the rear final drive the oil level in the rear final drive must be checked and, if necessary, corrected. Refer to => [ Checking Rear Final Drive Gear Oil Level ] Service and Repair.

• Capacities and specifications, refer to => [ Code Letters, Transmission Ratios and Capacities ] Code Letters, Transmission Ratios and Capacities.

• When assembling mounting brackets as well as waxed components clean contact surfaces. The contact surfaces must be free of wax and grease.

Gaskets and Sealing Rings

• Replace O-rings.

• Radial shaft oil seals.

Before Installing

Lightly oil the outer circumference and pack the space between the sealing lips - Arrow - half full with sealing grease (G 052 128 A1).





After Installation

Check the gear oil in the rear final drive; if necessary top off to the lower edge of the oil filler hole. For specifications, refer to => [ Code Letters, Transmission Ratios and Capacities ] Code Letters, Transmission Ratios and Capacities.

Locking Elements

• Replace circlips.

• Do not overstretch circlips.

• Circlips must be properly seated in the base of the groove.

• Replace spring pins.





Installation position: Slot longitudinal to line of force.

Nuts and Bolts

• Nuts and bolts which secure covers and housings should be loosened and tightened diagonally.

• Parts which are particularly sensitive must not be tilted; loosen or tighten diagonally in stages.

• Tightening torques stated apply to non-lubricated nuts and bolts.

• Replace self locking bolts and nuts.

• Make sure with all screw connections that contact surfaces as well as bolts and nuts are only waxed after assembly, if necessary.

Bearings

• Attach needle bearing with the written side (greater plate thickness) to the installing tool.

• Install new taper roller bearings in delivery condition and do not oil.

• Always replace taper roller bearings on one shaft together and use new bearings from a single manufacturer.

• Heat inner races to approximately 100° C before installing.

• Do not interchange outer or inner races of bearings of the same size. The bearings are paired.

Adjustment Shims

• Check thickness of shims by measuring at several points with a micrometer. Different tolerances make it possible to obtain exact shim thickness required.

• Check for burrs and damage.

• Install only adjustment shims which are in perfect condition.