Carrier Side Gears: Service and Repair

Replacing Differential Bevel Gears (Type K)
Final Drive Removed -

Remove final drive housing, contained in Replace drive pinion with crown wheel.
Refer to 33 12 551.





Press off pulse spider.

Installation:
Press on pulse alternator wheel with special tool 33 1 304 (union ring).





Remove crown wheel (cold).

Caution:
If the bearings are also replace, first install crown wheel after determining friction torque determination - replace bearings for differential.
Refer to 33 11 731.

Installation:
Clean tapped bores thoroughly (tapper).
Heat plate spring to maximum 100°C (thermo-chrome pin).
Mount crown wheel with two locally manufactured staybolts for guiding.

Caution: Use new ring gear bolts.





Installation:
Tighten new bolts in order of 1 ... 8.
Tightening Torque, refer to Technical Data 33 12 1AZ.





Drive out key (9) and differential shaft (10).

Installation:
The bore in differential shaft (110) is countersunk on one end.
Drive in key (9) from this end.





Turn out differential pinion gears with drive flange. Remove differential side gears with shims.





To gauge the shims, install both new differential side gears (1) with disk springs (3) without shims (2).

Center differential side gears with the drive flange.





Install special tool 33 1 306 (pressure piece) on one side.

Screw in special tool 33 1 441 (threaded plate) with special tool 33 1 430 (screw).

Tighten special tool bolt to spread differential side gears so far apart, that the drive flange can just barely be turned.





Install differential pinion gears exactly opposite each other.

Move differential gears to installed position by turning drive flange.

Remove special tools.





Drive in differential gear shaft.

Turn differential pinion gears with the drive flange and stop them at the highest point of tooth mesh (hardest to turn).





For measurement operation, install special tool 33 1 441 (threaded plate) and special tool 33 1 431 (screw).

If applicable, open up thread plate slightly to make it easier to insert the dial gage. Screw in bolt far enough, that the shaft gear is on "block".





Secure special tool 33 1 420, 00 2 505 and 00 2 506 to final drive housing.

Set dial gage on blocked shaft gear to zero with preload.





Unfasten special tool 33 1 431 (screw).

Read off dial gauge, record value and allocate to one side, e.g. side of crown wheel 0.36 mm.

Repeat measurement on opposite differential side gear and note down value, e.g. 0.28 mm.





Remove differential side gears and diaphragm springs.

Caution: Don't mix up differential side gears and diaphragm springs.





Measure plate spring with micrometer, record values and allocate, e.g. crown wheel 1.16 mm, other side 1.18 mm.

Determine correct thickness of shim taking into account the clearance of 0.02 ... 0.07 mm.

Example:





Part 1 of 2





Part 1 of 2

Thickness of shim: 1.50 mm - 1.44 mm = 0.06 mm
Shims (2) are available in gage steps of 0.05 mm.





Install shims (2) of determined thickness.