Adjust gear backlash at crown wheel and pinion

AR35.30-T-0475BA

Adjust gear backlash at crown wheel and pinion

11.8.04

Danger!

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and undeburred vehicle parts.

Deburr replacement panels.

AS00.00-Z-0017-01A

1

Remove final drive.

AR35.30-T-0432BA

2

Mount ring gear and pinion on assembly stand using assembly adapter

 The ring gear and pinion must at least be fastened with 4 bolts respectively in the area of the tapered roller bearings of the differential cage and ring gear on the assembly plate.

*WH58.30-Z-1024-07A

*WH58.30-Z-1027-07A

3

Detach locking plates (4) of threaded rings

4

Tighten the bolts (2) of the bearing cap (3)

 Only carry out if the bolts (2) have been loosened previously Only tighten the bolts (2) with the 1st stage tightening torque. Turn the ring gear in the process and apply gentle blows to the housing or bearing cap (3) using a plastic mallet. This will center the tapered roller bearings.



*BA35.30-N-1010-03H



*000589620901

5

Loosen threaded rings

 Loosen the threaded rings until in the process the preload of the tapered roller bearing is reduced and the threaded rings just still abut tapered roller bearings.



*312589040700

6

Turn ring gear

 Turn the ring gear at least 10 revolutions.

7

Attach dial indicator holder (6) with dial indicator (5)

 Attach the dial indicator holder (6) with the dial indicator (5) to the rear axle gear housing and place the dial indicator tip on a tooth of the ring gear under preload.



*363589022100



*001589532100



Measure

8

Measure gear backlash

 Check the gear backlash at at least three points offset by 120°. Turn the ring gear alternately by hand until the ring gear meets a perceptible resistance in each case. In the process read off the actual value for gear backlash on the dial indicator (5). If necessary, set gear backlash to correct value.

*BE35.30-N-1001-01G



*363589022100



*001589532100

Adjust

9

Adjust specified value of gear backlash

 Adjust specified value of gear backlash screwing the threaded rings in or out. Turn the ring gear in the process and apply gentle blows to the housing or bearing cap (3) using a plastic mallet. This will center the tapered roller bearings.

*BE35.30-N-1001-01G



*312589040700

10

Adjusting preload of tapered roller bearings

AR35.30-T-4302-01BA



Check

11

Check geartooth backlash.

 Once the preload of the tapered roller bearings has been adjusted the gear backlash must again be checked at at least three points offset by 120° (see step 8). Repeat entire setting process (steps 9, 10), if necessary.

*BE35.30-N-1001-01G



*363589022100



*001589532100

12

Tighten the bolts (2) of the bearing cap (3)

 Only carry out if the bolts (2) have been loosened previously Tighten the bolts (2) by the specified rotation angle.



*BA35.30-N-1010-03H

13

Install locking plates (4) of threaded rings



Notes on self-locking nuts and bolts

All models

AH00.00-N-0001-01A



*BA35.30-N-1009-03H



*000589642100

14

Detach ring gear and pinion from assembly stand

15

Install final drive

AR35.30-T-0432BA

Number

Designation

Rear axle
746.217

BE35.30-N-1001-01G

Specified value for crown wheel backlash

mm

0.22...0.30

Number

Designation

Rear axle
746.217

BA35.30-N-1009-03H

Screw of locking plate of differential bearing cap

M8

Nm

25

BA35.30-N-1010-03H

Bolt of differential bearing cap to axle housing

M20x1.5

1st stage

Nm

200

2nd stage

°

90

Number

Designation

WH58.30-Z-1024-07A

Universal assembly stand,

Firma Erwin Schairer GmbH D-72469 Meßstetten

WH58.30-Z-1027-07A

Assembly adapter for differential assembly, HO 6/HL 6,

Firma Erwin Schairer GmbH D-72469 Meßstetten