Measuring gear backlash between crown wheel and pinion and correcting if necessary
Test values for rear axle differential
Number
Designation
Model 124
Model 129
Model 170
BE35.31-P-1002-03A
Gear backlash between crown wheel and pinion
mm
0,08-0,14
0,08-0,14
0,08-0,14
Test values for rear axle differential
Number
Designation
Model 201
Model 202
BE35.31-P-1002-03A
Gear backlash between crown wheel and pinion
mm
0,08-0,14
0,08-0,14
Test values for rear axle differential
Number
Designation
Model 208
Model 210
BE35.31-P-1002-03A
Gear backlash between crown wheel and pinion
mm
0,08-0,14
0,08-0,14
201 589 03 21 00
Tooth backlash gauge
P35.31-0427-01
1 Insert and clamp backlash measuring instrument (037) with dial gauge into left-hand bore in differential housing.
2 Set dial gauge to "0" with 3 mm preload.
3 Hold drive pinion on joint flange and rotate dial indicator holder on handle (arrow) alternately to left and right, read off gear backlash while doing so.
4 Carry out measurement 4 times. Turn the crown wheel approx. 90° further each time.
The adjustment of the tapered roller bearings and gear set is OK if the spread dimension (expansion) of the rear axle housing and the gear backlash are within the range of the specifications. If these values are not achieved, the adjustment must be repeated using thinner or thicker locking rings as appropriate.
5 Remove backlash measuring instrument (037).
1st example
Measurement: The gear backlash is correct but the expanded dimension of the rear axle housing is too low, e.g. 0.05 mm measured expanded dimension value.
Correction: Mount a 0.05 mm thicker shim on both sides, in the process the gear backlash can change slightly!
2nd example
Measurement: The expanded dimension is correct, but the gear backlash is too large.
Correction: On the left assembly side a circlip which is thinner by the missing amount is to be installed.
Install a thicker locking ring on the right-hand side (crown wheel side).
If the gear backlash is too low, proceed in the opposite manner.
