Adjust preload of tapered roller bearings

AR35.30-B-4302-01XD

Adjust preload of tapered roller bearings

Determining installed dimension of differential assembly

AR35.30-B-0475-01XD

Rear axle

748.590/594 in model 934.2, 958.4

Rear axle actuation

Number

Designation

Rear axle 748.590/594 in model 934.2, 958.4

BE35.30-B-1001-01K

Ring gear teeth clearance

mm

0,25...0,33

Rear axle actuation

Number

Designation

Rear axle 748.590/594 in model 934.2, 958.4

BE35.30-B-1002-01K

Pre-load of the differential bearings

mm

0,100...0,200

 Central actuation with differential

Number

Designation

Rear axle 748.590/594

BA35.30-B-1003-03L

Safety lock bolt to bearing cap

M8

Nm

25

 Central actuation with differential

Number

Designation

Rear axle 748.590/594

BA35.30-B-1004-03L

Differential mounting bearing cap

M22x1.5

1st stage

Nm

200

2nd stage

° angular

90

1

Before starting the tapered roller bearings pre-load regulation procedure with the  adjustment device (2), adjust the differential set assembly dimension.

2

Tighten the bearing cap screws (6) up to the prescribed torque (1st step)   .

3

Install the  adjustment device (2) with the  dial gauges (1) on the flat surface of the differential case (3).

 Pay attention to the correct positioning of the adjustment device (2)on the flat surface of the differential case (3).

 During the installation of the adjustment device, a minor variation of the dial gauge hand can occur, this is due to deformations at the bearings or at the differential set case. Small variations are accepted.

4

Tighten alternately the threaded rings (4) with the respective   slotted nut wrench (5) until you obtain  at the dial gauges (1) the pre-load value (A) of the differential bearings.

 Allow the lowest nominal value indicated for the pre-load (A), to ensure that after the bearing cap bolts (6) final torque (2nd step), that the nominal value is not exceeded.

5

Turn the ring gear some times for the tapered roller bearings seating and check if any variation of the pre-load has occurred  at the  dial gauges (1). If necessary, correct it by adjusting the threaded rings (4) again.

6

Tighten the bearing cap screws (6) up to the prescribed torque (2nd step)  .

7

Measure again the pre-load  of the tapered roller bearings.

 The amount found out must fall within the indicated nominal value. If the nominal value is not reached, unscrew the bolts (6) repeat the operations from step 1 on.

8

Remove the  adjustment device (2) and check the teeth flanks clearance value  at the differential set.

 If the differential set teeth flanks clearance nominal value is exceeded, unfasten the threaded rings (4) and the bolts (6) and repeat the operations as from the 1st step.

9

Install the safety locks and tighten the threaded rings (4) lock bolts  .