Adjust preload of tapered roller bearings

AR35.30-B-4302-01D

Adjust preload of tapered roller bearings

Rear axle

746.231/305 in model 934.24, 938.14, 958.4

Rear axle actuation

Number

Designation

Rear axle 746.231/305

BE35.30-B-1001-01A

Ring gear teeth clearance

mm

0,15...0,35

Rear axle actuation

Number

Designation

Rear axle 746.231/305

BE35.30-B-1002-01A

Differential case bearings pre-load

New tapered roller bearings

mm

-

Used tapered roller bearings

mm

-

 Central actuation with differential

Number

Designation

Rear axle 746.231/305

BA35.30-B-1009-03J

Safety lock bolt to the bearing cap

M8

Nm

25

 Central actuation with differential

Number

Designation

Rear axle 746.231/305

BA35.30-B-1010-03J

Differential mounting bearing cap

M20x1.5

1st stage

Nm

200

2nd stage

° angular

90

1

Perform the pre-tightening (1st stage) of the bearing cover screws (5) and an adjustment of the gap between the toothed crown.  

 Before perform the preload of tapered roller bearings.

2

Change the  adapter kit (9) of the  measurement device (2).

 It is necessary to change the  adapter kit (9) only for work in axes HD6.

3

Install the  dial indicators (1) on  adapter kit (9) of the  measurement device (2).

4

Install the  measurement device (2) on the differential assembly housing bearings (3).

 The  dial indicators (1) on  measurement device (2), must be previously zeroed with the use of the  indicated gauger (8).

 Observe the correct support of the  measurement device (2) on the differential assembly housing bearings (3).

 When installing the  measurement device (2) there should be no pre-load on the conical roller bearings.

5

Gradually tighten the threaded ring (6) with the  mandrel (7) until you reach a   preload (A) of the satellite box bearings in the  dial indicators (1).

 Leave at least the nominal value for the preload (A) of the bearings of the satellite box, so that the nominal value is not exceeded after the final torque (2nd stage) of the bolts (5).

6

Turn the toothed crown to a few times and observe if there was a drop in the precharging. If necessary, correct it using the threaded ring (6).

7

Tighten the bearing cap screws (5) using prescribed torque (2nd step).  

8

Check again the preload of the bearings of the satellite box.

 The amount found out must fall within the indicated nominal value. If the nominal value is exceeded, loose the threaded ring (6) and repeat operations from the step 3.

9

Remove the  measurement device (2) and check the prescribed value for the clearance between the toothed crown teeth.  

 If the nominal value has not been reached repeat the instructions from the step 3.

10

Install safety locks of the threaded rings.  