Adjust gear backlash at differential assembly

AR35.30-B-0475HD

Adjust gear backlash at differential assembly

03.08.2018

Rear axle

740.881/885 in model 963, 964

1

Adjustment device

2

Dial gauge (assembling measure)

3

Square spike

4

Dial gauge (backlash of the flank)

5

Dial indicator holder

6

Threaded ring



Install

1

Install the bolts on the bearing cap

 Tighten the bolts on the bearing cap with the Adjustment tightening torque.

 Bearing cap of the transverse differential assembly

*BA35.30-B-1006-02HD

2

Install the dial gauge holder (5) with the dial gauge (4) on the differential assembly casing

 The probe pin of the  dial gauge (4) should be in most upright position as possible on the flank of one tooth of the ring gear, with a previous tension of 1 mm.

 Dial gage

*001589532100

 Dial indicator holder

*363589022100

3

Install the threaded rings (6)

 Square drift

*312589040700

4

Install the adjustment device (1) on the bearing covers

 Calibrate the measure of the  Adjustment device (1) using the  Measuring plate in the specified value.

Distance between bearings

*BE35.31-B-1002-03HD

 Measuring plate

*740589002100

 Clearance checker

*620589032100



Measure

5

Measure the backlash between the teeth of the ring gear/pinion assembly

 Measure the backlash in four points displaced 90° from each other.
Position the  dial gauge (4) on the tooth of the ring gear that presents the lower backlash.

 Adjust the backlash between the teeth with the Initial backlash by turning the threaded rings (6).

 Spin the ring gear with the differential, at least, two turns to seat the tapered roller bearings.

Axial play between ring gear and pinion

*BE35.31-B-1001-03HD

 Square drift

*312589040700

Adjust

6

Tighten the bolts in the bearing cover with tightening torque

 Tighten the bolts in the bearing cover with the Final tightening torque.

 Bearing cap of the transverse differential assembly

*BA35.30-B-1006-02HD

7

Adjust the backlash between the teeth of the ring gear/pinion assembly

 Measure the backlash in four points displaced 90° from each other.
Position the  dial gauge (4) on the tooth of the ring gear that presents the lower backlash.

 Adjust the backlash between the teeth with the Final backlash by turning the threaded rings (6).

Axial play between ring gear and pinion

*BE35.31-B-1001-03HD

 Square drift

*312589040700

8

Firmly spin the ring gear several times until the value indicated on the dial gauge (1) does not change anymore



Check

9

Check the backlash between the teeth of the ring gear/pinion assembly

Axial play between ring gear and pinion

*BE35.31-B-1001-03HD

If the backlash is different from the specified Final backlash:



Proceed from Step 7.

Differential. ring ear and pinion check values

Number

Designation

Rear axle 740.880/881/884/885

BE35.31-B-1001-03HD

Axial play between ring gear and pinion

Initial play

mm

0,30 0,05

End play

mm

0,25 0,05

Differential. ring ear and pinion check values

Number

Designation

Rear axle 740.880/881/884/885

BE35.31-B-1002-03HD

Distance between bearings

mm

270,06 0,05

 Transmission to rear axle

Number

Designation

Rear axle 740.881/885

BA35.30-B-1006-02HD

Bearing cap of the transverse differential assembly

M16x1.5

Adjustment tightening torque

Nm

50

Final tightening torque

Nm

380