Adjust gear backlash at differential assembly

AR35.30-B-0475B

Adjust gear backlash at differential assembly

31.10.2019

Rear axle

741.91, 742.80, 743.0/2 in model 368, 382, 384

Rear axle

741.93, 743.0/1/3 in model 384, 386, 693

Rear axle

741.93, 743.1 in model 386, 958

Rear axle

743.4 in model 688, 979

Rear axle

745.5/9, 746.86/87/888/889/97/980/982/990/991

Rear axle

745.5/9, 746.86

Rear axle

745.9, 746.86/880/97/980/982/991

Rear axle

746.983/994/995/997

Modification notes

14.01.2019

Bolts attaching the bearing caps

BA35.30-B-1001-05B

21.08.2019

Clearance between ring gear/pinion

BE35.31-B-1001-03C

30.10.2019

Clearance between ring gear/pinion

BE35.31-B-1001-03C

1

Dial indicator

2

Square spike

3

Adjustment device

1

Tighten the threaded rings

 Rotate until the bearings do not show slack or preload.

 The crown should still rotate with little clearance between the teeth.

 Square drift

*312589040700

2

Firmly tighten the threaded rings and at the same time turn the sprocket

 With a suitable tool, apply a few firm strokes on the bearing shells and to the side of the sprocket.

3

Loosen the threaded rings and, next, screw them on again until they touch gently

 At this position, the rings should be snugly fit and show no preload.

4

Secure the bracket with the dial indicator (1) with magnetic to the differential assembly housing

 Guide the comparator feeler (1) over the pressure flank of one of the sprocket teeth.
Leave the dial indicator (1) with a preload of 1 mm.

 Dial gage

*001589532100

 Dial indicator holder

*363589022100

5

Measure the clearance between the teeth of the sprocket and pinion set

 Measure at four lag points of 90° between each other and determine the point of smallest clearance.

6

Axially shift the sprocket with differential until the required minimum clearance is obtained

 In the smallest clearance position.

 Loosen a threaded ring and tighten the other one to the same extent, so as to prevent changing the bearing settings.

.Clearance between ring gear/pinion

*BE35.31-B-1001-03C

7

Remove the dial indicator holder and the dial indicator (1) and then tighten the bearing cap screws opposite from the sprocket teeth

 Rear axle 743.0/2/3. 746.98Bolts attaching the bearing caps

*BA35.30-B-1001-05B

 Rear axle 741.91/93/93, 742.80, 745.95/98, 746.86/87/97Mounting bolt of the bearing cover

*BA35.30-B-1001-05G

8

Secure the adjusting device on the bearing cap already tightened, with the flag parallel to the crown

 Measurement stop

*354589002100

9

Secure the holder containing the magnetic block and the dial indicator by supporting the probe at a right angle on the flag, set to zero and pre-loaded with 1 mm

 Dial indicator holder

*363589022100

 Dial gage

*001589532100

10

Rotate the crown continuously while tightening the threaded ring from the crown teeth side, until obtaining the initial preload on the dial indicator

 For used bearings, try to maintain the lower limit; for new bearings, maintain the upper limit.

.Preload of the satellite box bearings

*BE35.30-B-1001-03A

 Square drift

*312589040700

11

Tighten the screws on the bearing cap on the crown teeth side

 Rear axle 743.0/2/3. 746.98Bolts attaching the bearing caps

*BA35.30-B-1001-05B

 Rear axle 741.91/93/93, 742.80, 745.95/98, 746.86/87/97Mounting bolt of the bearing cover

*BA35.30-B-1001-05G

12

Turn the crown and check the final preload

.Preload of the satellite box bearings

*BE35.30-B-1001-03A

13

Check the clrearance between the teeth of the crown & pinion set

 If the clearance is not within the prescribed values, repeat the adjustment process.

.Clearance between ring gear/pinion

*BE35.31-B-1001-03C

14

Adjust the pressure screw so that, after the counter-locknut is tightened, the dial indicator shows the bearing cap displaced from 0.010 to 0.025 mm

15

Check the contact marks of the crown teeth

.

AR35.30-B-0475-02A

Prussian blue, paint

*BR00.45-Z-1058-07A

Differential

Number

Designation

Rear axle 741.9, 742.8, 743.0, 743.1, 743.2, 743.3, 745.5, 745.9, 746.5, 746.8, 746.97, 746.980, 746.982, 746.983, 746.990/991/994/, 746.995/997

Rear axle 743.4

BE35.30-B-1001-03A

Preload of the satellite box bearings

Before tightening the screws of the bearing lid

mm

0,030...0,050

0,005...0,020

After tightening the screws of the bearing lid

mm

0,040...0,070

0,020...0,040

Differential. ring ear and pinion check values

Number

Designation

Rear axles 743.0, 743.1, 743.2, 743.3

743.4 Rear axles

BE35.31-B-1001-03C

Clearance between ring gear/pinion

mm

0,20...0,28

0,20...0,28

Differential. ring ear and pinion check values

Number

Designation

746.980/982/983 Rear axle

Rear axles 742.80, 745.5, 745.9, 746.5, 746.86, 746.87, 746.880, 746.97

BE35.31-B-1001-03C

Clearance between ring gear/pinion

mm

0,20...0,28

0,20...0,28

Differential. ring ear and pinion check values

Number

Designation

Rear axles 741.91/93/95, 746.991/994, 746.995/997

BE35.31-B-1001-03C

Clearance between ring gear/pinion

mm

0,20...0,28

 Ring gear with differential

Number

Designation

Rear axle 743.0/2/3. 746.980/982/983

BA35.30-B-1001-05B

Bolts attaching the bearing caps

M16Self-locking

Nm

220...230

 Ring gear with differential

Number

Designation

Rear axle 741.935/937

Rear axle 741.91, 742.80, 745.53/95/98, 746.59/86/87/97, 746.99

BA35.30-B-1001-05G

Mounting bolt of the bearing cover

M18 Self-locking

Nm

380...400

380...400

Repair materials

Number

Designation

Order number

BR00.45-Z-1058-07A

Prussian blue, paint

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