Disassembling and assembling pinion housing with drive pinion

AR35.30-B-0470HD

Disassembling and assembling pinion housing with drive pinion

03.08.2018

Rear axle

740.881/885 in model 963, 964

1

Collar nut

2

Intermediate gear

3

Tapered roller bearing (outer)

4

Tapered roller bearing race ring (outer)

5

Oil collecting plate

6

Differential assembly casing

7

Spacer washer

8

Spacer sleeve

9

Compensating washer

10

Tapered roller bearing race ring (inner)

11

Tapered roller bearing (inner)

12

Drive pinion



Remove

1

Remove the differential assembly

AR35.30-B-0432HD


Use a proper equipment to secure the differential assembly (1) firmly.
Otherwise, the differential assembly can fall (1) and cause accidents or damages on the axle.

2

Remove the cover of the differential assembly

AR35.30-B-0350HD

3

Remove the crown with the differential

AR35.30-B-0464HD

4

Remove the longitudinal differential

AR35.30-B-0467HD

5

Unlock and remove the collar nut (1)

AR35.30-W-0432-05A


Do not use pneumatic bolt machine.
Otherwise, the pinion (12) or the differential assembly casing (6) can be damaged.

 Impact-type box wrench

*001589220900

 Ratio wrench

*000589696300

 Blocking device

*748589003100

6

Remove the intermediate gear (2)

7

Remove the pinion (12)

 Remove by pressing the pinion (12) downwards.

 Ensure that the pinion (12) does not fall.

8

Remove the tapered roller bearing (3) from the pinion (12)

9

Remove the spacer washer (7) and the spacer bushing (8) from the pinion (12)

10

Remove the oil baffle plate (5) from the differential assembly casing (6)

11

Remove the race rings of the tapered roller bearing (4, 10) from the differential assembly casing (6)

 Utilize appropriate tool

12

Remove the compensating washer (9)

13

Remove the inner tapered roller bearing (11) from the pinion (12)

 Use a proper tool.



Install

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

14

Heat up the tapered roller bearing (11) to approx. 80 °C and install it on the pinion (12) up to the stop

15

Determine the thickness of the spacer washers (9) of the pinion (12)

AR35.30-B-0470-03HD

 Measure the distance from the bottom of the housing of the race ring of the tapered roller bearing (10) up to the bearing seat of the differential assembly casing (6) before installing the race ring of the tapered roller bearing (10).

16

Install the oil baffle plate (5) in the differential assembly casing (6)

17

Install the race ring of the tapered roller bearing (4) in the differential assembly casing (6)

18

Install the race ring of the tapered roller bearing (10) in the differential assembly casing (6)

 With the compensating washer (9) already installed in the housing of the differential assembly casing (6).

19

Install the pinion (12) in the differential assembly casing (6)

 Holding device

*741589032100

20

Place the spacer bushing (8) and the spacer washer (7) on the pinion (12)

 Ensure that the pinion (12) does not fall.

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

21

Heat up the tapered roller bearing (3) to approx. 80 °C and install it on the pinion (12)

22

Install the intermediate gear (2)

 Install the new collar nut (1) and tighten it with the specified tightening torque, but do not lock it yet.

 Collar nut on drive pinion ring gear

*BA35.30-B-1002-02HD

 Impact-type box wrench

*001589220900

 Ratio wrench

*000589696300

 Blocking device

*748589003100

23

Check the friction torque of the tapered roller bearing (3, 11)

AR35.30-B-0470-04HD

 Friction torque of the pinion tapered roller bearings

*BA35.30-B-1011-02HD

 Socket wrench bit

*001589750900

 Torque wrench

*745589012100

If the friction torque is out of the specified value:



Remove the pinion (12) and the spacer washer (7), and carry out the procedure from the Step 15.

 If the Step 16 is already carried out, it is not necessary to carry it out again.

24

Lock the collar nut (1)

AR35.30-W-0432-03A

25

Install the longitudinal differential

AR35.30-B-0467HD

26

Install the bevel gear with the differential

AR35.30-B-0464HD

27

Install the longitudinal differential cap

AR35.30-B-0350HD

28

Install the differential assembly

AR35.30-B-0432HD

 Transmission to rear axle

Number

Designation

Rear axle 740.881/885

BA35.30-B-1002-02HD

Collar nut on drive pinion ring gear

M55x1.5

Nm

855

 Transmission to rear axle

Number

Designation

Rear axle 740.881/885

BA35.30-B-1011-02HD

Friction torque of the pinion tapered roller bearings

Nm

4 ... 12