Disassembling and assembling pinion housing with drive pinion

AR35.30-I-0470A

Disassembling and assembling pinion housing with drive pinion

24.4.07



Removing

1

Remove pinion housing with drive pinion

Rear axle 746.642/645/646/647/669/

680/682, 748.800

AR35.30-I-0469A

Rear axle 746.681

AR35.30-I-0469B



Disassemble

2

Detach propeller shaft flange from drive pinion shaft (1)



*684589013100



*684589073300

3

Press drive pinion shaft (1) out of the drive pinion housing (7)

4

Remove radial seal (2)

5

Remove roller cage (3)

6

Remove bearing spacer ring (4)

7

Remove bearing outer races (5, 6) from drive pinion housing (7)

 Drive out bearing outer racers (5, 6) using a narrow drift.

8

Detach roller cage (8) from drive pinion shaft (1) and pry off bearing inner race (9)



*684589083300

9

Remove circlip (arrow)

10

Detach cylindrical roller bearing (10) from drive pinion shaft (1)



*684589083300



Checking

11

Clean components and check for wear and damage

 Replace worn or damaged components.



Assembly

 Danger!

Risk of injury to skin and eyes caused by handling hot or glowing objects.

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

AS00.00-Z-0002-01A

12

Press on cylindrical roller bearing (10) as far as the end stop on drive pinion shaft (1)

 Heat up cylindrical roller bearing (10) in the oil bath to approx. 80 °C. Pay attention to correct seat of the cylindrical roller bearing.



*684589161500

13

Install circlip (arrow)

14

Install bearing inner race (9)

 Heat up bearing inner race (9) in the oil bath to approx. 80 °C. Use a suitable drift for installing the bearing inner race.

15

Install roller cage (8)

16

Press bearing outer races (5, 6) into drive pinion housing (7)



*684589171500

17

Press drive pinion housing (7) onto drive pinion shaft (1)

 Pay attention to proper installation position

18

Install bearing inner race (11)

 Heat up bearing inner race (11) in the oil bath to approx. 80 °C. Use a suitable drift for installing the bearing inner race.

19

Insert bearing spacer ring (4)

20

Install roller cage (3)

21

Measure friction torque on drive pinion

 If friction torque is not within the specified value:



To increase the friction torque, select a bearing spacer ring (4) of reduced thickness.

To reduce the friction torque select a bearing spacer ring (4) of increased thickness.

AR35.31-I-0530-04A

*BE35.31-N-1001-02A

22

Install new radial sealing ring (2)



*684589151500

23

Install propeller shaft flange



*BA35.30-N-1001-06B



*684589013100



Install

24

Install pinion housing with drive pinion

Rear axle 746.642/645/646/647/669/

680/682, 748.800

AR35.30-I-0469A

Rear axle 746.681

AR35.30-I-0469B

Number

Designation

Rear axles 746.642/645/646/647/669/682,
748.800

Rear axle 746.680/681

BE35.31-N-1001-02A

Friction torque of tapered roller bearings in drive pinion housing

Nm

1,0 to 3,5

1,7 to 4,2

Number

Designation

Rear axle 746.642/645/646/647/669/680/
681/682,
748.800

BA35.30-N-1001-06B

Nut, propeller shaft flange to drive pinion shaft

Nm

480