Rear axle - oil change

AP35.00-T-3501AA

Rear axle - oil change

03.05.2019

Rear axle

748.1

Shown on rear axle 748.134

2

Oil drain screw of portal housing

3

Oil filler screw of portal housing

5

Oil level inspection screw, portal housing

Shown on rear axle 748.120

1

Oil drain screw, rear axle bracket

2

Oil drain screw of portal housing

4

Oil filler screw of rear wheel hub

 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

1

Conduct a road test

 The rear axle oil must be at operating temperature for the oil change.

2

Park vehicle on a horizontal surface.

3

Clean the area around the oil drain screw of the rear axle bracket (1), oil drain screws of portal housing (2), oil level inspection screws of portal housing (5), oil filler screws of rear wheel hub (4) and oil filler screw of portal housing (3)

 On the newer generation of rear axles, there is no oil drain screw on the rear axle bracket (1).
Depending on the model and version, instead of the oil filler screw of the portal housing (3) an oil level inspection screw of portal housing (5) is fitted to the portal housing.

4

Remove rear axle bracket oil drain screw (1)

 Only carry out if the oil drain screw of rear axle bracket (1) is fitted. Collect oil with a suitable container and allow to run out completely.

5

Remove portal housing oil drain screws (2)

 Collect oil with a suitable container and allow to run out completely.

6

Screw in oil drain screws of portal housing (2)

 Install new seals. Clean oil drain screws of portal housing (2).

 Rear axle 748.12/13Oil drain screw of portal housing

*BA35.10-N-1002-03L

 Torque wrench

*001589672100

7

Screw in oil drain screw of rear axle bracket (1)

 Only carry out if the oil drain screw of rear axle bracket (1) is fitted. Replace seal. Clean oil drain screw of rear axle bracket (1).

 Rear axle 748.12/13Oil drain screw rear axle housing

*BA35.10-N-1001-03L

 Torque wrench

*001589672100

8

Remove portal housing oil filler screw (3).

 Only carry out if the oil filler screw of rear axle bracket (3) is fitted.

9

Remove portal housing oil level inspection screw (5)

 If fitted, in addition remove the oil level inspection screw of portal housing (5) at the opposite portal housing.

10.1

Pour oil into the hole of the oil filler screw of the portal housing (3) until the oil flows out at the hole of the oil level inspection screw of the portal housing (5)

On portal housing (3) with oil filler screw

Notes on operating fluids

AH00.40-N-0001-01A

 Rear axle 748.12/134/135Hypoid gear oil

*BF35.10-N-1003-01F

10.2

Pour in oil until it overflows at the holes of the oil level inspection screws of portal housing (5)

On portal housing (3) without oil filler screw

Notes on operating fluids

AH00.40-N-0001-01A


The oil must be poured in at the two holes for the oil level check plugs in the portal housing (5).
Damage to the portal axle can otherwise occur.

 The filling time can take up to 70 minutes.

 Rear axle 748.12/134/135Hypoid gear oil

*BF35.10-N-1003-01F

11

Screw in oil level inspection screws of portal housing (5)

 If fitted, in addition screw in the oil level inspection screw of portal housing (5) at the opposite portal housing.
Replace seal. Clean oil level inspection screw of portal housing (5).

 Rear axle 748.12/13Oil filler screw of portal housing

*BA35.10-N-1003-03L

 Torque wrench

*001589672100

12

Screw in oil filler screw of portal housing (3)

 Only carry out if the oil filler screw of rear axle bracket (3) is fitted.
Replace seal. Clean oil filler screw of portal housing (3).

 Rear axle 748.12/13Oil filler screw of portal housing

*BA35.10-N-1003-03L

 Torque wrench

*001589672100

13

Jack up vehicle at rear axle



Jack up vehicle at rear axle and place on axle stands

MODEL 671

AR00.60-T-1000-03A

 Raise the rear axle until the wheels can be rotated freely.

14

Remove rear wheel hub oil filler screw (4)

 To loosen, position the oil filler screw of rear wheel hub (4) vertically upwards and loosen carefully in order to avoid the oil escaping in an uncontrolled manner.

15

Drain oil from the rear wheel hub

 To do this, position the hole of the oil filler screw of rear wheel hub (4) vertically downwards and collect oil in a suitable container and allow to run out completely.

16

Turn the rear wheel hub through 90° so that the hole of the oil filler screw of rear wheel hub (4) is in a horizontal position

17

Lower vehicle onto wheels

18

Pour oil into the rear wheel hub

Notes on operating fluids

AH00.40-N-0001-01A

 Pour oil into the rear wheel hub via the hole of the oil filler screw of rear wheel hub (4) until it overflows. Vehicle must be horizontal.

 Rear axle 748.12/13Hypoid gear oil

*BF35.20-N-1001-01F

19

Remove oil filler screw of rear wheel hub (4)

 Replace seal. Clean oil filler screw of rear wheel hub (4).

 Rear axle 748.12/13Oil filler screw of rear wheel hub

*BA35.20-N-1003-06M

 Torque wrench

*000589642100

 Rear axle

Number

Designation

Rear axle 748.12/13

BA35.10-N-1001-03L

Oil drain screw rear axle housing

M241.5

Nm

70

M361.5

Nm

130

 Rear axle

Number

Designation

Rear axle 748.12/13

BA35.10-N-1002-03L

Oil drain screw of portal housing

Nm

70

 Rear axle

Number

Designation

Rear axle 748.12/13

BA35.10-N-1003-03L

Oil filler screw of portal housing

Nm

70

 Hub

Number

Designation

Rear axle 748.12/13

BA35.20-N-1003-06M

Oil filler screw of rear wheel hub

Nm

35

 Rear axle

Number

Designation

Rear axle 748.12

Rear axle 748.134/135

BF35.10-N-1003-01F

Hypoid gear oil

Filling capacity

Liter

18...21

16

Sheet

AH00.40-N-0001-01A

AH00.40-N-0001-01A

Sheet

-

-

 Wheel hub, hub cap

Number

Designation

Rear axle 748.12/13

BF35.20-N-1001-01F

Hypoid gear oil

Filling capacity

Liter

0,7

Specifications for Operating Fluids, Sheet

AH00.40-N-0001-01A