Remove/install front axle gear

AR33.30-P-0525MSA

Remove/install front axle gear

05.05.2020

Model

257 with engine 256 with transmission 725.0

with code M005 (Vehicles with 4MATIC/all-wheel drive)

Shown on front axle transmission 175

1

Front axle transmission

3a

Screw

3b

Screw

3c

Screw

4

Support brace

Shown on front axle transmission 175

1

Front axle transmission

2

Screw

3c

Screw

Shown on front axle transmission 175

1

Front axle transmission

5l

Radial shaft sealing ring

5r

Radial shaft sealing ring

 Caution

Risk of injury to skin and eyes due to handling of transmission oil. Health risk caused by swallowing transmission oil

Wear protective gloves, protective clothing and safety glasses.
Do not pour transmission oil into beverage bottles.

AS00.40-Z-0001-01A

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A



Remove

1

Remove propeller shaft from front axle differential (1).

AR41.10-P-0070MSA

2

Remove drain screw and drain hypoid gear oil from front axle differential (1) and collect with a suitable container.

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)With VAG 160

AR33.25-P-0300-01LWX

3

Remove rack-and-pinion steering.

AR46.20-P-0600FR

4

Remove right front axle shaft.

AR33.30-P-0620MSA

5

Remove intermediate shaft.

AR33.30-P-0625MSA

6

Remove starter-alternator control unit(N129).

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)

Model 257 with engine 256.9 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR15.40-P-0004MSA

7

Remove screws (2, 3a, 3b, 3c) and place front axle differential (1) onto front axle.

8

Remove support (4).

9

Remove front axle differential (1) downwards.

10

Check that pilot bushing in oil pan is correctly seated.

If problems exist,



Replace pilot bushing.

11

Remove radial shaft sealing rings (5l, 5r).


Do not damage seat of radial shaft sealing rings (5l, 5r).
Otherwise the front axle differential (1) will leak.

 Connect  internal extractor and  slide hammer puller to threaded rod of  extraction tool.

 Internal extractor

*203589033300

 Extraction tool

*221589043300

 Impact extractor

*602589003300

12

Check seat of radial shaft sealing rings (5l, 5r) for damage and galling.

If problems exist,



replace front axle differential (1).



Install

13

Install radial shaft sealing rings (5l, 5r) using drift.

 Replace radial shaft sealing ring (5l, 5r).

 Mit VAG 160
Drift set

*205589011500

 Mit VAG 175
Drift

*221589041500

14

Coat sealing lips of radial shaft sealing rings (5l, 5r) with transmission oil.



Universal hypoid gear oils (specification 235.7)

BB00.40-P-0235-07A

 Replace radial shaft sealing rings (5l, 5r).

15

Position front axle differential (1) on front axle.

16

Install support (4).

 Collar bolt, support to oil pan

*BA33.30-P-1011-03G

17

Attach front axle differential (1) to support (4).

AR33.30-P-0525-06AVG

 Collar bolt, front axle differential to support/oil pan

*BA33.30-P-1006-03G

 Collar bolt, front axle gear to engine support

*BA33.30-P-1007-03G

18

Screw drain screw into front axle differential (1) and tighten.

 With VAG 175
Replace seal.

 Replace drain screw.

 Front axle transmission drain screw

*BA33.30-P-1008-03G

19.1

Fill front axle transmission (1) with hypoid gear oil through the front axle shaft opening.

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)With VAG 175

 Hypoid gear oil

*BF33.30-P-1001-03F

 Hand pump

*210589007100

19.2

Fill front axle differential (1) via opening of filling screw with hypoid gear oil.

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)With VAG 160

AR33.25-P-0300-01LWX

 Replace filling screw.

 Replace drain screw.

Quick-acting adhesive Omnifit 100H (50 g)

*BR00.45-Z-1110-02A

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A

 Front axle transmission drain screw

*BA33.30-P-1008-03G

 Front axle transmission filling screw

*BA33.30-P-1014-03G

 Hypoid gear oil

*BF33.30-P-1001-03F

 Hand pump

*210589007100

20

Install starter-alternator control unit (N129).

Model 257 with engine 256 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)

Model 257 with engine 256.9 with transmission 725.0
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR15.40-P-0004MSA

21

Install intermediate shaft.

AR33.30-P-0625MSA

22

Install right front axle shaft.

AR33.30-P-0620MSA

23

Install rack-and-pinion steering.

AR46.20-P-0600FR

24

Install propeller shaft onto front axle differential (1).

AR41.10-P-0070MSA

 Only install center and rear lower rear engine compartment paneling again after leak test.

25

Check front axle differential (1) for leak tightness.

26

Install center and rear lower engine compartment lining.

AR61.20-P-1105FR

 Front axle differential

Number

Designation

Model 257

BA33.30-P-1006-03G

Collar bolt, front axle differential to support/oil pan

Nm

65

 Front axle differential

Number

Designation

Model 257

BA33.30-P-1007-03G

Collar bolt, front axle gear to engine support

Stage 1

Nm

5

Stage 2

Nm

50

Stage 3

°

95

 Front axle differential

Number

Designation

Model 257

BA33.30-P-1008-03G

Front axle transmission drain screw

Nm

20

 Front axle differential

Number

Designation

Model 257

BA33.30-P-1011-03G

Collar bolt, support to oil pan

Nm

60

 Front axle differential

Number

Designation

Model 257

BA33.30-P-1014-03G

Front axle transmission filling screw

M24

Nm

25

 Front axle gear

Number

Designation

Model 257

BF33.30-P-1001-03F

Hypoid gear oil

Filling capacity

Liter

0,55

Universal hypoid gear oil

BB00.40-P-0235-07A

Overview of axle gear oils

BB00.40-P-0231-01A

Axle gear oils

BB00.40-P-0239-72A

Repair materials

Number

Designation

Order number

BR00.45-Z-1046-04A

Loctite 7063 (400 ml) cleaning spray

A 001 986 71 71 09

BR00.45-Z-1110-02A

Quick-acting adhesive Omnifit 100H (50 g)

A 002 989 23 71