Remove/install front axle

AR33.10-P-0100MCC

Remove/install front axle

13.2.12

 

Remove/install



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

1

Remove brake carrier (1) with mounted brake caliper (2) from front axle and hang up to one side with attached brake hose

 Do not remove brake linings. Slightly push back brake linings, if necessary using a suitable tool.

* not for USA

AR42.10-P-0500MCC

* for USA only

AR42.10-P-0500MCU

 Installation: Press brake pedal several times until the brake linings make contact with the brake disk.

2

Remove bolts (3), and pull left front rpm sensor (L6/1) and right front rpm sensor (L6/2) out of steering knuckle

3

Using a suitable tool unclip bracket (4) on left and right suspension strut, place left front rpm sensor (L6/1) and right front rpm sensor (L6/2) to one side

4

Remove underfloor panels

Rechargeable drill / screwdriver

gotis://G_58.0_01.1

5

Loosen nut (5) on steering coupling (6)

 Turn the front wheels onto lock until the nut (5) is accessible.



*BA46.10-P-1001-01F

6

Lower vehicle with vehicle lift

7

Place the front wheels in the straight-ahead position and block the steering wheel using the holding device

 Steering wheel must be locked. Otherwise the fanfare horns and airbag clock spring contact may be damaged.

 Holding device

*129589012100

8

Raise vehicle with vehicle lift

9

Unscrew nut (5) on the steering coupling (6), remove bolt (7) and slide steering coupling (6) upwards and remove from the rack-and-pinion steering (8)

 Only the bolt (7) and nut (5) approved for model 451 may be used. Bolts and nuts of other models with the same dimensions have different properties due to other surface coatings and may impair the strength of the bolted connection.

 When the nut (5) is loosened, the cam-shaped bolt (7) rotates with it approx. half a revolution. However, the bolt (7) does not have to be counterheld.

 Check the steering coupling (6) for ease of movement and replace if necessary.

10

Disconnect connector of power steering torque sensor (B23x1)

For vehicles with code (V26) Power steering, EPS (FFO)

11

Disconnect power steering connector (M19x1)

For vehicles with code (V26) Power steering, EPS (FFO)

12

Ground; disconnect interference suppression of power steering pump (W30/2)

For vehicles with code (V26) Power steering, EPS (FFO)

13

Support front axle carrier (9) with transmission jack and removal fixture and secure with tensioning strap

 Removal fixture

*450589026200

Transmission jack 0.5 t

gotis://H_00.10_01.0

14

Remove bolts (10) from front axle carrier (9)

 Installation: Screw in bolts (10) and remove transmission jack with removal fixture.

Slide front axle carrier (9) into the foremost position and align centrally in this position, then tighten bolts (10).



*BA33.10-P-1001-01D

15

Unscrew nut (14) on left and right suspension strut

 Do not turn the piston rod of the suspension strut. Otherwise the suspension strut may be damaged.

 Counterhold the piston rod of the suspension strut using a Torx bit (size T45) and a shank length of 100 mm.

If the nut (14) is seized slide back boot, fasten holding device (15) on the piston rod of the suspension strut and counterhold with open end wrench (16).



*BA32.25-P-1002-04D

Open end wrench

*450589010100

 Assembly tool set

*450589089900

 Holding device

*451589006300

16

Raise vehicle with the vehicle lift and pull front axle forward under the vehicle

 Aid of helper required.

17

Loosen tensioning strap, remove front axle from transmission jack and removal fixture

 Aid of 2 helpers required.

18

Install in the reverse order

19

Perform wheel alignment check

 Depending on the workshop equipment select between the measurement variant with recording the vehicle level or without recording the vehicle level.

without recording the vehicle level

AR40.20-P-0200MCC

with recording the vehicle level

AR40.20-P-0200MCE

Number

Designation

Model 451.3/4

BA32.25-P-1002-04D

Nut, suspension strut to rebound buffer

Nm

45

Number

Designation

Model 451.3/4 except 451.390/391/490/491

Model 451.391/491

BA33.10-P-1001-01D

Bolt, front-axle carrier to body

Nm

100

100

Number

Designation

Model 451.3/4

BA46.10-P-1001-01F

Bolt, steering coupling to rack-and-pinion steering

Nm

20