Remove/install front axle shafts

AR33.30-P-0620RT

Remove/install front axle shafts

13.02.2019

Model

251

with 4MATIC

Modification notes

02.02.2011

"Final torque at K0 design level" added

Operation step 8

Shown on vehicle with AIRMATIC (air suspension with level adjustment and adaptive damping system ADS), code 489

1

Collar nut

2

Bracket

3

Bracket

4

Cable tie

5

Brake hose

6

Bracket

Shown on vehicle with AIRMATIC (air suspension with level adjustment and adaptive damping system ADS), code 489

7

Extraction and insertion tool

Shown on vehicle with AIRMATIC (air suspension with level adjustment and adaptive damping system ADS), code 489

8

Nut

9

Nut

10

Steering knuckle

Shown on vehicle with AIRMATIC (air suspension with level adjustment and adaptive damping system ADS), code 489

11

Nut

12

Transverse control arm

13

Front axle shaft

 

Remove/install

 Warning

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating area of mechanical components when moving components.

AS00.00-Z-0009-01A

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

Topical note

Notes on installing brake hoses

AH42.10-P-9406-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

1

When working on the front-end assembly, be careful not to scratch, mark or notch the surfaces of aluminum parts. Otherwise the service life of the parts will be affected

2

Lift/jack up vehicle

AR00.60-P-1000RT

3

Deflate AIRmatic system using STAR DIAGNOSIS



AD00.00-P-2000-04A

 Only on vehicles with Airmatic (air suspension with level adjustment and adaptive damping system ADS), code 489.

4

Remove front wheels



AP40.10-P-4050RT

5

Unscrew collar nut (1) from front axle shaft

 Collar nut, front axle shaft to front axle shaft flange

*BA33.30-P-1001-02E

6

Unscrew nut (8) and detach tie rod from steering knuckle (10)

 Self-locking nut, tie rod to steering knuckle

*BA46.40-P-1002-01L

 Thrust piece

*140589006300

 Puller

*140589093300

7

Unscrew nut (9) and detach steering knuckle (10) from upper transverse control arm

 Secure steering knuckle (10) with cable tie.

 Self-locking nut, upper ball joint out of upper transverse control arm to steering knuckle

*BA33.20-P-1001-01L

 Thrust piece

*140589006300

 Puller

*140589093300

8

Release front axle shaft from front axle shaft flange with extraction and insertion tool (7)

 Extraction and insertion tool

*210589034300

9

Unscrew nut (11) and detach front shock absorber from transverse control arm (12)

 Installation:
Final torque when vehicle is on measuring platform or at K0 design level.
In order to prevent placing rubber bushing under stress.

 Support transverse control arm (12) with transmission jack

 Self-locking nut, shock absorber to wishbone

*BA32.25-P-1002-01H

10

Remove electrical lines from brackets (2, 3)

 Do not damage electrical leads.

11

Unclip brake hose (5) from bracket (6)

 Do not damage the brake hose (5).

12

Remove cable tie (4) from steering knuckle (10)

 Installation: Pay attention to installation position.

 Installation: Replace cable tie (4).

 Pliers

*164589013700

13

Pull front axle shaft (13) out of front axle differential (arrow)

 Swivel steering knuckle (10) out of working area.

 Collect any oil which runs out.

14

Install in the reverse order

15

Fill AIRmatic system using STAR DIAGNOSIS


The wheels must not be in contact with the ground during the filling.
Since the air suspension bellows in the spring element is destroyed when filling in deflected condition.

 Only on vehicles with AIRmatic (air suspension with level adjustment and Adaptive Damping System (ADS)), code 489
STAR DIAGNOSIS diagnosis system

 Front axle shock absorber

Number

Designation

Model 251

BA32.25-P-1002-01H

Self-locking nut, shock absorber to wishbone

Nm

265

 Wheel control, hub

Number

Designation

Model 251

BA33.20-P-1001-01L

Self-locking nut, upper ball joint out of upper transverse control arm to steering knuckle

Stage 1

Nm

20

Stage 2

°

90

 Front axle shaft

Number

Designation

Model 251

BA33.30-P-1001-02E

Collar nut, front axle shaft to front axle shaft flange

Stage 1

Nm

250

Stage 2

°

45

 Tie rod

Number

Designation

Model 251

BA46.40-P-1002-01L

Self-locking nut, tie rod to steering knuckle

Stage 1

Nm

45

Stage 2

°

90