Remove/install upper control arm

AR33.20-P-0500FR

Remove/install upper control arm

29.11.2019

Model

257

Shown on left side of vehicle except code 489 (AIRMATIC)

1

Front left level sensor retaining clamp

2

Upper transverse control arm

3

Steering knuckle

4

Nut

10

Screw

Shown on left side of vehicle

6

Cover

9

Nut

K40/8

Engine fuse and relay module

Shown on right side of vehicle

5

Cover

8

Coolant container

9

Nut

11

Cable duct

Topical note

Notes on handling, transport and storage of composite brake disks

AH42.10-P-9406-12LF

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

Notes on repair work on suspension components

AH00.00-P-0100-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

 

Remove/install

1.1

Remove cover (5).

When removing right upper transverse control arm (2).

1.2

Remove the cover (6).

When removing left upper transverse control arm (2).

2.1

Remove on-board electrical system battery.

Model 257
except code B01 (48V technology)
When removing right upper transverse control arm (2).

Model 257
with code U98 (LITHIUM-IONEN-STARTERBATTERIE (LISB))
except code B01 (48V technology)

AR54.10-P-0009FRX

Model 257
except code B01 (48V technology)
except code U98 (LITHIUM-IONEN-STARTERBATTERIE (LISB))

AR54.10-P-0009FR

2.2

Remove on-board electrical system battery for 48 V on-board electrical system.

Model 257
with code B01 (48V technology)
When removing right upper transverse control arm (2).

AR54.10-P-0022FR

3.1

Remove coolant reservoir (8) with connected lines and place to one side.

When removing right upper transverse control arm (2).

3.2

Remove engine fuse and relay module (K40/8) and place to one side with connected lines.

When removing left upper transverse control arm (2).

4

Remove front wheel.

AR40.10-P-1102A

5

Secure steering knuckle (3) against falling down.

6

Unscrew nut (4).


Counterhold the ball head and do not use an impact wrench/driver.
Otherwise the ball head or steering knuckle (3) may be damaged.

 Nut, steering knuckle to transverse control arm

*BA33.20-P-1006-01U

7

Remove upper transverse control arm (2) from steering knuckle (3).

8

Remove front suspension strut.

Model 257
with code 489 (AIR BODY CONTROL)

AR32.25-P-1017FRA

9

Remove front left level sensor retaining clamp (1) from upper transverse control arm (2).

 Pay attention to installation position.

10

Remove front right level sensor retaining clamp from upper transverse control arm (2).

Model 257
with code 489 (AIR BODY CONTROL)

11

Push cable duct (11) slightly to one side.

When removing right upper transverse control arm (2).

12

Counterhold screws (10) and unscrew nuts (9).

 Nut, transverse control arm to body

*BA33.20-P-1005-01U

13

Remove bolts (10).

14

Remove upper transverse control arm (2).



Check

15

Check elastomer bearings at upper transverse control arm (2) for wear and damage.

Evaluation of elastomer bearings

AH00.10-P-0001-01A

In the event of a problem,



Replace upper transverse control arm (2).

16

Check upper ball joint at upper transverse control arm (2) for wear and damage.

In the event of a problem,



Replace upper transverse control arm (2).

17

Check upper transverse control arm (2) for damage.

In the event of a problem,



Replace upper transverse control arm (2).

18

Install in the reverse order.

 Wheel control, hub

Number

Designation

Model 257

BA33.20-P-1005-01U

Nut, transverse control arm to body

Stage 1

Nm

35

Stage 2

°

90

 Wheel control, hub

Number

Designation

Model 257

BA33.20-P-1006-01U

Nut, steering knuckle to transverse control arm

Stage 1

Nm

50

Stage 2

°

45