Remove/install rear axle semi-trailing arm

AR35.25-S-2200EF

Remove/install rear axle semi-trailing arm

20.07.2020

Model

447 with engine 622

Model

447 with engine 780.701/702

Modification notes

15.07.2020

Method revised.

The whole document

Shown on model 447.6 with engine 622

1

Semi-trailing arm

6

Electrical wiring harness

X62/21

Left rear rpm sensor electrical connector

2

Bolts

7

Screw

X62/22

Right rear rpm sensor electrical connector

3

Brake cable

8

Bolts

Shown on model 447.6 with engine 622

1

Semi-trailing arm

3

Brake cables

4

Cable slack adjuster

9

Cam bolt

10

Collar bolt

 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

 Danger

Risk of accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first time after repair work.

Before starting the engine, actuate brake pedal several times until pressure is built up and maintained in the brake system.

AS42.50-Z-0002-01A

Topical note

Notes on air suspension

Model 447 with engine 780.702
with code CA4 (AIRMATIC)

AH32.22-N-1000-01E

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

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

AH00.00-P-0020-01A

 

Remove/install

1

Connect vehicle diagnosis system and move parking brake into assembly position.

Model 447.8 with engine 780.702



AD00.00-S-2000-04E

 To do so, follow the procedure in the menu "Electric parking brake (EFB) control unit".

 Installation: Remove vehicle diagnosis system.

2

Remove respective rear wheel.

AR40.10-S-1100E

3

Remove bolts (2) .

 Bolt, rear floating caliper carrier to semi-trailing arm

*BA42.10-N-1003-12J

4

Unhook brake hose and remove brake caliper support with brake caliper and strap down.

 Do not detach brake hose.

5.1

Remove rear brake cable of parking brake.

Model 447.8 with engine 780.702

AR42.20-S-0525E

 Do not remove brake shoes of parking brake.

5.2

Detach brake cable (3).

Model 447 with engine 622
Model 447 with engine 780.701

AR42.20-S-0525EF

 Do not remove brake shoes of parking brake. Remove brake cable (3) from cable slack adjuster (4), underbody and semi-trailing arm (1).

6

Pull brake cable (3) out of crossmember on underbody.

Model 447 with engine 622
Model 447 with engine 780.701

7.1

Remove torsion bar linkage of level sensor from semi-trailing arm (1).

Model 447 with engine 622
with code LG2 (LED Intelligent Light System)
Model 447 with engine 780.701/702
with code LG2 (LED Intelligent Light System)
If the left semi-trailing arm (1) is removed.

 To do so, unclip torsion bar linkage.

 Installation: The torsion bar linkage must audibly engage on ball head on semi-trailing arm (1).

7.2

Remove torsion bar linkage of air suspension level sensor from respective semi-trailing arm (1).

Model 447 with engine 780.702
with code CA4 (AIRMATIC)

 To do so, unclip torsion bar linkage.

 Installation: The torsion bar linkage must audibly engage on ball head on semi-trailing arm (1).

8

Disconnect electrical connector for left rear rpm sensor (X62/21) or electrical connector for right rear rpm sensor (X62/22).

9.1

Remove rear axle spring.

Model 447 with engine 622, 780.701
Model 447 with engine 780.702
except code CA4 (AIRMATIC)

AR32.20-S-0230E

9.2

Remove air suspension bellows on rear axle.

Model 447 with engine 780.702
with code CA4 (AIRMATIC)

AR32.22-S-2016E

 Only detach air suspension bellows downward from semi-trailing arm (1).

10

Support semi-trailing arm (1).



000 588 11 62 00 Major assembly mount

WS01.00-P-0092B



000 588 10 62 00 Support plate

WS26.00-P-3309B

11

Remove rear shock absorber from semi-trailing arm (1).

AR32.25-S-0110E

 Do not completely remove rear shock absorber.

12

Remove trims of semi-trailing arm (1) in area of cam bolt (9) and collar bolt (10).

If installed.

AR35.25-S-2200-01E

13

Remove cam bolt (9) and collar bolt (10).

 Installation: Replace cam bolt (9), collar bolt (10) and nuts, and tighten lightly by hand. The cam bolt (9) and collar bolt (10) are only tightened to torque and tightening angle during wheel alignment measurement.

14

Remove semi-trailing arm (1) with steering knuckle.

15

Remove brake cable (3) from semi-trailing arm (1).

Model 447 with engine 780.701
Model 447.6/7 with engine 622
When replacing the semi-trailing arm (1).

16

Remove electrical wiring harness (6) from semi-trailing arm (1).

When replacing the semi-trailing arm (1).

17

Remove wheel carrier from semi-trailing arm (1).

When replacing the semi-trailing arm (1).

 To do so, remove bolts (7, 8).

 Installation: Replace bolts (7, 8) and nuts.

 Screw/nut, wheel carrier to semi-trailing arm

*BA35.15-N-1005-03H

18

Remove trim from semi-trailing arm (1).

When replacing the semi-trailing arm (1).

AR35.25-S-2200-01E



Check

19

Check elastomer bearings of semi-trailing arm (1) for wear and damage.

If wear or damage is present



Install new semi-trailing arm (1).

20

Install in the reverse order.



Check

21

Check for correct function of parking brake.



Brake test

AP42.00-S-4290E

If parking brake function is incorrect:



Adjust parking brake.

Model 447.8 with engine 780.702

AR42.20-S-0540E

Model 447.6/7 with engine 622, 780.701

AR42.20-S-0540EA



Measure

22

Perform chassis alignment.

AR40.20-S-0200E

 Control arm

Number

Designation

Model 447, 448

BA35.15-N-1005-03H

Screw/nut, wheel carrier to semi-trailing arm

Stage 1

Nm

150

Stage 2

°

90

 Rear axle brake caliper

Number

Designation

Model 447, 448

BA42.10-N-1003-12J

Bolt, rear floating caliper carrier to semi-trailing arm

M14x1.5

Nm

172