Remove/install steered additional axle

AR35.50-W-0013B

Remove/install steered additional axle

25.06.2020

Rear axle

749.112 in model 963

with code A4X (Trailing axle, 7.5 t, steered, de-loadable)

Rear axle

749.112 in model 963

with code A4Y (Trailing axle, 7.5 t, steered, de-loadable, liftable)

Shown with code (A4Y) Steered, load-relievable, liftable trailing axle (7.5 t)

1

Brake wear sensor

5

Screw

9

Stabilizer link

2

Air bellows support

6

Torsion bar

10

Bearing cap

3

Bearing bracket

7

Screw

11

Screw

4

Jack

8

Nut

Topical note

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

AH00.00-P-0020-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A

 

Remove/install

1

Secure vehicle to prevent it moving away.

2

Empty compressed-air system completely.

3

Remove wheels from trailing axle.

AR40.10-W-1100H

 After jacking up, leave the lifting device positioned at the trailing axle.

4

Support vehicle at frame.

5

Remove left and right anti-lock braking system (ABS) rpm sensor.

AR42.30-W-0140H

6

Disconnect connector couplings from brakepad wear sensor (1).


Detach and attach the connector in an axial direction only.
The electrical connectors can otherwise be damaged and the brake caliper must be replaced.

7

Remove compressed-air lines from left and right combination brake cylinder.

AR42.10-W-0900H

 "VOSS 232" compressed-air connector

8

Remove all lines and line brackets attached to the trailing axle and tie up to one side.

9

Remove both bearing caps (10) from air suspension supports (2) and press stabilizer link (9) downward out of mount.

 Depending on the vehicle equipment and space available, it may be necessary to remove the stabilizer link (9) completely.

 Bearing cap of stabilizer link to air suspension bellows carrier

*BA32.35-N-1001-03L

 Stabilizer link to vehicle frame bearing bracket

*BA32.35-N-1002-03L

10

Remove torsion bar (6) with bearing bracket (3) at left and right.

 Torsion bar with bearing bracket at leading axle/trailing axle

*BA32.35-N-1012-03L

11

Remove steering cylinder from steering control arm and from trailing axle and strap down to one side.

 Nut, steering cylinder ball joint to steering knuckle arm

*BA46.80-N-1003-02A

 Nut, ball joint for steering cylinder to bearing bracket

*BA46.80-N-1002-02A

 Puller

*625589003500

12

Remove air suspension support (2) from trailing axle.

 Air suspension bellows carrier to trailing axle

*BA32.22-N-1004-03I

 Socket wrench bit

*963589000900

13

Lower additional axle and pull out from under vehicle.

 Remove the bushes (4).

14

Install in the reverse order.

 Air suspension

Number

Designation

Model 963, 964

BA32.22-N-1004-03I

Air suspension bellows carrier to trailing axle

Stage 1

Nm

400

Stage 2

°

180

 Rear axle stabilizer bar

Number

Designation

Model 963, 964

BA32.35-N-1001-03L

Bearing cap of stabilizer link to air suspension bellows carrier

Stage 1

Nm

460

Stage 2

°

120

 Rear axle stabilizer bar

Number

Designation

Model 963, 964

BA32.35-N-1002-03L

Stabilizer link to vehicle frame bearing bracket

Stage 1

Nm

225

Stage 2

°

90

 Rear axle stabilizer bar

Number

Designation

Model 963, 964

BA32.35-N-1012-03L

Torsion bar with bearing bracket at leading axle/trailing axle

Nm

330

 Auxiliary steering

Number

Designation

Model 963, 964 with code A4B, A4Q, A4R, A4T, A4U, A4X, A4Y

BA46.80-N-1002-02A

Nut, ball joint for steering cylinder to bearing bracket

Nm

340

 Auxiliary steering

Number

Designation

Model 963, 964 with code A4B, A4Q, A4R, A4T, A4U, A4X, A4Y

BA46.80-N-1003-02A

Nut, steering cylinder ball joint to steering knuckle arm

Nm

340