Remove/install leading axle

AR35.50-W-0010B

Remove/install leading axle

28.05.2019

Rear axle

749.120 in model 963

with code A4A (Leading axle, 7.5 t, de-loadable, liftable)

Rear axle

749.121 in model 963

with code A4H (Leading axle, 4.3 t, de-loadable, liftable)

Illustration shows leading axle 749.120

1

Screw

2

Nut

3

Brake wear sensor

4

Shock absorber

5

Screw

6

Air suspension bellows

7

Screw

8

Trailing arm

9

Screw

10

Lift bellows

11

Nut

12

Vehicle frame bearing bracket

Topical note

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

AH00.00-P-0020-01A

Topical note

Special instructions for lifting and supporting vehicle

AH00.60-N-0100-01B

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 

Remove/install

1

Secure vehicle to prevent it moving away.

2

Completely empty compressed-air system.

3

Detach wheels from leading axle.

AR40.10-W-1100H

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

4

Support vehicle at frame.

5

Disconnect electrical connector from brakepad wear sensor (3) at left and right.


Pull off and push on the plugs in an axial direction only.
The electrical connectors can otherwise be damaged and the brake caliper must be replaced.

6

Remove compressed-air line from left and right brake cylinder.

AR42.10-W-0900H

 "VOSS 232" compressed-air connector

7

Detach all lines and line brackets secured to leading axle and tie up to the side.

8

Detach shock absorbers (4) from left and right leading axle air suspension support.

 Shock absorber at leading axle air suspension bellows carrier

*BA32.25-N-1007-03M

9

Detach air suspension bellows (6) from plate on leading axle at left and right.

 Nut, air suspension bellows to plate on leading axle

*BA32.22-N-1007-03I

10

Detach lift bellows (10) from leading axle at left and right.

 Bolt, lift bellows to leading axle

*BA32.22-N-1008-03I

11

Detach trailing arm (8) from vehicle frame bearing bracket (12) at left and right.

 Leading axle trailing arm to vehicle frame bearing bracket

*BA32.35-N-1011-03L

12

Lower leading axle and pull out from under vehicle.

13

Detach trailing arm (8) and air suspension support from leading axle at left and right.

Only if the leading axle is to be replaced.

 Nut, spring U-bolt to leading axle

*BA32.22-N-1010-03I

14

Install in the reverse order.

 Air suspension

Number

Designation

Model 963, 964

BA32.22-N-1007-03I

Nut, air suspension bellows to plate on leading axle

Nm

70

 Air suspension

Number

Designation

Model 963, 964

BA32.22-N-1008-03I

Bolt, lift bellows to leading axle

Nm

40

 Air suspension

Number

Designation

Model 963, 964

BA32.22-N-1010-03I

Nut, spring U-bolt to leading axle

Nm

580

 Rear axle shock absorber

Number

Designation

Model 963, 964

BA32.25-N-1007-03M

Shock absorber at leading axle air suspension bellows carrier

Nm

330

 Rear axle stabilizer bar

Number

Designation

Model 963, 964

BA32.35-N-1011-03L

Leading axle trailing arm to vehicle frame bearing bracket

Stage 1

Nm

225

Stage 2

°

90