33 31 503 Lowering/Raising Rear Axle Support

33 31 503 Lowering/Raising Rear Axle Support

Special tools required:







IMPORTANT:
Before lowering rear axle support:
Observe safety information for raising the vehicle
In order to avoid damage to vehicle hoist, perform weight compensation on vehicle.
Load luggage compartment with sand bags.







Necessary preliminary tasks:
- Expose cable pull for the emergency release up to the rear axle support. (F07)
- Deactivate and drain air spring/suspension system
- Remove rear wheels.
- Remove propeller shaft on the rear axle.
- Remove cross reinforcement.
- Remove shock absorber at the swinging arm.
- Unlock and disconnect the plug connection at the actuator unit (EMF). (F07)
- Remove and tie up both brake callipers at the wheel carrier.
- Unclip cables for pulse sensor and brake pad wear sensor from the brackets.
- Unlock and disconnect plug connection at both ride height sensors.







Engage special tool 31 5 251 with a 2nd person helping completely on workshop jack 00 2 030.
Insert special tools 31 5 255 in telescopic supports of a profile rail pair.
Insert special tools 31 5 253 in telescopic supports of other profile rail pair.

NOTE: In a profile rail pair, two profile rails are connected to one another by gearing.







The jacking points on the left side are shown.

Align special tool 31 5 255 to open the rear axle support.
Align special tool 31 5 253 to cross-member arms on rear axle support.
Support rear axle support by operating workshop jack 00 2 030.

IMPORTANT:
The centre of gravity of the rear axle must be positioned centrally over the workshop jack.
Use tensioning strap 33 5 206 to lash rear axle support to special tool 31 5 251.







Release screws (4).
Tightening torque 33 33 1AZ.

Installation note:
Arrow (1) on stop plate (2) must point in direction of travel.

Remove front tension struts (3) and carefully lower rear axle carrier.







After installation:
- Activate and fill air spring system
- Adjust parking brake (only F07).