31 11 506 Lowering/Raising Front Axle Carrier (Universal Lifter)

31 11 506 Lowering/raising front axle carrier (universal lifter)

Special tools required:
^ 00 2 030
^ 31 4 170
^ 31 5 250
^ 31 5 255
^ 31 5 256

Warning!
Danger to life!
Mount securing fixture for vehicle on lifting platform to prevent the vehicle from slipping off or tilting down.
Secure engine in installation position to prevent it from falling down.

Necessary preliminary tasks:
^ Mount securing fixture for vehicle on lifting platform
^ Secure engine in installation position
^ Remove front wheels





Important!
Use special tool to avoid preliminary damage to ball joint in upper control arm and the necessary removal of the swivel bearing.

Press plug on left and right out of spring strut dome.

Secure swivel bearing (1) on left and right with special tool 31 4 170 in installation position.

Remove underbody protection at front and rear.

Remove steering gear cover at top left and right.

Remove reinforcement plate.

Partially detach front left and right wheel arch covers (rear section) in rear area.

Remove lower control arm from spring strut holder.





Version with active steering:
Disconnect plug connection (1) and unclip line (2) from front axle carrier.





Release nuts and remove screws (1) towards bottom.

Tie up power steering gear (2).

Installation:
Replace screws and nuts.

Tightening torque:
Steering gear to front axle carrier
E70, E71
M10 (Replace screws & nuts)
Jointing torque 56 Nm
Torque angle 90°





Engage special tool 31 5 250 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.

Note:
In a profile rail pair two profile rails are connected to each by toothing.

Insert special tools 31 5 256 in telescopic supports of other profile rail pair.





Note:
The jacking points on the left side are shown.

Align special tools 31 5 255 and 31 5 256 to front axle carrier.

Support front axle carrier by operating workshop jack 00 2 030.





Release screws (1, 2).

Installation:
Check threads for damage; if necessary, repair with Heli-Coil(R) thread inserts.

Tighten down first screws (1) and then screws (2).
Tightening torque:
Front axle carrier to engine carrier
E70, E71
M14 165 Nm

Important!
Risk of damage!
Follow operations must be carried out during lowering:
^ Remove heat exchanger from front axle carrier and tie up
^ Remove stabilizer (conventional) from front axle carrier and tie back
^ Remove all hydraulic lines on front axle carrier or stabilizer retaining bracket and tie up
^ Version with active front steering: Disconnect plug connection and expose connecting line up to power steering gear

Lower front axle carrier by max. 10 cm.

After installation:
^ Perform chassis alignment check
^ Carry out steering angle sensor adjustment/adjustment for active front steering