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

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

Special tools required:





Important!
Before lowering front axle support:
Observe safety information on raising the vehicle.
In order to avoid damage to vehicle hoist, perform weight compensation on vehicle.
Load spring strut domes with sand bags.





Warning!
Secure engine in installation position with special tool to prevent it from falling down.





Important!
N57: Risk of shorting the starter motor!





Necessary preliminary work:
^ Secure engine in installation position
^ Remove front wheels
^ Remove underbody protection at front and rear.
^ F03 only: Remove underbody protection
^ Remove steering box cover at top left and right.
^ Remove anti-roll bar link from anti-roll bar
^ Partly detach front left and right wheel arch covers (rear section) in rear area.
^ Remove steering shaft from steering box
^ Remove hydraulic lines from valve block (only on version with Dynamic Drive)
^ Disconnect plug connection and expose connecting line up to hydraulic steering gear (only on version with active front steering)





Release screws (1).

Remove front left/right wheel arch cover (2) from bumper trim.

Installation note:
Make sure wheel arch cover is correctly positioned.





Release screws (1).

Remove brake air duct (2).





Graphic shows: F01, F02

Release screws (1).

Release deformation element (3) from front axle support (2).





only: F01, F02

Release bolt (1) and remove holder (2) from oil line





Secure swivel bearing (1) with special tool 33 5 206 on spring strut.





Release nut (1) and remove screw.

Remove spring strut from wishbone (2).

Tightening torque 31 12 7AZ.





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.

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

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





Note:
The jacking points (1) on the left side are shown.





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

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





Important!
Pay attention to hydraulic steering hoses and lines when lowering and raising. Hoses/lines must not be kinked/tensioned/bent!





Release screws (1, 2).

Tightening torque 31 10 1AZ.

Installation note:
Check threads for damage; if necessary, repair with Helicoil thread inserts.

(1) = M12x1.5x65 screw

(2) = M12x1.5x95 screw

Tighten down first screws (1) and then screws (2).





Important!
Risk of damage!

Lower front axle support by max. 10 cm.





After installation:
^ Fill and bleed hydraulic system
^ Check line connections for leaks
^ DYNAMIC DRIVE start-up

.°P: