Disassembling and Assembling Front Spring Strut

Disassembling and assembling front spring strut











Tools

Disassembly and assembly instructions
Disassembly





- Tension the coil spring with the spring clamp until the piston rod is relieved.
- To undo the connection (piston rod to spring strut mount) counter at the piston rod with special tool 9630 or a 7-mm Allen key.

Important: Never use an impact bolter to loosen or tighten the fastening nut.

- Remove all parts from the piston rod.

Note!
^ When installing new parts, observe the allocation.

Preliminary work and notes on assembly
- Replace nut for fastening the piston rod on the spring strut mount.
- It is recommended to replace the coil springs only in pairs.

Note!
^ If the coil springs are exchanged, it might be necessary to use a different spring plate than before.

The following spring plates (compensation parts) are available:
Allocation of the spring plate according to the coil spring tolerance group.











- Press spring plate No. 6 (compensation part) into the assembly consisting of mount No. 5 and back-up ring No. 5a and complete with the spring strut mount No. 3.
- Fit protective bellows on additional spring.
- Observe the correct allocation (running gear version) when installing new springs and/or dampers.
- Tension coil spring with spring clamp.

Distinguishing feature of coil springs and dampers





A Identification of the running gear version (spring constant/spring length) by two different coloured lines (for example, 1 x blue and 1 x white).
B Identification of the coil spring tolerance group (load group) for determination of the compensation part (spring plate) thickness.
C Colour dot (colour label) to differentiate the damper identifier.
1 white line = 3.0 mm thick compensation part.
1 green line = 6.5 mm thick compensation part.
White dot = Standard running gear RoW/USA
Green dot = Sport-type running gear RoW/USA

Assembly





- Slide the protective tube/additional spring assembly on the piston rod. Slide the cup washer No. 7 and stop plate No. 4 as far as they will go into the correct position on the piston rod.
- Push the pretensioned coil spring onto the vibration damper so that the end of the coil spring rests against the stop of the spring plate.





- Place spring strut mount (assembly of mount/back-up ring/spring plate) onto the piston rod so that the end of the coil spring is located in the spring plate. Place stop plate in the correct position on the spring strut mount and screw a new fastening nut onto the piston rod. Make sure that the rubber part of the mount is properly seated in the recess in the spring strut mount (arrows).





- Use a socket wrench insert open on one side to tighten the fastening nut on the spring strut mount. In this way the specified tightening torque can be adhered to exactly. It is also possible to counter at the piston rod with special tool 9630 at the same time. Never use an impact bolter to tighten the fastening nut.