Replace Front Axle Spring Strut

Replace Front Axle Spring Strut






NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

REMOVAL
1. Remove front wheels
2. Install clamping plates (01b and 01c) tool No. 202 589 13 63 00 and clamping device (01a) tool No. 202 589 01 31 00, or equivalents

WARNING:
^ Risk of injury from being trapped or crushed when working on preloaded springs or spring bodies
^ Only use approved clamping devices and if appropriate also screen off the danger area
^ Check special tools for damage and function, (visual inspection)
^ Wear safety gloves
^ Do not use a impact wrench

3. Clamp front spring, refer to Coil Spring, Suspension
- Clamp spring until the wishbone is relieved of load

WARNING:
^ Risk of injury of to skin or eyes due to hydraulic fluid spraying out under high pressure
^ Risk of poisoning due to consuming hydraulic fluid
^ Before starting work on the hydraulic system, depressurize the system
^ Wear protective clothing and safety glasses

4. Empty pressure oil system at front axle
5. Remove bracket (11n) of pressure line (P4) at spring strut/piston rod
6. Unscrew nuts (11j) and remove bracket (11v)
7. Pull pressure line (P4) off spring strut/piston rod
8. Detach nut (11a) with washer and rebound stop (11b) of upper spring strut fixing
9. Disconnect leak oil line (LL/LR) from the steel line connection
10. Unclip bracket for lines from spring strut (arrows)
11. Unscrew spring strut (11) from steering knuckle (33) and remove
12. Secure steering knuckle (33) with a suitable hook (arrow) to prevent it from tilting away
- Do not tension brake hose and electric cables
13. If necessary, remove rubber mount (11c)

WARNING:
^ Risk of injury from drilling gas-filled units or components (gas fill is not inflammable)
^ Wear safety glasses and safety mask

14. Dispose of spring strut, if required, refer to Disposing Of Spring Strut

INSPECTION
1. Check bump stop (11h), retaining strap (11e), cupseal (11f) for damage and cracks
2. Check spring strut for leaks
- Slight oil mist is permissible
- If the spring strut tube is moistened with oil replace spring strut

INSTALLATION
Reverse procedures to install, noting the following information:
- Replace self-locking bolts and nuts
- Fill pressure oil system at front and rear axles
- Ensure correct routing of pressure line
- Ensure correct routing of leak oil line (LL/LR)
- Carry out front end alignment check
- Replace nut (11d)
- Replace bolts (11i) and self-locking nut (11u)
- Fit upper bolt (11k) and tighten slightly until the surface of the steering knuckle abuts the spring strut on the inside
- Tighten bolts (11i) and then tighten upper bolt (11k)
- Attach cup seal (11f) to rubber mount (11c)

SPECIFICATIONS
Self-locking:
Nuts Attaching Spring Strut To Front End: 80 Nm
Bolts Attaching Spring Strut To Steering Knuckle: 110 Nm
Nuts Clamping Connection Of Spring Strut/Steering Knuckle: 200 Nm
Nuts Attaching Spring Strut Rubber Mount To Front End: 20 Nm
Leak Oil Line (LL/LR) To The Steel Line Connection 10x1 mm: 14 Nm