Installing Upper Trailing Arm

→ Wear personal protective gear.

→ Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).

→ Wear personal protective gear.

→ Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).

Information 

• The entire threaded parts of the axle must be tightened in vehicle position. Vehicle position means: vehicle standing on the wheels, or the wheel suspension is being raised with a universal vehicle lift. -Dimension X- , from → Control value: 502 mm+/-10 mm corresponds to the vehicle position. 
  Fig 1: Identifying Universal Vehicle Lift Dimension

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• Use an intermediate layer (hard rubber). Do not damage the brake cover plate. 
  Fig 2: Precaution For Lifting Wheel Suspension

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• Screws are Dacromet-coated and must not be greased. 
• Grease the toothing of the drive shaft slightly with aluminium paste Optimoly TA. 
• Do not leave drive shafts hanging from the joint stop. Support wheel carriers. 
• Use new screws and fastening nuts. 
• Make sure the bevel pinions from the ball joints are clean. Clean with a lint-free cloth as necessary. Do not use cleaning agent. 
• Observe correct tightening torques. → Tightening torques for front axle 

1. Install HBA sensor and tighten at tightening torque. → WM 4000TW TIGHTENING TORQUES FOR FRONT AXLE  .
2. Insert upper trailing arm and fastening bolts. Fit lock nuts and tighten to specified tightening torque. → WM 4000TW TIGHTENING TORQUES FOR FRONT AXLE 
3. Install spring strut → Installing Front Spring Strut  .
4. Insert wheel carrier in the ball joint, fit lock nuts, and tighten to specified tightening torque. → WM 4000TW TIGHTENING TORQUES FOR FRONT AXLE 
5. Attach HBA connector.
6. Tighten plastic nuts -arrow-  on front wheel housing liner.
   Fig 3: Locating Front Wheel Housing Liner Plastic Nuts

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