Wheels/Tires - Steering Wheel Vibrations Between 70-80MPH

Steering wheel vibrations in vehicle speed range between 70-80MPH

Topic number LI40.10-N-048693

Version 1

Design group 40.10 Wheels, tires

Date 01-26-2010

Validity Model 906

Reason for change

Reason for block

Complaint:
Steering wheel vibrations in specified vehicle speed range. Vehicle vibrations can also be felt.

Cause:
Radial force variations and/or imbalance in the front wheels are transferred to the steering wheel/vehicle in the form of vibrations.

Note:
Tires not recommended by Mercedes-Benz can aggravate this problem.

Remedy:
The complaint must be reproduced by means of a test drive.
If it is not possible to reproduce the complaint, contact the customer. Otherwise, process the following points one after
the other.

1) Check wheels for damage and tire inflation pressure. Replace any damaged, unusable wheels. Correct the tire inflation pressure. Perform a test drive if the deviations are greater than 0.5 bar.

2) Check radial force variation (RFV) of the front wheels on a suitable balance machine. Match mount the wheels/tires if necessary.

3) Balance wheels on wheel balancing machine.

4) Mount the wheels. Ensure that they are seated centrally and tighten the wheel studs/wheel nuts finger-tight in a crosswise pattern, then tighten to the required tightening torque.

5) Perform test drive. If the problem is still present, continue with step 6).

6) Install the specified steering shaft and perform a test drive.

7) Check whether the specified steering gear is installed, replace if necessary.





NOTE:
If replacing steering gear A9064600400 with A9064600800, you must also install new high-pressure hoses.
Refer to EPC for applicable part number as of chassis S245835.

8) Perform test drive. If the complaint is still present, contact the TAC.