Wheel Bearing At Standard Vehicle Height, Lifting Vehicles With Air Suspension
Special tools and workshop equipment required
- Engine and Gearbox Jack:VAS6931
- Tensioning Strap:T10038
- Engine/Gearbox Jack Adapter - Wheel Hub Support:T10149
All chassis component bolts with bonded rubber bushings must be tightened at standard vehicle height. Refer to STANDARD VEHICLE HEIGHT FOR AXLE ALIGNMENT ON VEHICLES WITH AIR SUSPENSION, CHECKING .
- Bonded rubber bushings have a limited range of rotation. Axle components with bonded rubber bushings must be brought into the position they will be in when driving before they are tightened (standard vehicle height).
- Otherwise, the bonded rubber bushing will have tension, which will reduce the service life.
- By raising the corresponding suspension using the :VAS6931 and :T10149 , this position can be simulated on the hoist.
Procedure
-- Before starting the procedure, determine the measurement -a-, for example using a tape measure, from the center of the wheel to the lower edge of the fender/wheel housing.
The dimension -a- = the standard vehicle height is dependent on the suspension installed. Refer to STANDARD VEHICLE HEIGHT FOR AXLE ALIGNMENT ON VEHICLES WITH AIR SUSPENSION, CHECKING .
The measurement must take place at standard vehicle height. Refer to WHEEL BEARING AT STANDARD VEHICLE HEIGHT, LIFTING VEHICLES WITH AIR SUSPENSION .
-- Note the measurement. This will be needed when tightening the bolts/nuts.
Risk of accident due to the vehicle sliding off the hoist.
- When lifting the vehicle on the hoist, the spring force of the air suspension remains in full effect. To bring the wheel bearing to the standard vehicle height, the spring force of the air suspension must be completely removed by bleeding the system.
- Before the respective suspension is lifted, the vehicle must be tied down to the hoist lifting arms with the :T10038 .
-- Remove the air suspension system. Refer to AIR SUSPENSION SYSTEM, FILLING AND BLEEDING .
-- Remove the front wheel. Refer to WHEELS AND TIRES .
-- Turn the wheel hub, until a wheel bolt hole is at the top.
Risk of destroying the wheel bearing when installing the wheel bolt.
- So that the installed wheel bolt cannot push against the wheel bearing, it must be installed with a washer inserted in between.
-- Install the :T10149 with a wheel bolt -2- and inserted washer -1- on the wheel hub.
Tightening of the applicable bolts/nuts must only occur if the dimension between the center of the wheel hub and the lower edge of the fender/wheel housing that was measured before starting the procedure has been attained.
-- Insert the :T10149 in the :VAS6931 and lift the wheel bearing housing until the dimension -a- is reached.
Risk of accident!
- Do not lift or lower the vehicle when the :VAS6931 is under the vehicle.
- Do not leave the :VAS6931 under the vehicle any longer than necessary.
-- Tighten the applicable bolts and nuts.
-- Lower the wheel bearing housing.
-- Move the :VAS6931 to the side
-- Remove the :T10149 .
The vehicle may be removed from the vehicle hoist only after the air springs have been filled again.
Before filling the air spring, check the installation position. Refer to Fig 4.