Front Suspension

Installing caster eccentric

Includes: Replacing standard control arm by a service control arm with caster eccentric.

Note The caster is not adjustable on standard vehicles. A caster eccentric can be retrofitted in the case of after sales service if necessary*.

The standard control arm must be replaced by an adjustable control arm (service control arm) for this purpose.
The installation of only one service control arm is permissible.

The service control arm is delivered with a caster adjusting facility (as a set).
Refer to the Parts Catalogue for the spare part No.

The set consists of a special screw (A), two eccentrics (B) and the fastening nut (C). Only the fastening nut (C) is available as a single part.

Differences compared with the standard control arm

In order to realize caster adjustment, the service control arm is provided with a special bearing at the connecting point to the diagonal arm.





This special bearing has a larger bore compared with the standard control arm (dimension X).
There are also corresponding bearing surfaces for the two eccentrics.

Requirement: In the case of caster values lying outside the tolerance or excessive caster difference between the right and left sides, in combination with a complaint about the handling. Prerequisite for installation: wheel suspension parts and body mounting points are in order. The caster eccentric must never be used to compensate for incorrect caster values resulting from deformed parts.

Installing caster eccentric
Replace standard control arm by the service control arm.
Use special tool 9560 to press it off the ball joint. Refer to Front Spring Strut, Removing and Installing.





When installing the control arm, make sure that the control arm fastening screw (e) is tightened only in vehicle position.
Vehicle position means: Vehicle must be standing on its wheels, or the wheel suspension is lifted with a universal lift until the markings (arrow) line up.
Observe tightening torque values.

Adjusting caster





With the fastening nut (C) loosened, adjust the caster by turning the special screw (A).
Adjusting values and suspension alignment.
Tighten fastening nut (C) to 160 Nm (118 ft. lbs.).