Checking Rear Axle Caster

NOTE: Use of electronic inclination measuring instrument (CM-9606) must is required to measure rear axle caster.

NOTE: Supporting joint locking inner slotted nut must be replaced once removed (one time use only).

NOTE: The suspension component control arm may also be referred to as wishbone (upper or lower wishbone).

NOTE: During procedures number(s) and letter(s) in parentheses correspond to number(s) and letter(s) inside the illustration(s). The word arrow(s) in parentheses is used to point out specific components or movement.

Mount adapter plate (086c) for electronic instrument (CM-9606) onto supporting joint and fix into position with knurl screw (arrow). See Fig 1 .

NOTE: If a repair supporting joint is installed in the wheel carrier, unscrew locking inner slotted nut using a claw-type wrench. See Figure under SPECIAL TOOLS. Mount the adapter plate (086c) for electronic instrument (CM-9606) on the supporting joint.

Mount measuring sensor (086a) on adapter plate (086c). Ensure cable connected to sensor (086a) is pointed in direction of travel. See Fig 2 .
Compare caster actual value with specified values. For alignment specifications and values, see WHEEL ALIGNMENT SPECIFICATIONS . Return to step 5 under CHECKING CAMBER & CASTER.

Fig 1: Identifying Rear Axle Placement Of Adapter Plate (086c)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Rear Axle Placement Of Measuring Sensor (086a)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.