Caster

DESCRIPTION
The caster is the forward or rearward tilt of the top of the front wheel spindle. If the top of the front wheel spindle tilts to the rear, caster is positive. If the top of the front wheel spindle tilts to the front, caster is negative. For correct caster angle or tilt, refer to Specifications.

PROCEDURE

NOTE: Adjusting cams are provided for caster and camber adjustment.

1. Check caster and camber and record the readings.

NOTE: A vehicle within the minimum to maximum tolerances may require alignment adjustment to the nominal setting (zero) because side-to-side setting (split) is out of specification and must be corrected.

2. Compare camber and caster readings with nominal specifications on appropriate chart (depending on vehicle) to determine if adjustment is required to bring vehicle to nominal setting.
^ Maximum caster difference between wheels (left minus right) to be within -3/4 degree to +3/4 degree with caster set to specification.
3. If adjustment is required, loosen two nuts on top of adjusting cams.
4. Turn hex cams as required to obtain desired valve.
5. After proper caster and camber settings have been set, hold each cam and tighten nuts to 148-201 Nm (109-143 ft. lbs.).
6. Check toe-in and steering wheel spoke position and adjust both (as required) at the same time.