MAHLE RTI Laser 4 - Manual (Page 11)

Page 10
CASTER READING (LASER 4)
Proceed with the following steps to read Caster:
1) With the Spirit Level Gauge mounted on the left front
wheel clamp, turn the left front wheel outward at
the front for a 20 degree reading on the radius
gauge. (See Fig. 19)
2) Turn the Spirit Level Gauge so it is level.
3) Adjust the Caster bubble to zero with the adjusting
knob on the bottom of the gauge.
4) Turn the wheel inward at the front for a 20 degree
reading on the radius gauge. This is a total swing
of 40 degrees. (See Fig. 20)
5) Turn the Spirit Level Gauge so it is level.
6) Read Caster at the center of the bubble on the
Caster Scale. The spirit level for Caster is located
on the left side of the gauge. See the figure to the
right. (See Fig. 21)
Caster is zero when the center of the bubble is on zero
of the scale.
Caster is positive when the bubble is away from
zero, away from the wheel.
Caster is negative when the bubble is away from
zero, towards the wheel.
7) Repeat the above procedure on the right front wheel.