6.
Zero both radius scales.
7.
Apply the brakes when using a full-floating turning gauge, but if a semi-floating
type is used, leave them released.
8.
Install the wheel clamp to
the wheel rim, as shown in
Figure 9-22
, and the
camber/caster gauge to
the wheel clamp. On
smaller wheels, the
camber/caster gauge is
usually fitted directly to the
wheel hub instead of the
wheel rim. Follow the
equipment OEM's
instructions.
9.
To check and adjust wheel
runout, first make sure that
the wheel clamp fingers
rest firmly against the rim
and that the gauge rests
firmly against its seat, as
shown in
Figure 9-22.
10.
Raise the front wheel off
the turning radius gauge.
11.
Note the reading on the
camber scale.
Figure 9-22 - The camber/caster gauge
attached to the wheel clamp.
12.
When turning the wheel, note the point of the greatest wheel runout and mark the
tire in that location. Next, position this location in the forward or rearward
direction. In this way, the true wheel centerline is brought into the vertical
position, splitting the runout.
13.
Lower the front end so that the tires sit again on the turning radius gauges.
Some camber/caster gauges have a runout compensation adjustment. Follow the OEM
procedure when using this equipment.
Measure caster.
To measure caster using radius gauges, use the following procedure:
1.
Set both turning radius scales at zero.
2.
Make a right-hand turn with the steering wheel so that the front wheel is turned to
20 degrees.
3.
Turn the adjusting screw to center the left wheel caster gauge bubble.
4.
Now turn the steering wheel to the left until the front wheel is at the 20-degree,
left-hand turn position.
5.
Rotate the gauge to level it.
6.
Visually align the center of the bubble with the left- or right-hand caster
graduation and read the degree of caster. The caster is positive if the bubble is
toward the positive sign and negative if the bubble is toward the negative sign.
7.
Repeat this procedure on the opposite side of the vehicle.
NAVEDTRA 14050A
9-28