Hummer H1 Service Manual page 404

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Wheel And Tire Assembly Runout Inspection
NOTE: Before measuring the runout of a tire and wheel as-
sembly, drive the vehicle long enough to warm up the tires.
Then do the following:
1. Install tire and wheel assembly on wheel balancer.
2. Check GG rings to be sure tire bead is properly seated.
3. Position a dial indicator with a magnetic base and a roller
tip on the balancer so the different runout checks can be
done (Figure 6-35).
4. NEVER start the wheel balancer with the dial indicator in
place. The checks should be done by slowly rotating the
tire BY HAND ONLY on the tire balancer.
5. Slowly rotate the assembly one complete turn and zero the
dial indicator on the low spot.
6. Rotate the assembly one more complete turn and note the
amount of total runout.
NOTE: In order to measure radial runout, it will be necessary
to tape the center tread of the tire (Figure 6-35). Otherwise, the
dial indicator stylus will catch in the tread lugs.
7. Measure at points 1 and 2 (Figure 6-35). The maximum
allowable lateral and radial runout is 0.120 inch and 0.210
inch, respectively.
TAPE
STRIP
1
4
3
1. Tire Lateral Runout Checkpoints
2. Tire Radial Runout Checkpoint
3. Wheel Radial Runout Checkpoints
4. Wheel Lateral Runout Checkpoints
Figure 6-35: Wheel and Tire Runout Checkpoints
Geared Hub Spindle and Stud Runout
When wheel and tire runout occurs on the vehicle but not in
off-vehicle inspecting, the geared hub spindle and spindle studs
should be checked for radial and lateral runout (Figure 6-36).
05745159
Wheels and Tires/Central Tire Inflation System (CTIS)
DIAL INDICATOR
2
1
4
3
GEARED HUB
Figure 6-36: Geared Hub Spindle Runout Inspection
Geared Hub Spindle Runout Inspection
Using a dial indicator, position the roller tip on the machined
surface outside the bolts on the spindle face.
Measure the runout using the following method:
1. Turn the spindle by hand to locate the low spot.
2. Zero the dial indicator.
3. Turn the spindle by hand to check the total lateral runout.
4. 0.005 inch is the acceptable lateral runout.
Measuring Geared Hub Spindle Stud Runout
Position the dial indicator roller to contact the wheel mounting
studs. Ensure that the studs are fully pressed in, if not seat or
replace the studs as necessary (Figure 6-37).
Measure the runout using the following method:
1. Turn the spindle by hand to register on each of the studs.
2. Zero the dial indicator on the lowest stud.
3. Check the total runout on the remaining studs.
4. 0.030 inch is the acceptable radial runout.
Figure 6-37: Geared Hub Spindle Stud Runout
Inspection
6-21
SPINDLE
DIAL
INDICATOR
GEARED HUB
STUD
SPINDLE