Hummer H1 Service Manual page 403

6-20 Wheels and Tires/Central Tire Inflation System (CTIS)
TROUBLESHOOTING A NON-BALANCING
WHEEL AND TIRE ASSEMBLY
NOTE: If a wheel and tire assembly cannot be balanced, or
balance cannot be maintained, any of the following conditions
may be causing the problem:
• Runflat movement on the wheel rim.
• Excessive radial or lateral runout condition of the wheel.
• Improper seating of tire bead on the wheel flange.
NOTE: Perform the following if the runflat is moving on the
wheel. If an excessive runout condition is suspected, proceed to
Wheel Runout and Wheel and Tire Assembly Runout Inspection.
Suspected Runflat Movement Procedure
1. Disassemble wheel and remove runflat from tire.
2. Clean inside of tire, wheel, and O-ring seal with soap and
water. Allow cleaned parts to dry prior to assembly.
3. Apply runflat gel lubricant at crown area on inside tire
area.
4. Install runflat into tire and assemble wheel.
5. Balance wheel and tire assembly.
WHEEL RUNOUT INSPECTION
NOTE: It is suggested that the lateral runout check be done
first, as excessive lateral runout can affect radial runout.
1. Clean dirt, debris, or rust from wheel.
2. Take measurements from inboard and outboard rim
flanges for radial and lateral runout.
CAUTION: Never start the wheel balancer with the dial indi-
cator in place. The checks should be done by slowly rotating
the wheel BY HAND ONLY.
3. With wheel or wheel and tire assembly on wheel balancer,
place magnetic base roller tip dial indicator in position.
4. Slowly rotate the wheel one revolution and zero the dial
indicator.
5. Rotate the assembly one more complete turn and record
the indicator reading (Figure 6-33).
6. If measurement for lateral runout exceeds 0.060 inch
(1.52 mm), replace the wheel.
7. If measurement for radial runout exceeds 0.060 inch (1.52
mm), replace the wheel.
4-1-00
INBOARD
SIDE
Figure 6-33: Wheel Runout Inspection Points
8. Assemble and balance wheel and tire assembly (Figure 6-32).
Every time a wheel and tire is assembled, it should be
balanced.
NOTE: An improperly seated tire will cause runout. Inspect
GG rings to be sure bead is properly seated.
9. Be sure that the tire is properly mounted and seated on the
wheel. Check the distance between the GG rings on the
tire and the wheel flange. The distance between the GG
rings and the wheel flange should be the same (concentric)
all the way around the tire (Figure 6-34).
10. Verify that GG rings are not recessed below the wheel
flange at any point around the wheel.
11. If the GG rings are non-concentric with, or are recessed
below the wheel flange, remove the tire from the wheel
and reinstall.
12. Balance wheel and tire assembly.
GG RING
TIRE BEAD
PROPERLY SEATED
Figure 6-34: Checking Tire Bead Seating
_______________
OUTBOARD
SIDE
CHECK
LATERAL
RUNOUT
HERE
CHECK
RADIAL
RIM
RUNOUT
HERE
RIM FLANGE
GG RINGS
RIM
GG RING
TIRE BEAD
NOT SEATED
®