Wheels And Tires - Hummer H1 Service Manual

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Section 6 Wheels and Tires/Central Tire
Inflation System (CTIS)
Central Tire Inflation System
Air Intake Line and Assembly. . . . . . . . . . . . . . . . . . . . . . .6-51
Air Leak Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . .6-32
Air Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-40
Air Pressure Gauge Lamp. . . . . . . . . . . . . . . . . . . . . . . . . .6-41
Air Pressure Indicator Lines . . . . . . . . . . . . . . . . . . . . . . . .6-45
Air Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-44
Auxiliary Air Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-54
Compressor Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-46
Compressor Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-46
Compressor Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-36
Deflate Valve Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . .6-47
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-30
Dust Excluder Maintenance . . . . . . . . . . . . . . . . . . . . . . . .6-48
Front CTI Line Replacement . . . . . . . . . . . . . . . . . . . . . . . .6-50
Front Supply Tube and Hose . . . . . . . . . . . . . . . . . . . . . . .6-49
Geared Hub Replacement . . . . . . . . . . . . . . . . . . . . . . . . . .6-53
Inflate/Deflate and Tire Selector Switches. . . . . . . . . . . . .6-38
Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-37
Interior Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-43
Low Pressure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-42
Quick-Disconnect Valve and Tube . . . . . . . . . . . . . . . . . . .6-52
Rear CTI Line Replacement . . . . . . . . . . . . . . . . . . . . . . . .6-50
WHEEL AND TIRE ASSEMBLY REPLACEMENT
WARNING: Always take the wheel to an authorized
service center for proper servicing. Use 16.5 inch diam-
eter tires only. Mismatching tire and rim diameters is
dangerous. A mismatched tire and rim assembly may
explode and can result in serious injury or death.
WARNING: Put transmission into the PARK position,
apply parking brake, and chock opposite wheel before
removing wheel. Avoid removing any wheel when vehi-
cle is on sloping terrain. Personal injury or damage to
equipment may result. Remove only the inner group of
lug nuts when removing a wheel from the vehicle. Re-
moving the outer nuts which hold the rim together
while the assembly is inflated could result in serious in-
jury or death.
WARNING: Never mix tires of different size or tread
design. Never mix bias and radial construction tires.
Mixing tire types will adversely affect road handling
and can lead to loss of vehicle control, and could result
in serious injury or death.
05745159
TABLE OF CONTENTS
Rear Tube Connection Shield . . . . . . . . . . . . . . . . . . . . . . 6-53
Spindle Extension and Seal . . . . . . . . . . . . . . . . . . . . . . . . 6-54
Supply Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-49
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31
Tube Shield Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 6-51
Indicator Lights
Compressor/Low Pressure. . . . . . . . . . . . . . . . . . . . . . . . . 6-39
Runflat
Compressor Belt Replacement . . . . . . . . . . . . . . . . . . . . . 6-12
Steering Stop Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29

Wheels and Tires

Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Checking Wheel Alignment . . . . . . . . . . . . . . . . . . . . . . . . 6-25
One-Piece Aluminum Wheel and Two-Piece
Runflat Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-56
Tire, Two-Piece Wheel, and Runflat Replacement . . . . . . . 6-2
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Wheel Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
Wheel Alignment Correction . . . . . . . . . . . . . . . . . . . . . . . 6-26
Wheel and Tire Assembly Replacement . . . . . . . . . . . . . . 6-1
Wheel Half Stud Replacement . . . . . . . . . . . . . . . . . . . . . . 6-10
Wheel Runout Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
NOTE: Always depress both CTIS quick-disconnect valve
tabs on each axle set to prevent air loss from the other tire.
NOTE: Any procedure requiring removal of lug nuts and/or
wheel-half nuts on two-piece steel wheels will first require re-
moval of the plastic nut covers. The covers pull straight off of
the lug nuts and are removed from the wheel-half nuts by turn-
ing counterclockwise.
Removal
NOTE: On vehicles equipped with Central Tire Inflation Sys-
tem (CTIS), mark the wheel mounting studs for installation po-
sition, then perform steps 1 and 2.
1. Remove CTIS hose shield.
2. Remove tube and quick-disconnect valve from spindle.
3. Loosen, but do not remove, lug nuts (Figure 6-1).
4. Raise and support corner of vehicle.
5. Remove lug nuts and wheel from geared hub spindle.
6-1
4-1-00