Hummer H1 (2002+). Manual - part 97

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-3

05745159

Remove the brass fitting from the center of the geared
hub spindle on the wheel(s) to be worked on.

Use tire chalk to mark two of the geared hub spindle
assembly studs nearest the air valve.

WARNING: In all disassembly operations, ensure tire
is totally deflated before removing wheel half locknuts.
Failure to follow proper safety precautions could cause
serious injury or death.

Remove wheel/tire assembly from vehicle.

Inspect vehicle geared hub spindle studs for bending,
looseness, or stripped threads. Replace if damaged.

Inspect lug nuts for fatigue, stripped threads, or other
damage. Replace if damaged.

Use tire chalk to mark the valve location on the sidewall of
the tire.

Remove valve cap and core from air valve and deflate tire.

Run a piece of wire through air valve to ensure it is not
plugged (Figure 6-3).

WARNING: Do not use unauthorized tools. Damage to
equipment or serious injury may result.

Remove wheel half nut covers.

When tire is fully deflated, use a circular pattern and
loosen twelve wheel half locknuts securing rim halves
together. If you hear air escaping, do not proceed. Wait
until the sound stops and recheck core housing for
obstructions. When you are certain the tire is fully
deflated, continue to remove wheel half locknuts. Discard
locknuts.

WARNING: Never inflate a two-piece wheel assembly
with the wheel locknuts removed in an attempt to sepa-
rate inner and outer rim halves. The assembly will sepa-
rate under pressure resulting in serious injury or death.

10. Remove outer rim half from inner rim and tire.

NOTE:

Perform steps 6 and 7 only if damage to core housing,

insert, or O-ring is evident.

11. Inspect valve core housing and insert for damage. Replace

both if damaged.

12. Remove valve core housing from insert. Remove insert

and locknut from outer rim half.

Figure 6-4: Two-Piece Wheel Breakdown

00-S06-007

TIRE

INNER RIM HALF

O-RING SEAL

OUTER

O-RING

INSERT

VALVE CORE

RIM HALF

WEIGHT

CORE

HOUSING

CLIP-ON

BALANCE

VALVE CAP

LOCKNUT

ALIGNMENT

HOLE

WHEEL HALF

LOCKNUT

6-4

Wheels and Tires/Central Tire Inflation System (CTIS)

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13. Remove O-ring from insert. Discard O-ring.

14. Remove O-ring seal from inner rim half. Discard O-ring

seal.

15. Remove tire from inner rim half.

WARNING: Balance weights contain lead. Wash hands
after handling.

16. Remove balance weights from rim halves. Discard balance

weights.

17. Lay tire flat.

WARNING: To avoid injury, ensure runflat compres-
sor strap is centered around runflat.

18. Position runflat compressor on an outer edge of runflat

with handle assembly facing up and strap centered around
runflat (Figure 6-5).

Figure 6-5: Runflat Compressor

Operation

NOTE:

Compress runflat by rotating the handle assembly in a

clockwise direction. Rotate handle assembly counterclockwise
to loosen.

19. Using runflat compressor, compress runflat.

NOTE:

It may be necessary to use a tire spoon and tire lube to

remove runflat from tire. When using runflat compressor, it
may be necessary to remove handle before removing runflat.

20. Remove runflat from tire and remove runflat compressor

from runflat (Figure 6-6).

Figure 6-6: Runflat Appearance After Removal

Inspection and Cleaning

CAUTION:

Do not reuse a tire which has been run flat without

thoroughly inspecting for damage. Failure to follow these in-
structions may result in damage to equipment.

Remove any existing lubricant that has been previously
applied to the inside of the tire using a mild detergent soap
and water.

Dry all wheel and tire parts. Ensure inside of tire is free of
any runflat lubricant, dirt, debris, rust, or moisture.

WARNING: Thorough tire inspection is critical. Con-
tinued use of worn or damaged tires could result in
equipment damage, serious injury or death.

Inspect inside of tire for cord or belt separation and inner
liner damage. Replace tire if damaged.

Inspect tire bead for abrasions. Replace tire if damaged.

Check for protruding objects inside tire which may not be
visible from outside. If tire is punctured yet repairable,
repair with internal (05710215) or external (05710216)
tire repair kit.

Check tread depth on tire. Tread should not be worn below
level of wear bars (Figure 6-7). Markings on the sides of
the tires (e.g., the letters “TWI” or a triangle) show the
location of wear bars. Replace tire if tread is worn below
wear bars or 3/32 inch (2.38 mm).

Inspect runflat for splitting, cracking, wear, or excessive
chafing. Damaged runflat performance will be non-
existent or greatly reduced. Replace runflat if damaged
(Figure 6-6).

RUNFLAT

HANDLE

CRANK

RUNFLAT

COMPRESSOR

STRAP

J–39250

COMPRESSOR

RUNFLAT

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-5

05745159

Inspect outside of tire for sidewall damage. Replace tire if
damaged.

Inspect tread for puncture damage. If damage is too
extensive for patch repair, replace tire.

WARNING: O-ring sealing surfaces must be kept clean
and free from rust and dirt. Failure to do so could cause
the wheel assembly to separate under pressure causing
serious injury or death.

10. Using wire brush, clean wheel attaching studs. Clean all

dirt and foreign material from rim halves with soap and
water and allow to air dry. Ensure O-ring sealing surfaces
on rim halves are smooth and clean (Figure 6-8).

11. Inspect rim halves for cracks, bent sealing surfaces, or

oversized mounting holes. Replace rim halves if cracked,
bent, or if mounting holes are reamed.

Figure 6-7: Wear Bar Identification

Figure 6-8: Two-Piece Rim Breakdown

WEAR BARS

00-S06-006

CAP

VALVE

CORE

OUTER

RIM

HALF

INNER

RIM HALF

STUDS

O-RING

SEALING

SURFACE

CORE

HOUSING

WHEEL

HALF

LOCKNUT

O-RING

VALVE
INSERT

O-RING

WHEEL HALF

LOCKNUT

6-6

Wheels and Tires/Central Tire Inflation System (CTIS)

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WARNING: Never use wheel assemblies with wheel
half studs that are damaged, loose, or have stripped
threads. Damaged studs can cause improper assembly
which could cause individual fasteners to fail. Any of
these situations could cause serious injury or death.

NOTE:

When replacing a damaged wheel half stud, also re-

place two adjacent studs.

12. Inspect inner rim half for cracked, broken, rusted, pitted,

bent, loose, or stripped studs.

Replace damaged studs

along with two adjacent studs

. Failure to do so may

result in equipment damage, personal injury or death.

13. Inspect valve core for cracks or deterioration. Replace

valve core if damaged (Figure 6-8).

14. Inspect core housing for cracks or deterioration. Replace if

damaged.

15. Inspect insert and cap for damage. Replace if damaged.

Repair

If studs are damaged, drive studs out of inner rim half.
Discard studs (Figure 6-9).

Align splines on studs with splines in inner rim half and
drive studs into inner rim half until shoulders seat against
inner rim half.

Figure 6-9: Inner Rim Half Stud Removal

Assembly

WARNING: Never use tubes in the two-piece take-
apart wheel assemblies. Use of a tube defeats built-in
safety features of the wheel, and could cause the wheel
to come apart under pressure, resulting in serious in-
jury or death. Use only replacement parts specified in
parts manual. Wheels assembled with components
which do not meet specifications could cause the assem-
bly to separate under pressure, resulting in serious in-
jury or death. To avoid injury ensure runflat
compressor strap is centered on runflat.

Apply one 11-ounce tube of gel lubricant around inside of
tire at crown area. Using clean brush, evenly spread gel
lubricant 4 to 5 inches wide on tire crown area (Figure 6-10).

Figure 6-10: Runflat Gel Lubricant Application

Position runflat compressor on an outer edge of runflat
with handle assembly facing up and strap centered around
runflat (Figure 6-11).

00-S06-008

INNER RIM HALF

STUDS

WHEEL

HALF

TIRE

GEL LUBRICANT

4 TO 5
INCHES

CROWN AREA

OF TIRE

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