Hummer H1 (2006+). Manual — part 213

6-2

Wheels and Tires/Central Tire Inflation System (CTIS)

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JACKING AND WHEEL REPLACEMENT

WARNING: Always take the wheel to an authorized service center for proper servicing. Use 17 inch diameter 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 re-
moving wheel. Avoid removing any wheel when vehicle is on sloping terrain. Personal injury or damage to equip-
ment may result. Remove only the inner group of lug nuts when removing a wheel from the vehicle. Removing the
outer nuts which hold the rim together while the assembly is inflated could result in serious injury 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 in-
jury or death.

NOTE: Always depress both CTIS quick-disconnect valve tabs on each axle set to prevent air loss from the other tire.

Removal

1.

Remove the lug cover.

2.

Remove the tube and quick-disconnect valve from spindle.

3.

Loosen, but do not remove, the lug nuts (Figure 6-1).

j

Figure 6-1: Wheel and Tire Assembly Replacement

4.

Position the jack under the lower control arm at the tire and wheel assembly to be replaced. The alignment post on the top of
the jack should be placed directly below the receiving hole in the lower control arm (Figure 6-2).

5.

Using the ratchet, turn the jack handle clockwise to raise the vehicle. Ensure the “UP” side of the is facing you.

6.

Remove the lug nuts and the wheel from the geared hub spindle.

GEARED HUB

SPINDLE

WHEEL AND TIRE

ASSEMBLY

LUG
NUT

CENTER

CAP

12-1-05

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

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Figure 6-2: Jack Position

Installation

NOTE: The Wrangler GS-A, 37 X 12.50R17 LT touring radial tire has an asymmetrical/directional tread design. The heavier,
stiffer tread goes on the outside shoulder of the tire, and must face outward when being installed. Before installing on a wheel, in-
spect the sidewall of the tire and ensure SIDE FACING OUTWARDS imprint is facing outward (Figure 6-3).

NOTE: Install the lug nuts with fingers to full engagement. If the nuts resist finger tightening examine the studs and the nuts for
damage and replace if damaged.

1.

Position the wheel on the geared hub spindle according to the marks on the mounting studs and attach with lug nuts (Figure
6-1).

Figure 6-3: Side Facing Outwards Location

1.

Remove the support and lower the corner of the vehicle.

2.

One and two-piece aluminum wheel lug nut torque is 110 lb-ft (149 N•m). Use tightening sequence as shown in (Figure 6-4).

ALIGNMENT

POST

RECEIVING

POST

JACK

JACK

HANDLE

RATCHET

6-4

Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-4: Lug Nut Tightening Sequence

CAUTION: Do not allow pipe thread sealant into air system. Sealant will damage CTIS components and inhibit the CTIS opera-
tion.

3.

Install the CTIS quick-connect valve and tube on the spindle.

4.

Install the lug cover.

TIRE, TWO-PIECE ALUMINUM WHEEL AND RUN FLAT REPLACEMENT

WARNING: Do not use tire machine. Personal injury or damage to equipment may result.

Removal and Disassembly

1.

Remove the lug cover.

2.

Release the quick disconnect fitting located in the center of the geared hub spindle on both wheels of the same axle.

3.

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

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

4.

Remove the wheel/tire assembly from the vehicle.

5.

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

6.

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

7.

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

8.

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

9.

Run a piece of wire through the air valve to ensure it is not plugged (Figure 6-5).

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

10. When the tire is fully deflated, use a circular pattern and loosen the twenty wheel half locknuts securing the rim halves

together. If you hear air escaping, DO NOT proceed. Wait until the sound stops and recheck the core housing for obstructions.
When you are certain the tire is fully deflated, continue to remove the wheel half locknuts. Examine the locknuts for damage
and replace if necessary.

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

11. Install the four wheel separation bolts (J–45760) through the threaded holes in the inner wheel half (Figure 6-6). Using an air

ratchet (NOT AN IMPACT WRENCH), turn each bolt in approximately a half inch at a time until the outer wheel half is
released from the tire bead.

TIGHTENING SEQUENCE

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

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12. Remove the outer rim half and the four separation bolts.

Figure 6-5: Two-Piece Aluminum Wheel Breakdown

02-P06-004.1

TIRE

INNER RIM HALF

O-RING SEAL

OUTER

VALVE CORE

RIM HALF

VALVE CAP

WHEEL HALF

LOCKNUT

LUG

RETAINING

SCREW

WHEEL

STUD

COVER

RUNFLAT

BALANCE
WEIGHT