Hummer H1 (2006+). Manual — part 215

6-10

Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-13: Run Flat Compressor Positioning

NOTE: Compress the run flat by rotating the 3/4 nut in a clockwise direction. Rotate the 3/4 nut counterclockwise to loosen.

3.

Using a run flat compressor, compress the run flat(Figure 6-13).

4.

Lubricate the bead and run flat with tire lube (Figure 6-14).

Figure 6-14: Run Flat Insertion

5.

Insert the run flat, compressor side first, as far as possible into tire.

6.

Lay the tire flat on it’s side. Slowly loosen the compressor. The run flat should position itself inside the tire. If not, repeat steps
4 through 6 and/or use a tire spoon to assist in installation.

NOTE: If required, clean and lubricate the bearing assembly on the run flat compressor after removal.

7.

Remove the run flat compressor from the tire.

8.

Lubricate the O-ring seal with tire lube and install a new O-ring seal in the groove of the inner rim half. Ensure the O-ring seal
is not twisted and is uniformly positioned in the groove. Do not overstretch the O-ring seal (Figure 6-17).

9.

Lubricate the tire bead, rim bead seat area and the o-ring with tire lube.

STRAP

RUN FLAT

RUN FLAT

COMPRESSOR

TIRE

RUN FLAT

TIRE

BEAD

RUN FLAT COMPRESSOR

12-1-05

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-11

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NOTE: Before installing the tire on the inner rim half, inspect the tire sidewalls for a “paint dot.” Paint dots are often used to indi-
cate the tire’s light spot for balancing purposes. If a paint dot is present, position the tire on the rim halves so that the paint dot is
aligned with the valve insert on the outer rim half.

10. Place the outer rim half on a piece of cardboard or some other protective surface with the studs facing up.

11. Center the run flat in the tire. Carefully lower the tire over the outer rim half while lining up the notch in the runflat with the air

valve notch in the wheel half.

CAUTION: Ensure that the run flat is properly aligned with the valve stem in the wheel. Improper alignment can result in non-uni-
form bead pressure and improper run flat operation.

12. Ensure the run flat is not binding on any flat portion of inner rim half. The run flat should clear the inner rim half.

13. Set the inner rim half in the tire assembly while lining up the threaded holes in the inner half with the four spreader tool

receiver holes in the outer half.

14. Place the wheel half locknuts on the four long studs and alternately tighten the nuts until the remaining sixteen nuts can be

started on their studs.

CAUTION: Tighten locknuts gradually to avoid bending and/or breaking studs, or damage to wheel components.

NOTE: If the tire bead does not seat on the rim flange after inflation, deflate the tire completely and remove from the rim. Check
to ensure that a 17 inch diameter tire is being used. Also check for bent or damaged components and replace if necessary. Lubricate
the tire bead and rim mating surfaces and reinstall the tire on rim.

15. Preliminarily tighten locknuts to 50 lb-ft (68 N•m) in tightening sequence shown (Figure 6-15).

Figure 6-15: Locknut Tightening Sequence

16. Retighten locknuts to 75 lb-ft (102 N•m) in the sequence shown.

17. Turn the tire and rim assembly over so the outer rim half is exposed.

18. Check the wheel assembly for gaps at each stud(Figure 6-16). Use a 0.0015 inch (0.038 mm) thickness gauge to detect gaps.

If gaps are detected, disassemble and reassemble the wheel assembly and recheck for gaps. If gaps are still detected, replace
the outer rim half.

02-S06-020

1

19

6

10

16

4

12

18

7

14

2

20

9

5

17

11

3

15

8

13

12-1-05

6-12

Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-16: Checking Wheel Stud Gap

02-S06-019

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-13

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Figure 6-17: Two-Piece Wheel with One-Piece Run flat Breakdown

WARNING: Never inflate a tire without having checked wheel half locknut torques to ensure the wheel locknuts
are tightened to specifications. A wheel with improperly tightened locknuts could separate under pressure, resulting
in serious injury or death. Always use a tire inflation cage for inflation purposes. Stand on one side of cage during
inflation, never directly in front. Keep hands out of the cage during inflation. Inflate the tire to recommended pres-
sure using a clip-on air chuck. Do not exceed 50 psi (345 kPa) cold inflation pressure. Failure to follow these in-
structions may result in serious injury or death.

NOTE: Perform the following step only if core housing was removed.

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