Hummer H1 (2006+). Manual - part 216

6-14

Wheels and Tires/Central Tire Inflation System (CTIS)

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19. Apply a thread-locking compound to the core housing and thread the valve bore into the valve hole on the outer rim half.

Tighten the core housing to 25-30 lb-ft (34-41 N•m).

20. Place the wheel assembly in a safety cage and inflate the tire to the recommended tire pressure.

21. Check for leaks around the rim edges, the quick disconnect valve and the CTIS hose with soapy solution(Figure  6-18).

Figure 6-18:   Leak Check Areas

WHEEL HALF STUD REPLACEMENT

Removal

1.

Remove the wheel from the vehicle.

2.

Place the wheel in a tire inflation cage.

WARNING:  Ensure the tire is totally deflated before removing wheel locknuts. Failure to follow proper safety pre-
cautions may result in serious injury or death.

3.

Remove the CTIS hose and quick disconnect and deflate the tire. 

02-S06-011

RIM

EDGE

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 Wheels and Tires/Central Tire Inflation System (CTIS)  6-15

5745804

Figure 6-19:   Wheel Half Stud Replacement

NOTE: When replacing broken rim stud(s), replace studs on both sides of the broken stud(s).

4.

When the tire is fully deflated, loosen the wheel locknuts on each side of the broken stud(s). If you hear escaping air, do not proceed.
Wait until the sound stops and recheck the valve bore. When you are certain the tire is fully deflated, proceed to remove the wheel
locknut(Figure  6-19). Discard the locknut.

5.

Drive the studs out of the outer rim. Discard the studs.

Cleaning and Inspection 

1.

Using a wire brush, clean the remaining studs. Clean all dirt and foreign material from the rim with soap and water and allow
to air dry.

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

2.

Inspect the outer rim for cracked, broken, corroded, pitted, bent, or loose studs, and studs with damaged, mutilated, or deformed
threads. Replace any defective parts(Figure  6-19).

Installation

1.

Align the stud with the splines in the outer rim and pull the stud into the outer rim using a 1/2-20 nut, a washer and a larger nut 
as a spacer until the stud shoulder seats against the outer rim(Figure  6-19).

2.

Repeat step 1 for all studs being replaced.

CAUTION: Tighten locknuts gradually to avoid bent and broken studs, or damage to wheel components will result.

02-S06-012

TIRE

WHEEL HALF 

LOCKNUT

STUD

6-16

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

3.

Install new locknuts on all of the new studs.

NOTE: After replacing the broken stud(s), all wheel locknuts must be re-torqued.

4.

Tighten all locknuts to 50 lb-ft (68 N•m) in sequence shown (Figure  6-20).

5.

Tighten all locknuts to 75 lb-ft (102 N•m) in sequence shown.

Figure 6-20:   Wheel Half LockNut Tightening Sequence

6.

Check the wheel assembly for gaps at each stud. Use a 0.0015 in. (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.

WARNING:  Never inflate a wheel assembly without having checked wheel locknut torques to ensure the wheel
locknuts are tightened to specifications. An assembly with improperly tightened locknuts could separate under pres-
sure, resulting in serious injury or death.

WARNING:  Always use a tire inflation cage for inflation purposes. Stand on one side of the cage during inflation,
never directly in front. Keep hands out of cage during inflation. Inflate assembly to recommended pressure, using a
clip-on air chuck. Do not exceed 50 psi (345 kPa) cold inflation pressure. Failure to follow these instructions may
result in serious injury or death.

7.

Place the wheel in a safety cage and inflate the tire to the recommended tire pressure.

8.

Check for leaks around the rim edges, the quick disconnect valve and the CTIS hose with soapy water.

9.

Install the wheel on the vehicle.

RUN FLAT COMPRESSOR BELT REPLACEMENT

Removal

1.

Remove the roll pin and the washer.

2.

Remove the retaining bracket.

3.

Remove the belt from the compressor.

Installation

1.

Install the belt on the compressor (Figure  6-21). 

2.

Install the retaining bracket (Figure  6-21)

3.

Install the washer and the roll pin (Figure  6-21). 

02-S06-020

1

19

6

10

16

4

12

18

7

14

2

20

9

5

17

11

3

15

8

13

6-1-05

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 Wheels and Tires/Central Tire Inflation System (CTIS)  6-17

5745804

Figure 6-21:    Run Flat Compressor Belt Installation

TIRE, ONE-PIECE ALUMINUM WHEEL, AND TWO-PIECE RUN FLAT SERVICE 

CAUTION: It is not recommended mixing one-piece wheel and run flat assemblies and two-piece take-apart wheel and run flat as-
semblies on the same vehicle. run flat profiles differ between the two types of wheel assemblies.

Disassembly

1.

Remove the lug cover.

If the vehicle is equipped with a Central Tire Inflation System (CTIS), perform steps a and b.

a.

Release the quick disconnect fitting located at the center of the geared hub spindle on all four wheels.

b.

Remove the 3/4 inch brass fitting from the center of the geared hub spindle on the wheel(s) to be worked on.

2.

Remove the wheel/tire assembly from the vehicle.

3.

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

4.

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

5.

Remove the valve cap and core from the air valve and deflate the tire. Run a piece of wire through the air valve to ensure it is
not plugged.

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

6.

Remove the balance weights from the wheel if present. Discard the balance weights.

7.

Install the wheel/tire assembly on the tire machine.

8.

Using a tire machine, break loose both tire beads.

9.

Lubricate the outside tire bead and use the tire machine to remove the bead from the wheel flange. 

10. Pull the tire bead up and away from the wheel to expose the run flat assembly. This can be accomplished with a pry bars or a

bead spreader devise6-22.

BELT

RETAINING

BRACKET

WASHER

ROLL

PIN