Hummer H1 (2006+). Manual - part 217

6-18

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

Figure 6-22:   Run Flat Removal

11. Remove the retaining screw, washer and cross bolt locking clip (Figure  6-23).

12. Loosen and remove the cross bolt and square nuts securing the run flat halves together.

13. Repeat steps 11 through 13 for opposing fastener assembly.

14. Reach inside the tire and remove the run flat halves from the tire.

15. Lubricate the tire bead and remove the tire from the wheel. 

Inspection and Cleaning

Cleaning

1.

Remove any existing lubricant that has been applied to the inside of the tire, using a tire buffing solution.

2.

Clean all of the wheel, run flat and tire parts using tire buffing solution.

3.

Dry all of the wheel, run flat and tire parts. Ensure the inside of tire and all of the wheel, run flat and tire parts are free of any
run flat lubricant, dirt, rust or moisture.

 Tire Inspection 

1.

Inspect the tire for the following conditions or defects. Replace the tire if damaged.

a.

Inspect the inside of the tire for cord or belt separation and inner crown area damage.

b.

Inspect the tire bead for damage. 

c.

Check for protruding objects inside the tire which may not be visible from outside. If tire is damaged, repair with external
or internal tire repair kit.

d.

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

Run Flat Inspection

1.

Inspect the run flat for the following conditions or defects. Replace the run flat(s) if damaged.

a.

Splitting or separation of rubber from the composite material.

b.

Wear or damage of the outside rim or centering flange.

c.

Excessive chafing or particles of the tire’s steel belt embedded into the run flat assemblies.

d.

Cross bolts for stress fatigue, cracks or thread damage.

SID

EF

A

CIN

GO

UT

WA

RD

S

00-S06-010

LOCKING

CLIP

CROSS BOLT

SQUARE

NUT

RETAINING

SCREW

RUN FLAT

BEAD

SPREADER

WASHER

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-19

5745804

e.

Square nuts for stress fatigue, cracks or other damage.

f.

Cross bolt locking clip and retaining screw for damage.

Wheel Inspection

1.

Inspect the wheel for the following conditions or defects. Replace the wheel if damaged.

a.

Cracked or bent.

b.

Mounting bolt holes for stress fatigue, oversized holes, or other damage.

c.

Wheel flange for stress fatigue, deformation or other damage.

d.

Quick disconnect valve and hose for cracks or deterioration. Replace these items if damaged.

Assembly

NOTE: If tires are to be replaced allow the new tires to reach room temperature (above 60°) before mounting. This will make the
tire more pliable and easier to work with.

CAUTION: During assembly or disassembly, loose parts which are dropped inside the wheel/tire assembly must be removed. Fail-
ure to do so could result in damage to wheel/tire assembly. 

1.

Apply one tube (approximately 11 ounces) of run flat gel lubricant to inside crown area of tire. Using clean brush, evenly 
spread gel lubricant 4 to 5 inches wide on inner crown area.

6-20

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

Figure 6-23:   Run flat Installation

SIDE FA

CING

OUT

W

ARD

S

00-S06-012

CROSS BOLT

SQUARE NUT

LOCKING

CLIP

SCREW

RECESS

WASHER

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-21

5745804

Figure 6-24:   Run Flat Assembly

2.

Position the wheel on the tire machine with the outside facing up. Lubricate the tire beads and mount the inside tire bead on the
wheel. Ensure the “SIDE FACING OUTWARDS” lettering is faces up on GSA tires. 

3.

Install the right and left square nuts in the recesses of one pair of run flat ends. When looking across the run flat to the opposite
side, the “R” square nut should be in the right recess and the “L” square nut in the left recess(Figure  6-24).

4.

Start the cross bolt in one of the square nuts, then in the second nut and tighten until there is full engagement in both nuts. The
thread engagement must be equal in both nuts.

5.

Using a bead spreader, insert the run flat halves in the tire.

6.

Align the gap between the second pair of run flat ends with one of the positioning fences on the wheel.

7.

Assemble the second pair of run flat ends as in steps 3 and 4 and adjust the gap between the run flat ends to 53/64" (21 mm).

NOTE: The distance between the two run flat end gaps must remain equal to reduce the risk of imbalance.

8.

Verify that the positioning fences are centered in the run flat end gaps and the gaps are equal. 

9.

Torque both cross bolts to 22 lb-ft (30 N•m) and install cross bolt locking clips, screws and washers.

10. Torque the locking clip screws to 30-35 lb-in (4-5 N•m).

11. Lubricate the tire bead and mount the tire bead on the wheel.

NOTE: Before installing a new tire inspect the tire sidewalls for a “paint dot.” Paint dots are often painted on tires to indicate the
tire’s light spot for balancing purposes and may be located on either side of the tire. If paint dot is present, position tire on wheel so
that paint dot is aligned with air valve on wheel. If the paint dot is not on the air valve side of tire, reference paint dot from other
side of the tire for proper positioning with the air valve.

00-S06-013

L

R

LOCKING

CLIP

21 MM

RETAINING

SCREW