Hummer H1 (2002+). Manual - part 101

 

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

 

 

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05745159

3.

Locate and mark wheel and tire assembly light spot on the
tire (Figure 6-31).

4.

Record weight and position readings.

 

Figure 6-31:   Marking Wheel and Tire Assembly Light 

Spot

 

NOTE: 

 

If more than 15 oz. of weight is required to balance the

tire, wheel and runflat (if installed) assembly, rotate tire 180°
on wheel. Tires on steel two piece wheels can be balanced us-
ing either adhesive backed tape-on or clip-on type balance
weights. All aluminum wheel and tire assemblies require the
use of tape-on weights only. Do not use wheel balancing liq-
uids to balance wheel and tire assembly. Balancing liquids may
be incompatible with and cause damage to wheel, tire, runflat,
and CTIS components.

 

NOTE: 

 

There is very little clearance between geared hubs and

the inside diameter of the wheels. When installing tape-on bal-
ance weights on the inside diameter of the wheel, position the
weights to afford adequate clearance to the geared hubs.

5.

Attach balance weights to inner and/or outer edges of
wheel (indicated by dynamic balancer), ensuring weight is
centered on light spot, or weights are placed evenly to
sides of light spot if more than one weight is used. When
installing weight clips, use a small hammer or clip-
clawhammer tool. Tap weights to conform to wheel flange
edge contour (Figure 6-32).

6.

Start balance cycle and repeat steps 3 through 5 until tire is
properly balanced.

7.

Remove wheel and tire assembly from dynamic balancer
and install on vehicle.

 

Figure 6-32:   Balance Weight Placement

LIGHT SPOT

WEIGHT CLIP

WEIGHT

LIGHT SPOT

WHEEL

LIGHT SPOT

WHEEL

WHEEL AND

TIRE ASSEMBLY

WHEEL AND

TIRE ASSEMBLY

(CLIP-ON TYPE)

WEIGHT

(TAPE-ON TYPE)

 

6-20

Wheels and Tires/Central Tire Inflation System (CTIS)

 

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TROUBLESHOOTING A NON-BALANCING 
WHEEL AND TIRE ASSEMBLY 

 

NOTE: 

 

If a wheel and tire assembly cannot be balanced, or

balance cannot be maintained, any of the following conditions
may be causing the problem:

• Runflat movement on the wheel rim.

• Excessive radial or lateral runout condition of the wheel.

• Improper seating of tire bead on the wheel flange.

 

NOTE: 

 

Perform the following if the runflat is moving on the

wheel. If an excessive runout condition is suspected, proceed to
Wheel Runout and Wheel and Tire Assembly Runout Inspection.

 

Suspected Runflat Movement Procedure

 

1.

Disassemble wheel and remove runflat from tire. 

2.

Clean inside of tire, wheel, and O-ring seal with soap and
water. Allow cleaned parts to dry prior to assembly.

3.

Apply runflat gel lubricant at crown area on inside tire
area.

4.

Install runflat into tire and assemble wheel.

5.

Balance wheel and tire assembly.

 

WHEEL RUNOUT INSPECTION

 

NOTE: 

 

It is suggested that the lateral runout check be done

first, as excessive lateral runout can affect radial runout. 

1.

Clean dirt, debris, or rust from wheel.

2.

Take measurements from inboard and outboard rim
flanges for radial and lateral runout. 

 

CAUTION: 

 

Never start the wheel balancer with the dial indi-

cator in place. The checks should be done by slowly rotating
the wheel BY HAND ONLY.

 

3.

With wheel or wheel and tire assembly on wheel balancer,
place magnetic base roller tip dial indicator in position.

4.

Slowly rotate the wheel one revolution and zero the dial
indicator. 

5.

Rotate the assembly one more complete turn and record
the indicator reading  (Figure 6-33).

6.

If measurement for 

 

lateral

 

 runout exceeds 0.060 inch

(1.52 mm), replace the wheel.

7.

If measurement for 

 

radial 

 

runout exceeds 0.060 inch (1.52

mm), replace the wheel.

 

Figure 6-33:   Wheel Runout Inspection Points

 

8.

Assemble and balance wheel and tire assembly  (Figure 6-32).
Every time a wheel and tire is assembled, it should be
balanced.

 

NOTE: 

 

An improperly seated tire will cause runout. Inspect

GG rings to be sure bead is properly seated.

9.

Be sure that the tire is properly mounted and seated on the
wheel. Check the distance between the GG rings on the
tire and the wheel flange. The distance between the GG
rings and the wheel flange should be the same (concentric)
all the way around the tire (Figure 6-34).

10. Verify that GG rings are not recessed below the wheel

flange at any point around the wheel.

11. If the GG rings are non-concentric with, or are recessed

below the wheel flange, remove the tire from the wheel
and reinstall.

12. Balance wheel and tire assembly.

 

Figure 6-34:   Checking Tire Bead Seating

INBOARD 

OUTBOARD 

SIDE

SIDE

RIM

CHECK

LATERAL
RUNOUT

HERE

CHECK

RADIAL

RUNOUT

HERE

GG RING

TIRE BEAD

PROPERLY SEATED

RIM

GG RING

RIM FLANGE

GG RINGS

TIRE BEAD

NOT SEATED

 

4-1-00

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

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05745159

Wheel And Tire Assembly Runout Inspection

NOTE:  Before measuring the runout of a tire and wheel as-
sembly, drive the vehicle long enough to warm up the tires.
Then do the following:

1.

Install tire and wheel assembly on wheel balancer.

2.

Check GG rings to be sure tire bead is properly seated.

3.

Position a dial indicator with a magnetic base and a roller
tip on the balancer so the different runout checks can be
done (Figure 6-35).

4.

NEVER start the wheel balancer with the dial indicator in
place. The checks should be done by slowly rotating the
tire BY HAND ONLY on the tire balancer.

5.

Slowly rotate the assembly one complete turn and zero the
dial indicator on the low spot.

6.

Rotate the assembly one more complete turn and note the
amount of total runout.

NOTE: In order to measure radial runout, it will be necessary
to tape the center tread of the tire (Figure 6-35). Otherwise, the
dial indicator stylus will catch in the tread lugs.

7.

Measure at points 1 and 2 (Figure 6-35). The maximum
allowable lateral and radial runout is 0.120 inch and 0.210
inch, respectively.

Figure 6-35:   Wheel and Tire Runout Checkpoints

Geared Hub Spindle and Stud Runout

When wheel and tire runout occurs on the vehicle but not in
off-vehicle inspecting, the geared hub spindle and spindle studs
should be checked for radial and lateral runout (Figure 6-36).

 

Figure 6-36:   Geared Hub Spindle Runout Inspection

Geared Hub Spindle Runout Inspection

Using a dial indicator, position the roller tip on the machined
surface outside the bolts on the spindle face.

Measure the runout using the following method:

1.

Turn the spindle by hand to locate the low spot.

2.

Zero the dial indicator.

3.

Turn the spindle by hand to check the total lateral runout.

4.

0.005 inch is the acceptable lateral runout.

Measuring Geared Hub Spindle Stud Runout

Position the dial indicator roller to contact the wheel mounting
studs. Ensure that the studs are fully pressed in, if not seat or
replace the studs as necessary (Figure 6-37).

Measure the runout using the following method:

1.

Turn the spindle by hand to register on each of the studs.

2.

Zero the dial indicator on the lowest stud.

3.

Check the total runout on the remaining studs.

4.

0.030 inch is the acceptable radial runout.

Figure 6-37:   Geared Hub Spindle Stud Runout 

Inspection

1. Tire Lateral Runout Checkpoints
2. Tire Radial Runout Checkpoint
3. Wheel Radial Runout Checkpoints
4. Wheel Lateral Runout Checkpoints

DIAL INDICATOR

1

1

2

3

3

4

4

TAPE

STRIP

GEARED HUB

SPINDLE

DIAL

INDICATOR

GEARED HUB

STUD

SPINDLE

6-22

Wheels and Tires/Central Tire Inflation System (CTIS)

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WHEEL ALIGNMENT

Check alignment on a rack with the front tires in the straight-
ahead position and inflated to manufacturer’s recommended
pressure. 

Preliminary Inspection 

1.

Check tire condition, tread wear (Figure 6-27), run-out, 
and inflation. 

2.

Raise and support vehicle so wheels are free to rotate.
Then secure the steering wheel in straight-ahead position.

3.

Check tie rods and upper control arms for distortion, play,
or looseness (Figure 6-38). Replace worn, damaged parts
before proceeding. 

NOTE: If the vehicle was previously lifted off the ground for
other service, center the steering wheel, roll the vehicle for-
ward and back to settle the suspension and relieve the tension
on the ball joints before beginning checking procedure.

4.

Check upper ball joints: With the vehicle on the ground
(being careful not to damage the boot), place the tip of a
prybar between the steering knuckle and the ball joint boot
(Figure 6-39). With the shank of the prybar contacting the
upper control arm as shown, pry upward and note the
movement of the ball joint against a ruler. Be careful to
measure only the ball joint movement and not the flex of
the control arm resulting from prying against it. Any upper
ball joint with more than 1/16” (1.6 mm) movement
should be replaced.

5.

Check geared hubs for spindle end play or side-to-side
movement by grasping the edge of the tire and attempting
to move the tire up and down.

NOTE: If any spindle movement is apparent, adjust the spin-
dle bearings.

Figure 6-38:   Suspension Inspection Components

CONTROL ARM 

UPPER 

UPPER 

GEARED HUB

LOWER 

TIE ROD

CONTROL ARM

 BUSHING

BALL JOINT

BALL JOINT

CONTROL

 ARM

BUSHING

STABILIZER

BAR