Hummer H2. Manual — part 2187

Tools Required

J 8001 Dial Indicator Set

Upper Ball Joint Inspection

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

2. With the wheel and tire on the vehicle, lift the suspension corner by hand to determine if any looseness is

present. If vertical free play is experienced proceed with the following instructions.

3. Remove the wheel and tire. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

4. Support the lower control arm with a floor stand or jack, as far outboard as possible.

5. If a seal is cut or torn, replace the ball joint.

6. Clean and inspect the ball joint seals for cuts or tears. If the ball joint seals are damaged, replace the ball

joint. Refer to Upper Control Arm Replacement in Front Suspension.

7. Check the wheel bearing for looseness in the wheel bearing is present, refer to Wheel Bearings

Diagnosis .

8. Check the upper ball joint for vertical looseness.

9. Remove the lower shock absorber mounting bolt. This will ensure that the suspension is unloaded.

10. Install and position the dial indicator from J 8001 against the rim of the upper ball joint.

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

Fig. 2: Installing & Positioning Dial Indicator From J8001 Against Rim Of Upper Ball Joint
Courtesy of GENERAL MOTORS CORP.

11. Apply downward force to the upper control arm and zero the indicator pointer/pad against the rim of the

upper ball joint.

12. Release the arm and check the dial indicator. The dial indicator reading should be no more than 2 mm

(0.079 in). If the reading is too high, replace the upper control arm. Refer to Upper Control Arm
Replacement in Front Suspension.

STRUTS OR SHOCK ABSORBERS ON-VEHICLE TESTING

Struts or Shock Absorbers On-Vehicle Testing

Step

Action

Yes

No

1

Did you review the General Description and perform the
necessary inspections?

Go to

Step 2

Go to Symptoms -

Suspension General

Diagnosis

2

Verify that the customer's concern is present.

System

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

WHEEL BEARINGS DIAGNOSIS

Wheel Bearings Diagnosis

Does the vehicle operate normally?

OK

Go to Step 3

3

Inspect each shock absorber for external fluid leakage.Is a strut
or shock absorber leaking?

IMPORTANT:

A light film of oil on the top portion of the shock reservoir is
normal.

Go to

Step 5

Go to Step 4

4

1. Use your hands in order to lift up and push down each

corner of the vehicle 3 times.

2. Remove your hands from the vehicle.

3. Locate a shock or strut that exceeds 2 cycles.

Did you locate shock or strut that exceeds 2 cycles?

Go to

Step 5

Go to Step 6

5

Replace the shock absorber. Refer to Shock Absorber
Replacement in Front Suspension or Shock Absorber
Replacement in Rear Suspension.Did you complete the repair?

IMPORTANT:

Inspect the vehicle trim height in order to correct any
possible causes of shock/strut failures. Refer to Trim Height
Inspection Procedure .

Go to

Step 6

-

6

Operate the vehicle in order to verify the repair.
Did you correct the condition?

System

OK

Go to Step 3

Step

Action

Values

Yes

No

1

Did you review the General Description and perform
the necessary inspections?

-

Go to

Step 2

Go to Symptoms -

Suspension General

Diagnosis

2

Road test the vehicle in order to verify the customer's
complaint.
Does the vehicle operate normally?

-

System

OK

Go to Step 3

3

1. Raise and support the vehicle. Refer to Lifting

and Jacking the Vehicle in General Information.

2. Inspect for tire or wheel damage. Refer to Tire

and Wheel Assembly Runout Measurement -
On-Vehicle in Vibration Diagnosis and
Correction.

Did you find and correct the condition?

-

Go to

Step 7

Go to Step 4

1. Install the J 39570 chassis ear.

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

TRIM HEIGHT INSPECTION PROCEDURE

Trim Height Measurements

Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause
bottoming out over bumps, damage to the suspension components and symptoms similar to wheel alignment
problems. Check the trim heights when diagnosing suspension concerns and before checking the wheel
alignment.

Perform the following before measuring the trim heights:

1. Set the tire pressures to the pressure shown on the certification label. Refer to Label - Vehicle

Certification (w/o RPO Z49) or Label - Vehicle Certification (w/RPO Z49) in General Information.

4

2. Road test the vehicle to verify the location of the

wheel bearing noise.

Did you locate the source of the wheel bearing noise?

-

Go to

Step 6

Go to Step 5

5

1. Raise and support the vehicle. Refer to Lifting

and Jacking the Vehicle in General Information.

2. Remove the wheel and tire. Refer to Tire and

Wheel Removal and Installation

3. Mount and secure the J 8001 to the steering

knuckle.

4. Firmly push the hub flange towards the vehicle.

5. Ensure that the J 8001 contacts the vertical

surface of the hub flange as close as possible to
the center of the flange.

6. Firmly pull the hub flange away from the vehicle.

7. Inspect the total movement indicated by the J

8001 .

Is the measurement greater then the specified value?

IMPORTANT:

If you are inspecting the FRONT wheel
bearing/hub, support the front of the vehicle
by the lower control arms in order to load the
lower ball joint.

0.051 mm

(0.002 in)

Go to

Step 6

System OK

6

Replace the wheel bearing. Refer to Wheel Hub,
Bearing, and Seal Replacement in Front Suspension.
Did you complete the repair?

-

Go to

Step 7

-

7

Road test the vehicle to verify the repair.
Does the vehicle operate normally?

-

System

OK

Go to Step 3

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2