Hummer H2. Manual — part 2188

2. Check the fuel level. Add additional weight if necessary to simulate a full tank.

3. Make sure the rear compartment is empty except for the spare tire.

4. Make sure the vehicle is on a level surface, such as an alignment rack.

Z Height Measurement

1. Lift the front bumper of the vehicle up about 38 mm (1.5 in).

2. Remove your hands.

3. Allow the vehicle to settle into position.

4. Repeat this jouncing operation 2 more times for a total of 3 times.

Fig. 3: Measuring Z Dimension
Courtesy of GENERAL MOTORS CORP.

5. Measure from the pivot bolt center line (3) down to the lower corner (5) of the lower ball joint (1) in

order to obtain the Z height measurement (4).

6. Push the front bumper of the vehicle down about 38 mm (1.5 in).

7. Remove your hands.

8. Allow the vehicle to rise.

9. Repeat the operation for a total of 3 times.

10. Measure the Z dimension.

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

11. The true Z height dimension number is the average of the high and the low measurements. Refer to Trim

Height Specifications .

Z Height Adjustment

1. For vehicles equipped with a torsion bar suspension turn the bolt (1) that contacts the torsion arm

clockwise to raise the and counterclockwise to lower the height adjustment. One revolution of the bolt (1)
into the nut increases the Z height by approximately 6.0 mm (0.2 in).

Fig. 4: Turning Bolt That Contacts Torsion Arm (Vehicles Equipped With Torsion Bar
Suspension)
Courtesy of GENERAL MOTORS CORP.

2. For vehicles without torsion bars, replace damaged or worn components as necessary.

D Height Measurement

The D height dimension measurement determines the proper rear end ride height. There is no adjustment
procedure. Repair may require replacement of suspension components.

1. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).

2. Remove your hands.

3. Allow the vehicle to settle into position.

4. Repeat the jouncing operation 2 more times for a total of 3 times.

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

Fig. 5: Measuring D Height Dimension
Courtesy of GENERAL MOTORS CORP.

5. The D height is obtained by measuring the distance between the edge of the jounce cup along the jounce

bumper center line and the jounce pad on the rear axle.

6. The true D height dimension number is the average of the high and the low measurements. Refer to Trim

Height Specifications .

7. If these measurements are out of specifications, inspect for the following conditions:

z

Sagging front suspension

Refer to Torsion Bar Replacement in Front Suspension.

z

Sagging rear coil springs

Refer to Coil Spring Replacement in Rear Suspension.

z

Proper air suspension operation.

z

Worn rear suspension components.

z

Improper tire inflation

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

z

Improper weight distribution

z

Collision damage

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools

Illustration

Tool Number/Description

J 8001

Dial Indicator

J 39570

Chassis Ear

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2