Hummer H3. Manual — part 1582

See Special Tools.

3. Elevate the left or right front of the vehicle and install a suitable vehicle support,

maintaining contact between one front wheel and the shop floor. Refer to Lifting and
Jacking the Vehicle .

Fig. 3: Checking Tie Rod-To-Steering Knuckle Lash
Courtesy of GENERAL MOTORS CORP.

4. Install dial indicator J 8001 or equivalent between the outer tie rod end and steering

knuckle as shown. Push slowly inward with one hand on the tire to remove the lash.

In the graphic above, the wheel and tire are removed for clarity.

5. Place the dial indicator at zero, pull outward on the tire. Record the amount of movement in

the joint.

Movement should not exceed 1.0 mm (0.04 in). If movement exceeds 1.0 mm (0.04 in)
replace the outer tie rod end. Refer to Rack and Pinion Outer Tie Rod End

2007 Hummer H3

2007 STEERING Power Steering - H3

Replacement.

6. Repeat this procedure for the other side of the vehicle.

POWER STEERING SYSTEM BLEEDING

1. Fill pump reservoir with fluid to minimum system level, FULL COLD level or middle of

hash mark on cap stick fluid level indicator.

2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following

procedure:

1. Start the engine.

2. Firmly apply the brake pedal 10-15 times.

3. Turn the engine OFF.

3. Raise the vehicle until the front wheels are off the ground. Refer to Lifting and Jacking

the Vehicle .

4. Key on engine OFF, turn the steering wheel from stop to stop 12 times.

Vehicles equipped with hydro-boost systems or longer length power steering hoses may

IMPORTANT:

Use clean, new power steering fluid type only. See the
Maintenance and Lubrication subsection for fluid
specifications. Refer to Fluid and Lubricant
Recommendations .

Hoses touching the frame, body or engine may cause
system noise. Verify that the hoses do not touch any
other part of the vehicle.

Loose connections may not leak, but could allow air into
the steering system. Verify that all hose connections are
tight.

IMPORTANT: Power steering fluid level must be maintained throughout

bleed procedure.

IMPORTANT: With hydro-boost only, the oil level will appear falsely high if

the hydro-boost accumulator is not fully charged. Do not
apply the brake pedal with the engine OFF. This will
discharge the hydro-boost accumulator.

2007 Hummer H3

2007 STEERING Power Steering - H3

require turns up to 15 to 20 stop to stops.

5. Verify power steering fluid level per operating specification. Refer to Checking and

Adding Power Steering Fluid.

6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or

fluid aeration (pump noise/whining).

7. Verify the fluid level. Repeat the bleed procedure, if necessary.

CHECKING AND ADDING POWER STEERING FLUID

1. Clean the area surrounding the reservoir cap.

Fig. 4: View Of Pump Reservoir Cap

NOTE:

When adding fluid or making a complete fluid change, always use
the proper power steering fluid. Failure to use the proper fluid will
cause hose and seal damage and fluid leaks.

2007 Hummer H3

2007 STEERING Power Steering - H3

Courtesy of GENERAL MOTORS CORP.

2. Remove the reservoir cap.

The bottom of the hatched area is the Add level at 21°C (70°F).

The top of the hatched area is the Cold level at 21°C (70°F).

3. Inspect the power steering pump fluid level at regular intervals, with the fluid at

approximately 21°C (70°F).

If the power steering fluid is too hot allow the fluid to cool to approximately 21°C
(70°F).

If the power steering fluid is too cold, run the engine until the fluid reaches
approximately 21°C (70°F).

4. If the fluid level is low, add power steering fluid to the proper fluid level. Refer to Fluid

and Lubricant Recommendations .

5. Install the reservoir cap.

POWER STEERING SYSTEM FLUSHING

1. Turn OFF the engine.

2. Raise the front end of the vehicle off the ground until the tires and wheels turn freely. Refer

to Lifting and Jacking the Vehicle .

3. Place a large container under the fluid return hose in order to collect the draining fluid.

4. Remove the fluid return hose at the power steering pump reservoir inlet connection.

5. Plug the reservoir return hose inlet connection on the power steering pump.

6. With the key on engine off, turn the steering wheel fully to the left and to the right while an

assistant maintains the minimum fluid level in the reservoir using new approved power
steering fluid. Continue until the fluid from the return hose runs clear.

7. Remove the plug from the pump reservoir inlet connection and install the fluid return hose

to the pump reservoir.

IMPORTANT: Do not reuse any drained power steering fluid regardless of

appearance or condition.

IMPORTANT: This step may require 4 L (4 qt) of power steering fluid until

the draining fluid appears clear.

IMPORTANT: Do NOT run the engine without the power steering fluid at a

2007 Hummer H3

2007 STEERING Power Steering - H3