Hummer H3. Manual — part 1579

4

2. Place a drain pan under the

vehicle in order to catch any
power steering fluid.

3. Disconnect the power steering

pressure pipe/hose from the
power steering pump or the
power steering gear as
necessary.

4. Install the J 44721 Power

Steering System Analyzer.

5. Fill the power steering system.

Refer to Checking and
Adding Power Steering
Fluid.

Did you complete the installation?

-

Go to Step 5

-

5

1. Fully open the J 44721 valve.

2. Start the engine.

3. Turn the steering wheel and

BRIEFLY hold the steering
wheel against the steering stop
in order to release any trapped
air from the system.

4. Inspect and ensure that all of

the power steering pipe/hose
connections are not leaking.

5. Observe the pressure reading.

Is the pressure reading greater than
the specified value?

NOTE:

Refer to STEERING WHEEL IN
THE FULL TURN POSITION
NOTICE .

1379 kPa

(200 psi)

Go to Step 6 Go to Step 7

IMPORTANT:

A restriction may be present in the

2007 Hummer H3

2007 STEERING Power Steering - H3

6

Locate and repair the restriction.Did
you complete the repair?

power steering system. Turn off the
engine IMMEDIATELY.

-

Go to Step

15

-

7

1. Allow the engine to run until

the engine reaches full
operating temperature.

2. Record the pressure reading

and flow reading.

3. Partially close the J 44721

valve until the system pressure
reaches the specified value,
then record the FLOW
reading.

4. Subtract second flow reading

from the first flow reading.

Is the flow DECREASE greater than
3.8 L (1 gal) per minute?

4827 kPa

(700 psi)

Go to Step

13

Go to Step 8

8

Fully close then open the J 44721
valve 3 times. Record all of the high
pressure readings. Refer to Power
Steering Pump Specifications for
power steering system pressure relief
specifications.Are the three high
pressure readings within
specifications?

NOTE:

Do not leave the valve fully closed for
more than 5 seconds or the pump
could be damaged internally.

-

Go to Step 9

-

9

Are the three high pressure readings
within 245 kPa (50 psi) of each
other?

-

Go to Step

10

-

1. Increase the engine speed to

approximately 1500 RPM.

2007 Hummer H3

2007 STEERING Power Steering - H3

10

2. Record the flow reading. Refer

to Power Steering Pump
Specifications for power
steering system pressure
specifications.

Is the actual flow reading within
specifications?

-

Go to Step

11

Go to Step

13

11

Is the difference between the actual
flow reading and the maximum flow
specification more than 3.8 L (1 gal)
per minute?

-

-

Go to Step

12

12

Turn the steering wheel from
steering stop to steering stop and
record the FLOW readings at each
stop.Is the flow LOWER than 3.8 L
(1 gal) per minute?

NOTE:

Refer to STEERING WHEEL IN THE
FULL TURN POSITION NOTICE .

-

Go to Step

15

Go to Step

14

13

Replace the power steering pump.
Refer to Power Steering Pump
Replacement (LLR).
Did you complete the replacement?

-

Go to Step

15

-

14

The power steering gear is leaking
across the piston or bypassing the
valve circuit. Replace the power
steering gear. Refer to Steering
Gear Replacement.
Did you complete the replacement?

-

Go to Step

15

-

15

Test the power steering system for
the original condition.
Does the original condition still
exist?

-

Go to Step 5

Go to Step

16

1. Disconnect and remove the J

44721 from the vehicle.

2. Connect the vehicle power

2007 Hummer H3

2007 STEERING Power Steering - H3

POWER STEERING FLUID LEAKS

Power Steering Fluid Leaks

16

steering pipes/hoses.

3. Bleed the power steering

system and add fluid as
necessary. Refer to Power
Steering System Bleeding.

Did you complete the repair?

-

System OK

-

Step

Action

Yes

No

1

Did you review the Power Steering System
General Description and perform the
necessary inspections?

Go to Step 2

Go to Symptoms

- Power

Steering System

2

Verify that power steering fluid leaks are
present.
Is the power steering system leaking?

Go to Step 3

System OK

3

Inspect the power steering system fittings.
Are the fittings leaking?

Go to Step 7

Go to Step 4

4

Inspect the power steering hoses.
Are the hoses leaking?

Go to Step 8

Go to Step 5

5

Inspect the power steering pump and the
reservoir for leaks.
Is the power steering pump or reservoir
leaking?

Go to Step 9

Go to Step 6

6

Inspect the power steering gear for leaks.
Is the power steering gear leaking?

Go to Step 10

-

7

Tighten the fittings. Refer to Fastener
Tightening Specifications.
Did you complete the repair?

Go to Step 11

-

8

Replace the power steering hoses. Refer to
Power Steering Gear Inlet and Outlet
Hose Replacement.
Did you complete the repair?

Go to Step 11

-

9

Replace the power steering pump. Refer to
Power Steering Pump Replacement
(LLR).

-

2007 Hummer H3

2007 STEERING Power Steering - H3