Hummer H3. Manual — part 1578

2007 STEERING

Power Steering - H3

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

POWER STEERING PUMP SPECIFICATIONS

Power Steering Pump Specifications

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - POWER STEERING SYSTEM

Begin the system diagnosis by reviewing the system Description and Operation. Refer to Power
Steering System Description and Operation. Reviewing the Description and Operation
information will help you determine the correct symptom diagnostic procedure when a
malfunction exists. Reviewing the Description and Operation information will also help you

Application

Specification

Metric

English

Power Steering Gear Inlet and Outlet Hose
Retaining Plate Bolt

12 N.m

106 lb in

Power Steering Gear Inlet and Outlet Hose Bracket
Bolt

9 N.m

80 lb in

Power Steering Gear Inlet Hose Fitting

25 N.m

18 lb ft

Power Steering Pump Bolt

25 N.m

18 lb ft

Power Steering Pump Bracket Bolt

50 N.m

37 lb ft

Rack and Pinion Inner Tie Rod

88 N.m

65 lb ft

Rack and Pinion Outer Tie Rod End Nut

71 N.m

52 lb ft

Steering Gear Bolt

130 N.m

96 lb ft

Steering Gear Bracket Bolt

100 N.m

74 lb ft

Engine Code Engine Size

High Flow

(Liters per

Minute)

High Flow

(Gallons per

Minute)

Pressure

Relief (kPa)

Pressure

Relief (PSI)

L52

3.5L

9.4/10.9

2.50/2.90

9308/9997

1350/1450

2007 Hummer H3

2007 STEERING Power Steering - H3

2007 Hummer H3

2007 STEERING Power Steering - H3

determine if the condition described by the customer is normal operation. Refer to Symptoms -
Power Steering System in order to identify the correct procedure for diagnosing the system and
where the procedure is located.

SYMPTOMS - POWER STEERING SYSTEM

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the power steering
system.

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

Inspect for leaking power steering components. If necessary, refer to Power Steering Fluid
Leaks.

Verify the power steering reservoir for the proper operating specification. Refer to
Checking and Adding Power Steering Fluid.

Inspect the power steering fluid for the following indications of contamination:

Milky fluid - water

Brown fluid - burnt

Debris in fluid - plastic or dirt

If necessary, flush the power steering system. Refer to Power Steering System Flushing.

Symptoms List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Power Steering Fluid Leaks

Rattle, Clunk or Shudder Noise from the Power Steering System

Whine or Growl Noise from the Power Steering System

Steering Effort Hard in One or Both Directions

Steering Effort Too Easy in One or Both Directions

POWER STEERING SYSTEM TEST

IMPORTANT: Review the system description and operation in order to

familiarize yourself with the system functions. Refer to Power
Steering System Description and Operation.

2007 Hummer H3

2007 STEERING Power Steering - H3

Fig. 1: Testing Rack and Pinion System Pressures
Courtesy of GENERAL MOTORS CORP.

Callouts For Fig. 1

Test Description

The numbers below refer to the step numbers on the diagnostic table.

5: This step tests the system for restrictions.

7: This step tests the following components for the following conditions:

The pump for internal leaks

Callout

Component Name

1

Power Steering Return Hose

2

Power Steering Pressure Hose

2007 Hummer H3

2007 STEERING Power Steering - H3

The power steering pipes for kinks

8: This step tests the ability of the pump to regulate flow at maximum pressure.

10: This step tests the ability of the pump to regulate flow under normal operating
conditions.

12: This step tests the internal components of the pump and the gear.

Power Steering System Test

Step

Action

Value(s)

Yes

No

DEFINITION: The Power Steering System Test Procedure will perform the following
functions:

Test the operation of the hydraulic power steering system.

Test the operation of the power steering pump and power steering gear.

Identify restrictions in the system.

1

Inspect the power steering fluid for
the following indications of
contamination:

Milky fluid - water

Brown fluid - burnt

Debris in fluid - plastic or dirt

Is the fluid free of contamination?

-

Go to Step 3 Go to Step 2

2

Flush the power steering system.
Refer to Power Steering System
Flushing.
Did you complete the procedure?

-

Go to Step 3

-

3

Attempt to duplicate the condition.Is
the condition present?

IMPORTANT:

In order to accurately diagnose the
system, the malfunction must be
present during the test procedure.

-

Go to Step 4 System OK

1. Turn the ignition switch to the

OFF position.

2007 Hummer H3

2007 STEERING Power Steering - H3