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Hummer H1 (2002+). Manual - part 123

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Brake System 7-51

05745159

ESSENTIAL TOOLS

Procure from Kent-Moore.

8-S07-001

J–42553

9-S07-016

1 0

1 5

2 0

2 5

3 0

3 5

1 4

1 9

2 4

2 9

3 4

1 3

1 8

2 3

2 8

3 3

1 2

1 7

2 2

2 7

3 2

1 1

1 6

2 1

2 6

3 1

J 3

5 5

9 2

P I

N O

U T

O X

J–35592

00-S07-001

00-S07-002

J-44237

J-42883

Tool No.

Description

J–42553

Disc Brake Piston Retraction Tool

J–35592

ABS Pinout Box

J–44237

ABS Blink Code Jumper

J–44238

Master Cylinder Bleed Adapter (not shown)

J–42883

Wheel Speed Sensor Test Cable

J–29532

Brake Pressure Bleeder (not shown)

3-1-01

7-52

Brake System

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THIS PAGE INTENTIONALLY BLANK.

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8-1

05745159

Section 8 Steering System

TABLE OF CONTENTS

Intermediate Steering Shaft

Dust Boot Replacement  . . . . . . . . . . . . . . . . . . . . . . . . . . .8-14
Installation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Removal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Replacement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13

Power Steering Pump

Steering System

Center Link Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Essential Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
Idler Arm Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6
Pitman Arm Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2

Power Steering

Cooler and Hose Replacement . . . . . . . . . . . . . . . . . . . . . .8-17
Fluid Reservoir Replacement . . . . . . . . . . . . . . . . . . . . . . .8-16
Gear Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46
Steering Column

Steering Wheel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Tie Rod End Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Tie Rod Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

STEERING SYSTEM DESCRIPTION

The power steering system consists of the power steering
pump, reservoir, steering gear, fluid cooler, and interconnect-
ing lines (Figure 8-1). The purpose of the system is to reduce
steering effort at all vehicle speeds and during parking maneu-
vers.

The steering pump used on all models is a constant displace-
ment, rotary pump. The pump supplied by Delphi Saginaw
Steering Systems uses a remote reservoir (Figure 8-1).

The steering pump on all Hummer vehicles performs two func-
tions. The first function is to provide the necessary fluid pres-
sure for power brake boost to the hydro-boost unit. The second
is to provide fluid pressure for steering assist.

A recirculating ball-type steering gear is used for all applica-
tions. The gear is also supplied by Delphi Saginaw Steering
Systems.

A steering fluid cooler is used on all Hummer models. The ver-
tical mount cooler is located at the driver side of the fan
shroud.

Figure 8-1: Steering System

BRAKE

HYDRO-BOOST

POWER

STEERING

COOLER

POWER

STEERING

PUMP

POWER

STEERING

GEAR

RESERVOIR

8-2

Steering System

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Power Steering Fluid

Recommended fluid for the power steering system is Dexron III.

Power Steering Component Service

Most of the power steering pump components are not service-
able. The seals and the flow control valve, however, can be
serviced. The pump can also be replaced as an assembly.

The steering gear can be removed and overhauled when re-
quired. Refer to the overhaul procedure in this section.

The fluid coolers and fluid lines are also replaced as assemblies
when diagnosis indicates this is necessary.

Steering Linkage

The steering linkage consists of a steering (Pitman) arm, center
link, idler arm, and left/right tie rods (Figure 8-3). The tie
rods connect the center link to steering arms on the left and
right side geared hubs. The idler arm stabilizes the center link
and is attached to the vehicle frame. The steering arm connects
the center link to the steering gear.

Steering Linkage Lubricant

Recommended lubricant for linkage lubrication points is
NLGI-LB grade lubricating grease. Quality lubricants are
available from suppliers such as Mobil, Kendall, and Valvo-
line.

STEERING (PITMAN) ARM REPLACEMENT

NOTE:

Ensure front wheels are in straight-ahead position

while steering arm is removed and installed.

Removal

Raise and support the front of the vehicle.

Remove the nut and lock washer from the steering gear
shaft (Figure 8-2). Using puller J–42548, remove the
pitman arm from the steering gear shaft.

Remove the cotter pin and slotted nut from the center link
end of the pitman arm.

Using puller J–24319–B or equivalent, remove the pitman
arm from the center link.

Loosen the idler arm to frame mount bolts to allow
movement of the idler arm when the pitman arm is
tightened to the center link.

Figure 8-2: Steering (Pitman) Arm Removal

Installation

Secure the pitman arm to the steering gear shaft with the
lock washer and nut. Tighten the nut to 185 lb-ft
(251 N•m).

Secure the pitman arm to the center link with the slotted
nut. Tighten the slotted nut to 80 lb-ft (108 N•m).

Install the cotter pin through the slotted nut. If necessary,
tighten the slotted nut to align the holes for cotter pin
insertion. DO NOT back off the slotted nut to align the
holes.

Place the wheels in the straight ahead position and tighten
the idler arm to frame bolts to 60 lb-ft (81 N•m).

Lubricate the pitman arm and lower the vehicle.

STEERING ARM

STEERING

CENTER LINK

GEAR

SHAFT

SLOTTED NUT

4-1-00

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