Hummer H1 Service Manual page 492

________________________________________________________________________________
®
Section 8 Steering System
Intermediate Steering Shaft
Dust Boot Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .8-14
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Power Steering Pump
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-42
Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . .8-41
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-39
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-39
Steering Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-44
Steering Gear Adjustment Preload Torques . . . . . . . . . . .8-44
Steering Pump Flow Rates and Operating Pressures . . .8-44
Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-44
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
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.
05745159
TABLE OF CONTENTS
Gear Assembly and Adjustment . . . . . . . . . . . . . . . . . . . . 8-30
Gear Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . 8-28
Gear Disassembly and Overhaul . . . . . . . . . . . . . . . . . . . . 8-23
Hydraulic System Pressure . . . . . . . . . . . . . . . . . . . . . . . . 8-16
Power Steering Gear Service . . . . . . . . . . . . . . . . . . . . . . . 8-18
Pressure Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22
Pump and Pulley Replacement . . . . . . . . . . . . . . . . . . . . . 8-15
Purging Air from the System . . . . . . . . . . . . . . . . . . . . . . . 8-22
System Diagnosis Charts . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19
System Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46
Steering Column
Ignition Interlock Cable Replacement . . . . . . . . . . . . . . . 8-11
Ignition Switch Lock Cylinder . . . . . . . . . . . . . . . . . . . . . . 8-11
Lock and Switch Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
Multi-Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
Steering Column Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Steering Column Replacement . . . . . . . . . . . . . . . . . . . . . . 8-7
Steering Gear Replacement . . . . . . . . . . . . . . . . . . . . . . . . 8-12
Steering Wheel Hub/ Column Shroud . . . . . . . . . . . . . . . . 8-10
Steering Wheel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Tie Rod End Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Tie Rod Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
RESERVOIR
BRAKE
HYDRO-BOOST
POWER
STEERING
PUMP
Figure 8-1: Steering System
8-1
POWER
STEERING
GEAR
POWER
STEERING
COOLER