Hummer H1 (2006+). Manual — part 246
7-66
Brake System
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THIS PAGE INTENTIONALLY BLANK.
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8-1
5745804
Section 8 Steering System
TABLE OF CONTENTS
Cylinder Head O-Ring Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
Input Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22
Intermediate Steering Shaft
Dust Boot Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-25
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-25
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-25
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-25
Steering Gear Seal Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-21
Steering Specifications
Steering Pump Flow Rates and Operating Pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-37
Steering System
Center Link Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Essential Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-38
Idler Arm Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
Pitman Arm Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Power Steering
Cooler and Hose Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-29
Fluid Reservoir Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-28
Hydraulic System Pressure and Return Hose Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-27
Power Steering Gear Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-31
Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-35
Pump and Pulley Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-26
Purging Air from the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-35
System Diagnosis Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-31
System Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-37
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-38
Steering Column
Ignition Interlock Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-18
Ignition Switch Lock Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-16
Lock and Switch Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Multi-Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-12
Steering Column Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-14
Steering Column Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-11
Steering Gear Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-19
Steering Wheel Hub/ Column Shroud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-16
Steering Wheel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10
Tie Rod End Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6
Tie Rod Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8
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8-2
Steering System
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STEERING SYSTEM DESCRIPTION
The power steering system consists of the power steering pump, reservoir, steering gear, fluid cooler, and interconnecting lines
(Figure 8-1). The purpose of the system is to reduce steering effort at all vehicle speeds and during parking maneuvers.
The steering pump used on all models is a constant displacement, rotary pump. The pump supplied by Delphi Saginaw Steering
Systems uses a remote reservoir (Figure 8-1).
The steering pump on all HUMMER H1 vehicles performs two functions. 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 applications. The gear is supplied by the Sheppard Company.
A steering fluid cooler is used on all models. The vertical mount cooler is located on the drivers side front hood hinge mount.
Figure 8-1: Steering System
Power Steering Fluid
Recommended fluid for the power steering system is Dexron III.
Power Steering Component Service
Most of the power steering components are serviceable. The pump can be replaced as an assembly.
The steering gear housing seals are serviceable with the exception of the sector shaft seal that requires unit replacement. Mechani-
cal failure of the steering gear components require unit replacement
The fluid cooler 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 at-
tached 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 Valvoline.
POWER
STEERING
COOLER
POWER STEERING PUMP
POWER
STEERING
GEAR
RESERVOIR
BRAKE HYDRO-BOOST
10-1-08
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Steering System 8-3
5745804
STEERING (PITMAN) ARM REPLACEMENT
NOTE: Ensure that the front wheels are in the straight-ahead position while the pitman arm is removed and installed.
Removal
1.
Raise and support the front of the vehicle.
2.
Remove the drive line protection.
3.
Remove the four 17mm sway bar to frame bolts and move the bar for clearance.
4.
Lift the locking tabs on the steering gear shaft bolt.
5.
Remove the 14mm socket head bolt from the steering gear shaft (Figure 8-2). Using puller CH-47965, remove the pitman arm
from the steering gear shaft.
6.
Remove the cotter pin and slotted nut from the center link end of the pitman arm.
7.
Using puller CH-47975, remove the pitman arm from the center link.
8.
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
1.
Apply anti-seize compound to the threads of the 14mm socket head bolt and both sides of the friction washer.
2.
Align the arrows on the gear box and pitman arm, install the pitman arm on the shaft with the 14mm socket head bolt.
3.
Secure the pitman arm to the steering gear shaft with the 14mm allen bolt. Tighten the bolt to 225 lb-ft (305 N•m).
4.
If the locking tabs do not line up when proper torque is reached, continue to tighten bolt until the tabs line up. DO NOT loosen
the bolt to align the tabs.
5.
Bend the tabs into the retainer (Figure 8-21).
NOTE: Refer to torque adapter in section 8 for proper use of tool J-45764-2.
6.
Secure the pitman arm to the center link with the slotted nut. Tighten the slotted nut to 110-130 lb-ft (149-176 N•m) using
torque adapter J-45764-2 and an extension (Figure 8-5).
7.
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.
8.
Place the wheels in the straight ahead position and tighten the idler arm to frame bolts to 90-100 lb-ft (122-136 N•m).
9.
Install the sway bar bolts and torque to 60 lb-ft (81 N•m).
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