Hummer H1 Service Manual page 493

8-2 Steering System
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).
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
1. Raise and support the front of the vehicle.
2. 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.
3. Remove the cotter pin and slotted nut from the center link
end of the pitman arm.
4. Using puller J–24319–B or equivalent, remove the pitman
arm from the center link.
5. 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.
4-1-00
___________________________________________________________
The tie
STEERING ARM
SLOTTED NUT
CENTER LINK
Figure 8-2: Steering (Pitman) Arm Removal
Installation
1. 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).
2. Secure the pitman arm to the center link with the slotted
nut. Tighten the slotted nut to 80 lb-ft (108 N•m).
3. 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.
4. Place the wheels in the straight ahead position and tighten
the idler arm to frame bolts to 60 lb-ft (81 N•m).
5. Lubricate the pitman arm and lower the vehicle.
®
STEERING
GEAR
SHAFT