Hummer H2. Manual - part 2137

Fig. 88: Connecting The Adjuster Nut Assembly To The Steering Gear Housing 
Courtesy of GENERAL MOTORS CORP. 

4. Connect the adjuster nut assembly (2) to the steering gear housing (1) using J 42882 . See Special Tools 

and Equipment .  

5. Install the coupling shield retainer and the lock nut (1) to the adjuster nut assembly.  

6. Refer to Worm Thrust Bearing Preload Adjustment - Off Vehicle (700 Gear) to adjust the thrust 

bearing preload. 

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

Fig. 89: Tightening Coupling Shield Retainer & Lock Nut Using J 43435 & Torque Wrench 
Courtesy of GENERAL MOTORS CORP. 

7. Hold the adjuster nut assembly in position to maintain alignment of the marks. 

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

8. Tighten the coupling shield retainer and the lock nut using J 43435 and a torque wrench. 

Tighten: Tighten the retainer and the lock nut to 109 N.m (80 lb ft). 

DESCRIPTION AND OPERATION 

POWER STEERING SYSTEM DESCRIPTION AND OPERATION 

The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure 
and flow for the power steering gear. The hydraulic power steering pump is belt-driven. 

The power steering fluid reservoir holds the power steering fluid. 

In the recirculating ball system, a worm gear converts steering wheel movement to movement of a sector shaft. 
A pitman arm attached to the bottom of the sector shaft moves an intermediate rod assembly. This assembly 
consists of inner and outer tie rod ends that are replaceable independent of each other. 

The power steering pressure hose connects the power steering pump union fitting to the power steering gear and 
allows pressurized power steering fluid to flow from the pump to the gear. 

The power steering return hose returns fluid from the power steering gear back to the power steering fluid 
reservoir. The power steering return line contains an integral fin-type power steering fluid cooler. 

In a typical power steering system, a pump generates hydraulic pressure, causing fluid to flow, via the pressure 
hose, to the steering gear valve assembly. The steering gear valve assembly regulates the incoming fluid to the 
right and left chambers in order to assist in right and left turns. 

Turning the steering wheel activates the valve assembly, which applies greater fluid pressure and flow to one 
side of the steering gear piston, and lower pressure and flow to the other side of the piston. The pressure assists 
the movement of the gear piston. Tie rods transfer this force to the front wheels, which turn the vehicle right or 
left. 

SPECIAL TOOLS AND EQUIPMENT 

SPECIAL TOOLS 

Special Tools 

Illustration

Tool Number/Description

J 4245 

Internal Snap Ring Pliers

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

J 6278 

Pitman Shaft Bearing Remover and Installer

J 8947 

Rack Piston Teflon Ring Compression

J 21552 

Rack Piston Arbor

J 25033-C 

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2