Hummer H1 (2006+). Manual - part 253

8-28

Steering System

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3.

Install the two clamps on the return hose and the control valve hose. Secure the return hose, control valve hose and the two
clamps together with the bolt, washer and the locknut.

4.

Install the harness clamp and the two clamps on the power steering line bracket with the bolt, two washers and the locknut.

5.

Purge the air from the power steering system. Refer to  “Purging Air From the Power Steering System” on page 8–35 .

Figure 8-27:   Power Steering Hose Replacement at Brake Hydro-Boost

Figure 8-28:   Power Steering Hose Replacement at the Steering Gear

POWER STEERING FLUID RESERVOIR REPLACEMENT

Removal

1.

Suction the power steering fluid from the reservoir.

2.

Loosen the hose clamps and disconnect the power steering hoses from the reservoir (Figure  8-29).

3.

Remove the two bolts and washers securing the reservoir to the bracket and remove the reservoir.

Installation

1.

Secure the reservoir to the bracket using the two washers and bolts.

2.

Secure the two power steering hoses to the reservoir using the hose clamps.

3.

Fill the reservoir and purge the air from the power steering system.

4.

Start the engine and check for leaks.

PRESSURE

HYDRO-BOOST

O-RING SEALS

RETURN HOSE

 HOSE

PRESSURE HOSE

STEERING 

GEAR

RETURN HOSE

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 Steering System  8-29

5745804

Figure 8-29:   Reservoir Replacement

POWER STEERING COOLER AND COOLER HOSE REPLACEMENT 

Removal

1.

Loosen the clamps and disconnect the two hoses from the cooler, one from the gear box and one from the power steering 
pump. (Figure  8-30).

2.

Remove the hoses through the fender opening.

3.

Remove the two bolts and washers from the power steering cooler.

4.

Remove the cooler.

Installation

1.

Secure the power steering oil cooler with the two bolts (Figure  8-30).

2.

Connect the hoses to the cooler and secure with the clamps.

3.

Purge the air from the system.

RESERVOIR

POWER

STEERING

PUMP

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8-30

Steering System

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Figure 8-30:   Power Steering Cooler and Cooler Hoses 

POWER

STEERING

COOLER

POWER

STEERING

GEAR

POWER

STEERING

PUMP

POWER STEERING 

FLUID RESSERVOIR 

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 Steering System  8-31

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POWER STEERING SYSTEM DIAGNOSIS CHARTS

The diagnosis charts are guidelines to potential system faults. The charts list potential faults in order of probability (most probable
to least probable).

While the charts outline common faults, they may not cover all possible problem causes. Inspection and diagnosis with analyzer set
J–44721 should be used to confirm a pump or gear problem. 

 Power Steering Diagnosis Chart - part 1

Problem

Possible Cause

Correction

Poor Return of Steering

1.

Tires under-inflated.

1.

Inflate to specified pressure.

2.

Lower coupling flange rubbing against 
the steering gear adjuster plug.

2.

Loosen the pinch bolt and assemble
properly.

3.

Steering wheel rubbing against direc-
tional signal housing.

3.

Adjust the steering jacket.

4.

Binding steering linkage, or ball joints.

4.

Replace the affected parts.

5.

Steering gear to column misalignment.

5.

Align the column.

6.

Tie rod not centralized.

6.

Adjust tie rod ends as required.

7.

Lack of lubricant in the suspension ball 
joints and steering linkage.

7.

Lubricate.

8.

Stuck or plugged valve spool.

8.

Replace the steering gear.

9.

Improper front wheel alignment.

9.

Check and adjust to specifications.

10. Steering gear adjusted too tightly.

10. Replace the steering gear.

11. Kink in return hose.

11. Replace the hose.

Steering Wheel Surges or Jerks 
When Turning With Engine Run-
ning Especially During Parking

1.

Low oil level in pump.

1.

Add power steering fluid as required.

2.

Loose pump drive belt.

2.

Adjust bolt.

3.

Sticky flow control valve.

3.

Replace pump.

4.

Insufficient pump pressure.

4.

Test system with analyzer. 

Hard Steering Effort in Both 
Directions

1.

 Low tire pressure.

1.

 Adjust the tire pressure.

2.

Lack of lubricant in suspension or ball 
joints (Worn/contaminated joints).

2.

Lubricate and relubricate at proper
intervals or replace joints.

3.

Binding of steering linkage, or ball 
joints. 

3.

Replace all affected parts.

4.

Steering gear to column misalignment.

4.

Align the steering column.

5.

Pump belt slipping. 

5.

Adjust belt.

6.

Low fluid level in reservoir.

6.

Fill to proper level. Inspect lines and
joints for external leakage.

7.

High internal leakage (steering gear or 
pump).

7.

Test system with analyzer.

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