Hummer H2. Manual - part 2112

other?

Step 10 Step 14

10

1. Increase the engine speed to approximately 1500 RPM.  

2. Record the flow reading. Refer to Power Steering Pump 

Specifications for power steering system pressure specifications.  

Is the actual flow reading within specifications?

-

Go to 

Step 11

Go to 

Step 13

11

Is the difference between the actual flow reading and the maximum flow 
specification more than 3.8 L (1 gal) per minute?

-

Go to 

Step 16

Go to 

Step 12

12

Turn the steering wheel from steering stop to steering stop and record the 
FLOW readings at each stop.Is the flow LOWER than 3.8 L (1 gal) per 
minute?

NOTE:

Refer to Steering Wheel in the Full Turn Position Notice in Cautions 
and Notices.

-

Go to 

Step 18

Go to 

Step 17

13

Replace the power steering pump. Refer to Power Steering Pump 
Replacement . 
Did you complete the replacement?

-

Go to 

Step 18

-

14

1. Remove the power steering pump flow control valve. Refer to 

Power Steering Pump Flow Control Valve Replacement - Off 
Vehicle (Regular) .  

2. Inspect the flow control valve. 

If any burrs or scratches are noticed on the flow control valve, 
replace the flow control valve. Do NOT attempt to clean the flow 
control valve. Refer to Power Steering Pump Flow Control 
Valve Replacement - Off Vehicle (Regular) . 

3. Inspect the flow control valve bore. 

If any burrs or scratches are present in the control valve bore, 
replace the power steering pump. Refer to Power Steering Pump 
Replacement . 

Did you complete the repair?

-

Go to 

Step 18

-

15

Replace the power steering pump flow control valve. Refer to Power 
Steering Pump Flow Control Valve Replacement - Off Vehicle 
(Regular) . 
Did you complete the replacement?

-

Go to 

Step 18

-

16

1. Remove the power steering pump flow control valve and inspect 

for any wear or damage. Do NOT disassemble the flow control 
valve.  

2. If the flow control valve is worn damaged, replace the flow control 

valve. Refer to Power Steering Pump Flow Control Valve 

-

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

POWER STEERING FLUID LEAKS 

Power Steering Fluid Leaks 

Replacement - Off Vehicle (Regular) .  

Did you complete the repair?

Go to 

Step 18

-

17

The power steering gear is leaking across the piston or bypassing the 
valve circuit. Replace the power steering gear. Refer to 

Power Steering 

Gear Replacement

 . 

Did you complete the replacement?

-

Go to 

Step 18

-

18

Test the power steering system for the original condition. 
Does the original condition still exist?

-

Go to 

Step 5

Go to 

Step 19

19

1. Disconnect and remove the J 44721 from the vehicle. See Special 

Tools and Equipment .  

2. Connect the vehicle power steering pipes/hoses.  

3. Bleed the power steering system and add fluid as necessary. Refer 

to Bleeding the Power Steering System .  

Did you complete the repair?

-

System 

OK

-

Step

Action

Yes

No

1

Did you review the Power Steering System General Description 
and perform the necessary inspections?

Go to 

Step 2

Go to Symptoms - 

Power Steering 

System

2

Verify that power steering fluid leaks are present. 
Is the power steering system leaking?

Go to 

Step 3

System OK

3

Inspect the power steering system fittings. 
Are the fittings leaking?

Go to 

Step 9

Go to Step 4

4

Inspect the power steering hoses. 
Are the hoses leaking?

Go to 

Step 10

Go to Step 5

5

Inspect the power steering pump and the reservoir for leaks. 
Is the power steering pump or reservoir leaking?

Go to 

Step 11

Go to Step 6

6

Inspect the power steering gear for leaks. 
Is the power steering gear leaking?

Go to 

Step 12

Go to Step 7

7

Inspect the hydraulic brake booster assembly for leaks. 
Is the hydraulic brake booster assembly leaking?

Go to 

Step 13

Go to Step 8

8

Inspect the power steering cooler for leaks. 
Is the power steering cooler leaking?

Go to 

Step 14

Go to Step 3

9

Tighten the fittings. Refer to Fastener Tightening 
Specifications . 
Did you complete the repair?

Go to 

Step 15

-

Replace the power steering hoses. Refer to the appropriate 
procedure(s): 

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

RATTLE, CLUNK, OR SHUDDER NOISE FROM THE POWER STEERING SYSTEM 

Rattle, Clunk, or Shudder Noise from the Power Steering System 

10

z

Power Steering Cooler Replacement  

z

Power Steering Gear Inlet Pipe/Hose Replacement  

z

Power Brake Booster Inlet Hose Replacement  

z

Power Brake Booster Outlet Hose Replacement  

 
Did you complete the repair?

Go to 

Step 15

-

11

Replace the power steering pump or reservoir. Refer to Power 
Steering Pump Replacement or Power Steering Reservoir 
Replacement - Off Vehicle . 
Did you complete the repair?

Go to 

Step 15

-

12

Replace the power steering gear. Refer to Power Steering Gear 
Replacement . 
Did you complete the repair?

Go to 

Step 15

-

13

Replace the hydraulic brake booster assembly. Refer to 
Hydraulic Brake Booster Replacement in Hydraulic Brakes. 
Did you complete the repair?

Go to 

Step 15

-

14

Replace the power steering cooler. Refer to Power Steering 
Cooler Replacement . 
Did you complete the repair?

Go to 

Step 15

-

15

Operate the system in order to verify the repair. 
Did you correct the condition?

System 

OK

Go to Step 3

Step 

or

Action

Yes

No

1

Did you review the Power Steering System General Description 
and perform the necessary inspections?

Go to 

Step 2

Go to Symptoms - 

Power Steering 

System

2

Verify that a rattle, clunk or shudder noise is present. 
Is a rattle, clunk or shudder noise present?

Go to 

Step 3

System OK

3

Inspect the power steering hoses for proper routing and clearance. 
Is the routing or clearance of the power steering hoses incorrect?

Go to 

Step 11

Go to Step 4

4

Inspect the engine drive belt for cracking or excessive wear. Refer 
to Drive Belt Replacement - Accessory in Engine Mechanical. 
Is the drive belt cracked or excessively worn?

Go to 

Step 12

Go to Step 5

5

Inspect the power steering pump pulley for damage. 
Is the power steering pump pulley damaged?

Go to 

Step 13

Go to Step 6

6

Inspect the power steering pump and the power steering mounting 
bracket/brace for the proper installation. Refer to Power Steering 
Pump Replacement . 
Is the power steering pump installation incorrect?

Go to 

Step 14

Go to Step 7

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2

  

7

Inspect the power steering gear for the proper installation. Refer to 
Power Steering Gear Replacement . 
Is the power steering gear installation incorrect?

Go to 

Step 15

Go to Step 8

8

Inspect the steering linkage. Refer to Steering Linkage Inspection 
in Steering Linkage. 
Is the steering linkage worn?

Go to 

Step 17

Go to Step 9

9

Inspect the suspension. 
Is the suspension worn?

Go to 

Step 17

Go to Step 10

10

Inspect the intermediate shaft. 
Is the intermediate shaft worn?

Go to 

Step 18

Go to Step 3

11

Adjust or replace the hoses. Refer to the appropriate procedure(s): 

z

Power Steering Cooler Replacement  

z

Power Steering Gear Inlet Pipe/Hose Replacement  

z

Power Brake Booster Inlet Hose Replacement  

z

Power Brake Booster Outlet Hose Replacement  

 
Did you complete the repair?

Go to 

Step 19

-

12

Replace the engine drive belt. Refer to Drive Belt Replacement - 
Accessory in Engine Mechanical. 
Did you complete the repair?

Go to 

Step 19

-

13

Replace the power steering pump pulley. Refer to Power Steering 
Pulley Replacement . 
Did you complete the repair?

Go to 

Step 19

-

14

Install the power steering pump correctly. Refer to Power Steering 
Pump Replacement . 
Did you complete the repair?

Go to 

Step 19

-

15

Install the power steering gear correctly. Refer to Power Steering 
Gear Replacement . 
Did you complete the repair?

Go to 

Step 19

-

16

Replace the worn steering linkage. Refer to Steering Linkage 
Inspection in Steering Linkage. 
Did you complete the repair?

Go to 

Step 19

-

17

Replace the worn suspension components. Refer to Diagnostic 
Starting Point - Suspension General Diagnosis in Suspension 
General Diagnosis. 
Did you complete the repair?

Go to 

Step 19

-

18

Replace the intermediate shaft. Refer to Intermediate Steering 
Shaft Replacement - Upper or Intermediate Steering Shaft 
Replacement - Lower in Steering Wheel and Column. 
Did you complete the repair?

Go to 

Step 19

-

19

Operate the system in order to verify the repair. 
Did you correct the condition?

System 

OK

Go to Step 3

 

2004 Hummer H2 

2004 STEERING Power Steering System - Hummer H2