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Hummer H1 (2002+). Manual - part 134

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Steering System 8-43

05745159

12. Install O-ring seal in center groove in pump body

(Figure 8-80).

13. Install pressure plate spring in pump body.

14. Install end plate and retaining ring in pump body.

Figure 8-80: End Plate Installation

15. Install magnet in pump body (Figure 8-81).

16. Install O-ring seal into control valve cavity and two O-ring

seals into threaded holes.

Figure 8-81: “O” Ring Installation

17. Install O-ring seal on pump body (Figure 8-82).

18. Install housing on pump body.

Figure 8-82: “O” Ring Installation

19. Install two mounting studs on pump assembly. Tighten

studs to 35 N.m 26 Ib-ft) (Figure 8-83).

20. Install valve spring and flow control valve in pump body.

21. Install O-ring seal and fitting assembly in pump body.

Tighten fitting in pump body to 50 N.m (37 Ib-ft.).

22. Install power steering pump, pulley and bracket.

Figure 8-83: Final Assembly

RETAINING RING

END PLATE

O-RING SEAL

PUMP BODY

PRESSURE PLATE SPRING

O-RING SEAL

CONTROL VALVE CAVITY

O-RING SEAL

THREADED HOLE

PUMP BODY

O-RING SEAL

THREADED HOLE

7-S08-063

MAGNET

HOUSING

O-RING SEAL

PUMP BODY

7-S08-062.2

HOUSING

MOUNTING STUD

VALVE SPRING

PUMP

FLOW CONTROL VALVE

O-RING SEAL

FITTING ASSEMBLY

BODY

PUMP ASSEMBLY

4-1-00

8-44

Steering System

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POWER STEERING SYSTEM FLUSHING

The power steering system can be flushed but only when the
fluid does not contain metal particles, foreign material, or de-
bris from a gear or pump failure. Flushing is recommended
only under the following circumstances:

• incorrect fluid added to system

• system filled with incorrect fluid

• water in the fluid

• burned, overheated fluid

Flushing Procedure

Raise front wheels just enough for them to turn freely.

Disconnect fluid return line at pump. Then plug pump
return port with rubber cap and hose clamp.

Position and secure pump return line in drain pan.

Have container of fresh power steering fluid handy. Pump
reservoir will need refilling as old fluid is pumped into
drain pan.

Start and run the engine at curb idle speed.

Have helper slowly turn steering wheel back and forth
about 3/4 turn in each direction.

Continue procedure until only fresh fluid comes out of
return line.

Stop engine, reconnect pump return line, and add power
steering fluid as needed.

Purge air from system. Refer to procedure in this section.

10. Stop engine and check fluid level and condition. Repeat

flushing procedure if any old fluid is still evident in
reservoir fluid.

STEERING SPECIFICATIONS

Recommended fluid is Dextron III.

Steering Gear Adjustment Preload Torques

Wormshaft bearing ..................... 6 to 15 lb-in (0.7 to 1.7 N•m)

Pitman shaft overcenter .............. 6 to 10 lb-in (0.7 to 1.1 N•m)

NOTE: Overcenter preload is in addition to wormshaft bearing
preload. For example, overcenter preload should produce a
combined final torque ranging from 12 to 25 inch-pounds.

Torque Specifications

Adjuster Plug Locknut................................. 80 lb-ft (109 N•m)

Adjuster Screw Locknut ................................ 35 lb-ft (47 N•m)

Ball Guide Clamp Bolts................................. 36 lb-ft (49 N•m)

Pressure Hose Fittings (at gear)..................... 25 lb-ft (34 N•m)

Rack Piston Plug........................................ 111 lb-ft (150 N•m)

Side Cover Bolts............................................ 44 lb-ft (60 N•m)

Steering Pump Flow Rates and Operating
Pressures

Minimum Flow Rate In Gallons/Liters Per Minute = 1.32 gpm
(5.0 liters/min) @ 465 rpm

Maximum Flow Rate In Gallons/Liters Per Minute = 3.1 to 3.5
gpm (11.7 to 13.2 liters/min) @ 1500 rpm

Minimum Pump Output Pressure 1200 psi (8274 kPa)

Maximum Pump Output Pressure: 1,475 - 1,515 psi (10,170 -
10,446 kPa)

NOTE: Pump output pressures are controlled by the pump re-
lief valve setting

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Steering System 8-45

05745159

ESSENTIAL TOOLS

Procure from Kent-Moore.

Tool

Description

J–24319-B

Steering Linkage and Tie-Rod Puller

J–25033-C

Pump Pulley Installer

J–33141

Adapter Fittings (used with J–25323)

J–25034-C

Pump Pulley Remover

J–25323

Power Steering System Analyzer

J–42548

Puller, Pitman Arm

J–8092

Universal Driver Handle

–

25033-C

–

25034-C

–

25323

–

33141

–

42548

–

24319-B

–

8092

8-46

Steering System

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SPECIAL TOOLS

Procure from Kent-Moore.

Tool

Description

J–6219

Pitman Shaft Seal Installer

J–6221

Stub Shaft Bearing and Seal Remover/Installer

J–6278 (or J–21551)

Pitman Shaft Bearing Remover/Installer

J–7624

Spanner Wrench (Adjuster Plug)

J–7754-C

Inch-Pound Torque Wrench (Over-Center Preload)

J–21552

Rack Piston Arbor

–

4245

–

6219

–

6221

–

6278 or J

–

21551

–

7624

–

7754-C

–

8092 or J

–

7079

–

21552

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