Hummer H1 (2006+). Manual - part 251

8-20

Steering System

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Align the steering gear with the mounting holes in the frame and secure with the reinforcement bracket, three lock washers,
bolts, two flat washers and the spacer (Figure 8-19). Hand start all three bolts to ensure proper thread engagement and tighten
the bolts to 160-190 lb-ft (220-260 N•m).

Align the hole in the yoke with the notch on the steering gear splines and slide the intermediate shaft on the steering gear
splines.

Insert the bolt in the yoke and tighten the locknut to 60 lb-ft (81 N•m).

Connect the two power steering lines to the steering gear and tighten to 20 lb-ft (28 N•m)

NOTE: Ensure the front wheels are in the straight ahead position.

Apply anti-seize compound to the threads of the 14mm socket head bolt and both sides of the friction washer. Align the arrows
on the gear box and pitman arm, and install the pitman arm on the shaft with the 14mm socket head bolt.

Tighten the bolt to 225 lb-ft (251 N•m). If locking tabs do not line up when proper torque is reached, continue to tighten the
bolt until the tabs line up. DO NOT loosen the bolt to align the tabs.

Bend the tabs into the retainer (Figure 8-21).

Fill the power steering reservoir.

10. Purge the air from the power steering system (Refer to section 8)

11. Inspect the wheel alignment and set the internal limit plungers (Refer to section 8).

Figure 8-19: Gear Box Mounting Hardware

UPPER BOLT

LOCK WASHER

SPACER

REINFORCEMENT

BRACKET

GEAR BOX

LOCK WASHER

FLAT WASHER

LOWER BOLT

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Steering System 8-21

5745804

Figure 8-20: Pitman Arm Removal

Figure 8-21: Locking Tab

STEERING GEAR SEAL REPLACEMENT

1. Remove the steering gear from the vehicle following the procedure outlined previously.

2. Inspect the steering gear fasteners and the steering gear for any damage to threads or mounting points that would render the

unit unsafe for installation after seal replacement. Should any such damages be noted on inspection, the appropriate repairs
or replacement of the steering gear should be performed prior to installation of the steering gear.

NOTE: Do Not Move The Piston Or Rotate The Input Shaft Of The Steering Gear After Removal Of Either The Input End Cap Or
The Cylinder Head Cap. Movement Of These Components May Damage The Internal Control Valve Assembly Requiring Re-
placement Of The Unit.

SHAFT

STEERING

ARM

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8-22

Steering System

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INPUT SEAL REPLACEMENT

3. Mark the input end cap and the steering gear housing to enable proper orientation of the cap to the steering gear when

assembling the unit after replacing the seals.

4. Remove the input shaft dust boot (See Figure 8-22).

5. Remove the limit plunger adjustment access plug.

6. Remove the input end cap by removing the four retaining bolts and removing the input end cap.

Figure 8-22: Input Cap and Seals

7. Place the input cap on a clean work surface and gently pry the salt seal out of the cap.

8. Press the oil seal out of the end cap with a suitable size socket or seal driver. Use of an arbor press is recommended.

9. Remove the cap-to-housing o-ring seal from the cap.

10. Clean and inspect the cap for any damage to the seal or o-ring sealing surfaces.

11. Press the new oil seal into position with the proper size seal driver or socket.

12. Install the new salt seal with the seal driver or socket until flush with the edge of the end cap.

13. Place the new cap o-ring seal onto the cap.

14. Wrap the input shaft splines with a piece of tape to protect the seals from any burrs or nicks in the input shaft splines.

15. Lightly grease the new o-ring and shaft seals with grease.

16. Install the input cap onto the housing, aligning the marks previously made.

17. Secure the cap to the steering gear housing with the previously removed bolts, torque the bolts to 53-64 lb.ft. (72-87 N•m).

Remove the protective tape and install the new input shaft dust boot.

18. Counting the number of turns, remove the travel limit plunger from the end cap and install a new o-ring onto the plunger and

lubricate the o-ring with grease.

19. Install the travel limit plunger, do not install any farther then the previously noted number of turns to ease in final

adjustments.

DUST BOOT

SALT SEAL

INPUT CAP

BOLT

LIMIT PLUNGER

ACCESS PLUG

LIMIT PLUNGER

O-RING SEAL

INPUT CAP

O-RING SEAL

OIL SEAL

STEERING GEAR

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Steering System 8-23

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CYLINDER HEAD O-RING REPLACEMENT

20. Mark the cylinder head and the steering gear housing to enable proper orientation of the cylinder head to the gear housing

when assembling the unit after replacing the seals.

21. Remove the limit plunger adjustment access plug.

22.

Remove the input shaft end play adjustment cap and loosen the lock nut to allow easier removal of the thrust button (See

Figure 8-23)

Figure 8-23: Cylinder Head Components

23. Remove the six bolts and lock washers retaining the cylinder head to the steering gear housing and remove the cylinder

head.

24. Remove the input shaft end play thrust button by turing the adjustment screw in to push the thrust button out of the cap.

Count the number of turns required to push the cap out. After the thrust button is forced out of the cap, back the adjustment
screw out one more turn than the number of turns noted to allow clearance for assembly.

25. Remove the cylinder head to housing and thrust button o-ring seals.

26. Clean and inspect the sealing surfaces of the housing, thrust button, and the cylinder head.

27. Lubricate the new o-ring seal with grease and install the o-ring seal on the cylinder head.

28. Lubricate the new o-ring seal with grease and install the o-ring seal on the thrust button.

29. Push the thrust button into the cap with the indentation against the adjustment screw.

30. Install the cylinder head onto the housing, aligning the marks previously made.

31. Secure the cylinder head with the previously removed bolts and lock washers, torque the bolts to 53-64 lb.ft. (72-87 N•m).

32. Counting the number of turns, remove the travel limit plunger from the cylinder head and install a new o-ring onto the

plunger and lubricate the o-ring with grease.

33. Install the travel limit plunger, do not install any farther then the previously noted number of turns to ease in final

adjustments.

STEERING GEAR

CYLINDER HEAD

O-RING SEAL

BOLT

INPUT END PLAY

ADJUSTMENT CAP

LOCK NUT

THRUST BUTTON

O-RING SEAL

LIMIT PLUNGER

O-RING SEAL

LOCK WASHER

INPUT SHAFT END PLAY

ADJUSTMENT SCREW

LIMIT PLUNGER

ACCESS PLUG

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