Hummer H1 (2006+). Manual - part 270

9-58 Axles, Suspension and Frame

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Figure 9-96:   Geared Hub Fill Plug Location

18. Fill the geared hub to the proper oil level (Refer to section 1).

19. Secure the washer and the fill plug to the geared hub. Tighten the fill plug to 8-13 lb-ft. (11-18 N•m).

20. Install the wheel. 

Geared Hub Spindle Bearing Adjustment

Adjustment

1.

Remove the wheel. 

2.

Remove the drain plug and drain the geared hub oil. Install the drain plug into the geared hub. Tighten the drain plug to 8-13
lb-ft. (11-18 N•m) (Figure  9-97).

3.

Remove the four bolts, washers and the steering arm cover from the geared hub. Push the steering arm cover away from the
geared hub  (Figure  9-99).

4.

Remove the clamp nut lock screw from the clamp nut.

5.

Using the clamp nut socket, remove the clamp nut and the keyed washer from the spindle.

6.

 After the clamp nut lock screw is installed into the clamp nut, the clamp nut must be completely installed on the spindle
within a ten minute limit.

GEARED HUB

FILL PLUG

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 Axles, Suspension and Frame  9-59

Figure 9-97:   Geared Hub Drain plug Location

7.

Tighten the clamp nut lock screw three to five turns into the clamp nut.

CAUTION:  Ensure the clamp nut is installed on the spindle with the boss (protruding side) facing inward toward the bearing and
the large chamfer side with the engraved part number is facing away from the bearing.

8.

Apply a thin coat of grease to the boss (protruding side) of the clamp nut and install the clamp nut on the spindle.

NOTE:  If an excessive amount of torque (18-26 lb-in. (2-3 N•m)) is required to tighten the clamp nut lock screw to remove the
clamp nut wobble, remove the screw. Ensure the threads of the clamp nut are clean and free of Loctite. Replace the screw with a
new one or remove all the previously applied Loctite from threads of the old screw and apply fresh Loctite 272 to the old screw
threads prior to reinstallation. Use a hex socket and a torque wrench to tighten and check the screw torque.

9.

Tighten the clamp nut lock screw until all the clamp nut wobble is removed and the clamp nut can still be rotated by hand.

10. Using the clamp nut socket J-42547, tighten the clamp nut to 40 lb-ft. (54 N•m). Rotate the spindle five revolutions both

clockwise and counterclockwise to seat the bearings (Figure  9-98).

Figure 9-98:   Clamp Nut Installation

GEARED HUB

DRAINPLUG

CLAMP NUT 

CLAMP NUT

GEARED

KEYED

CLAMP NUT 

LOCK SCREW

SOCKET

 WASHER

HUB

J-42545

GAP

9-60 Axles, Suspension and Frame

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11. Loosen and retighten the clamp nut to 25 lb-ft. (34 N•m).

NOTE:  Ensure the clamp nut does not move while the clamp nut lock screw is being tightened.

12. Using a hexagon-head socket and a pre-set calibrated torque wrench J-42546, tighten the clamp nut lock screw to 90 lb-in. (10

N•m).

13. Mark a temporary line across the end of the spindle and the clamp nut.

NOTE: Using a feeler gauge, ensure a gap exists between the clamp nut gap surfaces. If no gap exists, remove and discard the
clamp nut lock screw and the clamp nut. Acquire a new screw and nut and repeat steps 6-12.

14. Using a pre-set torque wrench J-42547, apply pressure to the clamp nut in a counterclockwise direction until the torque wrench

clicks, indicating 90 lb-ft. (122 N•m) of loosening torque was applied to the clamp nut.

NOTE: The clamp nut should not move. To verify no movement occurred, check the temporary mark across the spindle and the
clamp nut. If the clamp nut moved, remove and discard the clamp nut lock screw and the clamp nut. Repeat steps 6-13 with a new
screw and nut.

15. Paint or scribe a permanent line across the end of the spindle and the clamp nut.

NOTE:  Immediately install the steering arm cover after application of sealant.

16. Clean the sealing surfaces on the geared hub and the steering arm cover. Apply anaerobic sealant to the steering arm cover and

install it on the geared hub (Figure  9-99).

Figure 9-99:   Steering Arm Cover Installation

NOTE: Thoroughly clean the old Loctite before applying fresh Loctite.

17. Apply thread-locking compound to the bolt threads and secure the steering arm cover to the geared hub with the four washers

and the bolts. Tighten the bolts to 65 lb-ft. (88 N•m).

18. Remove the fill plug and washer from the geared hub (Figure  9-96).

19. Fill the geared hub to the proper oil level (Refer to section 1).

20. Secure the washer and the fill plug to the geared hub. Tighten the fill plug to 8-13 lb-ft. (11-18 N•m).

GEARED HUB

STEERING ARM 

COVER

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 Axles, Suspension and Frame  9-61

Geared Hub Spindle Stud Replacement

WARNING:   Always wear eye protection when replacing spindle studs. Severe eye injury may result if metal chips
contact eyes.

Removal

1.

Remove the wheel. 

2.

Rotate the spindle to allow clearance for removal of the stud from the spindle (Figure  9-100).

3.

Drive the stud from the spindle. Discard the stud.

Figure 9-100:   Geared Hub Spindle Stud Removal

Installation

1.

Install the stud in the spindle (Figure  9-100).

2.

Install three flat washers and a hex nut on the stud.

3.

Tighten the hex nut until the head on the stud seats against the spindle.

4.

Remove and discard the hex nut and the three flat washers.

Geared Hub Vent Line Replacement

NOTE:  All the geared hub vent line replacement procedures are basically the same. This procedure covers the right rear geared
hub vent line.

Removal

NOTE: The speed sensor lead is retained by the vent line clamps and should be removed and reinstalled with care when replacing
the vent line.

1.

Disconnect the vent line from the geared hub fitting (Figure  9-102).

2.

Remove the bolt, clamp and the vent line from the bracket.

3.

Remove the bolt, clamp and the vent line from the control arm.

4.

Remove the bolt, clamp and the vent line from the bracket.

5.

Remove the bolt, clamp and the vent line from the frame (Figure  9-101).

6.

Disconnect the vent line from the tee fitting.

Installation

1.

Secure the vent line to the frame with the clamp and bolt (Figure  9-101).

2.

Secure the vent line to the bracket with the clamp and bolt (Figure  9-102).

3.

Connect the vent line to the tee fitting and the geared hub fitting.

4.

Secure the vent line to control arm the with clamp and bolt.

SPINDLE

STUD