Hummer H1 (2006+). Manual - part 265

9-38 Axles, Suspension and Frame

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Front Propshaft Installation

1.

Position the front shaft on the engine mount, axle yoke and the transfer case yoke.

2.

Connect the front shaft to the transfer case yoke with the U-bolts and the nuts. Tighten the nuts to 13-18 lb-ft. (18-24 N•m).

3.

Connect the front shaft to the front axle yoke with the bolts. Tighten the bolts to 13-18 lb-ft. (18-24 N•m).

4.

Secure the center bearing to the engine mount with the bolts, washers and the locknuts. Tighten the bolts to 60 lb-ft. (81 N•m).

5.

Lubricate the propeller shaft U-joints and the slip yokes with chassis grease.

Rear Propeller Shaft Service

Removal

1.

Remove the 4 bolts and the two straps attaching the rear drive shaft to the rear axle yoke (Figure  9-64).

2.

Slide the shaft slip yoke out of the transfer case extension housing and remove the shaft from the vehicle.

Figure 9-64:   Rear Propeller Shaft Attachment

3.

Inspect the condition of the U-joint cross and the bearings at each end of the shaft (Figure  9-65). Replace either U-joint if
worn, loose or seized. Refer to U-joint replacement in this section.

Figure 9-65:   U-joint Components (Typical)

TRANSFER CASE

EXTENSION

HOUSING

FRONT YOKE

AND U-JOINT

REAR

U-JOINT

REAR PROPELLER

SHAFT

REAR AXL

YOKE

STRAP

BOLT

SNAP RING

 REAR

YOKE

BEARING

SNAP RING

CROSS

BEARING

GREASE FITTING

CROSS

 SHAFT

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 Axles, Suspension and Frame  9-39

Installation

1.

Slide the propeller shaft slip yoke into the extension housing.

2.

Connect the shaft to the axle yoke with the two straps and the 4 bolts. Tighten the bolts to 13-18 lb-ft. (18-24 N•m).

3.

Lubricate the propeller shaft U-joints.

U-Joint Replacement

1.

Remove the propeller shaft.

2.

Remove the grease fitting from the cross (Figure  9-66).

3.

Remove the two bearing cups from the cross (rear shaft only).

4.

Remove the snap rings from the bearings in the yoke.

5.

Position the propeller shaft in a vise with a 1-1/8 socket between the vise jaw and the bearing being removed. Be sure the open
end of the socket is facing the bearing cup (Figure  9-66).

Figure 9-66:   U-Joint Cross and Bearing Installation

6.

Place a 11/16 socket between the opposite bearing and the vise jaw. Be sure the open end of the socket is facing the vise jaw.

7.

Tighten the vise to press the bearing cup out of the yoke. Then remove the bearings from the cross.

8.

Reverse the position of the sockets and press the remaining bearing out of the yoke.

9.

Remove the cross from the yoke.

10. Pack bearing grease into the bearings to hold the needle rollers in place.

CAUTION: Be sure the grease fitting on the cross faces the yoke. Damage to fitting will result if improperly installed.

11. Position the cross in the yoke.

12. Install the first bearing in the yoke. Verify the bearing cup is aligned with the yoke before pressing in with the vise. Damage to

the cross and the bearing will result if misaligned.

13. Place the yoke in a vise with a 11/16 socket between the vise jaw and the bearing cup. Then press the bearing cup into the yoke

far enough to install the snap ring.

14. Install the remaining bearing in the yoke.

15. Place the yoke in a vise with a 11/16 socket between the bearing cup and the vise jaw.

16. Press the bearing cup into the yoke far enough to install the snap ring.

17. Press the remaining two bearings in the slip yoke and install the snap rings.

18. Install the two additional bearing cups on the cross (rear shaft only).

19. Install the grease fitting in the cross. 

20. Lube the joints and the yokes as required.

LARGE

SOCKET

BEARING

CROSS

SHAFT

YOKE

SMALL

SOCKET

BEARING

9-40 Axles, Suspension and Frame

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SUSPENSION SYSTEM

General Description

The HUMMER H1 suspension system consists of a heavy-duty coil spring, a heavy-duty hydraulic shock absorber, and an upper
and lower control arm at each wheel. This suspension system provides for a smoother ride and allows for more positive control of
the vehicle.

Ball joints allow the control arms and geared hubs to change angles for smooth steering during turns. A stabilizer bar is located on
the front suspension to aid in stabilizing the vehicle when it is turning. Each end of the stabilizer bar is attached to the lower control
arms  (Figure  9-67). 

Figure 9-67:   Suspension System

Specifications

Geared Hubs

Suspension Height Measurement

NOTE: Before checking suspension height, check the following items:

a.

Broken spring coil or shock absorber.

b.

Winch plus other aftermarket accessories installed on the front end of the vehicle.

c.

Worn out control arm bushings.

Upper Ball Joint Slotted Nut

65 lb-ft. (88 N•m)

Lower Ball Joint Slotted Nut

73 lb-ft. (99 N•m)

Control Arm Bracket

90 lb-ft. (122 N•m)

Control Arm Bushing

260 lb-ft. (354 N•m)

Shock Absorber Bottom Bracket

178 lb-ft. (242 N•m)

Shock Pin-Top/Bottom

300 lb-ft. (408 N•m)

Access Cover

15 lb-ft. (20 N•m)

Access Plug, Halfshaft. Bolt

8-13 lb-ft. (11-18 N•m)

Drain or Fill Plug

8-13 lb-ft. (11-18 N•m)

Halfshaft to Drive Gear Bolt

37 lb-ft. (50 N•m)

Input Seal Plate 

30 lb-ft. (40 N•m)

Steering Cover

65 lb-ft. (88 N•m)

UPPER

BALL

GEARED HUB

LOWER 

SHOCK

COIL

CONTROL

 JOINT

SPRING

ABSORBER

CONTROL 

ARM

ARM

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 Axles, Suspension and Frame  9-41

d.

Worn out ball joints.

e.

Damaged frame or suspension components.

1.

Check the tire pressure, the front tires should be at 26 psi and the rear tires at 28 psi, curb weight.

2.

Ensure that the tires and the rims are original equipment as supplied by AM General.

3.

Position the vehicle on a level surface.

4.

Remove any load from the vehicle interior or the roof rack. Tools, luggage, recreational equipment or similar items may
produce faulty measurements if left in the vehicle.

5.

Jounce the vehicle front and rear 2-3 times and allow the suspension to settle.

6.

Check the suspension height by measuring the distance between the bottom edge of each lower control arm front crossmember
bracket and the shop floor as indicated by dimension “X” (Figure  9-68).

Figure 9-68:   Suspension Height Measurement

a.

Suspension height is acceptable if the height measured at each side is 16 inches (40.6 cm) or greater and the left right
measurements do not differ more than 3/4" (19mm).

b.

Replace the springs only if the height measured is less than 16 inches (40.6 cm) at either side, or if the right-left variation
exceeds 3/4" (19mm).

GEARED HUB

NOTE: Replacement procedures are basically the same for the front and rear geared hubs. This procedure covers the front geared hub.

Removal

1.

Remove the wheel. 

2.

Remove the drain plug from the geared hub and drain the geared hub (Figure  9-69).

Figure 9-69:   Geared Hub Drain plug Location

X

X

SLOTTED NUT

GEARED HUB

TIE ROD END

DRAINPLUG