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Hummer H1 (2002+). Manual - part 145

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Axles, Suspension, and Frame 9-41

05745159

Clean part with solvent.

Inspect shaft, slip yokes and U-joints for wear or damage.

Replace worn U-joints. Refer to procedure in this section.

10. Install shield on shaft.

11. Start new center bearing on shaft.

Figure 9-108: Center Bearing Removal/Installation

12. Install retainer on center bearing.

13. Press center bearing on front propeller shaft until seated

against shoulder. Ensure flange on center bearing faces up.

14. Install dust caps on yokes.

15. Coat shaft splines with chassis grease.

NOTE:

Be sure grease fittings on dust caps are aligned with

wide splines in slip yokes.

16. Align and assemble shaft, slip yokes, and dust caps.

17. Lubricate U-joints and slip yokes with chassis grease.

Front Propshaft Installation

Position front shaft on engine mount, axle yoke and trans-
fer case yoke.

Connect transfer case shift rod to transfer case range lever.

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

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

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

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

REAR PROPELLER SHAFT SERVICE

Removal

Remove U-bolts, attaching rear shaft to rear axle yoke
(Figure 9-109).

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

Figure 9-109: Rear Propeller Shaft Attachment

Inspect condition of U-joint cross and bearings at each end
of shaft (Figure 9-110). Replace either U-joint if worn,
loose, seized. Refer to U-joint replacement in this section.

Figure 9-110: U-joint Components (Typical)

Installation

Slide propeller shaft slip yoke into extension housing.

Connect shaft to axle yoke with U-bolts, lockwashers and
nuts. Tighten U-bolt nuts to 13-18 lb-ft (18-24 N•m)

Lubricate propeller shaft U-joints.

FRONT

PROPELLER

SHAFT

SHIELD

SHOULDER

CENTER

BEARING

RETAINER

STANDARD

BEARING

PULLER

TRANSFER CASE

EXTENSION

HOUSING

FRONT YOKE

AND U-JOINT

REAR

U-JOINT REAR AXLE

YOKE

REAR PROPELLER

U-BOLT

WASHER

NUT

SHAFT

SNAP RING

REAR SHAFT

YOKE

BEARING

SNAP RING

CROSS

BEARING

GREASE FITTING

CROSS

9-42

Axles, Suspension, and Frame

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U-JOINT REPLACEMENT

Remove propeller shaft.

Remove grease fitting from cross (Figure 9-111).

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

Remove snap rings from bearings in yoke.

Position propeller shaft in vise with 1-1/8 socket between
vise jaw and bearing being removed. Be sure open end of
socket is facing bearing cup (Figure 9-111).

Figure 9-111: U-Joint Cross and Bearing Installation

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

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

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

Remove cross from yoke.

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

place.

CAUTION: Be sure grease fitting on cross faces yoke. Dam-
age to fitting will result if improperly installed.

11. Position cross in yoke.
12. Install first bearing in yoke. Verify bearing cup is aligned

with yoke before pressing in with vise. Damage to cross
and bearing will result if misaligned.

13. Place yoke in vise with 11/16 socket between vise jaw and

bearing cup. Then press bearing cup into yoke far enough
to install snap ring.

14. Install remaining bearing in yoke.
15. Place yoke in vise with 11/16 socket between bearing cup

and vise jaw.

16. Press bearing cup into yoke far enough to install snap ring.
17. Press remaining two bearings in slip yoke and install snap rings.
18. Install two additional bearing cups on cross (rear shaft

only).

19. Install grease fitting in cross.
20. Lube joints and yokes as required.

SUSPENSION HEIGHT MEASUREMENT

NOTE:

Before checking suspension height, check the follow-

ing items:

Broken spring coil or shock absorber.

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

Worn out control arm bushings.

Worn out ball joints.

Damaged frame or suspension components.

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

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

Position vehicle on level surface.

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

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

Check suspension height by measuring distance between
bottom edge of each lower control arm front crossmember
bracket and shop floor as indicated by dimension “X”
(Figure 9-112).

Figure 9-112: Suspension Height Measurement

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

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

LARGE

SOCKET

BEARING

CROSS

SHAFT

YOKE

SMALL

SOCKET

BEARING

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Axles, Suspension, and Frame 9-43

05745159

COIL SPRING REPLACEMENT

NOTE:

The procedure for removing and installing all four coil

springs is basically the same. This procedure covers the left
front coil spring.

NOTE:

Various load capacity springs are used in the Hummer

based on powertrain and option packages. Refer to the parts
catalog to select the proper replacement spring for the specific
application.

Removal

Remove wheel (Section 6).

Remove bolt, two washers, and bar link from lower
control arm.

Remove four locknuts, washers, bolts, washers, lower ball
joint, and geared hub from lower control arm (Figure 9-113).

Place jack under lower control arm and raise lower control
arm slightly to relieve tension on shock pin.

Remove locknut, shock pin, washer, and shock absorber
from spring seat and collapse shock absorber.

NOTE:

It may be necessary to loosen lower control arm bolts

to allow lower control arm to be lowered.

Pull geared hub and lower ball joint away from lower
control arm and remove coil spring from lower control
arm and shock absorber.

Installation

NOTE:

Index coil spring in spring pocket for a slight gap 1/16

- 1/8 in. (1.59 - 3.18 mm) when spring is in position.

Install coil spring over shock absorber and onto lower con-
trol arm ensuring end of coil spring fits in spring pocket of
lower control arm (Figure 9-113).

Ensure coil spring is aligned with spring seat flange, and
raise lower control arm.

Extend shock absorber into spring seat and install with
washer, shock pin, and locknut. Tighten locknut to 300 lb-
ft (407 N•m).

Install lower ball joint and geared hub on lower control
arm ensuring lower ball joint is placed below lower
control arm. Secure lower ball joint to lower control arm
with four washers, bolts, washers, and locknuts. Tighten
front locknuts to 37 lb-ft (50 N•m) and rear locknuts to 60
lb-ft. (80 N•m).

Apply thread-locking compound to threads of bolt. Install
bar link on lower control arm with two washers and bolt.
Tighten bolt to 70 lb-ft (95 N•m).

Install wheel (Section 6).

Figure 9-113: Coil Spring Replacement

COIL SPRING

SHOCK PIN

SPRING SEAT

GEARED HUB

LOWER

CONTROL

ARM

BAR LINK

LOWER BALL JOINT

SHOCK ABSORBER

SPRING POCKET

LOWER CONTROL ARM

9-44

Axles, Suspension, and Frame

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SHOCK ABSORBER REPLACEMENT

NOTE:

The procedure for removing and installing all shock

absorbers is the same, except rear lower shock pins must be in-
stalled with head of pin facing rearward. This procedure covers
the left front shock absorber.

Removal

Remove two bolts, lockwashers, washers, shock absorber,
and bracket from lower control arm (Figure 9-114).

Remove locknut, shock pin, washer, and shock absorber
from spring seat. Note position of pin for installation.

Compress shock absorber and remove shock absorber and
bracket.

NOTE:

Note alignment of shock absorber and bracket for in-

stallation reference.

Position shock absorber in vise and remove locknut, pin,
washer, and bracket from shock absorber.

Installation

NOTE:

It may be necessary to spread spring seat to allow in-

stallation of shock absorber.

Position shock absorber in vise, and install bracket on
shock absorber with washer, pin, and locknut. Tighten
locknut to 300 lb-ft (407 N•m) (Figure 9-114).

CAUTION: Do not pry or use sharp tools on shock absorber
piston rod. A damaged rod will cause shock failure.

Install shock absorber and bracket through lower control
arm.

Extend shock absorber and secure piston rod end of shock
absorber to spring seat with washer, shock pin, and
locknut. Tighten locknut to 300 lb-ft (407 N•m).

Install bracket on lower control arm with two washers,
lockwashers, and bolts. Tighten bolts to 178 lb-ft (241
N•m).

Figure 9-114: Shock Absorber Replacement

SPRING SEAT

LOWER CONTROL ARM

BRACKET

SHOCK

SHOCK PIN

PIN

ABSORBER

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