Hummer H1 (2006+). Manual - part 272

9-66 Axles, Suspension and Frame

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Lower Ball Joint Replacement

Removal

1.

Remove the wheel.

2.

Raise and support the lower control arm (Figure  9-108).

3.

Remove the cotter pin and the slotted nut from the lower ball joint. Discard the cotter pin.

4.

Remove the four locknuts, bolts, eight washers and the lower ball joint from the lower control arm.

5.

Separate the lower ball joint from the geared hub using ball joint remover J–24319-B or equivalent. Remove the lower ball
joint.

Installation

1.

Install the lower ball joint on the lower control arm, ensuring the lower ball joint is placed below the lower control arm and
secure with the four bolts, locknuts and the eight washers. Tighten the 7/16” locknuts to 65 lb-ft. (80 N•m) (Figure  9-108).

CAUTION: Do not loosen slotted nut to install cotter pin. If necessary, tighten the slotted nuts to align the holes for cotter pin in-
sertion.

2.

Install the ball joint on the geared hub with the slotted nut. Tighten the slotted nut to 73 lb-ft. (99 N•m) and install the cotter
pin in the slotted nut.

3.

Lubricate the lower ball joint until grease is pushed out of the purge slot and wipe off the excess grease.

4.

Install the wheel (Refer to section 6).

Figure 9-108:   Lower Ball Joint Replacement

CONTROL ARM

Upper Control Arm Replacement

NOTE: The procedure for removing and installing the front and rear upper control arms is basically the same. This procedure cov-
ers the left front upper control arm.

Removal

1.

Remove the wheel (Refer to section 6).

2.

Remove the bolt and the washer securing the vent line/speed sensor lead bracket to the geared hub (Figure  9-109).

3.

Disconnect the vent line from the fitting.

4.

Remove the speed sensor from the sensor mount bracket.

5.

Remove the bolt, p-clamp, vent line and the speed sensor lead from the upper control arm (Figure  9-110).

LOWER BALL JOINT

LOWER 

GEARED

CONTROL ARM

HUB

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 Axles, Suspension and Frame  9-67

6.

Remove the cotter pin and the slotted nut from the upper ball joint. 

7.

Separate the upper ball joint from the geared hub using a ball joint remover. 

8.

Remove the four locknuts, bolts and the eight washers securing the upper ball joint to the upper control arm and remove the
upper ball joint.

9.

Mark the position of the eccentric reference holes on the brackets for installation.

10. Remove the two locknuts, washers, eccentrics, bolts and the upper control arm from the brackets and remove the upper control

arm.

Figure 9-109:   Vent Line Connection Replacement

Installation

1.

Install the upper control arm on the brackets with the two washers, eccentrics, bolts and the locknuts. Align the reference holes
(from removal step 8) on the eccentrics with the marks on the brackets. Do not tighten the locknuts (Figure  9-110).

2.

Secure the upper ball joint to the upper control arm with the four washers, bolts and the locknuts. Tighten the locknuts to 37 lb-
ft. (50 N•m).

CAUTION: Do not loosen the slotted nut to install the cotter pin. Doing this may result in damage to the equipment.

NOTE: When the slotted nuts are tightened to the prescribed torque values, the cotter pins must have a minimum of 50% engage-
ment with the nut slots. 

3.

Install the upper ball joint on the geared hub with the slotted nut. Using a crowfoot and adapter, tighten the slotted nut to 65 lb-
ft. (88 N•m). Install the cotter pin in the slotted nut.

4.

Tighten the locknuts on the brackets to 260 lb-ft. (359 N•m).

5.

Install the p-clamp, vent line and the speed sensor lead on the upper control arm with the bolt.

6.

Connect the vent line to the fitting (Figure  9-109).

7.

Install the speed sensor in the sensor bracket.

8.

Secure the vent line/speed sensor bracket to the geared hub with the clamp, washer and the bolt. Tighten the bolt to 37 lb-ft.
(50 N•m).

9.

Install the wheel (Refer to section 6).

GEARED HUB

VENT LINE

BRACKET

FITTING

VENT LINE

SENSOR

LEAD

SPEED

SENSOR

9-68 Axles, Suspension and Frame

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Figure 9-110:   Upper Control Arm Assembly Replacement

Control Arm Bushing Replacement

Removal

NOTE: The control arm bushings must be replaced as a set (Figure  9-111).

1.

Remove the control arm.

2.

Support the control arm and press the bushing out of the control arm.

Installation

1.

Lubricate the outside diameter of the bushing with grease.

2.

Insert the bushing in the control arm (Figure  9-111).

3.

Support the control arm and press the bushing into the control arm until the flange on the bushing seats on the control arm.

4.

Install the control arm.

5.

Adjust the caster and the camber.

VENT LINE

ECCENTRIC

UPPER

CONTROL ARM

BRACKET

ECCENTRIC

REFERENCE

HOLE

PIVOT BOLT

PIVOT

BOLT

NUT

FLAT

WASHER

UPPER

BALL

JOINT

UPPER

CONTROL

ARM

GEARED

HUB

SPEED

SENSOR

LEAD

VENT LINE

SPEED SENSOR

P-CLAMP

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 Axles, Suspension and Frame  9-69

Figure 9-111:   Control Arm Bushing Replacement

Lower Control Arm Replacement

NOTE: The procedure for removing and installing the front and rear lower control arms is basically the same. This procedure cov-
ers the left front lower control arm.

Removal

WARNING:  The lower control arm must be supported during removal and installation. Failure to support the lower
control arm may cause personal injury or damage to the equipment.

1.

Remove the wheel (Refer to section 6).

2.

Remove the shock absorber.

3.

Remove the bolt, two washers and the bar link (front only) from the lower control arm (Figure  9-112).

4.

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

5.

Raise and support the lower control arm. Remove the lower ball joint from the arm.

6.

Lower the lower control arm and remove coil the spring.

7.

Remove the two locknuts, washers, bolts and the lower control arm from the brackets. 

NOTE: Removing the lower ball joint from the geared hub will ease the installation.

8.

Remove the cotter pin and the slotted nut from the lower ball joint. 

9.

Separate the lower ball joint from the geared hub using a ball joint remover. Remove the lower ball joint.

CONTROL ARM

FLANGE

BUSHING