Upper Ball Joint Replacement - Hummer H1 Service Manual

9-4 Axles, Suspension, and Frame

UPPER BALL JOINT REPLACEMENT

Removal
1. Remove wheel.
2. Raise and support lower control arm.
3. Disconnect the p-clamp securing the vent line and speed
sensor lead to the upper control arm.
4. Remove cotter pin and slotted nut from upper ball joint
(Figure 9-6).
5. Remove four locknuts, bolts, eight washers and upper ball
joint from upper control arm.
6. Separate upper ball joint from geared hub using ball joint
remover J–24319-B or equivalent. Remove ball joint.
Installation
1. Position upper ball joint on upper control arm, ensuring
upper ball joint is placed above upper control arm
(Figure 9-6).
NOTE: Check upper ball joint torque 15 minutes after initial
installation. Adjust if necessary.
2. Install upper ball joint on upper control arm with four
bolts, locknuts and eight washers. Tighten 3/8 fine thread
locknuts to 30 lb-ft (41 N•m).
NOTE: Do not loosen slotted nut to install cotter pin.
3. Install upper ball joint on geared hub with slotted nut.
Using crowfoot and adapter, tighten slotted nut to 65 lb-ft
(88 N•m). Install cotter pin in slotted nut.
4. Install the p-clamp securing the vent line and speed sensor
lead to the upper control arm.
5. Lubricate upper ball joint.
6. Install wheel.
UPPER BALL JOINT
Figure 9-6: Upper Ball Joint Replacement
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UPPER CONTROL ARM
GEARED HUB
LOWER BALL JOINT WEAR CHECK
1. Support lower control arm with a jack or stand to unload
lower ball joint.
2. Place prybar between lower arm at ball joint and geared
hub and measure vertical play obtained by moving pry bar
down (Figure 9-7). Maximum play should not exceed 1/8"
(3.5 mm).
3. Replace ball joint if end play exceeds the limit.
MEASURE
MOVEMENT
HERE
Figure 9-7: Lower Ball Joint Wear Check
PRYBAR
®