Upper Control Arm Pivot Shaft And Bushings - GMC G Service Manual

UPPER CONTROL ARM PIVOT
SHAFT AND BUSHINGS
R10/1500, G10/1500 AND G20/2500 MODELS
H Remove or Disconnect (Figures 5 through 13
Tools Required:
J 24435-1 Lower Control Arm Bushing
Remover
J 24435-3 Lower Control Arm Bushing
Remover
J 24435-7 Lower Control Arm Bushing Fixture
1. Upper control arm (28).
• Refer to "Upper Control Arm" in this section.
2. Nuts (24), bushings (26) and the pivot shaft (29) from
the upper control arm (28).
• Use J 24435-1, J 24435-3 and J 24435-7
(figure 30).
• Tighten J 24435-7 to remove the bushing (26).
• Pivot shaft (29) can be pulled free at this time.
• Repeat this procedure on the remaining
bushing (26).
Install or Connect (Figures 5 through 13
B
and 31)
Tools Required:
J 24435-4 Lower Control Arm Bushing Installer
J 24435-5 Lower Control Arm Bushing Installer
J 24435-7 Lower Control Arm Bushing Fixture
1. Bushings (26) and the pivot shaft (29) into the upper
control arm (28).
• Use J 24435-4, J 24435-5 and J 24435-7
(figure 31).
• Tighten J 24435-7 until the bushing (26) fully
seats.
• Slide the pivot shaft (29) into the upper control
arm (28), then install the other bushing (26).
NOTICE: See " Notice" on page 3C-1 of this
section.
2. Nuts (24) in place.
I & l Tighten
• Nuts (24) to 156 N*m (115 ft. lbs.).
3. Upper control arm (28) to the crossmember.
• Refer to "Upper Control Arm" in this section.
4. Caliper (if removed).
• Refer to HYDRAULIC FOUNDATION BRAKES
(SEC. 5A2).
• Check the front end alignment and reset as required.
• Refer to FRONT END ALIGNMENT (SEC. 3A).
• Remove the supports and lower the vehicle.
FRONT SUSPENSION 3C-27
R-P20/2500-30/3500 AND G30/3500 MODELS
r H Remove or Disconnect (Figures 5
through 13)
• Raise the vehicle and support the lower control arms
with a floor jack positioned under or near the ball joint
assembly.
1. Wheel and tire assembly.
• Loosen, but do not remove the pivot shaft to frame
nuts (27).
2. Shim packs (18).
• Tape each pack together and mark their posi­
tion to ensure exact replacement during
installation.
3. Pivot shaft to frame nuts (27), bolts (4) and spacers
(19).
• Do not allow the upper control arm (28) to swing
too far from the frame crossmember.
] Important
• Install a chain over the upper control arm (28)
inboard of the stabilizer bar (59) and outboard
of the shock absorber (20), to retain the upper
control arm in a close relationship to the frame
crossmember.
4. Pivot shaft (29) and bushings (26).
• Unscrew the bushings (26).
• Slide the pivot shaft (29) out of the upper control
arm.
5. Grease fitting (12).
6. Inner seals (between the bushings and the pivot
shaft).
or Connect (Figures 5 through 13 and
H install
NOTICE: For steps 3 and 6, see " Notice" on page
3C-1 of this section.
1. New inner seals onto the pivot shaft (29).
2. Pivot shaft (29) into position inside the upper control
arm.
3. New bushings.
• Do not tighten.
• The pivot shaft (29) must be centered in the
upper control arm (28) as shown in figure 33.
Tighten
• Bushings (26) to 257 N«m (190 ft. lbs.).
IC T Inspect
• Pivot shaft for free rotation.
4. Grease fitting (12).
• Grease the bushings (29). Refer to MAINTE­
NANCE AND LUBRICATION (SEC. 0B).
5. Pivot shaft (29) to the frame.