Chevrolet 1977 light duty truck Service Manual page 293

3. Torque nut to specifications.
4. Install shock absorber to lower control arm and
install stabilizer bar.
5. Remove tool J-23028 and safety chain.
6. Lower vehicle to floor.
U PPER C O N TR O L ARM IN N E R P IVO T
S H A FT A N D /O R B U S H IN G R EPLA C EM EN T
C 2 0 -30 , G 3 0 and P 10-30 (S teel Bushings)
Pivot Shaft Removal
1. Raise vehicle and
assembly.
2. Support the lower control arm with a floor jack.
N O TE : Position jack un der the ball joint assembly
or as n e a r as possible and still have good support.
3. Loosen the upper control arm shaft end nuts
before loosening the shaft to fram e attaching nuts.
4. Loosen the shaft to fram e nuts and remove the
caster an d c am b er shims.
N O T E : Tape the shims
removed and mark for position.
5. Remove the pivot shaft to fram e nuts but do not
allow the arm to swing too fa r away from the frame.
N OTE: Use a safety chain to retain the arm in a
close relationship to the frame. See Fig. 3C-18.
remove tire and wheel
together as they are
6. Remove the shaft end nuts and remove shaft
from arm.
Bushing Replacement (Steel Bushings)
1. Remove grease fittings from bushing outer ends
and unscrew bushings from control arm and shaft.
2. Slide new seal on each end of shaft and insert
shaft into control arm.
3. Start new bushings on shaft and into control
arm. Adjust shaft until it is centered in control arm. then
turn bushings in and torque to specifications. Figure 3C-
19 shows correct final positioning o f shaft. Check shaft
for free rotation and install grease fittings.
Installation
CAUTION: See C A U T IO N on page I o f this
section regarding the fasteners referred to in
steps 3, 5 and 6.
NOTE: W hen installing the upper control arm be
sure to properly position
washers to the pivot shaft with convex and concave
sides together.
1. Install the shaft to the control arm and install
end nuts. Do not torque nuts at this time.
2. Position cross shaft to fram e bolts and start
cross shaft nuts.
3. Torque the shaft end nuts. See Fig. 3C-19 for
proper spacing.
NOTE: The shaft should rotate by hand after the
nuts are torqued.
4. Install caster and
appropriate places.
5. Torque the cross-shaft to fram e nuts.
6. Remove the safety chain and install the tire.
7. Lower vehicle to the floor.
LOWER C O N TR O L ARM IN N E R P IVO T
SHAFT A N D /O R B USHING REPLACEM EN T
C 20-30, G 30, P 10 -3 0 (Steel Bushings)
Lower—Removal (Fig. 3C-18)
1. Raise vehicle and support the fram e so that
control arms hang free.
2. Position an adjustable
control arm inboard o f spring and into depression in
lower arm.
3. Install a chain over upper arm (Fig. 3C-18).
Inboard o f stabilizer and outboard o f shock absorber as
a safety measure.
4. Disconnect shock absorber at lower control arm.
5. Loosen shaft end nuts.
6. Remove " U " bolts.
7. Lower jack just enough to get at shaft.
8. Remove shaft end nuts and remove shaft.
Bushing Replacement (Steel Bushings)
1. Remove grease fittings from ends of bushings
and unscrew bushings from shaft and control arm.
Remove shaft and seals.
the special aligning
c a m b e r shim in their
floor jack under the