GMC 1982 Light Duty Truck Service Manual page 358

3C-16 FRONT SUSPENSION
UPPER CONTROL A R M IN N ER P IV O T SHAFT
A N D /O R B U S H IN G REPLACEMENT
C 2 0 -3 0 , G 3 0 and P 2 0 -3 0 (Steel Bushings)
Pivot S h a ft R e m o v al
1. R a i s e v e h i c l e a n d r e m o v e t i r e a n d w h e e l a s s e m b l y .
2. S u p p o r t t h e l o w e r c o n t r o l a r m
P o s i t i o n j a c k u n d e r t h e b a l l j o i n t a s s e m b l y o r a s n e a r a s
p o s s i b l e a n d still h a v e g o o d s u p p o r t .
3. L o o s e n t h e u p p e r c o n t r o l a r m s h a f t e n d n u t s b e f o r e
l o o s e n i n g t h e s h a f t t o f r a m e a t t a c h i n g n u t s .
4. L o o s e n t h e s h a f t t o f r a m e n u t s a n d r e m o v e t h e c a s t e r
a n d c a m b e r s h i m s . T a p e t h e s h i m s t o g e t h e r a s t h e y a r e
r e m o v e d a n d m a r k f o r p o s i t i o n .
5. R e m o v e t h e p i v o t s h a f t t o f r a m e n u t s b u t d o n o t a l l o w
t h e a r m t o s w i n g t o o f a r a w a y f r o m t h e f r a m e .
U s e a s a f e t y c h a i n
r e l a t i o n s h i p t o t h e f r a m e . S e e Fi g. 3 C - 1 8 .
6. R e m o v e t h e s h a f t e n d n u t s a n d r e m o v e s h a f t f r o m a r m .
B u sh in g R e p lace m e n t (Steel B u sh in gs)
1. R e m o v e g r e a s e f i t t i n g s f r o m b u s h i n g o u t e r e n d s a n d
u n s c r e w b u s h i n g s f r o m c o n t r o l a r m a n d s h a f t .
2. S l i d e n e w s e a l o n e a c h e n d o f s h a f t a n d i n s e r t s h a f t i n t o
c o n t r o l a r m .
3. S t a r t n e w b u s h i n g s o n s h a f t a n d i n t o c o n t r o l a r m .
A d j u s t s h a f t u n t i l it is c e n t e r e d in c o n t r o l a r m , t h e n
t u r n b u s h i n g s in a n d t o r q u e t o s p e c i f i c a t i o n s . F i g u r e
3 C - 1 9 s h o w s c o r r e c t f i nal p o s i t i o n i n g o f s h a f t . C h e c k
s h a f t f or f r e e r o t a t i o n a n d i n s t a l l g r e a s e f i t t i n g s .
Installation
N O T IC E : S e e
N O T I C E
r e g a r d i n g t h e f a s t e n e r s r e f e r r e d t o in s t e p s 3, 5 a n d 6.
Fig. 3C-18--Removing Inner Pivot Shaft
w i t h a f l o o r j a c k .
t o r e t a i n t h e a r m in a c l o s e
o n p a g e 1 o f t h i s s e c t i o n
When installing the upper control arm be sure to
properly position the special aligning washers to the pivot
shaft with convex and concave sides together.
. Install the shaft to the control arm and install end nuts.
1
Do not torque nuts at this time.
2. Position cross shaft to frame bolts and start cross shaft
nuts.
Torque the shaft end nuts. See Fig.
3.
spacing. The shaft should rotate by hand after the nuts
are torqued.
4. Install caster and camber shim in their appropriate
places.
5. Torque the cross-shaft to frame nuts.
6. Remove the safety chain and install the tire.
7. Lower vehicle to the floor.
LOWER CONTROL A R M IN N ER P IV O T SHAFT
A N D /O R B U SH IN G REPLACEMENT
C 2 0 -3 0 , G 3 0 , P 2 0 -3 0 (Steel Bushings)
Lo w e r-R e m o val (Fig. 3C -1 8 )
1. Raise vehicle and support the frame so that control
arms hang free.
2. Position an adjustable floor jack under the control arm
inboard of spring and into depression in lower arm.
Install a chain over upper arm (Fig.
3.
stabilizer and outboard of 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.
B u sh in g R eplacem en t (Steel B u sh in gs)
Remove grease fittings from ends of bushings and
1.
unscrew bushings from shaft and control arm. Remove
shaft and seals.
Fig. 3C-19--Positioning U.C.A. Shaft (Steel Bushings)
for proper
3 C - 1 9
Inboard of
3 C - 1 8 ) .