Chevrolet 1977 light duty truck, Service Manual

Page: 727 / 861

5. R e m o v e p a r k i n g a c t u a t o r rod a n d d e te n t le v e r
a s s e m b l y .
6. R e m o v e p a r k i n g p a w l b r a c k e t a t t a c h i n g scre w s
a n d b r a c k e t .
7. R e m o v e p a r k i n g p a w l r e t u rn s p rin g .
N O T E : T h e f o l l o w i n g steps s h o u ld be c o m p l e t e d
un less p a r t r e p l a c e m e n t is r e q u i r e d .
8. R e m o v e p a r k i n g p a w l s h a f t re ta in e r .
9. R e m o v e p a r k i n g p a w l s h a ft , c u p p l u g p a r k i n g
p a w l s h a f t , a n d p a r k i n g p a w l.
Installation
I n s t a l l a t i o n o f th e p a r k i n g l i n k a g e is the r e v e rs e o f
th e r e m o v a l . U s e n e w seal a n d c u p p lu g , i f r e m o v e d , a n d
n ew b o t t o m p a n g a s k e t.
CONTROL VALVE BODY
Removal
1. R e m o v e b o t t o m p a n a n d filter.
2. D i s c o n n e c t lea d w i r e f r o m p re ss u re switch
a s s e m b l y .
3. R e m o v e c o n tr o l v a l v e b o d y a t t a c h i n g screw s a n d
d e t e n t r o lle r s p r i n g a s s e m b l y .
N O T E : D o n o t r e m o v e s o l e n o i d a t t a c h i n g screws.
CAU TIO N :
I f the transmission is in the vehicle,
the front servo parts may drop out as the
control valve assembly is removed.
4. R e m o v e c o n tr o l v a l v e b o d y a s s e m b l y a n d
g o v e r n o r p ip e s . I f c a r e is t a k e n in r e m o v i n g c o n tr o l v a l v e
b o d y th e six (6) c h e c k b a lls w ill s t a y in p la c e a b o v e the
s p a c e r p late.
5. R e m o v e the g o v e r n o r s c r e e n a s s e m b l y f r o m e n d
o f g o v e r n o r f e e d p i p e o r f r o m the g o v e r n o r f e e d p i p e
h o le in the c a s e ( F i g . 7 A - 1 5 C ) . C l e a n g o v e r n o r s c re en in
c l e a n s o l v e n t a n d a i r d ry.
CAU TIO N :
£>o
not drop manual valve.
6. R e m o v e the g o v e r n o r p i p e s a n d m a n u a l v a l v e
f r o m co n tr o l v a l v e b o d y .
Installation
I n s ta lla tio n o f c o n tr o l v a l v e b o d y is in r e ve rs e o f
r e m o v a l . S ee O v e r h a u l M a n u a l . A d j u s t fluid level.
PRESSURE REGULATOR VALVE
Removal
1. R e m o v e b o t t o m p a n a n d filter.
2. C o m p r e s s r e g u l a t o r b o o st v a l v e b u s h i n g a g a i n s t
p re ss u re r e g u l a t o r s p r i n g a n d r e m o v e s n a p r i n g , u s in g
J-5403 pliers.
3. R e m o v e r e g u l a t o r b o o st v a l v e b u s h i n g a n d
v a lv e .
4. R e m o v e p r e s s u re r e g u l a t o r sp rin g .
5. R e m o v e s p r i n g r e t a i n e r , w a s h e r s p ac e r(s ) is
p re se n t, a n d r e g u l a t o r v a lv e .
Installation
N O T E : A solid ty p e p re ss u re r e g u l a t o r v a l v e m ust
o n l y be' used in a p u m p c o v e r w i t h a s q u a re d -o ff'
p re ss u re r e g u l a t o r b oss ( S e e F i g u r e 7 A - 1 6 C ) . A
p re ss u re r e g u l a t o r v a l v e w i t h oil holes a n d orifice
c u p p l u g m a y b e used to s e r v ic e e it h e r ty p e p u m p .
In s ta lla tio n o f the p re ss u re r e g u l a t o r v a l v e is the
re ve rs e o f the r e m o v a l . I n s t a l l i n g n e w g a s k e t o n oil p a n
a n d a d j u s t i n g fluid lev el.
OIL COOLER PIPES
I f r e p l a c e m e n t o f t ra n s m i s s i o n steel t u b i n g c o o le r
p ip e s is r e q u i r e d , use o n l y d o u b l e w r a p p e d a n d b r a z e d
steel t u b i n g m e e t i n g G M s p e c if ic a tio n 1 2 3 M o r its
e q u i v a l e n t . U n d e r n o c o n d i t i o n use c o p p e r o r a l u m i n u m
t u b i n g to r e p l a c e stee l t u b in g . T h o s m a t e r i a l s d o n ot
h a v e s a t i s f a c t o r y f a t i q u e d u r a b i l i t y to w i t h s t a n d n o r m a l
v e h i c l e v i b r a t i o n s .
GOVERNOR SCREEN
ASSY.
GOVERNOR FEED
PIPE HOLE
P U M P C O V E R
F O R I D E N T I F I C A T I O N -
S Q U A R E D O F F P R E S S U R E
R E G . B O S S .