Chevrolet 1977 light duty truck, Service Manual

Page: 814 / 861

D I A G N O S I S - W AS H E R SYSTEM
C O N D I T I O N
A P P A R E N T C A U S E C O R R E C T I O N
1. W a s h e r in o p erativ e
A. I n a d e q u a te q u a n tity
o f w a s h e r solution
A. A d d w a sh e r
so lu tio n
B. H o ses d a m a g e d o r loose B. C u t s h o rt length
to in su re air
tight c o n n e c tio n
o r rep lace hose
C. P lu g g ed screen at end
o f j a r c o v e r hose
C. C le a n screen
D. L oose electrical
c o n n e c tio n to w a s h e r
p u m p o r w iper switch
D. C h e c k electrical
c o n n e c tio n and
r e p a ir if necessary
E. O p e n circuit in feed
w ire to p u m p solenoid
coil
E. L o c a te o p e n circuit
an d re p a ir
F. W ip e r sw itch defective F. R e p la c e w iper switch
G . P u m p solenoid coil
defective
G . R e p la c e solenoid
H . W a s h e r nozzles plu gged
H. C lean w a s h e r nozzles
I. R a tc h e t wheel to o th
missing I. R e p la c e ra tc h e t wheel
J. R a t c h e t pawl spring
m issing J. R e p la c e ra tc h e t pawl
sp rin g
K. Defective p u m p valve
assem bly
K. R e p la c e p u m p valve
assem bly
2. W a s h e r p u m p s
c o n tin u o u s ly w h en
wipers a re o p e ra tin g
A. G r o u n d e d w ire from
p u m p solenoid to
sw itch
A. L o c a te g ro u n d e d wire
an d re p a ir
B. W ip e r Switch Defective
B. R e p la c e w iper sw itch
C. R a tc h e t wheel to o th
m issing C. R e p la c e r a tc h e t wheel
D. R a tc h e t wheel dog
b ro k e n o r not c o n ta c tin g
r a tc h e t wheel teeth D. R e p la c e o r rep air
ra tc h e t wheel dog
E. L o c k -o u t tan g b ro k e n o r
bent on piston a c tu a tin g
plate E. R e p la c e piston
a c tu a tin g p late