Chevrolet 70 1969 Series, Shop Manual

Page: 39 / 913

CAB A N D BODY M OUNTINGS 1-12
Figure 1 5- Checking Washer Solenoid
B ench Check
1. Manually actuate the solenoid plunger and
check for binding condition,
2. Check relay coil as follows: Connect 12
volt supply to washer terminals (fig. 15), Observe
if solenoid plunger pulls in. Failure of solenoid
plunger to pull in indicates an open solenoid coil
or poor solder connections.
IN T A K E V A L V E
X' i / PISTON
j K i f ~ S P R IN G PLATE T A N G
ACTUATOR PLATE
EXHAUST
VA| v t
ACTUATOR
Figure 16— W asher Pum p Piston and Valve Assem bly
3, if solenoid plunger pulls in correctly, man­
ually actuate the cam follower lower pin and ob­
serve if pump piston and actuator plate operate
freely, Locate and correct cause if binding occurs.
4, Attach a hose to the large or intake pipe.
You should be able to blow, but not draw, through
intake pipe (fig. 4),
5. Attach a hose individually to each of the
small exhaust pipes. You should be able to draw,
but not blow, through them. If any of the valves
allow air to pass in both directions, the valve as­
sembly is defective and must be replaced.
P U M P D IS A S S E M B L Y A N D A S S E M B L Y (Fig. 17)
1, Remove washer pump cover.
2. Remove ratchet dog retaining screw. Hold
spring loaded solenoid plunger in position and
carefully lift the solenoid assembly and ratchet
dog off pump frame.
7 6
8 NOTE; Ratchet p aw i sp rin g rem oved in a b o v e ’
1 Coil Terminals
2 Solenoid Plunger
3 Actuator Plate Tang
4 C a m Follower Upper Pin
5 Ratchet Pawl
6 C am Follower Lower Pin
10
ii
\
12
13
7 Ratchet Wheel
8 Valve Assy. Mtg. Screws
9 Valve Assembly
10 Ratchet Dog
11 Dog Retaining Screw
14
12 Solenoid Coil Assembly
13 Pivot Pin
14 Piston Actuator Plate
15 Ratchet Wheel Spring
16 Ratchet Pawl Spring
Figure 1 7— W asher Pum p M echanism
CHEVROLET SERIES 70-80 H E A V Y DUTY TRUCK SH O P M A N U A L