Chevrolet 1977 light duty truck, Руководство по обслуживанию

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I N T A K E
V A L V E
OPEN
TO
N O Z Z L E S
I N T A K E
V A L V E
C L O SE D
FROM
WASHER
JAR
E X H A U S T
V A L V E S
O PEN
PI STON
SPRING
E X P A N D E D
P ISTON
D I R E C T I O N OF T R A V E L
---------------- I / / 7 T '
' A C T U A T O R P L A T E
I N T A K E S T R O K E
D I R E C T I O N O F T R A V E L •
A C T U A T O R P L A T E
E X H A U S T S T R O K E
SPRING
COMPRESSED
E X H AU S T
V A L V E S
C L OSE D
Fig. 8 - 3 6 -C ross S e c t io n o f W i n d s h i e l d W a s h e r P u m p V a lv e A s s e m b ly
WINDSHIELD WIPER AND WASHER
P MODELS
GENERAL DESCRIPTION
T h e system consists o f a c o m p o u n d w o u n d
rectangular-shaped m otor attached to a gear box
con tain in g a p ark in g switch in addition to the gear train.
The g ear train consists o f a motor a rm a tu re helical
g e a rsh a ft which drives an interm ediate gear and pinion
assembly. The pinion gear o f the interm ediate gear and
pinion drives an output gear and shaft assembly.
T u rn in g the w iper switch to the LO speed position
completes the circuits from the w iper terminals 1 and 3
to ground. C u rre n t then flows from the battery via wiper
terminal No. 2 through the series field and divides; (1)
part passes through the arm atu re to ground via wiper
terminal No. 1 to the wiper switch and (2) the second
part passes through the shunt field to ground through
wiper terminal No. 3 to the wiper switch (fig. 8-37).
NOTE: The wiper switch must be securely
grounded to body metal.
Moving the wiper switch to the HI speed position
opens the shunt field circuit to ground at the switch.
However, the shunt field is connected to a 20 ohm