Buick LeSabre 1965 Service Manual page 687

ELECTRICAL SYSTEMS
WINDSHIELD WASHER 1 0 - 1 1 7
ratchet pawl from the armature,
allowing the ratchet pawl to en-
gage the ratchet wheel teeth. At
the same time, the relay arma-
ture hair spring trips to a po-
sition under the armature holding
it away from the ratchet wheel
and ratchet pawl.
b. Operation
Pump action remains the same
regardless of w h e t h e r wiper
motor is on when washer button
is depressed or if button is de-
pressed to start w a s h e r and
motor at the same time.
1. Idling.
With wiper motor turning, the el-
liptical cam follower is rotated
by the guide pin on the ratchet
pawl lever. The tang on the pump
slide lever is- on the high portion
of the ratchet wheel ramp, leaving
the pump in a cocked position.
The pump slide lever is spring
loaded by a coil spring next to
the rubber cup diaphragm.
With the wiper motor turning, the
elliptical cam follower is rotated
by the guide pin of the motor
drive plate. The pump slide lever
is held from pumping by the tang
resting on the high portion of the
nylon ratchet wheel ramp. The
ratchet pawl does not engage the
teeth of the ratchet wheel because
it is held away from the wheel by
the armature. The armature tang
is engaged in the slot of the
ratchet wheel. The rotating cam
follower contacts the roller and
moves the ratchet pawl lever back
and forth.
The ratchet pawl also moves,
being connected to the ratchet
pawl lever, but no ratchet wheel
rotation takes place. The pump
is idling.
2. Pumping
When the washer button is de-
pressed, the relay energizes. The
armature tang moves out of the
ratchet wheel slot and the arma-
ture hair spring trips under the
armature. As the armature moves
toward the relay, the ratchet pawl
falls free of the armature and
engages a ratchet wheel tooth,
rotating the wheel one tooth. The
distance moved is sufficient for
the pump slide lever tang to fall
off the ratchet wheel ramp and
allow the spring loaded pump to
pump the first stroke. The pump
completes one pumping stroke for
each ratchet whell tooth move-
ment. After the wheel has rotated
approximately 1/2 turn the ramp
engages the armature hair spring
and moves it out from under t\\e
armature. The armature drops
and the tang contacts the ratchet
wheel but does not affect the
ratchet pawl action. After another
1/8 to 1/4 turn of the ratchet
wheel, the pump slide lever tang
contacts the ramp with a resulting
shorter pump stroke. Each suc-
ceeding stroke becomes shorter
until the nylon ratchet wheel has
made one complete revolution and
returned to the starting position.
At that point, the armature tang
drops into the ratchet wheel slot,
with the ratchet pawl entering the
large slot in the armature and
lifting away from the ratchet
wheel teeth. The pump is then
returned to idling and has com-
pleted one pumping cycle.
1 0 - 6 2 WINDSHIELD
WASHER DIS-
ASSEMBLY AND
ASSEMBLY
a. Removal and
Replacement of Relay
and Terminal Board
1. Remove washer pump cover.
2. Rotate nylon rotor cam to free
ratchet arm from relay armature
and lift out relay coil assembly.
CAUTION:
essary to
Whenever it is nec-
solder connection on
either the wiper or the pump,
rosin core solder should be used.
Do not use acid core solder.
3. To reinstall, hold relay arma-
ture in against the coil pole and
position the relay mounting stud
in the slot provided in the pump
body casting.
4. Install spring clip on relay
mounting stud.
5. Assemble terminal insulator
over terminals and position ter-
minal board.
6. Manually rotate washer pump
through a complete cycle to check
if pump is operating properly.
b. Removal and.
Replacement of
Valve Assembly
1. Remove four screws attaching
valve to pump body.
2. C a r e f u l l y r e m o v e valve
assembly.
3. To install reverse removal
procedure.
NOTE: Be certain that bellows is
positioned properly when valve
assembly is installed.
c. Removal and
Replacement of Bellows
1. Remove valve assembly.
2. To release bellows unit from
pump plunger, hold end of pump
slide lever, push in against bot-
tom of bellows and turn bellows
approximately 1/4 turn.
3. To install, reverse removal
procedure.