Buick LeSabre 1965 Service Manual page 665

ELECTRICAL SYSTEMS
WINDSHIELD WIPER 1 0 - 9 5
SECTION 10-1
WINDSHIELD WIPER AND WASHER ASSEMBLY
CONTENTS OF SECTION 10-1
Paragraph Subject Pag*
10-54 Description and Operation -
Single Speed 10-95
10-55 Trouble-Shooting - Single Speed . . 10-96
10-56 Disassembly and Assembly -
Single Speed 10-100
10-57 Description and Operation -
Two Speed 10-102
10-58 Trouble-Shooting and Testing . . . . 10-105
Paragraph Subject Page
10-59 Disassembly and Assembly . . . . 10-110
10-60 Removal and Replacement of 10-115
Assemblies
10-61 Windshield Washer Description
and Operation 10-116
10-62 Windshield Washer Disassembly
and Assembly 10-117
1 0 - 5 4 DESCRIPTION AND
OPERATION-
SINGLE SPEED
a. General Description
The gear train consists of a heli-
cal gear at the end of an armature
shaft. The helical gear drives an
intermediate gear and pinion as-
sembly, the pinion of which drives
an output gear and shaft assembly.
See Figure 10-99. The crank
arm is attached to the shaft of the
output gear and drives the two
wiper transmission through con-
necting link arms. See Figure
10-129 or 131.
There is no circuit breaker in
this model wiper motor.
b. Principle of Operation
Two switches, a dash switch and
INTERMEDIATE SWITCH
AND PINION ASSY.
OUTPUT GEAR
AND SHAFT ASSY.
Figure 10-96—Typical View
of Gear Train
a park switch control the starting
and stopping of the wiper. The
switch mounted on the dash con-
trols starting the wiper. The park
switch, which is located in the
wiper gear box (Figure 10-99),
controls stopping the wiper. The
operation of the park switch is
explained in the following para-
graph. (Refer to the wiring dia-
gram in Figure 10-101).
When the car owner shuts the
wiper "off" at the dash switch,
the motor circuit to ground is
opened at the dash. However, the
parking switch contacts, which are
normally c l o s e d , maintain the
motor circuit to ground at the
wiper. This allows the wiper to
keep operating until the blades or
wiper crank arm reach the park
position (Blades approx. 2" above
windshield molding). (Figure 10-
100 shows the crank arm in park
position.) At the same time the
blades reach the park position,
a cam on the output gear opens
the park switch contacts. This
opens the motor circuit to ground,
stopping the motor. Thus, the
park switch a c t u a l l y controls
wiper operation only during that
short period of time, after the
owner turns the wiper "off" at
the dash switch but before the
wiper has completely stopped.
Turning the wiper "on" at the
dash switch overrides the open
park switch contacts and closes
the wiper motor circuit to ground,
starting the wiper. (NOTE: Al-
though the park switch contacts
are opened once during each rev-
olution of the output gear, the
park switch has no control over
the wiper until the dash switch
is turned "off".)
Connections to Operate
Wiper
Figure 10-102 shows the proper
method of connecting jumper leads
to the wiper so that it can be
operated independently of the dash
switch or car wiring for test
purposes. (NOTE: Specification
table at end of this section lists
current draw data.)
CRANK ARM' - * *
IN PARK
:
'-3 POSITION i
Figure 10-97—Park Position
of Crank Arm