Chevrolet 30 Series 1967 Service Manual page 525

The Type "E " two-speed electric windshield wiper as­
sembly (fig. 36) incorporates a non-depressed type
(blades park approximately
motor and gear train. The rectangular, 12 volt, com­
pound wound motor is coupled to a train consisting of a
helical drive gear at the end of the motor armature shaft,
an intermediate gear and pinion assembly, and an output
gear and shaft assembly.
the output gear shaft. Depending on the wiring harness
of the different trucks, the wiper motors are equipped
with three or four terminals.
a four terminal assembly is used, servicing both, the
three terminal and the four terminal models.
Two switches, connected in parallel, control the start­
WIPER MOTOR
REMOVAL AND INSTALLATION
10-60 Conventional Cab Models (Fig. 29)
1. Disconnect battery ground cable.
2. Remove wiper arms and blades from transmission
shaft.
3. Remove plenum chamber grille.
4. Disconnect wiper drive rods from crank arm; re­
move crank arm nut and arm from motor shaft.
5. Working under instrument console, disconnect wiper
motor and washer wiring connectors.
. Disconnect washer hoses from washer pump.
6
7. Remove motor attaching screws and motor from cowl
mounting position.
. To install, reverse removal procedure.
8
NOTE:
Make certain wiper motor and blades
are in the "Park" position.
F ig . 29 - W iper Motor Installation - C o n v. Cab
GENERAL DESCRIPTION
" above windshield molding)
2
The crank arm is attached to
For service replacement
SERVICE OPERATIONS
ELECTRICAL—BODY AND CHASSIS 12-25
ing, stopping and parking of the Type "E " wiper motor.
The manually operated start, stop switch is located on the
instrument panel, while the cam operated park switch is
located in the wiper gear box.
The windshield washer pump used on the 2 -speed Type
"E " wiper motor assembly is a positive displacement
type pump employing a small bellows, bellows spring and
valve arrangement. The pumping mechanism is actuated
by a four lobe cam and driven directly by the wiper
motor (fig. 37). Thus, when the wiper is operated, this
rotor is always turning with the gear.
accomplished electrically and mechanically by a relay
assembly and ratchet wheel arrangement.
Chevy Van (Fig. 30)
1. Disconnect battery ground cable.
2. Disconnect electrical connections and washer hoses.
3. Loosen nuts securing drive link to wiper motor crank
arm and disengage ball joint.
4. Remove motor attaching screws and motor from cowl
mounting position.
5. To install, reverse removal procedure.
Tilt Cab Models (Fig. 31)
NOTE: Two separate
power the wipers, one switch controlling both.
Figure 31 is an exploded view of the left hand
wiper assembly installation.
bly is identical, however, it will be necessary to
Programming is
motors are used to
Right hand assem­
CHEVROLET TRUCK SERVICE M ANUAL