Chevrolet 10 1971 Series Chassis Service Manual page 403

7. Remove mast jacket upper bracket.
8. Remove switch wiring cover from column.
9. Remove switch mounting screws and remove switch,
WINDSHIELD WIPER AND WASHER
G e n e ra l D e s c r i p t i o n .........................................................................
Service O p e r a t i o n s ............................................................................
W ip e r M o t o r ......................................................................................
R e m o v a l .........................................................................................
I n s t a l l a t i o n ..................................................................................
D is a s s e m b ly ..................................................................................
The type " E " two-speed electric windshield wiper
assembly incorporates a non-depressed type (blades park
2"
approximately above windshield molding) motor and
gear train. The rectangular, 12 volt, compound 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 crank arm is attached to the output gear
shaft. Depending on the wiring harness of the different
WIPER MOTOR
REMOVAL A N D INSTALLATION
10-30 Conventional Cab Models (Fig. 16)
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.
If vehicle is equipped with a parking
NOTE:
brake assembly located on the vertical sur­
face of the cowl front panel (directly below the
wiper motor) remove the parking brake as­
sembly attaching bolts (4) to allow shifting of
the assembly rearwards in order to provide
access for removal and installation of the wiper
motor assembly.
Disconnect and remove left-hand defroster hose.
6. Disconnect washer hoses from washer pump.
7. Remove motor attaching screws and motor from cowl
mounting position.
8. To install, reverse removal procedures.
Make certain wiper motor and blades
NOTE:
are in the "P ark" position.
10. To install, reverse removal procedure.
INDEX
Page
12-17 In s p e c t io n ..................................................................................... ...12-18
12-17 A s s e m b ly ........................................................................................ ...12-18
12-17 W in d sh ie ld W ash er P u m p A s s e m b l y .................................... ...12-19
12-17 R e m o v a l - I n s t a lla t i o n ................................................................12-19
12-17 D is a s s e m b ly - A s s e m b l y ..........................................................12-20
12-17
GENERAL DESCRIPTION
trucks, the wiper motors are equipped with three or four
terminals. For service replacement a four terminal as­
sembly is used, servicing both, the three terminal and the
four terminal models.
Two switches, connected in parallel, control the start­
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.
SERVICE OPERATIONS
WIPER MOTOR DISASSEMBLY
Gear Box
Refer to Figure 17.
1. Remove the two washer pump mounting screws and
2. Remove washer pump drive cam as required (fig.
3. Clamp crank arm in a vise and remove crank arm
4. Remove crank arm, seal cap, Tru-Arc retaining ring,
5. Drill out gear box cover retaining rivets, remove
6. Remove output gear and shaft assembly, then slide
7. If necessary, remove terminal board and park switch
ELECTRICAL— BODY AND CHASSIS 12-17
bearing housing, switch cover and shift housing from
column.
lift pump off washer.
21, 22). The cam is pressed on the shaft but can be
wedged off by using two screw drivers between cam
and plate.
retaining nut.
Failure to clamp crank arm may re­
CAUTION:
sult in stripping of wiper gears!
and end-play washers.
Seal cap should be cleaned and re­
NOTE:
packed with a water-proof grease before re­
assembly.
cover from gear train.
Screws, nuts and lock washers for re­
NOTE:
assembling cover to wiper are contained in a
service repair package.
intermediate gear and pinion assembly off shaft.
Page
10-30 CHEVROLET TRUCK SERVICE MANUAL