Chevrolet 70 1969 Series, Руководство по ремонту

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C A B A N D BO DY M O U N T IN G S 1-6
STYROFOAM
PIVOT SHAFT
PIVOT SHAFT
HOUSING
Figure 6— Wiper
Arm
Installed
(Tilt
Cab Models)
through the series field coil and divides; part
passing through the shunt field coil to ground at
the
dash switch, the remaining part passing
through the armature to ground at the dash switch.
High Speed Operation (Refer to Figs. 8 and 9)
Moving the dash switch(s) to “ H IG H ” speed
position opens the shunt field circuit to ground at
dash switch and keeps the armature circuit closed
to ground. The shunt field current must then pass
through a 24 ohm resistor located on the wiper
terminal board, and then through the same lead
that connects the armature circuit to ground
through the dash switch.
Figure 7— Wiper Blade Angle Adjustment
(Tilt Cab Models)
WIPER ARM TRANSMISSION A N D
LINKAGE REPLACEMENT
(CONV. CAB)
N O T E : Refer to figure 4 which illustrates the
wiper motor and linkage arrangement.
R E M O V A L
N O T E : Both right and left wiper transmission
units with connecting link rod and motor link rod
are replaced as an assembly.
1. Remove both right and left wiper arms
from transmissions. Pull arms outward to disen­
gage arm retaining clip.
2. Remove special retaining nut, steel washer,
and seal washer from each transmission at front
of windshield.
3. Underneath the dash, remove defroster air
outlet tubing if necessary, and any other items to
allow access to transmission linkage.
4. At motor crank arm under dash, remove
the two nut assemblies which secure link rod to
arm. Disengage end of rod from arm. N O T E : Al­
ternate methods of obtaining access to these two
nuts is to move the wiper motor forward from the
cowl opening or to remove the ash tray panel.
5. Using a short cross-recess type screw­
driver, remove two screws and washer assemblies
which attach each transmission unit to underside
of cowl. Remove the transmissions with linkage
as an assembly.
IN S T A L L A T IO N
Perform the installation procedures in the
reverse of the "Removal" procedures. N O T E : Make
sure the seal washer located below the transmis­
sion units at front of windshield are new or in
good condition before installing; otherwise leakage
may occur later at these two points.
IM P O R T A N T : Before locating the wiper arms
on transmission shafts, make sure wiper motor
was stopped in the "Park" position (fig. 10). Oper­
ate motor, then turn switch off and allow it to stop
in "Park" position. If motor is not in "Park" posi­
tion and arms are installed, the arm travel may
be restricted when motor is started, resulting in a
blown fuse. In any case when motor is first started,
be prepared to turn wiper switch off in the event
wiper arms were installed out of proper sweep
position. Reposition arms if necessary.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L