Chevrolet 1977 light duty truck Service Manual page 131

W IN D S H IE LD W IPERS
W indshield wiper units on all models are o f the two-
speed electric type. A single wiper motor unit, mounted
to the left side o f the dash panel inside the engine
c om partm ent, powers both wiper blades. The wiper blade
op eratin g link rods and pivot mountings on these models
are located in the outside air inlet plenum chamber.
Arm Adjustm ent
To adjust sweep of blades, turn on wipers and note
sweep o f arms. If necessary, remove one or both arms as
follows: Pull outer end o f arm away from glass which
will trip lock spring at base o f arm and release spring
from undercut o f pivot shaft. W hile holding arm in this
position, pull outward on cap section at base o f arm to
remove arm. A rm can be reinstalled in any one o f
several positions due to serrations on pivot shaft and in
arm cap. See figure 2D-7.
W iper Arm Pivot Shafts and Linkage
Removal
1. Remove windshield
shafts. Procedure for removing
previously u nd e r A rm A djustemnt".
" 2. Remove two nut and lock washer assemblies
frfom the connector link to m otor drive arm via the
plenum access hole.
3. Remove two screws from each transmission
FRONT END
pivot shaft assembly to windshield frame. Remove wiper
linkage and transmission from plenum.
Installation
position. Secure
transmission.
assembly. Secure rod.
motor m omentarily which should rotate pivot shafts to
park position. Install arms and shafts.
IN S T R U M E N T PANEL C O M P A R T M E N T AND
LOCK
Replacement
be accomplished by removing four screws which attach
hinge just below box. See figure 2D-8. The outer door
panel may be removed, leaving the com partm ent intact,
by removal o f four screws. Access to the door stop
w iper arms from pivot
arms is explained
1. Place wiper linkage
assembly with
2. Attach end o f cross rod to drive arm o f motor
3. Before installing wiper arms, operate wiper
Removal o f the entire assembly including door may
and transmission into
two screws at each