Chevrolet 1977 light duty truck, Service Manual

Page: 819 / 861

3. Remove steel thrust plate and ru b b e r disc from
case b earin g as required.
M O T O R ASSEMBLY
1. If new field and case assembly is being installed,
splice the black and black with pink stripe leads o f the
new field with the corresponding leads o f the wiper
term inal board.
2. Install ru b b er thrust disc, steel thrust disc and
felt lubricting w asher in case assembly bearing in o rder
indicated.
3. Lubricate end of arm a tu re shaft that fits in case
bearing. Next, install thrust ball in end o f shaft.
4. Assemble a rm a tu re in case and field assembly
(fig. 8-33).
5. Position partially assembled brush plate (fig.
8-34) over a rm a tu re shaft fa r enough to allow assembly
o f r e m a in in g brush in its brush holder, then position
brush plate on m ounting tabs in position shown in
Figure 8-31.
N O T E : Circuit breaker should be opposite field
cross over splice connections (Figure 8-32).
6. C e n te r b ru sh p late m o u n tin g holes over
m ou n tin g tabs and bend tabs toward brush holders as
required to secure brush plate in position.
CAUTION: Be sure tabs are centered in brush
pla te m ounting holes.
7. Remove brush retain er clips and resolder black
cotton covered lead to circuit b reak er (fig. 8-31).
8. If new case and field assembly is used, scribe a
line on it in the same location as the one scribed on the
old case. This will insure p ro p er alignm ent o f the new
Fig. 8 -3 4 - - Bru sh P l a t e A s s e m b ly
case with the scribed line m ade on the housing (Step 1
under Brush Plate Removal).
9. Position a rm a tu re worm shaft inside housing
and. using scribed reference marks, line up as near as
possible the case and filed assembly with the housing.
10. M ain tain in g the arm a tu re in its assembled
position in the case, start the a rm a tu re worm shaft
through the field and housing bearing until it starts to
mesh with the worm gear. At the same time, carefully
pull the excess black and black and pink stripe leads
through the housing grommet.
CAUTION: It m ay be necessary at this p o in t to
rotate arm ature slightly before the armature
worm will engage with worm gear teeth.
11. Rotate the case as required to align the bolt
holes in the case with those in the housing.
12. Secure the case to the housing with the two tie
bolts.
13. Adjust a rm a tu re end-play as described und er
"W ip e r A djustm ents".
W IP E R A D J U S T M E N T S
A rm ature End-Play
Loosen adjusting screw locknut (Figure 8-27) and
tighten the adjusting screw until finger tight, tighten
locknut.
Gear Assem bly End-Play
A dd end-play washers as required to obtain .005"
m inim um end-play (Figure 8-27).
W ASHER P U M P
T he washer p u m p a n d / o r valve assembly m ay be
removed from the w iper assembly as a unit; therefore, it
is not necessary to remove the wiper assembly from the
vehicle if only the washer pu m p a n d / o r valve assembly
requires service.
W hen the p u m p is removed from the wiper
BRUSH HOLDER