Chevrolet Light Duty Truck 1973, Service Manual

Page: 910 / 979

1 2 - 2 4 ELECTRICAL - BODY AND CHASSIS
Fig. 33-Brush Plate Assembly
on it in the same location as the one scribed on the
old case. This will insure proper alignment of the
new case with the scribed line made on the housing
(Step 1 under Brush Plate Removal).
9. Position armature worm shaft inside the housing
and, using the scribed reference marks, line up as
near as possible the case and field assembly with
the housing.
10. Maintaining the armature in its assembled position
in the case, start the armature 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 may be necessary at this point to
rotate armature 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 armature end-play as described under
"W iper Adjustments".
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 26) and tighten
the adjusting screw until finger tight, tighten locknut.
G ear Assem bly End-Play
Add end-play washers as required to obtain .005"
minimum end-play (Figure 26).
W A SH ER P U M P
The washer pump and/or valve assembly may be
Fig. 34-Washer Pump Assembly
removed from the wiper assembly as a unit; therefore, it
is not necessary to remove the wiper assembly from the
vehicle if only the washer pump and/or valve assembly
requires service.
When the pump is removed from the wiper assembly, all
working parts are readily accessible and may easily be
serviced as necessary (fig. 34). A cross-section of the
washer pump valve assembly is shown in Figure 35.
Replacement
1. Raise vehicle hood and disconnect ground cable
from battery.
2.
G Models
- Remove left heater duct attached to
engine shroud, for access.
3. Disconnect washer hoses and electrical connections
from assembly.
4. Remove three screws securing washer pump and
cover to wiper assembly. Remove pump from wiper
gear box.
5. To install, reverse Steps 1-4 above.
Pump Valve
Replacement
1. G Models
- Remove the washer pump as outlined
above.
C-K Models
- Raise hood. Disconnect washer hoses
and electrical connections from assembly.
2. Remove the four screws that attach the valve
assembly to the pump housing.
CAUTION:
During re-assembly be sure gasket
between housing and valve plate is properly
positioned in the housing and valve plate
grooves. Also be sure triple "O" ring is properly
installed between valve and pipe assembly.
3. To install, reverse removal procedure.
SPRING POSITIONED
IN GROOVE OF SHAFT
R E L A Y A R M A T U R E
A R M A T U R E L E G
A R M A T U R E
S P R I N G
D O G R A T C H E T
R A T C H E T W H E E L
P A W L S P R I N G
II
R A T C H E T P A W L
I T A N G O F S P R I N G
18
* A C T S A S T O O T H
O F R A T C H E T W H E E L
LIGHT DUTY TRUCK SERVICE MANUAL