SERVICE MANUAL
Fig. 8. Electric Windshield Wiper Motor (External View)
CAUTION: DO NOT attempt to move the wiper
blades through their sweep by grasping the wiper arm.
This action may result in the teeth being broken off the
drive gear or the linkage bent. If blades are frozen to
wind- shield, do not operate control switch until they have
been freed.
DISASSEMBLY
To facilitate reassembly of the wiper, it is
suggested that parts be laid on a clean bench in the
order in. which they are removed. All key numbers used
in "Disassembly" and "Reassembly" procedures refer to
Fig. 7.
Disconnect linkage from
wiper
motor
and
remove bolts holding mounting bracket to cowl. Remove
wires from control switch and lift out motor assembly.
Remove bolts holding mounting bracket to drive end
housing (3). Remove drive end cover (11). Take out
parking switch contact plate (9) from drive end housing
(3). See Fig. 9.If parking switch assembly is to be
replaced, unsolder the field coil leads from the switch
terminals. It is important that you note to which terminal
each Lead is connected.
Remove drive gear shaft nut and washer. Take
crank arm off of drive shaft. When removing nut from
drive shaft, crank arm must be supported to prevent
stripping of the gear teeth. This may be done by
inserting crank arm in a vise or grasping it with pliers.
Remove drive gear and shaft assembly (5).
Take parking cam (8) and spring washer from gear and
shaft assembly (5), if necessary. Take notice of the
direction in which the dotted end of the cam faces (Fig.
9).
Fig. 9. Removing Drive Housing Cover Plate and Switch
Contact Plate
1.
Reassembly Matching Mark
Remove the two thru bolts holding the drive end
housing (3) and commutator end frame (16) to the wiper
motor housing (12). See Fig. 10.
Separate the commutator end frame (16) from
the motor housing (12). Carefully lift the brushes (15)
clear of the armature commutator and hold them in this
position until the commutator end frame (16) is removed
from the armature shaft (18).
A tool for holding the brushes in the holders may
be
made
from
.040"-.050"
diameter
piano
wire
approximately 10" long. Form each end of the wire into a
U-shaped hook. By inserting the hooks under the brush
shunts, the brushes will be forced back into the holders.
If a field coil lead is soldered to a terminal on the
insulated brush holder, it will be necessary to unsolder
this lead to replace the commutator end frame (16).
Fig. 10. Motor Housing and Related Parts
CTS-4056-Chapter II
PRINTED IN UNITED STATES OF AMERICA
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