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DISASSEMBLY PERMANENT
MAGNET TYPE TWO SPEED
ELECTRIC WIPER MOTOR
1. Remove the clamp nut (1),
Motor Crank, Assembly (2), Wave
Washer
(21),
Flat Washer
(7),
Grom-
met Insert
(
4) and Mounting Seal (3).
2. Clean the gear housing of old
grease. Do not allow cleaning fluid
to contact the armature shaft and
output
shaft
·
bearings. Wipe all
other parts
with
a clean cloth.
3. Remove the two screws (15),
lockwashers
(16)
and motor housing
assembly
(20).
Do not pound the
Motor housing assembly as the
ceramic magnets may be damaged.
Remove the ball
(18)
and thrust pad
assembly
(19).
4. Note: That the ball may have
dislodged and become attracted to
the magnets during the dismantling
operation, and it is essential
that this
item is located.
5. Retract the brushes (13)
and
withdraw the armature assembly (17)
and thrust cone
(9).
6. Remove the four screws (12),
4
PART 15-4· INSTRUMENTS
Terminal
(11)
and Washer Pump
Assembly (10).
7. Disconnect the feed wire
(minia-
ture
terminal) from the wiper motor.
8. Remove the gear and shaft
assembly
(8)
and distance washer (7).
9. Insert
screwdriver
in
slot
at
base of terminal block assembly
(5).
Prise upwards to free terminal block
assembly, unsolder wires and remove
from
housing
(6).
10. Remove
self-tapping
screw
(23)
and
earth finger
(22).
INSPECTING AND TESTING THE
DISASSEMBLED MOTOR
1. Cover motor housing bearings
and blow dust from interior with
compressed air.
2. Visually inspect for damage to
the ceramic magnets-replace motor
housing assembly
if
necessary.
3. Visually inspect the armature
assembly for burned commutator
bars, galling or pitting of the arma-
ture shaft bearing area and worm
gear for
scoring.
Check thrust ball for
pitting, balling or discolouration due
6
3
s
~
t
~\2
'0
FIG. 24
15-19
to heat. Replace if necessary.
4. Test for grounded armature.
Obtain a test lamp and battery, con-
nect one probe to the armature
shaft
or armature stack, and touch each
commutator segment in turn with the
other probe. The lamp should NOT
light. If the lamp lights the armature
is grounded and must be replaced.
5. Inspect the brush holder plate
for cracks or damage. Ensure that
brush boxes are secure and that con-
nections are not burned or corroded.
6. Replace motor brushes that are
worn down to
f
long. Examine brush
springs for distortion, burning or
collapse. Normal brush spring len-
gth is 1!" minimum. Replace
if
necessary.
7. Examine the gear housing for
cracks and distortion, and the bear-
ings for excessive wear. Examine the
three parking fingers for loss of
tension, burning or pitting. Replace
gear housing assembly if necessary.
8. Examine the gear and shaft
assembly for worn or damaged teeth.
Check cam for wear on face. Replace
7
8
~
ITEM
DESCRIPTION
ITEM
DESCRIPTION
1
Housing Assembly
2
Solenoid Assembly
3
Suction Cap
4
Plunger
5
Trim Cup
6
Cover
7
Valve
Cover
8
Valve Seat
9
Valve Seal
10
Valve Rubber
11
Screw
12
Plunger
&
Lever Assembly
13
Bush
14
Spring
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