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8-22
STARTING MOTOR-DIRECT
DRIVE
they do not touch the solenoid connector (Fig. 3 ) .
(4) Remove the ground brushes attaching screw,
and raise the brushes with terminal and shunt wire
up and away from the field frame.
(5) Touch one probe of the test lamp to
the series
field coil lead and the other probe to the field frame
(Fig. 10). Lamp should not light.
(6) Touch one probe to the shunt field coil lead
and the other probe to the field frame (Fig. 11).
If the lamp lights in either
test
(5) or (6), the field
coils are grounded. If field coils are grounded,
test
each coil separately after unsoldering the connector
wires. Replace grounded field coils.
(7)
Touch each of the brush holders with one test
probe, while holding the other test probe against the
brush ring. Two brush holders that are 180 degrees
apart should cause test lamp to light as they
are
in-
tentionally grounded. The other two brush holders
(Fig. 12) should not cause lamp to light when tested
as they are insulated. If the insulated brush holders
cause lamp to light when tested, it indicates that the
brush holders on the brush ring are grounded. Re-
place the brush ring assembly if the brush holders
are grounded.
REPLACING THE FIELD COILS
A pole shoe impact screwdriver Tool C-3475 should
be used to remove and install the field coils to pre-
vent damage to the pole shoe screws and for proper
tightening.
Pole shoes that are loose and not properly seated
may cause the armature core to rub on the pole shoes.
This will decrease starter efficiency and damage the
armature core.
NOTE:
Scribe a mark on the pole shoe and field
frame to ensure the pole shoes are assembled in
their original position.
TEST
PROBES
SHUNT
LEAD.
Fig. 7 l-Testing
Shunt Coil for o Ground
I
I
I
n
' . -
INSULATED BRUSH
',
i
I
HOLDERS
Fig. 12-Testing
lnsuloted Brush
for a
Ground
\
6 1 x27
Holder
SERVICING THE BUSHINGS
Inspect the armature shaft bearing surfaces and
bushings for wear by placing the armature core in a
vise equipped with soft jaws. Do not squeeze tightly.
Try the commutator end frame, the drive end frame,
and armature support bushings for wear by placing
them on shafts and checking for side play. Replace
the commutator end frame and bushing assembly if
the bushing is worn. Also, replace the drive end bush-
ing if it is worn. The bushing should be well soaked in
SAE 30-W engine oil before it is installed. The new
pre-sized bushing should be pressed into the housing
until the bushing is flush with the inner side of the
housing to provide proper clearance. Use Tool C-3944
to remove and install the bushing.
SERVICING THE DRIVE UNIT
Place the drive unit on the armature shaft and,
while holding the armature, rotate the pinion. The
drive pinion should rotate smoothly in one direction
(not necessarily easily), but should not rotate in the
opposite direction.
If the
drive unit does not function
properly, or
if
the pinion
is
worn or burred, replace
the drive unit.
ASSEMBLING THE STARTING MOTOR
(Refer
to
Figure 1)
(1) Lubricate the armature shaft and splines with
SAE 10-W oil or 30-W rust preventative oil.
(2)
Install the starter drive, stop collar (retainer),
the lock ring and spacer washer.
(3) Install the shifter fork over the starter drive
spring retainer washer with the narrow leg of the
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