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TM 10-3930-644-14&P
TOPIC 4. STARTER MOTOR
A. DESCRIPTION
responds instantly and cranks engine when the
ignition switch is closed, the starter motor may
The starter motor is designed to operate under overload
be considered to be in satisfactory working
conditions and to produce high torque. Because of its
condition.
limited physical size it can only do this for short periods
of time, since in order to produce such power a high
NOTE
electrical current must be used.  High current creates
The starter motor is equipped with
considerable heat and if the starting operation is
graphite
and
oil
impregnated
continued for any length of time, the accumulated heat
bushings which should be lubricated
will cause serious damage.
only when motor is disassembled.
C. REMOVAL
CAUTION
Starter must never be used for more
1. Lift operator's seat and swing open side panel.
than 30 seconds at any one time.
Allow starter motor to cool for 2
2. Disconnect battery cable leads at battery to
minutes before using again. Never
guard against possible electric shock during
use starter to move truck.
removal.
The drive mechanism incorporates a locking feature
which prevents demeshing of the drive pinion from the
3. Disconnect and label all electrical connections at
flywheel ring gear, until a predetermined flywheel speed
starter motor.
is reached. The automatic meshing of the drive pinion
with the flywheel ring gear is accomplished in the usual
4. Remove mounting bolts which secure starter
manner. If the engine fails to continue running, due to
motor to flywheel housing.
weak or irregular firing, premature demeshing of the
pinion from the ring gear is prevented by the locking
5. Carefully pull starter motor assembly out of
feature.
flywheel housing until drive end clears flywheel
housing, then tilt commutator end up to remove
A magnetic solenoid switch is used in the starter motor
unit from truck.
circuit since It uses less electrical current, and allows
use of a starter switch and lighter gauge wiring.  The
NOTE
starter solenoid is mounted on the starter housing.
For DISASSEMBLY, INSPECTION, RE-PAIR
and  REASSEMBLY,  refer  to  REPAIR
The starter motor is a completely enclosed unit and
MANUAL.
requires very little maintenance.  However, to ensure
satisfactory operation, periodic inspections should be
D. INSTALLATION
made to make sure mounting and wiring connections are
tight and in good condition.
1. Insert drive end of starter motor in flywheel
housing. If drive mechanism is fully extended,
B. INSPECTION
then mesh pinion gear with flywheel ring gear.
1. Verify that starter motor electrical connections to
2. Install mounting bolts and tighten securely.
battery are clean and tight.
3. Connect all electrical leads to starter motor as
labeled.
NOTE
Loose or dirty connections anywhere
4. Connect battery positive lead to positive post
in the electrical circuit will cause high
and negative lead to negative post.
resistance  and  reduced  cranking
efficiency.
5. Close side panel and lower operator's seat.
2. When all mounting and wiring connections are
kept in good condition, and the starter motor
M-146-1
2-27

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