TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 16 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
e.
Starter Motor and Solenoid.
The starter motor is a 24-volt, water-resistant motor with an electric shift
engagement, overrunning clutch drive.
The water-resistant solenoid switch is mounted on the motor field ring.
The
solenoid switch actuates the clutch drive through a hinged yoke and linkage assembly.
When the START button is pressed, two circuits in the solenoid switch are energized: the pull-in coil and the hold-in
coil.
The solenoid switch moves the drive assembly into mesh with the engine flex disk and ring gear (flywheel) and, in
the proper sequence, closes the cranking contacts in the switch.
When the cranking contacts close, the pull-in coil is
then in parallel with the contacts and no current flows in this circuit.
The hold-in coil holds the cranking switch closed and
also holds the pinion in the cranking position.
When the engine starts, the overrunning clutch in the drive allows the
pinion to run free until the START button is released.
At this time the solenoid switch is deenergized and the drive
returns to an at-rest position by the return spring in the solenoid switch.
TA238041
1-5
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