TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 37 of 1015
TM 9-2320-272-24-l
l-20. CONTROL SYSTEM OPERATION (Contd)
Key Item and Function
8
PROTECTIVE CONTROL BOX
- Prevents reengagement of starter motor once engine is running.
9
BATTERIES
- Provide 24-volt electrical current for energizing electrical circuits.
10
STARTER SOLENOID
- Relays 24-volt battery power to energize starter motor.
11
STARTER MOTOR
- When energized, converts electrical energy to mechanical power as it engages
flywheel to crank engine.
12
ETHER START CYLINDER
- Stores ether used for cold-weather starting.
l-27
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