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 36 of 1015
TM 9-2320-272-24-l
l-20. CONTROL SYSTEM OPERATION (Contd)
a.
Starting and Ether Starting System Operation.
The starting system is identical on all models covered in this manual. It will start the engine in all types
of weather and has built-in protection that prevents starting components from reengaging once the engine
has been started. Major components of the starting and ether starting system are:
Key
1
2
3
4
5
6
7
1-26
Item and Function
HAND THROTTLE CONTROL
- Used to set engine speed without applying pressure to the
accelerator (rotated to lock).
BATTERY SWITCH
-Activates all electrical circuits except arctic heaters.
IGNITION SWITCH
- Has OFF, RUN, and START positions. Switch automatically returns from
START to RUN when hand pressure is released.
TACHOMETER
- Indicates speed of engine.
VOLTMETER
- Indicates charging condition of the battery.
EMERGENCY ENGINE STOP
- Control used to shut down engine during emergencies (M934/A1
series vehicles must be reset by unit maintenance).
ETHER START SWITCH
- Injects ether into engine for cold-weather starting.
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