TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 45 of 481
TM 9-2320-272-10
1-28
1-17. 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:
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
– Used to indicate speed of engine.
VOLTMETER
– Indicates charging condition of the battery.
EMERGENCY ENGINE STOP
– 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.
G
F
E
D
C
B
A
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