TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 207 of 1313
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:
A. BATTERY SWITCH
- Activates all electrical circuits except arctic heaters.
B. IGNITION SWITCH
- Has OFF, RUN, and START positions. Switch automatically returns from START
to RUN when hand pressure is released.
C. TACHOMETER
- Indicates speed of engine.
D. VOLTMETER
- Indicates charging condition of the battery.
E. EMERGENCY ENGINE STOP
- Control used to shut down engine during emergencies (M934/A1 series
vehicles must be reset by Field Maintenance).
F. ETHER START SWITCH
- Injects ether into engine for cold-weather starting.
G. HAND THROTTLE CONTROL
- Used to set engine speed without applying pressure to the accelerator
(rotated to lock).
G0013DAA
G
A
B
C
D
E
F
Figure 1.
Starting and Ether Starting Components.
TM 9-2320-272-23-1
0003
0003-2
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