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 67 of 481
TM 9-2320-272-10
1-50
1-19. ELECTRICAL SYSTEMS OPERATION (Contd)
c. Ether Starting System Operation.
The ether starting system is identical for all models covered in this manual
and consists of the following major components and circuitry:
A
BATTERY SWITCH
– Provides 24-volt battery power to the protective
control box through circuits 459, 81A, and 81.
B
PROTECTIVE CONTROL BOX
– Energizes the ether feed switch through
circuits 5, 5A, 27, 5C, and 570.
C
ETHER FEED SWITCH
– Controls 24-volt power to the ether pressure
switch through circuit 570.
E
ETHER TANK VALVE
– Is activated through circuit 570 when the ether
pressure switch is closed and the ether feed switch is pressed.
D
ETHER PRESSURE SWITCH
– Connects the ether feed switch to the ether
tank valve through circuit 570.
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