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 232 of 1313
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 to protective control box through circuits 459, 81A,
and
81.
B. PROTECTIVE CONTROL BOX
- Energizes ether feed switch through circuits 5, 5A, 27, 5C, and 570.
C. ETHER FEED SWITCH
- Controls 24-volt power to ether pressure switch through circuit 570.
D. ETHER PRESSURE SWITCH
- Connects ether feed switch to ether tank valve through circuit 570.
E. ETHER TANK VALVE
- Is activated through circuit 570 when ether pressure switch is closed and ether
feed switch is pressed.
E
D
C
B
A
CB
5A
27
5C
570
570
570
569
81A
459
5
81
G0031DAA
BATTERY
Figure 19.
Ether Starting System Components.
TM 9-2320-272-23-1
0003
0003-27
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