TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 38 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-12.
FUEL SYSTEM.
a.
Fuel Delivery.
BATTERY PACK.
Consists of four, 12-volt,
maintenance free batteries.
Two batteries are wired in parallel in each set.
Each set is connected in series for 24-volt
output.
Battery
pack
is used
for both
12-volt
and 24-volt output.
IGNITION
SWITCH.
Supplies
24-volt
power to
relay (RY-9), which
in turn provides 12-volt power to electrical system,
including fuel system circuit.
SOLENOID SHUTOFF VALVE.
Normally closed, shutting off fuel supply to engine.
Open when ignition switch is ON.
RELAY
(RY-9).
Energized
by
24-volt
power
from ignition
switch.
When energized, RY-9 supplies 12-volt power to
circuit breaker (CB-2).
CIRCUIT BREAKER
(CB-2).
Protects electrical
components of
fuel system by opening circuit when load exceeds 20
amperes.
May be manually reset by pressing CB-2 button.
FUEL GAGE.
Actuated by electrical signal from fuel sending unit which shows level of fuel in tank.
FUEL
LEVEL SENDING
UNIT.
Provides
electrical
signal
to
fuel gage
for indicating fuel quantity in tank.
FUEL TANK.
118 gallon capacity (100 gallon draw).
FILTER
AND WATER SEPARATOR.
Throwaway filter
removes impurities and water from fuel.
Petcock at
bottom
allows operator to drain
off water
filtered from fuel.
FUEL PUMP.
Gear driven
by air compressor.
Built-in governor
meters fuel through screen filter, solenoid
shutoff valve,
and into injectors.
Excess fuel from
pump is
returned to tank.
A tachometer
drive is located on the fuel pump
housing.
1-18
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