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 36 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-11.
ENGINE (Continued).
b.
Engine Oil Monitoring System.
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 oil pressure gage and warning lamp circuits.
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
oil system
by opening circuit when load exceeds 20
amperes.
May be manually reset by pressing CB-2 button in.
OIL PRESSURE GAGE.
Activated by electrical signal from oil pressure sending unit.
Indicates engine oil pressure.
OIL PRESSURE SENDING UNIT.
Provides electrical
signal to oil pressure gage to indicate engine oil pressure.
OIL WARNING LAMP.
Indicator lamp is activated by 12-volt power from pressure switch when engine oil pressure drops
below 5 psi.
PRESSURE SWITCH.
Closes to supply 12-volt power to oil warning lamp when oil pressure drops below 5 psi
TA 236756
1-16
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