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 78 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-16.
TRANSMISSION.
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 transmission.
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 transmission oil temperature circuit when load exceeds 20
amperes.
May be manually reset by pressing CB-2 button in.
TRANSMISSION OIL TEMPERATURE GAGE.
Signal from sending unit actuates pointer gage, showing transmission oil
temperature.
TACHOGRAPH.
Receives signals from speedometer and tachometer cables and shows MPH, RPM, and miles driven.
Also, records this data on 7-day disk pack.
(Refer to para 3-309 for more information on tachograph disk pack).
TRANSMISSION OIL TEMPERATURE SENDING UNIT.
Provides electrical signal to temperature gage for indicating
transmission oil temperature.
1-58
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