OIL SYSTEM

C H A P T E R 2 P R I N C I P L E S O F O P E R A T I O N

TM-9-2350-261-20-1 Carrier Personnel Full Tracked Armored M113A2 2350-01-068-4077 Carrier Command Post Light Tracked M577A2 2350-01-068-4089 Manual
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TM 9-2350-261-20-1 OIL SYSTEM The engine, transmission, and differential oil cooling system keeps the oil clean and within proper operating temperature range. The components of the system and their fictions are: Engine, transmission, and differential oil cooler unit is mounted on the engine. By circulating the hot oil through this unit, heat is given off to the surrounding engine coolant. Engine coolant is in turn cooled by the engine cooling system. Oil cleanliness is maintained by circulating engine oil through the engine oil filter, and differential oil through the differential oil filter. Transmission oil is cleaned by the transmission oil filter which is an integral part of the transmission. Differential oil pump is mounted on the transfer gearcase. It pumps oil from the bottom of the differential housing and to the differential oil filter. Oil flows through the filter, cooler, and back to the top of the differential. FUEL SYSTEM Diesel fuel is stored in the fuel tank located inside the carrier. Fuel is gravity fed to the primary fuel filter. The engine driven fuel pump draws fuel from the primary fuel filter and pumps fuel through the secondary fuel filter to the engine injectors. The injectors force fuel into combustion cylinders where it is mixed with air and changed into energy. The excess fuel is returned to the fuel tank. External fuel tanks are mounted on rear of carrier and hold about 95 gallons of diesel fuel. Shutoff cocks are located inside of earner at each connection. Turn fuel on and off for maintenance (M981 only). TRANSFER GEARCASE The transfer gearcase transfers power from the engine to the transmission. The transfer gearcase is a compact unit that transfers power from the engine flywheel to transmission torque converter. An engine disconnect allows the engine to run without transferring power to the transmission. A power takeoff drives the differential oil pump and a ramp pump. Another power takeoff drives the cooling fan, and a third drives the generator. 2-2

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