THEORY OF OPERATION Continued
OIL COOLING SYSTEM COMPONENTS ENGINE, TRANSMISSION, AND DIFFERENTIAL
The M548A1 engine, transmission, and differential oil cooling systems keep the oil clean and within proper operating
temperature range. The components of the system are the 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 to the
differential oil filter. Oil flows through the filter and cooler and back to top of differential. a power takeoff within the transfer
gearcase drives the differential oil pump.