OIL PUMP

SECTION III: PRINCIPLES OF OPERATION - TM-9-2350-256-20_32

TM-9-2350-256-20 Carrier Cargo Tracked 6-Ton M548A1 (2350-01-096-9356) M548A3 2350-01-369-6081 Manual
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CHAPTER 1: INTRODUCTION TM 9-2350-256-20 1-13 LUBRICATION SYSTEM -Continued c. OIL PUMP The oil pump assembly consists of four sections combined as a single unit. The twin scavenge oil pump section of the unit picks up oil from the front end compartment of the oil pan and delivers it to the main pressure oil pump compartment. The main pressure oil pump section picks up oil from its respective compartment and supplies oil to the engine oil galleries and bearings, and to the piston oil sprayer nozzles. The level in the pressure pump compartment is maintained by a dual-inlet leveling pump which returns any excess oil to the reserve compartment. Oil is pumped from the reserve compartment by two makeup pumps in a single section. These pumps pick up oil from opposite comers of the reserve compartment and discharge it into the pressure pump compartment. The dual pump design ensures return of oil from the reserve compartment under all operating conditions (cold oil, slope operation, etc.). d. OIL FILTERS AND CONTROL VALVES The engine oil filters and the bypass valve are located in the crankshaft damper and oil filter housing at the front of the engine. All engine oil passes through the oil filters. The oil filter bypass valve opens at the differential pressure of 35.6 psi (245 kPa). The bypass valve permits oil to bypass the filters in the event that they become clogged. e. CRANKCASE BREATHER SYSTEM The engine crankcase breather system is completely enclosed, which allows the engine to be submerged without the entrance of water and permits the crankcase to be vented. The breather system is vented through the left turbocharger exhaust outlet into the vehicle exhaust system. f. ENGINE AND TRANSMISSION OIL COOLERS All transmission and engine oil cooling is accomplished by external oil coolers. The oil coolers are located on the sides of the engine, above the cylinders. Air is drawn through the oil coolers by the cooling fans. A thermostatic bypass valve in each oil cooler controls the temperature of the oil from the cooler by permitting cold oil to bypass the coolers. This valve also permits oil to bypass the cooler in the event the cooler becomes clogged. 1-14 FUEL SUPPLY, AIR INTAKE, AND EXHAUST SYSTEMS a. FUEL SUPPLY SYSTEM Three fuel tanks supply fuel to the engine, the APU, and the refuel system. Two tanks are adjacent to the engine, one on either side, and the third tank is forward of the bulkhead in the winch compartment. A system of four manually operated control valves maintains fuel flow through the check valve and directs fuel to the engine and refueling systems. These valves are also used to drain the fuel tanks. NOTE The following callouts are found in Figure 1-7. The fuel from the vehicle fuel tanks is supplied at a minimum pressure of 5 psi (34 kPa) to the primary fuel filter (3), which is mounted on the engine right front. Fuel flows through the main fuel check valve (5) to the fuel pump assembly (7) mounted on the front center of the engine. This is an engine-driven, gear-type pump; it boosts fuel pressure to the fuel injector pump. A relief valve is incorporated in the pump as a pressure-limiting safety valve. 1-20

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