ENGINE AIR SYSTEM - TM-9-2350-277-20-1

THEORY OF OPERATION - TM-9-2350-277-20-1_75

TM-9-2350-277-20-1 Hull Powerpack Drive Controls Tracks Suspension and Associated Components Carrier Ammunition Tracked Manual
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TM 9-2350-277-20-1 THEORY OF OPERATION — Continued 0003 00 approximately 14.8 gallons of liquid coolant. The liquid coolant is cycled through the engine and transmission oil cooler by the coolant pump. This process keeps the engine and transmission temperature in a safe operation range. As coolant flows through the engine, it absorbs heat from the engine and transmission. The heated coolant then flows to the radiator to remove coolant heat. The coolant fan pulls outside air in and through the radiator to remove heat. The fan is powered by the engine through a fan drive. The radiator auxiliary tank acts as an overflow tank to keep the cooling system from overpressurizing. It also removes air from the engine coolant. There is a low coolant level transmitter to signal the operator if more coolant is needed. ENGINE AIR SYSTEM The engine air system allows air to enter the engine. The air cleaner cleans air that enters the engine. Dust is drawn out through a scavenge outlet. Air is filtered through a reusable filter element before delivery to the engine. An air filter indicator shows when the element is clogged and needs cleaning or replacing. After being filtered, the air moves through the turbocharger and into the engine cylinders. AUXILIARY AUTOMOTIVE SYSTEM The auxiliary automotive system includes driver controls, fuel cells, personnel heater, bilge pumps, crew ventilation system, and fire suppression system. DRIVER CONTROLS The driver controls regulate the engine, transmission, and steering braking systems of the carrier. The fuel shutoff control is used to stop the supply of fuel to the engine injectors. To start the engine, the driver must open the valve. The throttle linkages are used to control the engine speed. The gear selector allows the driver to choose the proper gear for the carrier. The steering system controls the direction of the carrier. The steering control consists of a steering wheel and linkage connected to the transmission. The brake system allows the driver to stop a moving carrier and hold the carrier in position. The braking system consists of the service brake and the parking brake. The service brakes are hydraulic and applied by pedal. The parking brake mechanically locks the transmission brakes to prevent carrier movement. Also, the system has levers, rods, shafts, and linkages connecting to the brake shaft of the transmission. PERSONNEL HEATER The personnel heater system provides heat inside the carrier. Major parts are the combination combustion chamber/heat exchanger, blowers, a fuel pump, and an electrical control and safety system. The heater operates using diesel fuel drawn from the fuel tanks. Fuel is delivered to the combustion chamber from the fuel pump. Outside air is drawn into the combustion chamber by one of the blowers. A blower draws air from the crew compartment into the combustion chamber. The air is warmed by heat by the combustion process and then returned to the crew compartment. BILGE PUMPS Two electrically driven bilge pumps remove water and other liquids from the hull. Water enters the pumps through a screened inlet. The pumps force water out of the carrier through outlet tubes. The bilge pumps are controlled by a switch on the driver’s instrument panel. HYDRAULIC SYSTEM The ramp is raised or lowered by an hydraulic system which consists of a pump, a cylinder, a control valve, and an hydraulic tank. This system is controlled by a three position valve located near the driver. Moving the valve to either RAISE or LOWER position directs fluid to the appropriate port on the ramp cylinder. 0003 00-2

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