TM 9-4310-394-13Section I. DESCRIPTION AND USE OFOPERATOR'S CONTROLS AND INDICATORS2-1. INTRODUCTION. The air compressor unit is designed for operation in a wide range of climatic conditions.Operators must be aware of any peculiarities or operational limitations for their specific installation. Before setting upand operating this system, be sure that you have determined the type of terrain and climate in which you will use the unitand that you have assembled and serviced the system to match the existing needs.2-2. OPERATOR'S CONTROLS AND INDICATORS. For controls and indicators applicable to the ACU, refer to thefollowing descriptions and to Figure 2-1.a.AirPressureGauge(1). An air pressure gauge is mounted on the tank to determine the pressure of thecompressed air stored inside of the receiver tank.b. AirTankDrainCock(2). A drain cock is attached to the bottom of the air tank to allow water to be drained fromthe tank and to allow compressed air to be removed from the tank when maintenance must be performed on the tank.c. ColdWeatherPlug(3). During ACU operation in colder weather, engine starting can be further helped byremoving the cold weather plug on the top of the engine rocker arm cover and adding 5 or 6 drops of engine oil. Thisreduces the additional friction caused by colder weather and makes the engine easier to start.d. CompressorLubeOilDrainPlug(4). In the event that the compressor oil must be changed, the oil can bedrained from the unit by removing the drain plug and allowing the oil to drain down the drain pan into a suitable container.e. DecompressionHandle(5). Because of the high internal cylinder pressure inside a diesel engine, it can bedifficult to start manually since the operator must overcome this internal pressure to start the engine rotation. To relievethis internal cylinder pressure for starting purposes, an engine decompression handle is furnished to vent the cylinderpressure and allow for easier engine starting.f.DieselEngineSpeedControlKnob(6). After the diesel engine has been started, the engine speed can becontrolled by loosening the engine speed control knob, moving it to desired speed, and then tightening speed controlknob.g.EngineOilDipstick(7). To provide a method of checking for the correct amount of oil in the diesel engine, theengine is equipped with an engine oil dipstick. By removing this dipstick and checking the indicated oil level, properengine oil may be added as needed. Engine oil is added through the engine oil dipstick opening in the engine crankcase.h.FuelFilterHandle(8). When maintenance must be performed on the fuel filter, a handle on the side of the fuelfilter can be used to turn off the fuel flow from the fuel tank.i.FuelTankDrainPlug(9). There are times when the fuel must be removed from the fuel tank. To accomplishthis task, a fuel tank drain plug is located on the bottom of the fuel tank.j.FuelValve(10). To control the flow of fuel from the fuel tank or auxiliary fuel source to the engine, a three wayfuel valve is included to select which fuel source is to be used.k.FuelTankGauge(11). The amount of fuel in the engine fuel tank is shown by a fuel gauge located on the topof the fuel tank.2-2
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