CHAPTER 1: INTRODUCTIONTM 9-2350-256-201-24 APU-Continuedc. LUBRICATIONA gear-type pump draws oil from the crankcase anddelivers it through a replaceable oil filter to the engine.Normal oil pressure should be 25 psi (172 kPa) orhigher under normal operating conditions. Acrankcase oil drain valve with operating handle isprovided to drain the lubricating oil without removingthe unit from the vehicle.d. GOVERNORConstant speed is set to maintain engine speed at 2000100 rpm. The governor uses a ball-and-cupmechanism on the camshaft gear as the sensing device.A yoke resting on the cup connects to an arm-and-spring mechanism controlling the throttle lever. Anychange in engine speed is transmitted from the cup tothe yoke and to the throttle. The speed may beadjusted by changing the spring tension.e. FUEL SYSTEMThe fuel system consists basically of a primary andsecondary fuel filter, fuel transfer pump, injectionpump, and injection nozzle. The transfer pump,operating off the camshaft, draws fuel from the supplytank and delivers it through the two filters to theinjection pump. The injection pump meters anddelivers the fuel at high pressure to the nozzle.1-25 M8A3 GPFUThe GPFU installation in the M88A1 vehicle is made up of two separate M8A3 systems. One M8A3 GPFU serves thepersonnel on the left side of the vehicle and is operated by the driver. The other M8A3 GPFU serves the commander,mechanic, and rigger with the control switch located at the mechanic's station. Electrical power for operation of thepurifier units is obtained by tapping into convenient dome light power leads.1-32
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