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TM 9-2350-287-34 1-16.  EQUIPMENT OPERATION (continued). APU The  APU  is  an  11.5-horsepower,  overhead  valve,  two-cylinder,  four-cycle,  air-cooled  diesel  engine  used  to  drive  an electrical generator and the hydraulic pump. The  chain-driven  generator  is  used  to  recharge  the  batteries  and  provide  electrical  power  for  the  operation  of  M992A1 components and a supported howitzer. The hydraulic pump powers hydraulic system components. HYDRAULIC SYSTEM OPERATION The hydraulic system operates the upper rear door and conveyor assembly.  The APU drives the hydraulic pump, which is capable of delivering 4.5 gallons per minute of flow at a system pressure of 1550 psi.  Hydraulic fluid is pumped from the 13- gallon-capacity    hydraulic    reservoir    to    the    hydraulic    control    panel.        The    hydraulic    control    panel    contains    two electromechanically  activated  directional  control  valves.    The  upper  directional  control  valve  controls  the  upper  rear  door actuator,  extending  or  retracting  the  actuator  to  open  or  close  the  upper  rear  door.    The  lower  directional  control  valve controls  the  conveyor  motor  for  forward  or  reverse  travel  of  the  conveyor  chain.    The  hydraulic  control  panel  also incorporates a pressure gage that indicates system pressure.  The conveyor control switch actuates the conveyor solenoid at the conveyor control valve. Change 1  1-23

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