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Figure 1-5.  Connection Diagram for 220v or 440v, D-6A
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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CHAPTER 2 OPERATING INSTRUCTIONS - TM-1-4920-446-13P_18
TM 1-4920-446-13 & P b.  A thermoswitch in the high pressure pump shuts down the unit when fluid temperature exceeds 160°F. c.    Low  pressure  switches  protect  the  high  pressure  pumps    against  cavitation  due  to  low  inlet  pressure  or  boost pump failure.  If the pressure drops below 40+5 psig, the unit is automatically shutdown. d.  Check valves prevent reverse flow of hydraulic fluid. e.  Differential pressure switches across filter ports of the high and low pressure filters illuminate warning lights on the control panel to indicate a clogged filter. f.  A circuit breaker is provided for overload protection of various circuits.  Refer to Figure C-4 for location of electri- cal components and Figure 1-3 for wiring schematic. g.  Complete instrumentation and controls are located on the control panels.  Refer to Chapter 2, Figure 2-2 and Ta- ble 2-1 for description of function and location. 1-21.    Electrical System (Figure 1-3).  The system provides the circuits and control for proper functioning of electrical components.  Electrical power is supplied by an external source through the external electrical cable. 1-22.    Equipment  Data.  The  equipment  data in Table  1-1 summarizes  the specific capabilities and limitations on the equipment. SECTION III.  PRINCIPLES OF OPERATION 1-23.  Simplified Principles  of Operation.  (Figure  1-4.)  The boost pump  receives fluid from the aircraft through the suction return port and flowmeter.  The output of the boost pump is passed through the low pressure filter to the suction side of the high pressure pump.  The boost pump pressure is controlled by the low pressure relief valve.  The output of the  high  pressure  pump  is  passed  through  the  high  pressure  check  valve,  high  pressure  filter,  flow  control  valve,  and pressure  outlet  to  the  aircraft.    The  output  pressure  is  controlled  by  the  high  pressure  relief  valve  and  a  compensator control on the high pressure pump.  The  output is controlled by  the flow control valve, and regulated by a volume con- trol on the high pressure pump. NOTE Before operation ensure test stand is wired for 220 volt operation. 1-11/(1-12 blank)

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