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CHAPTER 1 INTRODUCTION - TM-1-4920-446-13P_7
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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Figure  1-1.  Test Stand Hydraulic System Electric Motor Drive, Type-D-6A
TM 1-4920-446-13 & P SECTION II.  EQUIPMENT -DESCRIPTION AND DATA 1-8.  Physical Description. a.  The test stand (Figure 1-1) incorporates one hydraulic piping system and a high pressure pump.  The pump is driven by a 20 horsepower, 220/440 volt, 60 hertz, 3-phase motor. NOTE Left and right sides are determined standing at the towbar and facing the test stand. b.  Operator's controls and instruments are located at the right rear side of the test stand.  The electrical components box is located at the right front side of the unit.  External hose connections are located on the rear frame.  Two U-shaped hangers are located on the cabinet front panel to stow the hydraulic hoses. 1-9.  TEST STAND  CAPABILITIES. a.  The stand is capable of supplying 0 to 10 gpm (gallons per minute) of hydraulic fluid at 3000 psi (pounds per square inch), or 0 to 5 gpm at 5000 psi. b.  The test stand is mounted on a four wheel trailer and is completely mobile.  It may be towed at speeds up to 20 mph over improved roads or surfaces; 10 MPH  over rough  terrain.  The  unit is air transportable.  It has been designed to withstand the gravitational forces which might be encountered in normal flight.  The stand weight is 3060 pounds (wet). To familiarize using personnel with the equipment characteristics and physical makeup, a table of equipment data is pre- sented in Table 1-1 and some of the major components are identified in Figure 1-2. 1-10.    Descriptive  Details.    The  stand  operating  components,  including  the  control  panel,  are  enclosed  in  a  steel, weather resistant cabinet.  The cabinet is mounted on the four wheel trailer.  A hand operated mechanical parking brake on the rear wheels holds the test stand stationary while in operation or when parked.  The  major components and  sys- tems  of the test stand are:  trailer and running gear, cabinet, electric motor, high pressure hydraulic pump, hydraulic res- ervoir, hydraulic filters, instruments and controls, and the electrical system. 1-11.    Trailer and Running Gear Assembly.  The trailer frame is welded steel construction. The trailer rolls easily on four steel wheels equipped with 6.00/6.90-9,6 ply tires.  Transverse leaf springs and radius rods attached to the front and rear axles  cushion  the  stand  against  road  shock  and  rough  terrain,  protecting  the  components  of  the  test  stand.    A  hinged towbar permits ease of positioning of the test stand and towing.  The towbar can be latched in the upright position.  Front wheel steering is the conventional type with steering knuckles, tie rods, and king pins.  A hand lever (Figure 1-1) sets the rear wheel brakes, holding the test stand stationary when not being moved.  Tiedown rings (Figure 1-1) at each corner of the trailer frame permit tiedown of the test stand for storage or shipment. 1-12.    Housing.  Two hinged doors on each side and one on the rear of the cabinet permit access to all internal compo- nents.  A two hinged cover protects the controls when the test stand is not in use.  By releasing two catches on each side, front and rear, the entire housing can be lifted off the chassis.  A hinged access panel on top affords access to the hy- draulic reservoir fill cap. 1-2

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