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CHAPTER 3 MAINTENANCE INSTRUCTIONS, AVUM, AVIM
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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SECTION III.  PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
TM 1-4920-446-13 & P d.  Open  access  doors:  Inspect the plumbing  installation for damaged  tube assemblies or fittings.  Check that all fittings are securely connected. e.  Carefully inspect the electrical wiring for broken wires or frayed insulation.  Check that all electrical connections are secure.  Be sure all ground circuits within the unit are intact and that equipment is properly grounded before energiz- ing. f.  Inspect the motor installation for evidence of shipping damage.  Check that the motor mounting bolts are securely tightened. g.    Inspect  oil  reservoir  for  evidence  of  physical  damage  in  shipment.    Check  that  the  gauge  sensor  is  securely mounted in the oil reservoir.  Check  that  the electrical wiring to the sensing unit is not damaged.  Check the fluid system carefully for evidence of leakage. h.  Checktires for proper inflation pressure.  Normal tire pressure is 60 psi with tires cold.  Inspect tire treads and casings for cuts or abrasions and remove any imbedded objects from treads. i.  Check  the tow bar and steering assemblies.  Make  certain that tie rods have not been bent or damaged and that the steering apparatus swings freely. j.  Check  hand  brake  assembly  by  setting  the hand  brake  and  testing rear wheels for braking action. k.  Inspect the test stand trailer and cabinet for any damage, making certain that all bolts and screws are secured. Check doors and door latches for proper closing and locking. l.  Open electric motor access door and remove external electrical cable.  Lay out cable and inspect condition of ca- ble and end fitting.  Any damage to the cable end fitting or evidence of broken wires in the cable is cause for replacement of the cable.  Ensure cable ends are securely connected to terminal boards 1 and 2 (TB1, TB2) in the electrical assembly enclosure.  A new test stand is factory wired for 220 volt, 3 phase, 60 hertz operation.   Refer to Figure 1-5 to verify test stand is wired for 220 volt operation.  or to convert to 440 volt operation. 3-8.  Servicing Hydraulic System.  Service the hydraulic system for use as follows: a.  If  the  hydraulic fluid reservoir (Figure  1-2) has been filled with a preservative fluid for shipment, drain the res- ervoir by opening the reservoir drain plug in the bottom of the reservoir.  Make certain drain plug is closed after reservoir has been completely drained. b.  Drain the preservative fluid (if necessary) from the hydraulic system at the low pressure filter drain (Figure 1-2). When completely drained, replace drain plug. c.  If necessary, drain the preservative fluid from the high pressure pump by removing the drain plug located in the corner of the pump case.  When completely drained, replace plug.  Refill pump case with hydraulic fluid, MIL-H-83282. 3-2

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