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TM 5-4210-233-14&P-1 5-66.  APU GENERATOR-Continued WARNING Be careful when working on or with electrical equipment. Do not be misled by the term "low voltage".  Voltages as low as 50 volts may cause death. (18)  With the end cover and band removed to allow access to the rig, start the unit. (19)  Apply full rated load. (20)  Allow    unit    to    reach    full    operating temperature. (21)  Inspect  brushes;  they  must  be  seated across the brush face if we are to have an accurate setting. (22)  Connect   a   voltmeter   across   the   dc terminals. (23)  Loosen  the  brush  rig  mounting  screws and  rotate  the  rig  to  get  the  highest voltage with full load. (24) Rotate the rig in one direction until the voltmeter  reading  starts  to  decrease. Mark this point. (25)  Repeat Step 20 in the other direction.  Half the distance between the two marked points is the neutral position. (26)  Shutdown unit. f. Adjustment. (1)   The anti-flicker breaker points are located on   the   left   rear   corner   of   the   engine crankcase.    The  camshaft  opens  these points  on  every  power  stroke  to  add  a resistor  in  series  with  the  generator  field windings  (2).  To  adjust  the  points,  crank the   engine   until   the   points   are   at   full separation.  Adjust the stationary contact to .025 in. (.64 mm) gap.  Retighten and check  the  gap.    When  breaker  plunger guide and O-ring are removed, dip O-ring in oil before reinstalling.  Tighten guide to 25 to 28 ft Ibs (34 to 38 N·m). (2)   The  adjustable  flicker  resistor  is  located on  the  right  side  of  the  control  box.  If flicker   becomes   excessive,   adjust   the resistor    by    moving    its    slider.    Adjust resistor    for    minimum    flicker    with    the average load on the plant. g. Follow-on Maintenance. (1) Install APU (see para 4-207). 5-369

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