TM 10-3930-671-24 ASSEMBLE   STATOR   TO   REAR   HOUSING   -   Place stator  in  rear  housing,  with  leads  extended  toward  heat sink.  Assemble diode and stator leads to diode terminal screws.  When properly assembled, each screw will hold a  black  lead  from  a  negative  diode,  a  red  lead  from  a positive  diode  and  a  lead  from  the  stator.    The  terminal screw  nearest  to  the  stator  terminal,  will  also  hold  the stator tap lead wire. Install  washers  and  nuts,  secure.    Arrange  all  leads  to prevent accidental contact with surfaces or through bolts. Align stator slots with through bolt holes. ASSEMBLE   FRONT   AND   REAR   HOUSING   -   Place front housing, with rotor assembled, in a vise, drive  end down.      Place   sealing   gasket   over   top   edge   of-front housing.    Place  rear  housing  and  heat  sink  assembly over   top   end   of   rotor,   align   bearing   cavity   and   press halves together. Position  gasket  to  align  with  through  bolts.    Install  bolts and tighten securely.  Spin rotor by hand to insure proper assembly. INSTALL   BRUSH   ASSEMBLY   AND   COVER  -   Place insulator  over  brush  assembly,  slide  into  brush  cavity, position with alignment pins.  Secure insulator and brush assembly  to  rear  housing  with  screws.    Connect  brush lead to cover.  Place gasket in recess area, install brush cover, secure with screws. INSTALL PULLEY AND FAN - Place pulley soacer over rotor  shaft,  install  Woodruff  key  in  slot.    Place  fan  and pulley  on  shaft  and  install  lockwasher  and  nut.    Secure nut at 35 to 50 ft.  lbs.  Spin rotor by hand to insure fan does  not  rub  housing.    This  completes  the  assembly  of the alternator. ALTERNATOR OPERATING TEST (LESS REGULATOR) - Mount alternator in test fixture capable of providing 3000 to   4000   alternator   RPM,   in   either   direction.      Connect circuit leads as shown in (Figure No.  65). Turn   drive   motor   on,   adjust   to   obtain   3000   to   4000 alternator    rotor    speed.        Reduce    resistance    of    field rheostat to zero.  Alternator should commence to charge and reach rated output in amperes, within the recommended   speed   range.      Obtaining   rated   output, alternator is suitable for installation. Do not operate alternator for more than a few minutes in this manner, due to the lack of voltage control. FIGURE NO.  65. When  reinstalling  alternator  on  engine,  accurately  align alternator and engine drive pulley (Figure No.  66). FIGURE NO.  66. To    tighten    belt,    press    against    front    housing,    near alternator  fan.    Do  not  apply  pressure  to  alternator  rear housing. Set belt tension per manufacturer’s recommended   specifications   and   tighten   all   bolts.      If manufacturer’s  specifications  are  not   readily   available, set belt tension tight enough so that the belt on alternator fan    pulley    will    not    slip    when    attempting    to    rotate alternator fan by hand. F-296