TM 5-6115-275-14 NAVFAC P-8-615-14 TO 35C2-3-452-1 CHAPTER 8 MAINTENANCE OF GENERATOR ASSEMBLY AND FRAME ASSEMBLY Section I.   GENERATOR ASSEMBLY 8-1. General (Model MEP-018A) a. General.  The generator is attached to the engine by a coupling on the rotor shaft which connects  to  the  drive  hub  mounted on the engine flywheel. Disconnection   of   the   coupling   from the  drive  hub  permits  removal  of  the generator as a unit. CAUTION se the setscrew for securing the coupling.   This  setscrew  is used to prevent end play of the key only. NOTE sembling  the  split  flange  coupling  to  generator  rotor  shaft, back   off   the   setscrew   to   clear   the   key, secure the flange by tightening the machine screw. b. On-Equipment Testing. NOTE stance    measurements,    together    with    their    tolerances contained  herein,  should  be  used  only  as  a general  guide.    Take  into  consideration  the accuracy  of  the  instrument  used,  test  lead resistance,  and  ambient  temperature  at  the time of the test. If more precise measurements are required, use an instrument  such  as  a  Kelvin  or  Wheatstone bridge of comparative measurements between   the   suspected   component   and   a like item that is known to be good. (1) Disconnect  the  plug  connector  from the rear of the control box. (2) Use  a  multimeter  set  on  RX  1  scale and test between pins 3 and 6, 8 and 12,  7  and  10,  1  and  4,  2  and  5,  11 and 13, and 9 and 14.  If continuity is not  indicated  in  all  tests  the  stator  is defective and should be removed for further testing or replacement. c. Removal.  To remove the generator and engine as an assembly, refer to paragraph 6-2. To remove generator assembly, proceed with step 1,. (1) Remove battery.   Refer to paragraph 4-28. (2) Remove    control    cabinet    assembly, refer to paragraph 6-1. (3) Remove 4 nuts and lockwashers and remove upper frame from skid. (4) Remove   ventilating   screen   and   unit lifting eye. (5) Remove   lower   support   bracket   and shrouds. (6) Remove    two    remaining    bolts    that secure    generator    housing    to    the engine. (7) Remove two drive coupling bolts. (8) Remove     two     generator     mounting bolts. (9) Attach a lifting device to the generator lifting eyes located inside the tool box and remove generator from engine. d. Disassembly. (1) Remove  two  bolts  and  nuts  holding drive coupling assembly together and separate the two coupling halves. (2) Remove  the  setscrew  (1,  Figure  8-1) from    the    drive    coupling    assembly support,   loosen   alien   bolt   on   drive coupling  assembly  support,  and  slip support (2) off the rotor shaft (33). (3) Remove     the     coupling     and     shaft machine key (6). (4) Loosen  and  remove  the  nut  (3)  and the  key  washer  (4)  securing  the  fan to   the   generator   housing   and   rotor assembly and remove the fan (5). Change 8  8-1