TM 5-6115-332-14 P-8-614-14 TO  35C2-3-424-1 Section II. MAINTENANCE  OF  THE  GENERATOR 7-11.  General The  generator  housing  is  mounted  directly  on  the flywheel housing (Model MEP-017A) or mounted on the  flywheel  housing  by  use  of  an  adapter  (Model MEP-022A).  The  rotor  is  mounted  on  a  flexible drive disk that, in turn, is mounted on the engine flywheel.  The  rotor  is  made  up  electrically  of  two sections, the alternator field and the brushless, ro- tating   exciter   section.   The   generator   housing houses both the generator (alternator) stator wind- ings and the dc exciter frame and field windings. 7-12.  On-Equipment  Testing a.  General.   On-equipment  electrical  test  pro- cedures  may  provide  a  basis  for  determining  the  ne- cessity  and  extent  of  generator  repair.  The  re- sistance  values  and  tolerances  contained  in  this paragraph should be used only as a general guide. Take  into  consideration  the  test  instrument  used, test lead resistance, and the ambient temperature at  the  time  of  the  test.  If  more  precise  mea- surements are required, use an instrument such as a Kelvin Balance or a Wheatstone Bridge and make comparative measurements between the suspected component and a like item that is known to be good. b. Stator. (1) Disconnect  the  plug  connector  (Pi)  at  the rear of the control box. (2) Use a multimeter that has been set on the RX1 scale and test for continuity between plug pins A and B, D and E, and C and F. If continuity is not indicated  (full  deflection)  on  any  of  the  tests,  re- move the plug at the generator and repeat the tests at the generator. If, again, continuity is not shown, the stator is defective and must be replaced. If con- tinuity is shown the cable is defective and must be replaced. c. Rotor. (1) Remove the blower cover and fan (para 6-2 or 6-3). (2) Use a multimeter that has been set on the RX1 scale and test between the rotor field windings terminal and the case of the rotor. If the resistance is not within five percent above or below the follow- ing  values,  the  rotor  must  be  removed  for  further testing (TM 5-764): Model MEP-017A (60 Hertz) . . . . . . . . . . . 8.8 ohms Model MEP-022A (400 Hertz) . . . . . . . . . 0.615 ohms d. Exciter Field Windings. (1) Disconnect  the  plug  connector  (Pi)  at  the rear of the control box. (2) Use a multimeter that has been set on the RX1 scale and test for continuity between plug pins G and H. If the resistance is not within five percent above  or  below  54.4  ohms,  the  windings  are  de- fective and must be replaced. 7-13.   Main   Generator   Stator   and Housing Assembly a.   Removal.   For   generator   removal   in- structions, refer to paragraphs 6-2 and 6-3. NOTE It is also possible to remove the engine and gener- ator as a unit. If this is to be accomplished, refer to paragraph  6-4  and  follow  the  instructions  on  re- moval of the engine from the skid. b.  Disassembly. (1) Model MEP-017A. (a) Tag and disconnect all leads. (b)  Remove  screws  (1,  fig.  7-8)  and  lock- washers (2) and remove the  wire clips (3) from the exciter frame (24). (c) Remove screws (4) and lockwashers (5) and  remove  the  wiring  harness  (6)  from  the  housing (25) . (d) Disassemble the wiring harness (6) by removing connector (7) at clamp (8) and adapter (9) at clamp (10) from the leads and sleeving (11). (e) Remove the air inlet grille (12) from the housing (25). (f) Remove the lifting eyebolt (13) and nut (14) from the housing (25). (g) Remove capscrew (15) and lockwashers (16) and remove the stator (17). (h)  Remove   capscrews   (18)   and   lock- washers (19) and remove the exciter frame assem- bly (24) from the housing (25). (i) Remove  screws  (20)  and  lockwashers (21)  and  remove  the  exciter  pole  (22)  and  exciter coil (23) from the exciter frame assembly (24). 7-12