(14)  Turn  the  control  unit  frequency  adjust  screw clockwise until the proper engine speed is obtained. Several  turns  may  be  required.  The  generator  set frequency  adjust  pot  should  now  have  sufficient  adjust- ment  travel  to  cause  the  generator  set  frequency  meter to indicate beyond both of its extreme limits (388-412 Hz). (15)  If  the  engine  is  unstable  as  indicated  by  con- tinuous  movement  of  the  actuator  lever,  turn  the  control unit  gain  control  counterclockwise  until  stability  is  ob- tained  as  indicated  by  a  stationary  actuator  lever.  Re- adjust  the  control  unit  frequency  adjust  screw  to  the proper engine speed. (16)  Turn  the  control  unit  gain  control  clockwise  un- til  the  engine  becomes  just  unstable;  back  the  gain  con- trol  counterclockwise  until  the  engine  is  again  stable. (17)  Turn  the  control  unit  stability  control clockwise  until  the  engine  becomes  just  unstable;  back the  stability  control  counterclockwise  until  the  engine  is again  stable. NOTE The governor is now set to a nominally good operating   point. (18)  Adjust  control  unit  gain,  stability  and  frequen- cy  under  various  load  conditions  and  load  changes  to obtain  the  desired  governing  characteristics. (19)  When  the  electric  governor  system  is  properly adjusted,  the  locknuts  on  the  control  unit  gain  and stability  controls  should  be  tightened. 7-11.  ACTUATOR  UNIT. a.   Removal. (1)  Disconnect  electrical  connector  P22,  (1,  figure 7-16). (2)  Disconnect  the  actuator  lever  from  the  actuator linkage rod by removing the hex head cap screw (2), flat- washer (3), and the self-locking nut (4). NOTE It  may  be  necessary  to  remove  the  actuator bracket  to  gain  access  to  the  hardware  securing the  actuator  to  the  actuator  bracket.  If  this  is not  necessary,  proceed  to  paragraph  (3).  If removal is required, then proceed as follows: (a)  Loosen  the  drive  belt  of  the  engine  alternator. (b) Remove the two hex head screws (5) and lock washers  (6)  securing  the  actuator  bracket,  through spacers  (7),  to  the  engine  through  the  alternator  mount- ing  bracket. (3)  Disconnect  the  actuator  from  the  actuator bracket by removing two hex head screws (8), flat- washers (9), lock washers (10) and nuts (11). Remove  the  actuator. b.   Testing. (1)  Using  an  ohmmeter,  check  for  continuity  be- tween pins A and B and pins C and D. Replace actuator if there is no continuity. (2)  Check  for  short  circuit  between  each  pin  on  the connector  and  the  housing.  Replace  actuator  if  any  pin  is shorted  to  case, c.   Installation. (1)  Position  the  actuator  lever  (12,  figure  4-30.3) roughly  horizontal  by  loosening  the  nut  on  the  splined shaft  end  of  the  actuator  lever,  rotating  the  lever  and tightening  the  nut. (2)  Align  the  actuator  with  the  two  holes  in  the actuator  bracket,  secure  the  actuator  to  the  actuator bracket with two ¾-inch long hex head screws (8), flat- washers (9), lock washers (10) and nuts (11). NOTE If  the  actuator  bracket  has  not  been  removed, proceed  with  paragraph  (3).  If  the  bracket  must be installed, proceed as follows: (a)  Insert  the  spacers  (7)  through  the  alternator mounting   bracket. (b)  Secure  the  actuator  bracket  to  the  engine  by inserting the two 1½-inch long hex head screws (5), lockwashers (6), into the appropriate holes in the ac- tuator  bracket,  through  the  spacers  (7)  and  into  the threaded  holes  in  the  engine;  tighten  the  two  screws. (c)  Adjust  the  drive  belt  of  the  engine  alternator to  the  required  tension  and  secure  the  alternator. (3)  Attach  the  actuator  lever  to  the  actuator linkage rod with the 1½-inch long hex head cap screw (2), two flatwashers (3) and the self-locking nut (4). (4)  Connect  electrical  connector  P22  (l). 7-12.   ELECTRIC   GOVERNOR   MAGNETIC   PICKUP. a.   Removal. (1)  Disconnect  electrical  connector  P23  (1,  figure 7-17). (2)  Loosen  locknut  (2)  and  unscrew  the  threaded magnetic pickup from the flywheel housing (3). Remove the  magnetic  pickup. b.   Testing. (1)  Using  an  ohmmeter,  test  for  continuity  between pins A and B on the connector. (2)  If  the  circuit  is  open  discard  the  magnetic pickup. c.   Installation. (1)  Rotate  the  engine  until  the  top  land  of  one  gear tooth is in line with the center of the threaded hole in the flywheel housing. (2)  Replace  the  magnetic  pickup  (3)  into  the  thread- ed hole in the flywheel housing until the tip contacts the top of the gear tooth. Back the magnetic pickup out one- half  to  three-quarter  turn  and  secure  with  the  locknut  (5) provided. (3)  Connect  electrical  connector  P23  (1), 7-22 Change 10