TM 5-6115-593-12 TO 35C2-3-463-1 with   guards   (21   and   37)   onto front panel with mounting hardware. (d) Attach   wires   to   switches   S22 and     S20     (20     and     36)     and remove tags. 4-33.      POTENTIOMETER   R104   REACTIVE   LOAD COMPENSATION CONTROL (47, figure 4-18). a.   Test (1)   Tag   and   unsolder   leads   from   R104 (47, figure 4-18). (2)   Connect  an  ohmmeter  (Rx1  scale  to each of the terminals on the potentiometer. (3)   Turn  potentiometer  slowly  throughout its range (0 to 1 ohm). As potentiometer is rotated, the ohmmeter reading should move at the same   rate   as   the   rotating   shaft.      If ohmmeter  pointer  does  not  move,  or moves erratically the potentiometer is defective and should be replaced. b.   Replacement. Replace defective potentiometer (47) as follows: (1)   Removal.      Tag   leads   and   remove mounting hardware. (2)   Installation.      Install   potentiometer   in panel with mounting hardware. Solder wires and remove tags. 4-34.  POTENTIOMETER R103 (54, FIGURE 4-17). a.   Test.  This potentiometer is located at the top of    the    governor    controller    assembly    (56, figure 4-17). (1)   Tag   and   unsolder   leads   from   R103 (54). (2)   Connect  an  ohmmeter  to  each  of  the terminals on the potentiometer. (3)   Turn  potentiometer  slowly  throughout its  range  (0  to  500  ohms).    As  the potentiometer    is    rotated,    the    ohm- meter   reading   should   move   at   the same rate as the rotating shaft.  If the ohmmeter  pointer  does  not  move,  or moves erratically, the potentiometer is defective and should be replaced. b.   Replacement. Replace defective potentiometer (54) as follows: (1) Removal.      Tag   and   remove   wires. Remove    shaftlock    (55)    to    remove potentiometer. (2) Installation.  Install potentiometer (54) and   secure   with   shaftlock.      Solder wires and remove tags. 4-35.      MOTOR-OPERATED   POTENTIOMETERS   B4 (2, figure 4-19) and B5 (4, figure 4-19).  Inspect motor- operated  potentiometers  B4  (2,  figure  4-19)  and  B5  (4, figure    4-19)    for    loose    connections,    broken    leads, cracking, or loose mounting. 4-36.  DC AMP SHUNT (6, figure 4-19). a.   Test. (1) Connect   a   0   to   30   amp   DC   power supply to the terminals of the DC amp shunt (6, figure 4-19). (2) Connect a 0 to 0.10 volt DC meter to the terminals of the DC amp shunt. (3) Increase    power    to    30    amps;    the voltmeter  should  read  0.05  volts  +10 percent. (4) If   correct   reading   is   not   obtained, refer to next higher level of maintenance. 4-37.   RELAYS.    Inspect  K20,  K1  and  K50  relays  (33, figure  4-17  and  7  and  18,  figure  4-19)  respectively  for loose mounting, loose connections, cracking, or damaged castings. 4-38.  HARNESS ASSEMBLY. WARNING Set MAINTENANCE LOCKOUT switch to LOCKOUT.      Disconnect   negative   cable from  batteries.    Remove  external  power by  opening  CB101  (120V  RECEPTACLE BREAKER).  Load terminals of generator set   circuit   breaker   (CB2)   may   still   be energized with bus voltage. 4-57