ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
e. Tag and disconnect exciter rotor leads (3 places) from rotating rectifier by removing bolts (3, FIGURE 4-13) and
f. Connect resistance bridge between two exciter rotor leads and note resistance reading. Continue this procedure
until readings are noted for each combination of leads (ie: 1 and 2, 1 and 3, and 2 and 3).
g. Resistance readings should be as shown in TABLE 4-3 for each combination of leads. Readings other than in
TABLE 4-3, indicates open or shorted windings and exciter rotor must be replaced.
h. Set multimeter for ohms and connect between each exciter rotor lead and exciter stator mounting bolt in turn.
i. Multimeter reading of less than infinity indicates defective ground insulation and exciter rotor must be replaced.
j. Connect exciter rotor leads to rotating rectifier with Iockwashers (4, FIGURE 4-13) and bolts (3). Remove tags.
k. Install end bell screens and plates, paragraph 4.26.2, step e.
l. Install generator set housing rear panel, paragraph 2.18.4.
m. Connect negative battery cable and close battery access door.
a. Install retaining ring (19, FIGURE 4-15) and key (20) on main rotor shaft (9).
b. Press exciter rotor(18) onto shaft (9), over key (20) and against retaining ring (19).
Use protective gloves when handling heated rectifier hub (14) to pre-
vent personal injury.
c. Heat rectifier hub (14) until it slides into place on shaft (9) with slight pressure.
d. Once rectifier hub (14) has cooled, pull two main rotor leads through holes in exciter rotor (1 8).
e. Install rotating rectifier, paragraph 4.27.2.
f. Install main bearing and generator end bell, paragraph 4.26.2.
g. Install generator set housing rear panel, paragraph 2.18.4.
h. Connect negative battery cable and close battery access door.
4.30 GENERATOR MAIN ROTOR (MEP-814A).
a. Shut down generator set
b. Remove generator assembly from generator set, paragraph 4.16.1.
c. Remove bolts (21 and 23, FIGURE 4-15), washers (22) and (24), spacers (25), and drive disc (26) from drive hub
N O T E
Mark Iocation of two spacers (25), washers (24), and bolts (23) to en-
sure correct positioning during installation procedures.
d. Attach a suitable rotor lifting fixture to drive hub (27) and overhead hoist, refer to FIGURE 4-12
e. Remove generator end bell, paragraph 4.26.1.
C A U T I O N
Special care should be taken when removing main rotor, winding dam-
age could result if rotor is allowed to hit main stator.