ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
NOTE
Mark polarity of diodes to ensure correct positioning during installation.
f. Remove nut (7), Iockwasher (8), and diode (6) from rotating rectifier through access hole in end bell.
4.25.2 Testing.
a. Shut down generator set. Allow generator to cool to ambient temperature.
b. Open battery access door and disconnect negative battery cable.
c. Remove generator set housing rear panel, paragraph 2.18.1.
d. Remove generator end bell plates and screens, paragraph 4.26.1, step d.
N O TE
It will be necessary to bar (turn) engine in order to position a specific
area of the rotating rectifier at one of the end bell access holes.
e. Remove nuts (1, FIGURE 4-13) and Iockwashers (2) from rotating rectifier terminals.
f. Tag and remove main rotor and diode leads from rotating rectifier terminals.
g. Tag exciter rotor leads and remove bolts (3), washers (4), and exciter rotor leads from rectifier mounting plate as-
semblies.
h. Set multimeter for ohms and connect positive lead to one side and negative lead to other side of diode. Repeat
procedure for each diode. Record multimeter reading for each diode.
i. Repeat step h, except with multimeter leads reversed.
j. Resistance (ohms) readings should be low in one direction and high in reversed direction. If any reading is high
or low in both directions, diode is defective and must be replaced.
k. Install diode and main rotor leads to rotating rectifier terminals with Iockwashers (2) and nuts (1). Remove tags.
l. Install exciter rotor leads to rectifier mounting plate assemblies with washers (4) and bolts (3). Remove tags.
m. Install generator end bell plates and screens, paragraph 4.26.2, step e.
n. Install generator set housing rear panel, paragraph 2.18.4.
o. Connect negative battery cable and close battery access door.
4.25.3 Installation.
a. Run bead of thermo compound (Item 8, Appendix C) around base of diode (6, FIGURE 4-13) prior to installing.
Do not coat threads.
4-46
