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 TM 55-1905-223-24-4
(4)
A good diode will give a high resistance (infinity) in the reverse direction, and a low resistance (full
deflection) in the forward direction.
(5)
A faulty diode will give a high resistance reading in both forward and reverse directions, or a low resistance
reading in both directions.
(6)
Use the multimeter and check the varistor (surge suppresser). The varistor is connected across the two
rectifier plates to prevent reverse voltages from damaging the diodes.
(7)
A good varistor will show a high resistance reading in both directions.
(8)
A defective varistor will show a low resistance reading in both directions.
NOTE
Normally, a defective varistor will show signs of burning and can be
detected by visible inspection.
9)
Replace defective diodes and varistor as necessary (refer to DISASSEMBLY and ASSEMBLY steps of this
procedure).
ASSEMBLY
a
Install varistor (18, FIGURE 3-27) and secure with capscrews (17).
b. Install forward rectifier (15) and forward polarity diode (16); torque nut and lockwasher (19) to 42 in-lb. (4.74 N-m).
c.
Install reverse polarity diode (13) and reverse rectifier (14); torque nut and lockwasher (19) to 42 in-lb. (4.74
N-m).
d. Install rotor assembly (30) and fan (29) into stator assembly (11).
e. Install adapter (28) to pad eye (20), secure with capscrew (22) and lockwasher (21).
f.
Install coupling disk (27) and secure with capscrews (24) and lockwashers (23).
g. Install pressure plate (25) and secure with machine screws (26).
h. Install voltage regulator (10).
i.
Install terminal link (8) on main terminal panel (9).
j.
Install machine key (12) in end of shaft (31).
k. Install rotor (2) and stator (3) in exciter stator (1). Secure to exciter stator with clamp (4), lockwasher (5),
capscrews (6), and bolt (7).
3-35
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