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 TM 55-1905-223-24-3
(2) Remove the non-drive end covers (3, Figure 3-3) for access to the rectifier assembly (2)
(3) Disconnect the terminal leads on positive semiconductors (3, Figure 3-6) and/or negative
semiconductors (5) as appropriate.
(4) Remove faulty semiconductors.
b. Replacement of semiconductors.
CAUTION
Heat sink compound must not be applied to the semiconductor
stud threads.
NOTE
All semiconductors in the rectifier assembly must be from the
same manufacturer.
(1) Apply a small amount of silicone heat sink compound to the underside of each semiconductor.
Ensure no compound gets on the threads.
(2) Install the new semiconductor (3, 5, Figure 3-6) and tighten to 36-42 in-lb (4-4.8 N-m) torque.
Connect the terminal leads and remove tags.
(3) Replace the non-drive end covers (3, Figure 3-3).
REMOVAL
a. Turn all starting circuits to the generator set OFF. Close start air valves on air start engine.
b. Remove the screws (1, Figure 3-7) and remove the terminal box cover (2).
CAUTION
It is extremely important to ensure that all wiring and cables are
tagged with locations recorded as they are removed from the
terminal block (3, Figure 3-7).
c.
Tag and disconnect all external cables attached to the block (3).
d. Remove the disconnect cables and their conduits from the generator terminal box. Ensure that you
record the location where each cable and conduit is removed from the terminal box. Each cable must
be returned to the same location on the new generator assembly when it is installed.
e. Tag and disconnect all external control wiring coming to the voltage regulator (4).
3-24
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