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d. Preparation for Exciter Armature Removal
(1)
Remove louvered exciter cover from end canopy.
(2)
Remove exciter housing cover as required. Remove the 1/2-13 cap screw which holds the
exciter armature on the generator shaft.
(3)
Refer to Figures 1 and 2. Disconnect the two rectifier-to-generator field leads. One lead with a
ring type terminal is attached to the rectifier mounting plate with a screw (“A”, Fig. 2) and the
other lead goes into a splice type connector with three other leads (“X”, Fig. 2) coming from the
exciter armature windings. Cut the leads at the connector for removal of the one field lead. Cut
as close as possible to the connection as to preserve lead length for reconnection later during
exciter armature installation.
(4)
EXERCISE CARE
to prevent damage to leads. Remove kinks in the two generator leads as
much as possible before starting removal operation.
e. Exciter Armature Removal
(1)
Removing the Threaded Key with Sling-Hammer Puller
Refer to Figure 4 for location of threaded machine key. Attachment of the assembled puller to
the key in one operation is not recommended because the weight and bulk of the assembly
make threading the 1/4 inch stud into the key rather clumsy. This could result in cross-threading
and damage to key and stud. It is safer and easier to attach as follows:
a.
Thread stud (1, Fig. 4) into adapter (2) until it bottoms, then thread this assembly (1) and (2)
into key until stud bottoms in key threads. Tighten securely.
b.
If hammer (5) and rod (4) are not already assembled, thread one nut (3) onto adapter end of
rod (4). Thread rod into adapter until it bottoms, then tighten nut securely against adapter.
Slide hammer (5) onto rod and install washer (6) and two nuts (3). Thread nuts onto rod until
both nuts are full threaded, then lock together.
Be very careful during removal process (slide-hammering) to avoid injury to
hands.
Exercise care to prevent breaking or damaging stud.
c.
Position hammer at adapter end of rod.
d.
Quickly move hammer to outer end of rod with a rapid, slinging motion.
HOLD
the hammer
through the entire motion. If hammer is allowed to slide free on the rod, the stud could be
DAMAGED
or
BROKEN.
e.
Repeat steps (c) and (d) as required to loosen key, then remove key and slide-hammer puller.
f.
After key is removed, apply penetrating oil in the armature and shaft keyways.
WARNING
CAUTION
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
Chapter 3-1
November 27/1997
Page 4
Содержание 90CU24
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