OM-2098C / Operation and Maintenance Manual
60CU24 / Series 500060C / 400 Hz. Generator Set
April 01, 2005 Chapter 3-1
Page 3
The exciter armature is mounted on the main generator armature shaft with a 3/8-inch square machine
key and is held in place by a ½ - 13 hex head cap screw in the center of the diode mounting plate.
3) Exciter Armature Replacement
a) General
As stated earlier, exciter armature removal is often required for rear bearing replacement rather than
for replacement of the exciter armature itself. Other reasons for exciter armature removal are
generator armature replacement, general overhaul, etc.
b) Tools needed for Exciter Armature Removal and Installation
In addition to the standard mechanic’s hand tools such as wrenches, etc., you will need only the
following items for removing the exciter armature:
• A small, lightweight, sling-hammer puller
• Two 3/8 – 16 X 5-inch fully-threaded hex-head bolts
A small, lightweight, sling-hammer puller is shown in Figure 3. This tool is necessary for removing
the threaded machine key, which keeps the exciter armature from spinning on the generator armature
shaft. You may have such a puller in your equipment inventory. If not, Figure 3 also illustrates
components and dimensions for fabricating such a tool. Sling-hammer pullers are also commercially
available. Instructions for using tool are provided in this manual.
Once the threaded machine key is removed, No other special tools are required for removing the
exciter from the generator shaft. This can be done using the two 3/8 – 16 X 5-inch fully-threaded hex-
head bolts. Instructions for doing this are provided in this manual.
c) Conditions for Exciter Removal
The mechanics performing the work must decide upon the best and most convenient method of
removing the exciter armature. If the exciter armature is being replaced, then the work may be
performed without removing the generator from the machine. In a great majority of cases, exciter
removal will be for the replacement of the rear bearing. This operation can also be accomplished
without removing the generator. Replacement of the front bearing requires removal of the generator
from the unit.
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