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OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
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 tightens the exciter armature on the generator armature shaft. You
may have such a puller in your equipment. 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 Paragraph e, (1)
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 two 3/8 - 16 X 5-inch fully-threaded
hex-head bolts. Instructions for doing this are provided in Paragraph e, (2).
1. Stud, 1/4-28 UNF 2A, Grade 5 or 8 ONLY
2. Adapter, 3/4" Round CR Steel
3. Nut, 1/2-13 Hex, Steel (3 required)
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.
November 27/1997
4. Rod, 1/2" Round, CR Steel
5. Hammer, 2" Round, CR Steel
6. Washer, Flat, 1/2" Steel
Sling-Hammer Puller
Figure 3
Chapter 3-1
Page 3
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