OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October15, 2013
Chapter 3-1
Page 1
Chapter 3 Overhaul/Major Repair.
Section 1.
Exciter Armature.
1) General.
This section provides information and instructions for removal and installation of the exciter armature
used on this generator set. Through design improvements, the exciter and rear main bearing can be
removed without removing the generator from the generator set. The name “exciter armature” refers to
the shaft-mounted, revolving, three-phase windings of the exciter.
1. Coupling Key (Not Shown)
2. Flex Coupling Assembly
3. Generator Housing & Stator Assembly
4. Armature Assembly
5. Exciter Housing & Coils Assembly
6. Exciter Cover
7. Exciter Armature Assembly (Not Shown)
8. Exciter Key (Not Shown)
9. Front Bearing (Located Inside Housing Shown)
10. Rear Bearing (Not Shown)
Figure 1 General Assembly.
Summary of Contents for 120CU20
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