OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015
Chapter 3-1
Page 2
1. Exciter Core Flange
2. Exciter Core Lamination
3. Diode Mounting Plate
4. Silicon Diode
Figure 3-1-2 Exciter Armature
The exciter armature is mounted on the rear portion of the main generator armature shaft, which extends
rearward beyond the rear generator bearing into the exciter housing (See Figure 3-1-1). Because of its
location on the shaft, the exciter armature must be removed for rear main bearing replacement. The
exciter armature has two M10-1.5 tapped holes in its diode mounting plate to accommodate pulling it off
the shaft.
Since the removal and installation of exciter armatures can be rather complicated, this manual has been
prepared to assist mechanics in the operation. It may be necessary to remove the exciter armature
several times for bearing replacement during the life of a generator set.
2) Exciter Armature
The exciter armature used in this generator set consists of a revolving winding assembly on a laminated
core, a rectifier assembly (diode mounting plate with diodes), and a mounting flange. The flange, core,
and diode mounting plate are bolted together to make the complete exciter armature.
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