Exciter Armature Installation; Preparation For Exciter Armature Installation - Hobart 120CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
CAUTION
Pay close attention to field leads while pulling exciter armature from shaft. Make
CERTAIN that the leads stay in the 1/2" keyway. One mechanic should watch them
constantly while another operates the puller. Make certain that leads do not catch and
be sure that they slide smoothly through the hole (Figure 2). Straighten leads and
remove kinks as required to avoid damage to insulation.

4) Exciter Armature Installation.

a) Preparation for Exciter Armature Installation.
(1) Clean generator shaft and exciter armature bore. Remove all rust, corrosion, etc.
(2) Make CERTAIN that the leads are tucked into the 1/2" keyway, which is opposite from the 3/8"
keyway in the generator armature shaft.
(3) Route the revolving field leads (step 2 above) through exciter armature hole (Figure 2), which is
opposite the keyway.
(4) Align armature keyway with key in shaft and start armature on shaft.
October15, 2013
Figure 4 Exciter Armature Removal.
Chapter 3-1
Page 6