Hobart 60CU24, Operation And Maintenance Manual With Illustrated Parts List, Page: 130 / 234

OM-2098C / Operation and Maintenance Manual
60CU24 / Series 500060C / 400 Hz. Generator Set
April 01, 2005 Chapter 3-1
Page 6
CAUTION
Leads may be damaged if armature is turned too far in either direction.
a Place a block bar (pry bar) into the generator fan assembly to keep the generator armature
from rotating.
WARNING
To prevent personal injury, keep fingers and hands clear of generator assembly until
the armature is block into place to prevent rotation.
b Attempt to loosen exciter armature on shaft by rotating it slightly back and forth. If armature
cannot be loosened by hand, use two 3/8 – 16 X 5-inch hex-head bolts as shown in Figure 4
to force the exciter armature off the shaft. Turn each of the two screws a few turns at a time
into the threaded holes of the diode mounting plate until the exciter armature is sufficiently
loosened from the shaft to be removed from it by hand. Remove it slowly from the shaft and
at the same time observe the following
CAUTION.
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) Installation Exciter Armature
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.
b) Exciter Armature Installation
(1) If the exciter armature-to-generator shaft fit is such that the exciter armature may be pushed on
by hand, push it on very slowly while another mechanic carefully watches and pulls field leads
through hole in the exciter armature diode mounting plate. Continue installation until the diode
mounting plate contacts the end of the generator shaft. If the exciter armature cannot be pushed
on by hand, use a ½ - 13 X 5-inch hex-head bolt and ½ - 13 nut as shown in Figure 5 to pull the
exciter armature onto the generator shaft. Put the exciter armature on slowly and at the same
time pull field leads through the hole (Figure 2) in the diode mounting plate. Screw the nut onto
the bolt until it is near the head of the bolt. Insert the bolt through the hole in the center of the
diode mounting plate as far as it will go, and screw it into the end of the armature shaft. Screw the
nut up against the diode mounting plate. Continue turning the nut until the diode mounting plate