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All fasteners should be properly torqued.
(See section 12). Torque wrenches ranging
from 25 in-lb. through 200 ft-lb. should be
available.
Electrical test equipment should include a
voltmeter or multimeter (VOM), clamp on
ammeter, accurate frequency meter or
tachometer, and a megohmmeter. See
section Generator Testing for more informa-
tion.
SPECIAL TOOLS
In addition to the standard tools mentioned
above, the following special tools would
facilitate removal and installation of large
and/or special parts. These tools can be
obtained from the Marathon Electric parts
department.
Exciter stator lifting fixture (Figure 10-1).
Figure 10-1
In cases where the exciter stator is to be
serviced without removing the generator
conduit box this fixture can be used with
overhead rigging to remove and reinstall the
exciter stator.
Exciter rotor puller bolt (Figure 10-2). The
exciter rotor has a built in pulling system.
With the use of this bolt, the rotor can be
easily removed from the shaft without
damage to the winding.
Figure 10-2
The PMG rotor is installed to the generator
shaft with a snap ring.
The nominal shaft diameter is 2-3/4 inches
and the ring must be spread approximately
3/4 inches for removal. To install the snap
ring, use a piece of pipe with a 2-3/4 inch
I.D. (Figure 10-4). Push the PMG rotor and
snap ring onto the shaft until the ring snaps
into the groove.
Figure 10-4
Rotor lifting fixture (Figure 10-5). The main
generator rotor is heavy (approximately 1/2
the weight of the generator) and difficult to
handle. The proper fixture should be used
whenever removing or installing the main
65
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