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(305)
ELECTRICAL
SYSTEMS
GENERATING SYSTEM
10-29
GASKET
BEARING
PLATE
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QQ;@
KEY
L
ARMATUREJ
Figure 10-19-Generator Disasse;"bled
to the cont ou r of the commutator in a few sec-
onds. Blow all dust out of generator after
the brushes are seated.
b.
Disassembly,
Cleaning and Insp
ection
When it is necessary to disassemble generator
f
or
any reason, make a complete clean up and
test to make sure all parts are in
satisfactory
condition. See figure 10-19 for identification of
parts.
1. Remove
commutator cover band, discon-
nect leads at
brushes
and remove brushes.
2. Unscrew through bolts and
remove
the
commutator end frame and
field
frame.
3. Hold armature in vise equipped with soft
jaws, and avoid excessive tightening of
vise.
Remove pulley nut, lock washer,
pulley,
fan
,
key,
collar, and drive end frame from armatur e
shaft. Remov e
spacer washer.
4.
Remo ve
bearing
retainer
plate,
gasket,
bearing, plate and
f
elt washer
from drive end
frame.
5.
Thoroughly clea n and inspect the ball
bearing as
described under
Beari ng Service
(par.
1-1
3
&
1-14),
a
nd
if
satisfa ctory for
us
e,
pack it
with
hi
gh
melting point ball
bearing
g-rease. Replace
wo
rn or
rough
bearing.
6. Remove
dust cap
f
r om comm ut ator end
frame and clean out oil
reservoir. Mak e sure
that vent hole in dust cap is open. Install dust
cap with new
gasket.
7. Clean all other parts by wiping with
clean cloths. The armature and field coils must
not be Cleaned in any degreasing compound
since this might damage insulation so that a
short or ground would subsequently
develop.
8.
If
field coils
a
r e to be removed from
frame, a pole shoe spreader (KMO 579) and
pole shoe screwdriver should be used to avoid
distortion of frame. Se
e
figure 10-65
.
9.
Carefully inspect all parts for wear or
damage and make
necessary
repairs, or replace
unservice~ble
parts.
Any soldering must be
done with rosin flux; never use acid flux on
electrical connections.
If
brush springs are dis-
torted or show evidence of overheating, replace
them.
c. Test ing and Re pa ir ing Armature
Before making an
y
r
epairs
t
o t
he armat u r e,
test it fo
r
open, shorted or grounded
circuit s.
Open circuits in armature are
usually obvio us
since the open
circuited commu tator bars
a
re
usually burn ed as a
result
of a
rci ng
as they
pa
ss
und er
the
br us hes.
If
generator
has ove
r heated
a
nd thrown solder, t
he
open circ uit will
be
at
connect ion s t
o com
mutator
riser
bars.
Repai
r
ca
n
be
effected
by
resoldering
lead s to r
iser
bars,
using rosin flux.
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