5
Fig.
5-21
Fig.
5-
22
Fig.
5-23
Fig.
5-2
4
5 :
7
0.5
-0
.S
mm
(0.020- 0.031
in)
Drive the
pinion
stop collar toward the armature,
and remove the stop ring. Then, slide the stop collar
and over-running clutch
off
the armature shaft.
5-C-5
. Inspec
ti
ng
Starting
Motor
a.
Checking armature
Ground test:
Touch one prod
of
an
ohmmeter to each segment in
order and the other prod
to
the core or shaft.
An
infinite reading should be obtained for each segment.
If
the meter reading
is
not infinite, the armature must
be replaced.
Short-circuit
test:
Place
the armature against the core
of
the growler
tester, and hold a steel strip
on
the armature. Then,
rotate the armature slowly
by
hand. If the armature
coil
is
shorted, t
he
steel strip will become magnetized
and vibrate. Replace
the
armature
if
a short
is
found.
b.
Checking
commutator
If
the commutator
is
dirty, discolored or worn, clean
it
with emery paper and wash with clean solvent.
After cleaning, undercut the mica between the
seg-
ments
to
the depth
of
0.5 - 0.8
mm
(0.
020
- 0.031
in),
as shown in Fig.
5-2
4.
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