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Page Title:
FIGURE 20. TESTING ARMATURE FOR GROUNDS |
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 SHORT CIRCUITS USING A GROWLER.
GROUNDS.
color. If the contact surface is rough,
ture slowly in the growler. A short cir-
pitted, scored, burned, or coated with
cuit will pull the steel strip tightly
hard carbon or oil, the commutator must
against the armature core and cause the
be resurfaced. If mica is not 0.025 to
strip to vibrate. If a short circuit is
0.032 inch below surface of commutator,
found, the armature must be replaced.
it must be undercut to the correct depth.
(4) Inspect armature shaft and commutator
for runout using a lathe or "V" blocks
and a dial indicator (fig. 22). If the run-
out does not conform to wear limits
surfaced providing the diameter will not
be below the limits specified in wear
limits. If refinished diameter of com-
mutator exceeds the limit, the armature
must be replaced.
(5) Inspect armature shaft splines for wear
or damage. Replace the armature if the
splines are defective.
(6) Inspect the commutator contact surface.
FIGURE 22. CHECKING
A satisfactory condition is indicated by
COMMUTATOR RUNOUT.
an even, highly burnished, dark-copper
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