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 TM 55-1905-221-14-3
6-19.
STARTING MOTORS (ELECTRIC) (Continued).
LOCATION/ITEM
ACTION
REMARKS
TESTING (Cont)
An open circuited
armature is often
easy to detect,
since this condition
produces some badly
burned commutator
bars with other
bars fairly clean
Since the armature
is of a welded
construction such a
condition will be
rare, but if it does
occur, replace the
armature.
(3)
A short circuit may
occur between adjacent
armature leads due to
deterioration of the
insulation. To check
an armature for short
circuits, place arma-
ture on a growler and
hold a thin steel
strip lengthwise on
the core parallel to
the shaft. Slowly
rotate the armature
through a complete
revolution. If
a short circuit is
present, the steel
strip will become
magnetized and
vibrate. Inspect the
commutator slots
carefully, since
copper or brush dust
sometimes collects in
the slots and shorts
6-220
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