Figure 3-89. Removing shims.
(1) Check armature for shorts by placing it on
a "growler" and with a steel strip or a hacksaw blade held
on armature core, rotate armature. If blade vibrates,
armature is shorted in area of the core below the
vibrating blade. Copper or brush dust in slots between
Figure 3-87. Removing armature from stator.
commutator bars sometimes cause shorts which can be
eliminated by cleaning out slots. Shorts at crossovers of
coils at core end can often be eliminated by bending wire
slightly and re-insulating exposed bare wire. If short
cannot be eliminated, armature must be replaced.
(2) To test armature for grounds, place one
probe of test lamp on armature core or shaft and place
other probe on each commutator bar in turn.
Figure 3-88. Removing bearing retainer.