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Check Brushes
Before disassembling armature, check brushes for wear.
•
Make sure brushes are not worn to the point
where brush wire bottoms out in the slot of
brush holder.
•
Brush springs must have enough strength to
keep tension on the brushes and hold them
against the commutator.
•
If brushes are in need of change, replace the
entire end cap assembly.
End Cap and Brush Assembly
Armature Check
If commutator bars are glazed or dirty, they can be
turned down in a lathe.
•
While rotating, hold a strip of 00 sandpaper
lightly on the commutator, moving it back and
forth.
NOTE
Do not use emery cloth.
•
Recut grooves between commutator bars to
depth equal to the width of the insulators.
1.
Using a continuity tester to make certain no
continuity exists between the commutator (copper)
and the iron of the armature
2.
Rotate armature and check out all commutator
bars.
NOTE
The armature can be thoroughly checked with a growler if
available.
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