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CJT

wrote:

I noticed that our central vac didn't sound right today. I took the plastic
housing off the top of the motor so the commutator and brushes were visible
and started it up. After a few seconds of operation I start to see the blue
spark between the brushes and commutator start to extend almost 1/2" in the
direction of rotation around the commutator. As this happens the speed of
the motor slowly begins to drop. The motor was overhauled last April; new
bearings and brushes.The vacuum is 22 yrs old so the commutator on the motor
has seen a lot of wear but it looks in reasonable shape. Anybody have an
idea what might be happening here?
Thanks,
Mike

It sounds to me like whoever did the overhaul used the wrong brushes.
They're probably shedding carbon.

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