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Eric

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

You might need to clean out the slots on the commutator
Also, make sure the brushes are the correct ones and have proper tension.
Eric