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It's a Sears 5-inch job from '54 I picked up in more-or-less working condition. It was absolutely filthy and needed lube so I disassembled it to clean and lube it.

When powered off, the rotor (now) spins freely. When power is applied, the rotor seizes and the stator buzzes loudly. I flipped the stator around in several ways with no luck.

What do?

It's a Sears 5-inch job from '54 I picked up in more-or-less working condition. It was absolutely filthy and needed lube so I disassembled it to clean and lube it. When powered off, the rotor (now) spins freely. When power is applied, the rotor seizes and the stator buzzes loudly. I flipped the stator around in several ways with no luck. What do?

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[–] • 1 pt

Did you changes the brushes? If they are badly worn they could move and jam when power is applied. Just a wild guess.