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9" 1/3 h.p. model 137.219090 drill press right out of the box today. Motor hums, won't turn with belt on. With belt off, will spin, but can easily be stopped instantly by a bare hand grabbing the drive pulleys. No torque! This is a replacement drill press today because my older one, 8" 1/3 h.p. suddenly developed the exact same behavior while drilling wood. Power is fine-- same symptoms on multiple circuits of my home, including the one that drives the well pump. It would seem both motors are defective in absolutely identical ways. What could be wrong? I bought this from Craigs List-- the guy got it last Christmas and never opened the box. All plastic bags were still sealed, and I assembled it from original factory packing. Thanks, Loren M. Williams loren@lorenlogic.com

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Obertelli
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SOURCE: drill press motor hums and barely turns

The motor has either got worn brushes or more likely the windings have been attacked by moisture and gotten the dreaded "green spot" (corrosion).

Worn brushes can be replaced if the commutator is still good. But failed motor windings require a new or reconditioned electric motor.

Posted on Mar 12, 2010

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