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Bench grinder, 110/220?? wired up properly




By westpennmowe on Nov 07, 2009

" "
bench grinder, 110/220?? wired up properly according to diagram on grinder, just turns on as soon as it's plugged in but it just humms, it does not spin the grinding wheel.it is a monster w/ a 3/4 hp motor, 8'' wheel

dayton bench grinder, model 4z909c

Clarification Request

Posted by Bat1956 on Nov 07, 2009

How old? Ran ok for you before? Is the capacitor OK?

Solution #1

posted on Nov 16, 2009
Not Rated)

fredy2

Rank: Wiz 
Rating: 84%, 358 votes
LIKELY the capacitor which is usually in the base is bad.

The capacitor shifts the phase angle in one of the two windings which creates a pseudo rotating field to start rotation.
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