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Post by texaswoodie on Sept 1, 2010 10:42:02 GMT -5
I have a 3/4 HP motor with capacitor start. It runs strong if I start it by hand but won't start by itself. I'm assuming the capacitor is out. Can someone with limited motor knowledge change it out and if so where can I buy one?
Thanks!
Curt
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Post by Hard Rock Cafe on Sept 1, 2010 12:31:31 GMT -5
Curt: It should be pretty straightforward, with just 2 wires (I believe) once you get the cover off. Just match up the voltage and capacitance. McMaster has a good selection: www.mcmaster.com/#motor-capacitors/=8nr16aHope that helps! Chuck
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snuffy
Cave Dweller
Member since May 2009
Posts: 4,319
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Post by snuffy on Sept 1, 2010 15:00:44 GMT -5
Curt, that happened to my saw,the motor would just hum and I could get it started by pulling the belts by hand.Took the capacitor to a small electric motor shop and they said it was bad. They sold me one, 4 bucks ,back home in business.
snuffy
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Post by rockmanken on Sept 1, 2010 19:14:55 GMT -5
Yeah, take it to a electric motor shop. They can match the mfd (microfarad) and it is easy to change. Ken
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Post by texaswoodie on Sept 1, 2010 19:32:14 GMT -5
Thanks guys! Sounds like an easy cheap fix. I can stand some easy cheap for a change.
Curt
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Post by johnjsgems on Sept 1, 2010 20:17:13 GMT -5
Yes, two screws to remove the cover and two wires (usually stakeon connections). Sometimes the top will be popped or you will see something like tar leaking around terminals. If you have an ohm meter set to highest setting and measure across the terminals. If good it will read and drop as it charges. If bad it won't.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Sept 2, 2010 5:58:47 GMT -5
And just so your demise is not my fault... un-plug the motor . Ya, I know it's the obvious...now everyone that's forgotten raise their hand. Dr Joe .
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Post by Hard Rock Cafe on Sept 2, 2010 8:23:27 GMT -5
LOL! Good point Dr. Joe! I've never been shocked by a capacitor, but I am guilty of wiring circuits hot because I'm too lazy to find the right breaker.
Chuck
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Post by FrogAndBearCreations on Sept 2, 2010 9:08:14 GMT -5
Just remember that the capacitor holds a charge too!
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Post by johnjsgems on Sept 2, 2010 9:47:00 GMT -5
Yes, unplug power and short across capacitor terminals with a screwdriver. Another low tech motor diagnostic is to spin it backwards and turn on. If it starts backwards it generally has a bad start winding.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Sept 3, 2010 0:34:11 GMT -5
The capacitor will definantly give you a zap if its good, back in collage we would charge up small ones then toss them to someone. Instinct is to catch it, bad instinct but really funny.
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