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Post by Rockoonz on Jan 25, 2013 13:58:34 GMT -5
Split phase motors start with a start winding rather than a cap. there will be a centrifical switch on one end with a set of breaker points that switch from start to run mode. If the centrifical springs are broken or the switch contacts dirty it will act like you describe. Don't know where you are in Wisconsin but if you're close to Milwaukie here's a craigslist deal... milwaukee.craigslist.org/for/3526993303.htmlLee
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Jan 25, 2013 16:50:53 GMT -5
Thanks Lee, I didn't know how the motor worked, and didn't see a capacitor in it so I was wondering. The springs are good on the centrifical switch, but I didn't look at anything else on it. If the points are dirty, I just need to lightly sand them, right? I'll take a look at it again.
Also, thanks for the link. I'm 90 miles from Milwaukee, so not really a deal figuring in fuel cost.
Nate
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Jan 25, 2013 17:59:37 GMT -5
Well that didn't work. I tightened up the little bolts where the cord is connected (one was a little loose), checked the points and ran some emery cloth over them. They're bright and shiny now. put it back together and it still only hums.
I'm guessing this motor has seen better days. The wiring insulation is brittle and cracking apart on some of the wires. I taped over it for now. Ticks me off because it ran so good before.
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Post by phil on Jan 26, 2013 11:55:51 GMT -5
Maybe it had dirt and other debris blow in over that down time which is locking it up. Sounds like it's time for the float test. If it floats, it's still good. If it sinks, bad. Time to bite the bullet and buy a replacement. Try the HVAC shops in your area for a used one that has the right rpm, etc for what you need. I get used swamp cooler motors with one speed burned out, but the other good. Free that way. Just adapt your pulleys to get the same speed as before. Good Luck!
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robsrockshop
has rocks in the head
Member since August 2012
Posts: 715
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Post by robsrockshop on Feb 3, 2013 9:11:14 GMT -5
Humidty got to it, probably rusted the armature. You may get lucky........try manually turning the pulley several rotations while it is not plugged in and maybe even whack the motor with a hammer(im not kidding but don't do it as to dent it just tap it) and it may free up on it's own.
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robsrockshop
has rocks in the head
Member since August 2012
Posts: 715
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Post by robsrockshop on Feb 3, 2013 9:14:28 GMT -5
Well surely you already know if it will turn or not I hadn't ready you took it apart before I posted that. Another problem often is wasps building nests in them. I try to keep all my good motors in the insulated portion of the barn.
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Feb 4, 2013 20:43:37 GMT -5
I replaced the motor with a 1/4 hp dayton my dad had laying around. As long as I had it apart I also drilled new holes back farther to be able to move the motor back a touch to tighten up the belt.
When I took the old motor off, there was metal shavings laying in the mounting bracket, so something must have been rubbing. I'll junk the old one.
I cut a preform to test it, and it runs like new now.
Thanks for all the help guys. Although I was unable to resurrect the old motor, I learned a lot in the process.
Nate
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Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
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Post by Tom on Mar 7, 2013 0:45:00 GMT -5
It's one of two things, the start winding has failed open (not likely as it was just sitting) and motor is scrap, or the centrifugal switch is stuck open or has a broken spring. This can be fixed or replaced but it may be cheaper to just get a used motor.
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