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Jointer motor humming, not running...Help

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Forum topic by John_G posted 01-15-2018 01:31 AM 730 views 0 times favorited 4 replies Add to Favorites Watch
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John_G

165 posts in 2889 days


01-15-2018 01:31 AM

I’ve had this jointed for years, once a few years ago it stopped running and just hummed. I took it apart, sprayed it out, put it back together and it worked just fine. I also tried replacing the capacitor firstwhich did nothing. Now it’s started again, I have no idea what’s wrong or what to do. I hope the YouTube link works. Any ideas comments or suggestions would be greatly appreciated.

John Gray

https://youtu.be/fwZ8Z_KM7qg

-- John Gray


4 replies so far

View WhyMe's profile

WhyMe

1073 posts in 1759 days


#1 posted 01-15-2018 01:36 AM

Centrifugal switch is not engaging which connects the capacitor or capacitor is bad. Check the cap with a tester.

View Loren's profile

Loren

10477 posts in 3846 days


#2 posted 01-15-2018 01:42 AM

Try taking the belt off, turning it on and
spinning the sheave by hand. Sometimes
the motor will pick up and go. Leave it
running for 15 minutes. Turn it off and on
again and see if it starts on its own.

View JohnMcClure's profile

JohnMcClure

310 posts in 838 days


#3 posted 01-15-2018 02:30 AM

Agreed with both above. You can verify that it’s the cap or centrifugal switch by doing Loren’s suggestion; if a hand-start gets it to pick up, the failure is in the cap or centrifugal switch. If a hand-start won’t get it running, something else could be going on. Like an open in the run winding – you can check that with an ohmmeter. Should be less than 3 ohms resistance, typically less.

-- I'd rather be a hammer than a nail

View splintergroup's profile

splintergroup

2422 posts in 1420 days


#4 posted 01-15-2018 03:45 PM

Try the hand spin up test (if safe for you) first. If the motor is not totally enclosed TEFC (totally enclosed, fan cooled), you may have gotten some sawdust inside that is blocking the centrifugal switch. Give it a good blow out with compress air.

Start capacitors live in the “hump” cover on the side of the typical motor. Easy to access, at least for a quick visual inspection of any burning or swelling.

A humming motor that won’t spin up is almost always one or both of the mentioned parts.

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