Jointer motor humming, not running...Help

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by John_G posted 01-15-2018 01:31 AM 1174 views 0 times favorited 4 replies Add to Favorites Watch
View John_G's profile


165 posts in 3469 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

-- John Gray

4 replies so far

View WhyMe's profile


1281 posts in 2338 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


10477 posts in 4425 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


1021 posts in 1418 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


3798 posts in 2000 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.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics