Resolved: Jet JWP-15CS 3HP motor start capacitor

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Forum topic by Holbs posted 04-17-2016 05:06 AM 707 views 0 times favorited 5 replies Add to Favorites Watch
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1347 posts in 1450 days

04-17-2016 05:06 AM

Topic tags/keywords: start capacitor

Finally getting back in the shop after a month hiatus. I’ve been working on new blast gates and my Jet 15” planer motor woes. Last month, I went to turn on the planer. The motor hummed but no belts turned. Oh crap… I can not afford a new 3HP motor. So, investigation and research time…
I come to find out, the #1 reason for a motor hum/does not work is the start capacitor: thankfully, an easy and cheap thing to fix. To first find out, I bought a capacitor tester from Amazon for $17. This is no Fluke tester but seeing how I may test a capacitor or 2 once every 40 years, I felt this was a good choice. And here is the first test. It should be hovering near 500 but instead it hovers down in the 350’s. Not so good:

The Jet 3HP motor has a start capacitor of 500 MFD. I took this unit down to my local motor repair place (the kind of place that rewinds motors and mostly work on 3phase boys). And they verified it was a faulty capacitor. Oddly enough, there were no physical / visual identifiers of it being bad. A tester was the only method. They sold me a somewhat similar brand with different terminals. Brought it home, and this was the test:

Hooked it all up and the motor starts flawlessly. Whew. Now to re-install back into the planer. Just wanted to let other LJ’s know about start capacitors and easy/cheap fixes.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

5 replies so far

View knotscott's profile


7146 posts in 2796 days

#1 posted 04-17-2016 11:38 AM

A job well done!

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View Holbs's profile


1347 posts in 1450 days

#2 posted 04-17-2016 04:04 PM

Oh…I guess I should toss in that the Vanguard capacitor was $22. I could of went the amazon or $8 online route, but this was an area I am not comfortable with and went with the pro’s recommendation.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View JoeinGa's profile


7370 posts in 1428 days

#3 posted 04-20-2016 05:30 PM

Good for you.
You dodged a bullet on that one !

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View Redoak49's profile


1820 posts in 1409 days

#4 posted 04-20-2016 07:34 PM

Very good…always great to hear how someone solved a problem.

View Underdog's profile


878 posts in 1456 days

#5 posted 04-20-2016 07:39 PM

I had the same thing happen on several JET 1014 mini lathes I’ve turned with. I tried using an aftermarket capacitor, but fried it immediately.

In the long run it was cheaper to buy one from Jet. As long as it was a phone order that is. Ordering online the shipping was $20, while the part was only $11, and weighs less than an ounce…Phone order shipping was about $10.

-- "woodworker with an asterisk"

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