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Forum topic by cajunjoe posted 08-24-2013 04:33 PM 755 views 0 times favorited 19 replies Add to Favorites Watch
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cajunjoe

11 posts in 1550 days


08-24-2013 04:33 PM

My older Delta 3 hp Unisaw has started “racing” when I turn it on and then trips the breaker. Any ideas?

-- Joe-----I cut it twice and it's still too short!


19 replies so far

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Loren

7580 posts in 2306 days


#1 posted 08-24-2013 08:01 PM

I have no particular insight, just some thoughts:

Take the belts off and try it under no load.

Belts could be glazed and slipping badly.

I suppose it may sound like it’s running too fast if the
bearings are bad.

-- http://lawoodworking.com

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Grandpa

3136 posts in 1334 days


#2 posted 08-24-2013 08:14 PM

Sounds like it can’t get off the start cap and onto the run coils. Not an authority on this by far but I would take that motor to a motor shop and let them check it out. Those are $800 motors…..at least that is about the price I was quoted. Might be a cheap thing to ask them to look at it.

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cajunjoe

11 posts in 1550 days


#3 posted 08-24-2013 09:23 PM

Grandpa—I took the motor off and for sure the start capacitor is a gonner! The bearings seem to be OK and taking the belts off made no difference. Thanks!!!!!

-- Joe-----I cut it twice and it's still too short!

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Shawn Masterson

1254 posts in 607 days


#4 posted 08-24-2013 09:23 PM

if it is a bad motor they can be bought from ebay for less than $400

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mantwi

312 posts in 555 days


#5 posted 08-25-2013 12:22 AM

I just priced a motor rebuild for a 3HP saw and it was estimated to run between $600.00 and $700.00. That’s harsh especially since a new motor was about 60% of the price. I’m with Grandpa on this one, sounds like the centrifugal switch has gone bad. It’s located beneath the fan on the outboard side of the motor, easy to access and a visual inspection can tell a lot. Look for burnt contacts and manipulate it by hand to see if it moves freely if it’s bad it’s a very simple fix. Be sure and unplug the saw first and discharge the start capacitor with an ohm meter or by crossing the contacts with an insulated screwdriver. The saw is running away and the high voltage/amperage from the closed capacitor circuit will fry it quickly. I just went through all of this myself and wound up replacing the motor, once burned twice learned.

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cajunjoe

11 posts in 1550 days


#6 posted 08-25-2013 01:07 AM

The start capacitor is for sure fried—-oil all over the inside of the protective housing. I assume I have to remove the motor end cap to get at the centrifugal switch?

-- Joe-----I cut it twice and it's still too short!

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mantwi

312 posts in 555 days


#7 posted 08-25-2013 05:34 PM

Correct, it’s behind the fan. Mark any wires if you decide to remove the switch, not sure it’s polarized but why take any chances. If you have a manual it should give a part number for replacement and be sure and use a start capacitor with the same voltage (usually 125) and mfd values as the one you are replacing. By the way, the capacitor is polarized so note where the connections are.

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Grandpa

3136 posts in 1334 days


#8 posted 08-25-2013 09:39 PM

Sounds like you are making headway. Good luck!

I am sorry Shawn but I have never found a motor for this saw at $400. I have seen adapters to use regular motors. The adapter was $100. Not sure the regular motor would work well though.

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Shawn Masterson

1254 posts in 607 days


#9 posted 08-25-2013 10:33 PM

3 hp lesson for delta unisaw 369+ shipping

Also here is another mount to use a standard frame motor

View Jerry's profile (online now)

Jerry

2197 posts in 2205 days


#10 posted 08-25-2013 11:34 PM

We bought a 4 hp Leeson motor for our Grizzly from the seller on ebay that Shawn refers to. Our Grizzly is the exact same motor mount as the Unisaw, we actually have 2 Unisaw table saws and one Grizzly cabinet saw, all are pretty much the same as Grizzly seems to have copied from Delta.

Our 4 hp Leeson turned out to be a great motor. Very happy. In any case, it sounds as though the problem is in the capacitor, but for any reason the motor is no good, go with the ebay seller, he has a great product.

-- Jerry Nettrour, San Antonio, www.topqualitycabinets.net

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Grandpa

3136 posts in 1334 days


#11 posted 08-26-2013 01:34 AM

I owe an apology to Shawn and I am told crow taste best when eaten fresh. Sorry…now I have seen a motor for a Unisaw for less than $400. Is it for a left tilt or right tilt saw? I didn’t see it but could have overlooked it. This is something you need to know before you order this motor.

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Jerry

2197 posts in 2205 days


#12 posted 08-26-2013 03:55 AM

Grandpa, the one I got is for a right tilt saw. A little road kill stew might be better than crow. I’m thinking some good old armadillo off the side of the road would be perfect with the right recipe…

-- Jerry Nettrour, San Antonio, www.topqualitycabinets.net

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Shawn Masterson

1254 posts in 607 days


#13 posted 08-26-2013 11:49 AM

Shot no need for the crow. We are all here to help each other. If you look at the description right at the top it says for most right hand tilt, but I am sure if you contact the seller he can direct you to the right motor for your app. I got all the info from jerry, I remembered his thread and just want to help.

View Bill White's profile

Bill White

3457 posts in 2619 days


#14 posted 08-26-2013 12:58 PM

Hey! That ain’t no armadillo. It’s a redneck speed bump. :))
Bill

-- bill@magraphics.us

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cajunjoe

11 posts in 1550 days


#15 posted 08-27-2013 05:24 PM

Update on my Unisaw 3 HP motor——took it to my local repair shop and he confirmed that the start capaciitor was bad; cleaned and adjusted centrifugal switch; repaired a broken wire (?); and replaced the bearings—$98.50. Needless to say I was thrilled! Thanks to everyone who responded.

By the way I have an excellent Road Kill Chili recipe that originated here in Texas.

I’m off to cut little boards from big boards.

-- Joe-----I cut it twice and it's still too short!

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