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Old Dewalt RAS possessed by dumb pixies

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Forum topic by Luthierman posted 12-26-2016 03:14 PM 628 views 0 times favorited 8 replies Add to Favorites Watch
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Luthierman

178 posts in 924 days


12-26-2016 03:14 PM

Just recently as part of a deal with finishing a remodel, the client asked us to kindly remove this near perfect condition Dewalt radial arm saw. Boy, is she a beauty. Problem is, it may or may not spin in the right direction when turning it on. Sometimes it will do nothing like it is stuck between poles. When that happens all you have to do touch it and she spins right up. I haven’t broken the case apart yet as it has never been done before. From what I can tell, there aren’t any brushes in this unit. My slightly educated guess tells me the starter capacitor is toast or the switch isn’t working properly. I was just wondering what thought the fine folks here might have.

-- Jesse, West Lafayette, Indiana


8 replies so far

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Loren

9627 posts in 3484 days


#1 posted 12-26-2016 04:06 PM

I’ve had a couple of motors where I had to
give the sheave a push to get the motor
to stop buzzing and start running. A new
capacitor fixed the situation.

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Fred Hargis

4757 posts in 2330 days


#2 posted 12-26-2016 04:43 PM

I’ve read of this happening a few times. The motor isn’t reversible and most of the times I’ve read of this happening it was solved by replacing the capacitor. That’s a very nice saw, well worth rehabbing. But there’s almost nothing inside the motor that can make it runs backwards, they are so simple it’s hard to come up with an explanation. Here’s a pic of that motor opened up, what you see is the grand total of the inner parts. If you get it fixed soconsider replacing the bearings ($20 +/-), they almost always need that done.

-- Our village hasn't lost it's idiot, he was elected to congress.

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JoeinGa

7722 posts in 1843 days


#3 posted 12-26-2016 04:43 PM

I think it’s just a worn out old piece of crap… and you should let me take it off your hands. No need to thank me, that’s what LJ friends are for ! :)

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

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Luthierman

178 posts in 924 days


#4 posted 12-26-2016 04:58 PM

Thanks fellas. Pretty much confirmed it for me. I was thinking with the simplicity of the motor it had to be the capacitor. It’s been sitting idle for 30 years.

Nice try Joe. I know a score when I see it.

-- Jesse, West Lafayette, Indiana

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hairy

2586 posts in 3369 days


#5 posted 12-26-2016 05:07 PM

Go here for good info: http://forums.delphiforums.com/woodbutcher

You will probably have to create an account , it’s a good place to learn what you need to know.

-- My reality check bounced...

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Luthierman

178 posts in 924 days


#6 posted 12-26-2016 05:42 PM

Fred, you wouldn’t happen to know the values of the capacitor, would you? I’m several 100 miles away from the saw for the holidays, and am trying to kill some time.

-- Jesse, West Lafayette, Indiana

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DirtyMike

637 posts in 738 days


#7 posted 12-26-2016 07:40 PM

mine was a type 804
200-220 mfd 110vac
6236

that is for a different 1963 saw dewalt saw but it may get you in the neighborhood. I have noticed that replacement capacitors can be longer and have a thicker diameter. so check for measurements you want that puppy to fit under the info plate.

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Fred Hargis

4757 posts in 2330 days


#8 posted 12-27-2016 12:06 PM

I sold my MBF and no longer have it to look at (replaced with another Dewalt). Sorry. Like dirtymike indicated, sizing can be an issue…it’s best to have it in hand when you look for a new one (or at least the measurements from it).

-- Our village hasn't lost it's idiot, he was elected to congress.

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