need help in locating old delta part

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Forum topic by z28 posted 03-30-2009 06:35 PM 3322 views 0 times favorited 7 replies Add to Favorites Watch
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2 posts in 3367 days

03-30-2009 06:35 PM

good morning,

i am in need of a part for an old delta super 990 1hp. radial arm saw. i need the rotor / armature assembly. one of the rotor bars has broke on mine . i have been told by a motor shop that it will be too costly to try to fix . if you can give me any help or advice, it would be greatly appreciated.

7 replies so far

View BlankMan's profile


1490 posts in 3376 days

#1 posted 03-30-2009 06:38 PM

Have you tried Delta? Not sure how old the 990 is but I picked up a Rockwell/Detla 12-RAS a few months ago that was manufactured in ‘78 and I was able to get parts for it I wanted to replace. Be interesting to see if motor parts would still be available for yours.

-- -Curt, Milwaukee, WI

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John Gray

2370 posts in 3908 days

#2 posted 03-30-2009 07:14 PM

I did a little research and the links below may be of interest to you.

-- Only the Shadow knows....................

View Pete_Jud's profile


424 posts in 3776 days

#3 posted 03-30-2009 07:16 PM

Delta’s web site will not find the Super 900. I am in the process of restoring one right now. I have been told that they were built in the late 1950’s. Good luck, and please respond back if you find parts.

-- Life is to short to own an ugly boat.

View mmtool's profile


22 posts in 3590 days

#4 posted 03-31-2009 12:03 AM

I some research and found a 33-990 Delta RAS. It looks like you would have to get a whole motor because that is the way Delta sells it. Delta doesn’t sell the parts individually for the 990 motor. The Delta 33-990 has 2 motors and one of them is obsolete. I am not sure which one you have, but the active Delta motor part # is 424021310008 and runs over $700.00…
I have one back in my shop to repair right now and it has the same problem…the rotor. Too expensive to replace the whole motor:(
Good luck!

-- Don, Utah,

View BlankMan's profile


1490 posts in 3376 days

#5 posted 03-31-2009 02:40 AM

A Super 990 is not a 33-990. The Super 990 was a Rockwell era saw, also referred to as a RAS-1A. A Super 990 has the dual over and under arm’s like Delta’s current line of high end RAS’s have, i.e 33-891. The 33-990 has the single arm traditional design.

-- -Curt, Milwaukee, WI

View BlankMan's profile


1490 posts in 3376 days

#6 posted 03-31-2009 03:00 AM

Looking at the parts breakout for the Super 990, my 33-791, and the current production model 33-891 you can see some evolution in the motor. The Super 990 motor and my 33-791 motor look quite similar. There are some slight differences in the motor when going from the 33-791 to the 33-891. But the mounting, how it attaches to the yoke is similar with minor changes.

So I’m wondering if you could adapt a 33-891 motor, which I’m sure would be available, to the Super 990. If the distance between the yoke arms is the same or wider that may be doable. Some machining may be necessary. The rear pivot pin looks to be a larger diameter so you’d probably have to purchase the pin and the hole in the yoke would need to be reamed. I say reamed because you want a good fit and you wouldn’t get that by just drilling the hole larger. And reamers are cheap. The front pivot point hub, or Front Trunnion as Delta calls it, may have to be replaced with the one the 33-891 uses and some machining may be necessary for it to fit in the hole in the yoke. Or possibly the old Front Trunnion could be used by drilling it to mount to the newer motor. Worst case one would have to be machined from scratch. Something any machine shop could easily do. It wouldn’t surprise me at all if the Front Trunnion from the 33-891 would fit perfectly in the 990’s yoke, Delta changes things slowly once they have a good design.

I’d possibly consider taking this route, unless Delta wants my first born for a 33-891 motor. But it might be possible to pick one up surplus on the cheap. Or a 33-791 motor or any in the 33-89x or 33-79x family. Course I have an edge, a metal lathe and milling machine so I could fabricate the parts I needed.

-- -Curt, Milwaukee, WI

View Matt's profile


181 posts in 3395 days

#7 posted 03-31-2009 04:46 PM

I was assuming this was a vintage restore and you wanted an original part. I did a search on the big auction house and there is not much out there. ;) Sorry, I’m not much help

-- Matt - My Websites - - Hand Tools :: - Small Shops

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