Rockwell 34-440 pulley problem

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Forum topic by elginrunner posted 05-14-2011 03:31 PM 3162 views 0 times favorited 6 replies Add to Favorites Watch
View elginrunner's profile


10 posts in 2569 days

05-14-2011 03:31 PM

Hello all,

I’ve acquired a Rockwell 34-440 contractor TS. I’ve been using it for about a month now, and have had the arbor pulley to vibrate loose or actually come off three times. The keeper key is a nice snug fit. The set screw does not have damaged threads, and turns as it should, all the way through. The arbor pulley is a Chicago die cast pulley 250 A. The belt is an V belt.

I’m sure as robust as this table saw is, there are many like it being used in this forum. Does anyone else have this issue??

On a side note, This is a great little forum. Lots of great information and friendly folks it seems.

Brock in NE Arkansas

6 replies so far

View Mickey Cassiba's profile

Mickey Cassiba

312 posts in 3030 days

#1 posted 05-14-2011 04:22 PM

Two suggestions for you. One is to lose the v-belt and get a link style belt. They can be found at Harbor Freight, for not too much dough. This will significantly reduce vibration stemming from the belt(but will not cure vibration from other sources). To keep the set screw in place, insert another set screw on top of it and crank it down. Works sort of like a jam nut.

-- One of these hammers oughta fix that...

View mrg's profile


823 posts in 2998 days

#2 posted 05-15-2011 04:42 AM


-- mrg

View bubinga's profile


861 posts in 2666 days

#3 posted 05-15-2011 08:36 AM

I had a Delta contractor saw, I think it was 34-444, anyway, if you’re having those problems I suggest it’s time to tune it up.
The One I had, I put machined steel pulleys and a link belt on it, and man ! what a difference.
I was skeptical as to how much good this would do, until , I put the upgrade on and fired it up, it was like a whole new saw, it ran so much smoother I couldn’t believe it.
Another thing is you must be sure your pulleys are lined up Coplanar.
The link below is where you can buy the tuneup kit, worth every penny.
The standard pulleys normally installed on Contracor saws are cast pulleys. They don’t run perfectly true and as a result, can create vibration in the saw. Machined steel pulleys run perfectly true and are perfectly balanced, so they will eliminate the vibration created by low quality pulleys
To be sure you get the correct pulleys, you should measure the bore of the arbor pulley before ordering. If you do not have a set of dial calipers, you should take the arbor pulley to a machine shop to have it measured.
Saw Performace Packages and Pulleys & Belts-Here

-- E J ------- Always Keep a Firm Grip on Your Tool

View elginrunner's profile


10 posts in 2569 days

#4 posted 05-15-2011 08:18 PM

Thank you both it sounds like good information. I’ll try to replace both pulleys and belt.

View wdwrkr's profile


26 posts in 3000 days

#5 posted 05-16-2011 01:28 AM

While you are at it, consider the setscrew itself. There are a multitude of point styles for setscrews. If yours is giving you problems, you may have the wrong style for the application. A knurled tip setscrew will bite into the shaft better than a cup point and give you more contact area. If you are using a cone point and the shaft has a flat, that may be the problem altogether. A cone point can’t find the centerline of the flat area and will eventually loosen.
Finally, use some Loctite 220, a medium strength threadlocker, which will prevent loosening of any setscrew. Check out for setscrews and Loctite.

View elginrunner's profile


10 posts in 2569 days

#6 posted 05-16-2011 01:54 AM

The set screw is the cup type. I have used a thread locker of the removeable type, not wanting to use “red” on and allenhead set screw.

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