SEK Farmer - If only a few are still loose, is there a chance the square bar is notched from running loose thus causing the blade to get hung up in the notch and not slide when tightening the nut. You might have a round arbor bolt instead of square, but the principal still applies. It may require taking the hand grinder to the bolt and smoothing off the rough spots. And yes, if it is worn bad enough you may have to replace the arbor bolt.Also, are the disk blades you are replacing the same exact thickness as the old ones? boog - I loosen the standards before tightening. This allows for even tightening across the length of the arbor bolt This is another possibility, especially if the blades were ran loose or the thickness changed. Also, check the spools for wear. If they are worn it will throw off the whole thing.Here is an odd possibility. Are the new and old blades all flat or concave in the center? For instance IH blades have a flat center, while I believe some other mfg have a curved surface. If you have mixed one with the other things won't match. Did you replace any spools? If so, are you sure they are correct? For example, if you have an IH 490 with 9" spacing and replace a spool with one made for a 7 1/2" space .. the technical term is screwed. I've replaced or helped replace a lot of blades over the last 40 years (40 years? Can I possibly be that old?). I've seen everything from improperly made blades to wrong spools, to stretched or broken arbor bolts. We bought a used 490 a couple years ago and had problems with it not tightening. Someone had substituted spools from another brand of disk to make it fit and traded it in. That was ... interesting. One time Dad and my brother were tightening the arbor bolt on a Glencoe Soil Saver. One was tightening, the other did as someone suggested and hit the other end with a sledge hammer. Pulled the bolt right out of the big washer welded on the end. Our sandy soil is rather abrasive. Once we were tightening the nut with an air wrench and spun the thread off the bolt. I tell you all that to say this. Go back and look closely at the disk. You may have to pull the arbor bolt out to do it. But someplace you will find a simple answer to your problem. You just have to look for it typos .. I hate them. Why is you don't see them until the millisecond after you hit the {Submit} button?
Edited by Mike SE IL 5/17/2008 14:07
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How to tighten disc gangs?
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