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Drive shaft variations

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How many different drive-shaft lengths are there? why I ask: I had a major failure of the engine to fiber disk bolts on my 712. seriously bent the drive shaft, destroyed the disks, etc. Makes a lot of noise, but did much less damage than it would have had it been the other end. I had two drive-shafts from previously retired tractors, a 410, and a 7119. Measuring the old one best I could, I had one that I thought was the same, and one about 2" longer. When I went to put the closer one in it was about 1/8" too long. I was able to adjust the BGB yoke that much, and make it work, but I was surprised to see that? Any one with encyclopedic knowledge out there?

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If you want encyclopedic knowledge I'm afraid you are SOL with me. My pages are getting moldy and dry rotted. They seem to fall apart everytime I open my mind up:p 4 to 6 over the years and models I think, maybe more. I think I currently have 4 different sizes out in the shed at the moment. Cant remember what lengths they are off hand.

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Went out with the tape measure and did some measuring: 17 3/8" (7100 Series made for wide rubber coupler) 18 1/8" 18 3/8" 18 3/4" 19 1/8" I know the ones on the 700 & 725 tractors are 20 some inches long too, but dont have one.

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