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Implement Alley Discussion Forum

PTO Shaft Length

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HAS

05-15-2008 18:46:48




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What is the proper way to determine the correct PTO shaft length? I am matching a pull-behind brush hog to a Farmall A and my ground is very uneven. I don't want to either jam the PTO or have it come apart when crossing a dip or hump in the land.




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Tx Jim

05-16-2008 04:14:22




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 Re: PTO Shaft Length in reply to Gary,kansas, 05-15-2008 18:46:48  
If with pto attached and you turn your tractor at a 90% angle and shaft doesn't bottom out,this should be the farthest it would slid together under normal operation. The only other thing I can think of would crossing a really deep ditch. Turning shaft slides together and driving straight from corner it slides to farthest distance except going over humps.HTH's



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Hugh MacKay

05-17-2008 03:49:55




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 Re: PTO Shaft Length in reply to Tx Jim, 05-16-2008 04:14:22  
Jim: You raise a good point, HAS asked this same question on the Farmall page. I told hom of my experience matching a pto driven manure spreader to an offset Farmall 130. Maunre spreader was really to heavy for tractor, and PTO on that tractor is offset 8" from centerline of tractor. I knew if I went direct line with tractor PTO side draft would be too much for tractor with a full load. I split the difference with drawbar 4" off center from each PTO and tractor centerline of draft, and drawbar hole 14" back from end of PTO. It worked well on smooth but not necessarily level fields.

By the same sign, I could take that same spreader which called for drawbar hitch pin 14" from end of PTO shaft on my Farmall 300, and one could pull shaft apart or bind it up if he tried going through deep ditches, over road shoulders, climbing mountains, basically anywhere a mountain goat goes, etc.

Yes, I agree it is designed to work but it's also designed for farm conditions. The other factor a bush hog mower may have is a much longer telescoping shaft, and that will allow him to work in much rougher conditions.

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