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Allis Chalmers 620 PTO Shaft conversion

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05-08-2008 20:14:39

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I am new to this list and hope that you all can assist me. I just purchased an Allis Chalmers 620 and it has what I believe is a 15 spline female PTO. I am looking for an adapter to go from the 15 spline 1 inch to a standard male PTO shaft.

Does anyone know where or how i might get one or get a used 1 inch 15 spline PTO shaft that I could use to make one?



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05-10-2008 12:23:33

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 Re: Allis Chalmers 620 PTO Shaft conversion in reply to ajestrab, 05-08-2008 20:14:39  
I compliment you for asking questions before instead of after! Here's the deal. The standard for category 1 tractors is: 7/8' holes at the ends of the lower lift points, 3/4' holes at the toplink bracket and a 540 rpm male PTO. Category 0 is: 5/8' holes at the ends of the lower lift points and at the toplink bracket and a 2000 rpm female pto. To make a conversion work, the first thing necessary would be a reduction gearbox (from 2000 rpm to 540). The only practical and safe solution is to stick with Cat. 0 equipment. Your tractor was not built to handle (the much heavier) Cat. 1 equipment. Cat. 0 equipment can be bought new or used from garden tractor dealers and occasionally can be found at auctions. Hope this helps because I've seen too much nice equipment (like yours) messed up by trying to make this work.

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