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John Deere Tractors Discussion Forum
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Oversize PTO

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Joe Evans

08-08-2004 19:26:35




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What can anyone tell me about an oversized PTO shaft on a JD GM? The shaft measures 1-3/4". This is on a friend's tractor, and he would like to know why it's an odd size.




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Joe Evans

08-09-2004 19:55:53




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 Re: Oversize PTO in reply to Joe Evans, 08-08-2004 19:26:35  
Thank you, gentlemen. I will pass the information along.



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Clooney

08-09-2004 05:01:27




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 Re: Oversize PTO in reply to Joe Evans, 08-08-2004 19:26:35  
Joe, there was a range of those G"s that had the larger 1-3/4" PTO shaft splines.. There wasn"t an industry standard for PTO size or spline size at that time so Deere just over-killed those G"s with a large shaft & splines.. Deere later offered a kit to bring that shaft down to industry standard size..

You can use a spline adapter but that places the front PTO shaft u-joint a long ways back from the rear shaft bearing & places a tremendous strain on the PTO shaft when turning corners & the u-joint starts to bind up.. You usually have to lengthen out the drawbar to get the front u-joint close to pivot point. If you have an aftermarket 3-point hitch on that G it gets even worse.. I have in the past cut the 1-3/4� splines off & welded on the later smaller splines from a later tractor..

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John T

08-08-2004 19:39:59




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 Re: Oversize PTO in reply to Joe Evans, 08-08-2004 19:26:35  
Joe, Ive owned a few G's with the larger 1 3/4 PTO and its my understanding the industry at that time wasnt yet standardized to the 1 3/8 PTO and the G had pretty hefty torque for its day rememeber. Some of the smaller tractors like some of the Fords had the even smaller 1 1/8 PTO in that time period. I just used an adapter on the G's I owned and had no problems.

John T



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