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Tractor Talk Discussion Forum

Pto question

Author  [Modern View]
Notjustair

05-31-2014 19:35:30
174.238.67.196



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Under normal circumstances, what do you think is the minimum amount of overlap on a telescoping pto shaft? If both pieces are four foot long (eight foot pulled apart) can the shaft be run with only one foot of overlap? That would mean it was extended to seven feet. How much overlap do you need for stability?

The reason I ask is that I am fiddling with my pull rotary mower. It has a two foot fixed piece with a pillow block and then the large telescoping piece. The pillow block has been cobbled and nothing works like it should. I am considering taking the stub shaft out completely and running it with one telescoping shaft like normal implements. I was just curious whether I could use the shaft pieces that are on it (I think they are each four foot pieces).

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Tx Jim

06-01-2014 03:48:41
69.35.160.115



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 Re: Pto question in reply to Bret4207, 05-31-2014 19:35:30  
notjustair

If both separated shafts are four ft long each and then 7 ft when slide together they will only be overlapped 6 inches which isn't enough overlap if ditches/terraces are encountered.



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Owen Aaland

06-01-2014 15:23:32
216.47.33.5



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 Re: Pto question in reply to Tx Jim, 06-01-2014 03:48:41  
Quoting Removed, click Modern View to see

Let's do the math on this one again :wink:



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gene bender

05-31-2014 22:29:01
67.55.226.121



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 Re: Pto question in reply to Notjustair, 05-31-2014 19:35:30  
One foot will not be a good idea it will blow up as 7ft is way too much length.



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funky_g00

05-31-2014 20:34:14
108.167.11.44



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 Re: Pto question in reply to Notjustair, 05-31-2014 19:35:30  
If possible, do a search for what type of PTO shaft that you have. I just did a quick search and what I found was a shaft 48" fully compressed could only be extended to 63", but there were different grades/ratings of shafts with different extention allowances for each grade. I personally have never seen or used a shaft extended more than half overlap (ie 48" - 72"). Having said this, I would not recommend using your current shaft maxed out to the limit. I agree with the other posts that turning and/or vibration will become an issue. It is a two piece setup for a reason.

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Paul from MI

05-31-2014 20:01:57
204.106.248.120



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 Re: Pto question in reply to Notjustair, 05-31-2014 19:35:30  
In order to run smoothly a PTO shaft must operate so that the angle of each universal joint is the same. Otherwise the driven machine shaft accelerates and decelerates twice with each revolution of the PTO shaft. Normally this is accomplished by making the hitch pin about midway between the universal joints. This is also why the crosses are in line with each other, not at an angle to each other.

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caterpillar guy

05-31-2014 19:54:47
75.134.175.75



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 Re: Pto question in reply to Notjustair, 05-31-2014 19:35:30  
Me thinks it will be a vibration issue when you turn. Since mowing usually requires some short turns. It will also probably hit the tire when turning.



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