Pto question

notjustair

Well-known Member
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).
 
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.
 
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.
 
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.
 

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.
 
(quoted from post at 06:48:41 06/01/14)
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.

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

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top