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PTO Shafts

John M

John M

Well-known Member
Location
Nunyafn business
Morgans post below reminded me! Had a u joint go out on my brush hog and in the process it bent the yoke. Instead of trying to fix
this one, Im just going to get a new one or at least get the section that connects to the tractor. The old one had the pin you
have to push in to get it on the shaft, and my fingers just cant push it in anymore, so Im looking at one with the slip collar. My
buddy has one hes willing to sell me, barely used, but its the CV joint type, and I would have to cut 6" off of it, which isnt a
problem. Is there any advantage of the CV joint type over the Ujoint type, considering I only use the hog maybe twice a year for
10 - 12 hours each time? BTW, the one that got messed up was close to 30 years old, thats how little it gets used.
 
If your hands can't function with the pin, doubt you will have better luck with a heavier shaft sliding the collar. You better try it out before you cut it. chris
 
CV stands for constant velocity and is used where vibration at high turning angles can be a problem. U joints singly, are prone to vibrations due to shaft lengths being different along the length of the power train. One shaft is driving and the other being driven. If they aren't traveling at the same speed due to different lengths, they vibrate with it increasing as the turning angle increases and the speed difference increases.

On a 3 pt mounted mower U joint shafts work just fine. Only when you get into pull type does it matter (because the joint is now subject to lateral and vertical loads) and the CV excels....BTDT ASC stocks the shafts and their cheap ones work just fine....BTDT They come in different power ratings so you need to buy the one to fit your requirements. If you have a problem answering that question call them and speak with a rep. who will walk you through it. BTDT
 
CV type is usually used to give more angle when turning without chattering, it probably won't hurt in your instance but will be heavier to hook up. If you have a pull type mower it might be good for a 3 point mounted it really won't be an advantage but won't hurt either. The other disatavantage is it will be more expensive
 
(quoted from post at 08:27:56 10/11/18) If your hands can't function with the pin, doubt you will have better luck with a heavier shaft sliding the collar. You better try it out before you cut it. chris
Click to expand...

Ditto cv joints are heavier than regular u-joints therefore more difficult to handle when attaching to tractor pto shaft. CV joints are a lot more expensive to repair than regular u-joint. CV joints are mainly utilized on pull type implements.
 
John, Sometimes I use a top link pin to bump the pin down when I pull or push on the u joint.
My fingers and hands don't work like they use to.
I think a small machinist hammer would work well and also could be used to bump the u joint on or off the PTO.
Richard in wet NW SC
 
"Ditto CV joints are heavier than regular u-joints." Yepper....as I have said before, there is one on the tractor end of my JD 375 baler and lining up the
connection and getting it connected, working alone, with the design as it is, is a kingsize PIA. I just bought another tractor this year so that in the
haying season I can hook the baler to my cab tractor and leave it doing the cutting (which needed the size of the cab tractor) with the new addition.
 
I've found the sliding collar type are even more of a PIA than the pin type. Lube up the pin real well with WD40 or something, and get it working freely before you try to put it on.
 
Thats exactly what I have ben doing the last few times I hooked it up. I dont know, it could just be the pin on this one. Ive never been able to push it down very well, even when new.
 
Didnt think there was that much of a weight difference! Interesting. My buddy never mentioned his was heavy, bu hes twice the man I am, and its all muscle. Besides for what he wants for it, I can still get a U joint type cheaper. I have a while before I need it agin, so Ill think some more on it. At least I dont have to pull it apart, though.
 
The sliding collar is part of the JD CV joint I mentioned. More of mother deeres fine designs...................
 
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