PTO Vibration

In a "new to me" 8N I've just converted to 12v and is working great with a Royse carb rebuild (it must idle down to 400 and so smooth!), I have a bad vibration when the PTO is engaged. Is this the dreaded warped or twisted PTO shaft that I will not be able to pull out from the back of the tractor?
 
(quoted from post at 16:00:59 03/06/17) In a "new to me" 8N I've just converted to 12v and is working great with a Royse carb rebuild (it must idle down to 400 and so smooth!), I have a bad vibration when the PTO is engaged. Is this the dreaded warped or twisted PTO shaft that I will not be able to pull out from the back of the tractor?

Did it have the vibration before you converted it to 12 volt and put on the rebuilt carb?
 
(quoted from post at 17:50:17 03/06/17) Duh, yea.

Duh, then converting it to 12 volts and putting the rebuilt carb on it had nothing to do with your question. Why muddy the water with it?

All you needed to post was this.

"I have a bad vibration when the PTO is engaged. Is this the dreaded warped or twisted PTO shaft that I will not be able to pull out from the back of the tractor"?
 
Do you experience the vibration when nothing is connected to the PTO?

FWIW, a twisted PTO shaft alone should cause no vibration.

Dean
 
There is nothing connected to the PTO; I was testing the new carb and governor with a light cultivator on the lift arms and breaking in some garden area. It vibrates with no implement mounted as well, and obviously vibrated before the 12v conversion; I did the things I know to do first. There is no leakage at the PTO mounting location around any of the four bolts or the shaft itself. The vibration is significant, and goes away when you move the PTO level forward to d/c it. I originally only mentioned the carb in order to compliment Royse on his most excellent work, there are a lot of jabs on these notes in recent weeks, and I try to compliment someone when I can. Of course, I know that the carb and a really smooth running engine has nothing to do with this vibration, and I noted that so that any responder would know I could distinguish that.
 
(quoted from post at 19:36:31 03/06/17) There is nothing connected to the PTO; I was testing the new carb and governor with a light cultivator on the lift arms and breaking in some garden area. It vibrates with no implement mounted as well, and obviously vibrated before the 12v conversion; I did the things I know to do first. There is no leakage at the PTO mounting location around any of the four bolts or the shaft itself. The vibration is significant, and goes away when you move the PTO level forward to d/c it. I originally only mentioned the carb in order to compliment Royse on his most excellent work, there are a lot of jabs on these notes in recent weeks, and I try to compliment someone when I can. Of course, I know that the carb and a really smooth running engine has nothing to do with this vibration, and I noted that so that any responder would know I could distinguish that.

How long has it been vibrating? Did it start out vibrating a little and then get any worse? Or is it just a steady vibration. Does it vary any with different engine rpm's?
 
The vibration increases with PTO speed, which is associated with engine speed. It is noticeable upon engagement of the PTO lever at engine idle or any higher speed. The lift works throughout its range, but is a bit sluggish. I have not put a bush hog on to see if that dampens the vibration or worsens it; this tractor is not set up for sway bars, so it was not purchased for that purpose. I figured someone here had gone through this before; though most of the threads on pulling PTO shafts seemed associated with leaking seals.
 
Thanks Jim, the compliment is appreciated!
My log shows I turned it UP to 400 RPM idle, 2200 RPM top end.

Anyway, on the PTO. Could it be a bad bearing?
Any up and down or side to side movement if you push/pull the shaft?
Normally I would expect the seal to wear out and leak too, but
worth checking I suppose.
 
Thanks, Royse; I thought it sounded about 400, but I have not got my tach out to check it; so that saves me a task. It is the slowest idle 8N I have ever heard and so smooth! I'm sure it would turn down to 350 or so, but no reason to do that. Just got the hood back on today (an awkward job when you're alone) and new gas line made from 1/4" brake line, new grill, etc.; so I was giving it a good work out to get up to operating temp and now have the oil draining overnight to change tomorrow. I will check for shaft movement tomorrow.
 
There is an over-running coupler on the shaft that I have not removed yet, and it has play of course. But there does not seem to be any in/out, side-to-side, or up/down motion on the shaft itself. I will be able to tell better when I remove the coupler.
 

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