PTO Yoke Pin Backed Out.

[Diggin It]

Working a rocky area with the tiller trying to reclaim it for planting. Seemed to go OK but there was a lot of vibration. I was traveling slow so as not to over do it. Once done, I parked the machine and was looking over a few things. Noticed that the collar for the PTO was hanging loose. Thought it had just popped loose somehow and was trying to re-seat it. That's when I noticed the roll pin (red arrow below) through the U-Joint Yoke and PTO shaft was most of the way out.

After I drove it back in, I started looking at the collar again and figured out it had been cut clean off (two blue arrows below) by the pin acting at a cutter.

Not too concerned about the collar. It can be glued or taped. I'm the only one any where near the machine, so no risk. But I'm wondering why the pin backed out. Just the vibration, or some other reason? Is this something likely to happen again? Should the pin be replaced?





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[Gator6x4]

Working a rocky area with the tiller trying to reclaim it for planting. Seemed to go OK but there was a lot of vibration. I was traveling slow so as not to over do it. Once done, I parked the machine and was looking over a few things. Noticed that the collar for the PTO was hanging loose. Thought it had just popped loose somehow and was trying to re-seat it. That's when I noticed the roll pin (red arrow below) through the U-Joint Yoke and PTO shaft was most of the way out.

After I drove it back in, I started looking at the collar again and figured out it had been cut clean off (two blue arrows below) by the pin acting at a cutter.

Not too concerned about the collar. It can be glued or taped. I'm the only one any where near the machine, so no risk. But I'm wondering why the pin backed out. Just the vibration, or some other reason? Is this something likely to happen again? Should the pin be replaced?


View attachment 650503


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You might consider using a double pin. Or you cold take your existing pin to a tractor supply store and see if they have a pin that will fit into yours and make your own double pin.

 

[LouNY]

Roll pins will do that at times especially in an application that loads and unloads them rapidly.
The spring may be losing it's tension or it's just not heavy enough for the job.
Some times you can add a smaller one that is a snug fit in the larger,
also many times you can pass a heavy wire through the roll pin and wrap it around half of the yoke with twist to secure it.
If it has done it once it will do it again.

 

[Diggin It]

You might consider using a double pin.

Double pin?

The spring may be losing it's tension or it's just not heavy enough for the job.

also many times you can pass a heavy wire through the roll pin and wrap it around half of the yoke with twist to secure it.

PTO as a whole is nearly new. Only used a few times since I got it with then tiller a year and a half ago.

I have some e-fence wire that might fit though the pin.

 

[LouNY]

Many times a pto shaft is sized minimally for the job.
Also as you said you were tilling in rocks which would impact loading all the way through the tiller and tractor.
Double pinning is two spring pins one inside the other to increase their spring rating.
The purpose of wire is to just prevent it from walking as far.

 

[Diggin It]

Also as you said you were tilling in rocks which would impact loading all the way through the tiller and tractor.

Yeah .....

 

[ptsg]

If the triangular tube doesn't fit the yoke with a tight fit, it will stress the spring pin as well, causing the pint to back out or to break in half.

 

[Diggin It]

Found a nail that would go all the way through and bent the ends over some. Hopefully that will help.

This is unworked ground that is basically a pile of red rock gravel with some dirt on top that hosted some green stuff. Maybe a bit more middlebusting, tilling, a few passes with the landscape rake, some manure and a year or two of some sort of cover crop will help.

 

[Gator6x4]

Double pin?



PTO as a whole is nearly new. Only used a few times since I got it with then tiller a year and a half ago.

I have some e-fence wire that might fit though the pin.

Yep Double pin. One pin inside he other or double side wall. Double roll pin question - Bersa Chat Forum

If close to a Graingers stop in and tell the clerk you need a double pin, roll pin. Coiled Spring Pins - Grainger Industrial Supply

 

[Diggin It]

Had another one of these back out:

https://www.tractorbynet.com/forums...-did-you-do-your-post5724946.html#post5724946


Not too fond of these at the moment, but so far they've been easy to fix and haven't caused any other damage.