PTO

[Arthur Strader]

Have a PTO problem,that I know someone can help
me with.On my 8N there is what I can an adapter
that connects to the tractor PTO,this adapter
which has been on the tractor for at least 15yrs.
I was bush hogging and the adapter came off from
the tractor and of course the drive line on the
bush hog came loose also.I was told by a dealer
that a pin went through the hole to hold it on
to the tractor PTO and a grease fitting went in
the other hole.So I installed the pin (had to
drive it in with a hammer.Guess what I made about five cuts and the same thing happen again
the pin was gone.Do I need a new part?Are what
can I do?Any help will be appreciated.I know that I called it an adapter,when there is another name,Thanks.

 

[Bruce (VA)]

I think what you are calling an adaptor is really an Over Running Clutch (ORC) See tip # 18 below.

If it's a standard ORC, get a roll pin of the correct diameter & length, (5/16 x 2”) slide the ORC back on the PTO shaft, line up the hole in the ORC w/ the hole in the PTO shaft & drive the roll pin in w/ a punch. You should have a grease zerk on one side of the ORC & a screw on the other that covers the hole.

Maybe you got a roll pin that was too small. If not, then it might be time for a new ORC.
50 Tips

 

[tractorfix]

There is a grease fitting to hold the pin. On the other side of the adapter or overrunning clutch, there is another 1/8 npt hole that also needs a plug or grease fitting installed.

 

[Ultradog MN]

If the adapter ie over running clutch has been on the tractor for 15 years it could be worn out.
Both the inside spline and the pto shaft splines could have significant wear that would cause the holes in the orc and pto shaft to be offset from each other. This would cause the roll pin to fracture and result in the problem you describe.
I have seen pto shafts where more than half of the spline was worn away. No way a roll pin would last on that tractor.
My advice is remove the orc and inspect both the shaft and interior of the orc splines. I'll bet you'll find your problem there.
Good luck.
Updates are always welcome.

 

[GA Dave]

 

[Sweating in Florida]

It maybe that you did not purchase a over running coupler but instead a adapter fitting the smaller pto shaft of the tractor to the larger splines of the more modern implement. And maybe the roll pin snapped when you stopped and the mower blades kept going.
GA Dave sent a picture of the ORC if yours does not have that barrel body then its not an orc. After I stop my Bush hog blade will continue to revolve for about a minute or so.
I have to thank the people of this forum for the advice about the over running coupler. I had no idea what one was.