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Farmall & IHC Tractors Discussion Forum
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Woodruff key on PTO

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J.D. Palmer

04-20-2005 16:03:23




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I have now sheared the woodruff key on my PTO twice on my farmall super A. Does anyone know the reason for this? Im using my cutter when it happens, I know the shear pin works on the cutter cuz i broke it also.




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J.D.Palmer

04-21-2005 06:58:38




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 Re: Woodruff key on PTO in reply to J.D. Palmer, 04-20-2005 16:03:23  
Michael...The shaft on my Super A does'nt have a set screw. It does have a hardened screw on the end, which was tight. The key fits tight in the slot, so i cant see how putting a set screw in the key, would make a difference? Am i missing something? My cutter does have a shear bolt.



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Michael Soldan

04-21-2005 15:59:27




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 Re: Woodruff key on PTO in reply to J.D.Palmer, 04-21-2005 06:58:38  
JD, if you are satisfied that the key cannot move with the set up you have that is good, I was thinking that if the key could come loose and wiggle out it would be mere seconds before the bolt would shear, most keyways do have some form of set screw to keep the key in place, if your cutter has a shear then you shouldn't experience any problem with the pto shaft, yet that is what I understand is happening. A key and keyway should not wear loose or grind out if they are in tight and set, I hope you solve the problem...Mike

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J.D. Palmer

04-21-2005 17:00:39




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 Re: Woodruff key on PTO in reply to Michael Soldan, 04-21-2005 15:59:27  
Maybe i just got a bad key the second time around, I'll just try it again. Thanks for your help.



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Michael Soldan

04-21-2005 06:23:38




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 Re: Woodruff key on PTO in reply to J.D. Palmer, 04-20-2005 16:03:23  
JD, Chris, Captaink, maybe I am misunderstanding the set up that is the problem, but the shaft end that has a keyway should of course never shear or break, the shear pin that is the safety feature should be at the opposite end of the shaft..at the tractor pto...so the way I am picturing this a new piece of keystock should be cut and placed into the slot, a set screw should be tapped through the shaft into the key to hold it in place, then a hard bolt should go through the existing hole in the shaft and tightened harshly. At the pto end there should be a collar for a shear pin of softer material. Now if there is no set screw holding the key it could wiggle loose and fall out wherupon the bolt could break, assuming it is not of hard quality. The set screws are hardened and drilled hollow at the end so it will cut into the key and hold it securly. I had to mess with a shaft on the snowblower this winter and the trouble was with a set screw that didn't do its job...good luck getting this shaft working...Mike in Exeter Ontario

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Chris Brown

04-20-2005 17:16:16




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 Re: Woodruff key on PTO in reply to J.D. Palmer, 04-20-2005 16:03:23  
I tore into a 230 that someone had welded the pto gear onto the shaft.Must be they had the same trouble and did'nt care to fix it right.



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captaink

04-20-2005 16:40:55




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 Re: Woodruff key on PTO in reply to J.D. Palmer, 04-20-2005 16:03:23  
If the PTO gear does not fit snug on the shaft, this will lead to easier shearing off of the key. Unfortunately, the only way to correct a loose gear on a shaft is to replace the worn parts. You could try using a softer shear bolt to see if that will take some of the “jar” off the PTO when the shear bolt breaks. It’s tempting to take them to a machine shop and have the key cut out oversize. That might keep it from shearing off, but may cause damage to something else further into the drive line.

Maybe someone else here has some ideas…

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