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Restoration & Repair Tips Board

pto question - shear pin or slip clutch

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andrew r

05-21-2004 07:08:20




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I have a quick question. I have a 6 foot Lilliston super six rotary mower and I am having problems with the pto shaft. There is a shear pin at the front of the shaft where it connects to the pto output of the tractor. The coupling has gotten loose and woobly, and now I'm constantly shearing pins. I want to get a new front half of the pto shaft, but most I've seen don't have a shear pin. I have seen slip clutches that you can installon the output shaft that would do the same thing I think, but they are expensive, and I'm not sure if they would do what I want them to. does anyone have any suggestions? I'm really tired of changing about 10 to 15 shear pins when mowing an acre. And no, the mower isn't binding or anything like that. The shear pin coupling is just plain worn out. Thanks for any help.

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harry k

11-22-2006 16:54:19




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 Re: pto question - shear pin or slip clutch in reply to andrew r, 05-21-2004 07:08:20  
I had a machine shop cut tge shaft, weld on a stub drill a new hole All this for $45.00 solved the problem



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george md

05-22-2004 21:38:18




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 Re: pto question - shear pin or slip clutch in reply to andrew r, 05-21-2004 07:08:20  
Andrew, Welcome to the club of lilliston owners, ten to one the problem is not only the loose yoke , but the shear pin hole is worn in the shaft and the yoke. I have an 8 ft deck model called a 7-6 with the same problem but not quite as bad . I have machine shop and do mostly repair work, when this one gets bad enough , I will spray weld the input shaft to the gear box, replace the yoke and ream the shear bolt hole large enough to clean up the wear . It is a great mower , makes a finish like a lawn mower . Parts are becoming extinct ,got some blades from a NH dealer near fredrick this year. Bushhog bought lilliston and forgot to make parts available , old lilliston will run forever and spoils the bushhog sales . Until you decide to fix the shaft and the yoke, do not apply power quickly and don't decelerate and accelerate with the power applied to the mower . Apply power slowly and keep it steady.

george

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Andrew Reinhart

05-23-2004 03:28:16




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 Re: Re: pto question - shear pin or slip clutch in reply to george md, 05-22-2004 21:38:18  
George, thank you very much for your help. You are the first person that has really understood what I am talking about. Actually, the person before me welded the whole shear pin assembly together because is was getting wobbly, and installed a new shear pin assembly in front of it. It is right in the part that connects to the pto output shaft of the tractor. I think it uses a smaller shear bolt, it's only about 1/4 inch, and I think the old shear bolt was about 1/2 inch. Is it a lost cause for me? I never figured it would be so hard to get a new shear pin assembly. It's such a nice mower, but I don't have a lot of welding experience, and no one around here seems willing/able to help me out. Thanks so much. Andrew R.

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george md

05-23-2004 19:46:41




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 Re: Re: Re: pto question - shear pin or slip clutc in reply to Andrew Reinhart, 05-23-2004 03:28:16  
Andrew, 1/4 inch bolt is not big enough to stand the HP required to run that mower, original shear bolt was 7/16 dia . Ream the hole to 7/16 and try it. If you are running the mower with a low HP tractor you can probably get away without a shear bolt set up . Being belt drive and having the blades swinging as they are , I have not sheared a bolt from hitting anything . I shear them from either a quick start or some sputtering of the engine ( water in the gas ).

george

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Ol Chief

05-22-2004 20:31:54




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 Re: pto question - shear pin or slip clutch in reply to andrew r, 05-21-2004 07:08:20  
Have you checked out what grade of steel pin you are using versis the grade recomended.I am assuming that you are actually using a steel bolt which is general practice.I believe it requires a grade 5 bolt or pin.That grade of bolt will have three raised lines standing on the head.If you are using a grade 2 mild steel bolt that may be the problem.Grade 2 has no marking.Ask your implement dealer.

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txblu (Kim feature this)

05-22-2004 16:57:06




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 Re: pto question - shear pin or slip clutch in reply to andrew r, 05-21-2004 07:08:20  
You are changing pins because of a problem. Fix the problem and you will quit shearing them.

Slip clutches are nice but they require maintenance and are unreliable. They have to be loose to spin when needed, but not too loose so as to spin when not needed. They are subject to problems from being idle and weather.

A shear pin is like an animal. Totally forgiving, loves you regardless. Not like a human (slip clutch) that always has conditions attached.

Solve your problem and get the pin.

txblu

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JMS/MN

05-21-2004 14:06:18




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 Re: pto question - shear pin or slip clutch in reply to andrew r, 05-21-2004 07:08:20  
If you buy a slip clutch to handle overloads, you still need to address the problem with the front half of the coupler. Have you checked with the Lilliston company for the front half? If that is renewed, it should solve the problem. It is probably cheaper than the slip clutch that you think is too expensive.



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Andrew R

05-22-2004 03:44:01




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 Re: Re: pto question - shear pin or slip clutch in reply to JMS/MN, 05-21-2004 14:06:18  
Actually, I am going to replace the whole front half of the pto shaft. Lilliston does not have the parts I need anymore, I already checked with them. I just need to decide if I should get a slip clutch, or try to find some other kinda of shear pin setup. Thanks, Andrew R.



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