Dumb shear bolt questions: Tractor Implements  -- Tractor Attachments Implements 3ph Discussion Forum and Review Dumb shear bolt questions: Tractor Implements -- Tractor Attachments Implements 3ph Discussion Forum

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 06-04-2004, 11:11 Post: 87719
kwschumm



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 Dumb shear bolt questions

I was chipping some damp material and the tractor started lugging so I shut it off to clean out the blower chute. This got me to thinking about protective devices for the pto driveline. My rotary cutter has a slip clutch, but it appears there is no safety device on the chipper. If it had a shear bolt where would it be? Could a cheap shear bolt be added easily? Are they available off the shelf? I know a slip clutch would be around $100 but for this application a shear bolt should work fine and be cheaper. The chinglish chipper manual leaves lots to be desired.






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 06-04-2004, 12:17 Post: 87722
DRankin



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 Dumb shear bolt questions

Near as I can tell, a shear bolt for a tractor implement is just a standard grade (non-high strength) bolt.

I have seen special (weakened) bolts for certain applications such as low powered snowblowers.






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 06-04-2004, 13:03 Post: 87726
AnnBrush



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 Dumb shear bolt questions

Here is a good African (where people usually get by with less) standby: Standard mild steel (flux coated) welding rods make excellent shear bolts as the metal is soft and will shear easily, they are always available and usually very cheap.






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 06-04-2004, 13:47 Post: 87729
yooperpete



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 Dumb shear bolt questions

Most of the shear bolts that I've seen are about 3/16 diameter or larger. Which is bigger than flux rod. If you can't find brass or if they don't hold up, I use round head square neck bolts (i.e. stove bolts). They are softer than any other steel bolt available.






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 06-04-2004, 13:50 Post: 87730
shortmagnum

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 Dumb shear bolt questions

Ken, your teacher would tell you, "No shear bolt question is a dumb shear bolt question." Smile

My 5' cutter uses 1/2" dia. bolts so even the soft ones are pretty stout. Maybe the chipper isn't subjected to the extreme forces that the brush cutter is but it seems that it might be easy to accidentally throw in a rock or something.
Dave






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 06-04-2004, 14:15 Post: 87731
Murf



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 Dumb shear bolt questions

Ken, it's not a dumb question.

Unfortunately a chipper, by design, is a tough thing to protect. It has a VERY heavy fly-wheel which would transfer most of the shock load onto the chippers balde before the driveline even felt it.

The only protection which is practical on a PTO-powered chipper is the internal PTO clutch unfortunately.

Best of luck.






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 06-04-2004, 16:11 Post: 87737
kwschumm



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 Dumb shear bolt questions

Thanks, guys. With Murf's response I guess I won't worry about it. This chipper has a pretty big 175 lb. flywheel so there's lots of inertia there. One time it lugged on me it stalled the tractor so it seems that the pto clutch doesn't slip much either. Lesson learned - don't try to chip for at least 12 hours following a good rain Smile






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 06-04-2004, 16:34 Post: 87742
Murf



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 Dumb shear bolt questions

Ken, I can't believe that the dampness has much to do with it.

We have used ours in pouring rain and it made no difference at all. A chipper is a pretty simple beast and the different manufacurer shouldn't change anything, a flywheel and a blade are the same in Chinese as they are in Finnish.

If anything I would think the water would lubricate the blade and soften the wood making the cutting even easier.

Best of luck.






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 06-04-2004, 17:00 Post: 87745
kwschumm



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 Dumb shear bolt questions

I wouldn't have thought the dampness would hurt either but it sure seemed to. The blower chute plugged three times in the morning following a rain but as the afternoon came and stuff dried out there was no more plugging. I suspect it has something to do with the fir needles. They don't have much surface area to catch the airflow and when they are soaked they weigh more than normal. Whenever it plugged there was tons of fir needles in the chute. Chipping wet deadwood with no needles wasn't a problem.






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 06-04-2004, 19:55 Post: 87753
TomG

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 Dumb shear bolt questions

You'd think that there be some protection for the pto drive and clutch in event the chipper jammed. Maybe the theory is that the chipper would tear itself apart first.

There was a discussion here where a person with a rotary cutter blade jammed into the ground. The pto clutch burnt up before the tractor could be shut down and the cutter has a slip clutch.






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