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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

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 01-03-2005, 07:26 Post: 103337
millsg



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I must admit that I am a city boy who is making a slow migration to the farm life (hey, maybe they could make a TV show about this!).

This weekend my wife drove her tractor into a hole while mowing with her King Kutter rotary mower. By doing so the mower's shear bolt did its thing and sheared.

My question is this, are bolts of this type a special type of bolt or will any standard bolt work as a replacement? The bolt head has 307A & CYI on it, I assume this means something.






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 01-03-2005, 08:42 Post: 103343
denwood



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Just use a regular bolt, not a hardened grade 5 or 8. YOu may want to look into getting a slip clutch option. They are not terribly expensive and save the PITA of switching bolts.






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 01-03-2005, 09:11 Post: 103346
NHDaveD

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Ask a stupid question. There is no such thing as a stupid question. Well actually the only stupid question is the one that you don't ask.

With that said - I would be carefull and check with your manual, your dealer, or even King Kutter if you have to. In my experience shear pins are special bolts that have a slight "scoring" that allows the bolt to shear. This allows the shear bolt to be the first thing that breaks before any harm is done to any of the machines drive train and/or mechanisms.






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 01-03-2005, 12:01 Post: 103357
Iowafun

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NHDaveD has a good point that you will want to seriously consider. Any/all shear pins/bolts are designed to be the weak link. It's hard to tell if they used a specialy designed bolt or not. It would be nice to find out if you could use a plain-jane grade 2 bolt in it's place.

I also like the idea of a slip-clutch in the long run. My dog keeps making fresh holes in my yard. So you never know when you will hit another one.






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 01-03-2005, 12:11 Post: 103358
yooperpete



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I use carriage bolts (roundhead square neck) since they are about as soft as you can get and still are steel.






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 01-03-2005, 13:55 Post: 103369
shortmagnum

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I buy 1/2" x 3" grade 2 bolts, lockwashers and nuts but the pound at my farm store. I'm constantly shearing them because I'm usually making new trails in the woods where there are lots of hidden stumps. I always carry a hammer, punch and wrenches in my tool box.

Tractor Supply has the PTO clutch kit for just under $100. It will be one of my first purchases this spring.
Dave






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 01-03-2005, 15:04 Post: 103373
denwood



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You will love the slip clutch, I have one on each of my bush hogs. Just don't set the clutch too light, it will burn up if you are not watching. Setting too tight is also bad. Mine are at the same setting they came with and do slip now and then. My time is too short as with many people and I can't imagine putting in a new bolt as many times as it sounds like you do. I used a post hole digger with a shear pin once. I bought a hydraulic one and sold it. 1 pin per posthole is enough to drive you nuts. Hydraulic also has reverse.






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 01-04-2005, 12:05 Post: 103428
Iowafun

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Last winter, my tractor was having major problems (flat tire) and I didn't have the plow on the ATV. Got stuck using the snow blower. Major rocks in driveway would shear an auger pin about every 20 minutes.

Drive it back to the shop, bust off the ice, punch out the old pin, put in new bolt, move more snow. It got real old, real fast.

Look at a slip clutch.






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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

Thread 103337 Filter by Poster:
denwood 2 | Iowafun 2 | millsg 1 | NHDaveD 1 | shortmagnum 1 | yooperpete 1 |




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