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Shear bolts ?


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#1 Alc ONLINE  

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Posted April 05, 2011 - 09:37 PM

I used a homemade sub soiler to cut the tree roots next to the garden . I hit one that stopped the tractor . Figured if I backed up and gave it another shot it would come out. Well it didn't and broke the welds off where the top link attaches. I welded it back but was thinking that some type of shear or break-away would be the correct way because maybe next time something worse will break , maybe just use smaller bolts instead of the 3/4" ones ?0403091752.jpg

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#2 wvbuzzmaster OFFLINE  

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Posted April 05, 2011 - 11:59 PM

What grade of bolt are you using right now? If you are using grade 5 or better I would be tempted to say drop it down to a non graded bolt (mild steel) at minimum. I know they make shear bolts in some capacity but not sure when they are designed to break... or what capacity you need them to break to avoid breaking major stuff... You could buy a pile of regular mild steel bolt and take your bandsaw to them and cut them to break on both sides of the top link. Worst case you get the cuts too deep and keep breaking them, but cheap to make more and less time consuming I'm sure.
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#3 NUTNDUN OFFLINE  

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Posted April 06, 2011 - 05:08 AM

With how the top link attaches Al, I don't think you will ever have to worry about breaking anything other then the bracket. With that being said I think shear bolts or a lower grade bolt would help so maybe you won't have to keep doing welding repairs.
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#4 Alc ONLINE  

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Posted April 06, 2011 - 05:13 AM

Good idea Casey , I'll just get some grade 5 3/4 bolts and grind them where the draw bar and sub soiler meet , thanks, Al

#5 wvbuzzmaster OFFLINE  

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Posted April 06, 2011 - 09:52 AM

No problem Al, happy to help.

#6 olcowhand ONLINE  

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Posted April 06, 2011 - 10:53 AM

If the new weld has no more penetration than what gave way, you have no need for shear bolts at all, as the weld will give again, saving possibly worse damage.
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#7 Alc ONLINE  

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Posted April 06, 2011 - 11:03 AM

You right , the old weld was so poor , there was paint under it !!! I bought this tractor with broken frame ,which broke the transmission too. You can see the angle reinforcments under the axle tube , I didn't have a wleder at the time so a friend did it for me .
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#8 ducky OFFLINE  

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Posted April 06, 2011 - 11:52 AM

I would surely try to have to tooth fail going to the rear instead of have the top of the tooth fail to the forward direction.
Just because you are in the seat and to prevent damage to the tractor from the 3rd arm or something else coming forward.
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#9 Alc ONLINE  

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Posted April 06, 2011 - 01:39 PM

Ducky , couldn't agree with you more , if you look at the rear end cover it got a little damaged when the welds broke. Al
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