Shear bolts are there to protect the machine from more severe damage. Using too hard of a shear bolt will generally result in something else like an expensive gearbox, or even the PTO on the tractor, getting damaged.
Your bush hog likely requires a special grade shear bolt somewhere between 2 and 5. They probably cost $3 each at the machinery dealer, which is why you are trying to use $3/lb grade 2 bolts.
IMHO, you've got a choice to make:
1. Constantly be replacing bolts.
2. Chance breaking something really expensive.
3. Use the right bolts even though they are more expensive.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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