King Kutter Rotary Cutter

I use 7/16" diameter grade 2 shear bolts on my King Kutter. Don't know if it originally had 1/2" or not. I break very few bolts now, other than on an occasional rock, anthill, or low-flying stump.

I have it on a 40 hp A-C D-15. You'll find if you ease into heavy loads (like maybe you did on your saplings), you'll break fewer bolts due to decrease shock loading. I still keep 2-3 bolts in the toolbox on my tractor for when the unexpected break occurs.

Be careful with your cutter. They don't forgive human error.

Best of luck!

Tom

Really doubt if you have 7/16" shear bolts. That must be one monster of a cutter. LOL!

Allan

Then I hooked to my 45 hp tractor, the tractor won't even bog, when it hits something, just a quick pop and a broken pin. The additional HP will overcome the shear pin strength, the Kubota just didn't have the power to break it.

But, since safety is important, always make sure the shear pin should is a grade 2. A Slip clutch is much safer. If you put in a grade 8, plan on sooner or later buying a gear box or worse.

Rick

The shear pin is designed to "shear" when too much pressure is exerted on the shaft leading to the gear box. To echo IDF, you do not want a grade 8 bolt, go with something softer, I would suggest grade 5. The shear pin is cheap in comparison to the gear box. Since you are new to this, you may want to "walk" into this process and buy a few 3 grade bolts just to get a "feel" for how the shear system works.

Good luck,

Dug

You would be amazed at what a bush hog will grind up. I've ran over car tires, fence posts, concrete blocks, dead dogs, and even an old air conditioner buried in the weeds. With the proper shear protection and/or slip clutch, they'll keep right on mowing along.....for a while! John