After a long day of blowing snow with my BX2822 Snowblower, it suddenly broke the fan shear bolt. I replaced it, and when I engaged the snowblower again, the new bolt sheared again. I replaced it with my last one. This time, I removed the snowblower and rotated the quick coupling by hand; it was smooth, and no issues were found. After reinstalling the snowblower, I engaged it, and it almost immediately broke the new shear pin. At this point, I removed the snowblower again and put on my plow to finish cleaning up the snow. Any suggestions on where to look for the problem? I checked the Messicks website for available parts, and Kubota sells everything except the gears for this snowblower.