Just sharing a recent discovery on my BX2816 snowblower after I started troubleshooting why I was breaking several shear pins on both sides of the auger and on the 4-blade chute fan every time I used the blower recently.
It was happening while engaging and disengaging the PTO, at lowest possible idle. I discovered that the two allen set screws on the upper sprocket were completely loose and the sprocket was freely sliding back and forth on shaft/key. I'm assuming the sprockets were getting misaligned and causing abnormal tension. I used red locktite, aligned the sprockets, and tightened them back down and have not had another shear pin break since. Pic here
Hope the helps
It was happening while engaging and disengaging the PTO, at lowest possible idle. I discovered that the two allen set screws on the upper sprocket were completely loose and the sprocket was freely sliding back and forth on shaft/key. I'm assuming the sprockets were getting misaligned and causing abnormal tension. I used red locktite, aligned the sprockets, and tightened them back down and have not had another shear pin break since. Pic here
Hope the helps
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When greasing check if set screws are tight.