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A Snow Blower Shear Pin, or Shear Bolt, acts as a safety mechanism to protect the auger drive shaft and gear case from being over-torqued. They are designed to purposely break if the augers get jammed or become clogged with heavier amounts of snow. Shear pins are only required on two stage snow blowers.
Shear pins are easy and inexpensive replacement parts for your snow blower, compared to fixing or replacing the auger shaft and gear case. Always have a backup supply, in case you break a few during use. Get your Ariens, Honda, Husqvarna, Toro, or any other snow blower manufacturer's shear pins at Jack's. Learn how to replace a shear pin.