The drive shaft applies torque to the shear pin, which then applies it to the auger. However, if the auger rusts to the drive shaft, they’ll become one and the shear pin will never break. If that happens, the auger clog can cause major damage to the machine. Lubricate the drive shaft to prevent it from rusting to the auger. Remove shear pins and lubricate the drive shaft with lubricating oil. Then spin the auger to spread the oil along the length of the shaft. Reinstall shear pins.
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