Craftsman C459-52222 Operator's Manual page 16

REPLACING SHEAR PINS
The augers are secured to the spiral shaft with shear pins and cotter
pins. If the augers should strike a foreign object or ice jam, the snow
thrower is designed so that the pins may shear. If the augers will not
turn, check to see if the pins have sheared. See Figure 20.
CAUTION
NEVER replace the auger shear pins with anything other than Sears
SKU# 88389/OEM Part No. 738-04124A replacement shear pins.
Any damage to the auger gearbox or other components as a result of
failing to do so will NOT be covered by your snow thrower's warranty.
WARNING
Always turn off the snow thrower's engine and remove the key prior to
replacing shear pins.
OPERATION
16
Figure 20