How do I replace the shear pin on a Toro Model 521 snowblower?

As you look at the auger, you will see that a gearbox separates the auger. To the left and right of the gearbox you will see that the auger is attached to a pipe. The shear pins are located on this pipe; although you may not see the head of the shear pin (actually a bolt head and nut) because once the pin has sheared the bolt head and nut often fall off. One side usually remains intact and you should be able to locate the shear pin. Look at the opposite pipe and you'll find a hole where the shear pin should be. As you rotate the auger while looking at the hole (You may need to raise the blower up a little to take the weight off the auger) you should see a "sheared pin". Once the holes are lined up, you should be able to tap out the sheared piece by tapping the new shear bolt into the hole. Secure the new shear pin with the lock nut. Do not over tighten; the nut just needs to touch the pipe.

Rob
December 2007