Is the blower front or 3 pt hitch mounted?
Blowers have shear bolts for the fan and the auger.
On 3 pt hitch models the pto shaft would have a shear bolt that protects the fan and auger but the auger would have its own shear bolt.
I have looked up the parts illustration and see a 3/8"x2" shear bolt.
View attachment 92769
Dave