My snowblower does not push out the snow like it use to does the secind stage have a shear pin?

Hi,
No I do not think any use it. May be wrong but the easy way to see is to tie off the machine in the engaged position and try to turn the impeller. If it spins freely, then I am wrong and yes there is one. Usually it is the auger that has them as that is most likely to encounter a "dangerous" object.
Peace,
Clarke

I would also check to make sure the auger belt is tight enough.