AKFF

Hello all, thanks for having me.  I bought a Toro 828 LE Power Shift Snowblower off of Craigslist and am having some issues.  Well, I assume I'm having some issues, it only throws snow about 1 and a half feet.  Granted this wet snow was a little wet and heavy, but it shouldn't have had a problem.   Both stages are spinning when engaged and I checked all the linkages that I could see and they all looked good.  My question is, what order of things should I check?  I can't find the guy that sold it to me so I'm stuck.  The motor seems like it's running OK and the it is self propelled just fine.  So any help on what to check would be helpful, I have tools and general mechanical know how.  Thanks in advance.