I have an old Craftsman 3/21 snow-blower (Model: 536.884581). The snow-blower starts perfectly, motor runs perfectly and the auger spins when the drive is engaged. When I use it to blow snow, it “sometimes” blows the snow out of the chute but later it stops blowing snow. I soon start seeing a lot of snow accumulating at the neck of the snow-outlet chute. I initially thought that the drive-belt was lose and hence tightened it. This did improve auger spin-rate but did not solve my problem I next checked on the internet and many folks suggested that the shear/cotter pin must have broken off in the auger-shaft. However, when I checked my unit’s underbelly, I did not see any shear/cotter pin on either side of the auger.
QUESTION: What corrective action (fix) should I take to make my Craftsman 3/21 Snow-blower throw/blow snow without collecting snow at the chute's neck?