This seems to be a pretty common problem with this machine (26 inch, 2-stage thrower). Rust seems to be the culprit since it was sitting for a couple of months before I tried to move it. I checked the common troubleshooting items (cable tension, broken gears, etc.) and it seems to be in the bearings. I am curious to see that all the gears move when I separate the hex shaft gears from the wheel axle gears, but lock up when they are engaged. So, which gear is the problem? Why does one of the wheel axle gears free-wheel (not fixed to the axle)? Someone mentioned that this gear uses needle bearings and he had to replace it (why?) How about the bearings at the end of the hex-shaft? They seem to be working (shaft spins freely inside), but I'm not sure if the outer bearing needs to rotate. Thanks for taking the time to read this very wordy post.