snowblower auger problem

Hello. Here's my problem, I hope someone can help.
I have an older (about 25yrs old I think) Craftsman snowblower. This is the first winter season that I've used it (I purchased from the previous owner of my home), but did have it all tunued up and checked put before using it. Eveything checked out.
I first time I used it, I noticed that when I tried to go through deeper snow, one half of the auger used to pickup the snow would stop rotating. The other half would continue to rotate though. The portion that had stopped was connected via a chain to another smaller rod with tines (positioned along the top of the front auger cover). I figured that this side of the auger was just getting jammed up, as there is not a lot of room between the auger tines and the cover.
Since then I've had some additional problems that I was able to fix myself (twice the wheel drive stopped working - once due to a slipped chain and once due to a broken axle shear pin).
I just replaced the axle pin, and the motor and wheel drive both work great, but now as soon as the augers hit any resistance either one or both sides of the main auger stop moving completely. When under no load at all, they spin properly. This didn't start happening immediately after changing the shear pin (I'd been using it for about 20 minutes), so I think it's likely unrelated to anything I could have done within the wheel drive assembly compartment, but I might be wrong.
I'm not sure what the problem might be. Any suggestions would be greatly appreciated! Please feel free to 'dumb it up' a tad when giving your ideas, as it seems I'm just mechanically inclined enough to get myself into trouble!
Thanks in advance,
Corey
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It sounds like the augers don't have their shear pins installed on their axles and are only free-wheeling due to friction. With the machine OFF check the axles of both augers and you should see where shear pins should be installed. If you find where they should be and are missing (bolt holes without bolts) don't install regular bolts but get actual shear pins from your local hardware store.
Ron

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