Auger broke weld sheared

You could take off the side panels of the Auger Housing and that should allow you to slide the auger off the shaft.
If you rotate the auger to see in the Sheer pin hole, can you see the remaining part in there? Sometimes the Pin will sheer AND the auger will rotate on the shaft a little bit which prevents you from getting a new pin to pass all the way thru both the auger and shaft. Make sure this did not happen in your case. I'm surprised you cannot get a Drift and knock the remaining piece of pin all the way thru. Again, make sure you issue is that the pin is stuck and not that the auger shifted a bit

If you start the machine and the axles spin but the augers do not it is because the shear pins are broke. If you look closely you will see the the augers have shear bolts and nuts or shear pins. If you jam a piece of ice or a stick in the augers while they are spinning the bolts will shear so you do not damage the expensive augers or the worm drive gears. If the axle spins with the augers you may have torn up the front worm gear in the front of the auger intake. If you spin the small auger and the large auger moves but when you start and engage the auger nothing happens you will have to remove the under cover and inspect the drive belt pulleys for jammed or broken parts or more commonly broken drive belts.

the shear pins shear because the auger is stuck or the shaft it is on has seized bearings
work in that area

IT SOUNDS LIKE YOU HAVE A TWO STAGE SNOWBLOWER WITH ONLY ONE STAGE WORKING. I BET THAT YOUR PROBLEM IS THE AUGER IS TURNING BUT THE IMPELLER BLADE THAT IS BEHIND THE AUGER HAS PROBABLY JAMMED UP WITH SOMETHING AND IS SPINNING ON THE SHAFT. YOU WILL HAVE TO REACH BACK AND GRAB IT AND TRY TO TURN IT ON THE SHAFT BY HAND.MAKE SURE THE BLOWER IF OFF!!!! . IF YOU CAN TURN IT BY HAND EASILY IT HAS EITHER BROKE A SHEAR PIN OR BOLT OR SOME TIMES THEY WILL TACK WELD THEM TO THEM TO THE SHAFT. GOOD LUCK

If the blower (impeller) turns and the auger doesn't there is a 90% chance you broke the shear bolts that protect the auger gear box.

Look at your auger and you will find the bolts shown at the arrows in this picture are missing. Some snowthrowers will have two bolts and others like the new Craftsman will have four.
You can get new ones at your local mower repair shop, your local Sears mall store, or online at sears.com.
Use shear pins or shear bolts not regular bolts. The shear bolts are designed to break off so you don't tear out the front gear box.
Feel free to ask any other questions. Don't forget to rate this answer!

If the blower (impeller) turns and the auger doesn't there is a 90% chance you broke the shear bolts that protect the auger gear box.

Look at your auger and you will find the bolts shown at the arrows in this picture are missing. Some snowthrowers will have two bolts and others like the new Craftsman will have four.
You can get new ones at your local mower repair shop, your local Sears mall store, or online at sears.com.
Use shear pins or shear bolts not regular bolts. The shear bolts are designed to break off so you don't tear out the front gear box.
Feel free to ask any other questions. Don't forget to rate this answer!

If the shear pins are not broke then you broke somthing in the transmission that turns the large augers.

does the 2nd stage auger turn? if the shear pin broke you may have ripped your belt part also. Take the belt cover off and inspect the belt assembly.

sure sounds like a shear pin, usually one end will be missing if it is broke. They are simple to replace but get one that is rated for your machine to avoid damage. Can you turn it freely without the engine running?? if so, it's the shear pin

When you got something caught in the auger, the shear-pin probably did it s job and broke, to save the gear box. Remove the old shear pin and install a new one