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Most snow blowers have a "shear pin", (or roll pin) that links the auger to the drive shaft. It is there in case you strike something hard with the auger. The shear pin will break and protect the auger, the engine, and the operator. The shear pin can be purchased anyplace that services snow blowers, and it can be replaced by the owner.
You will need to remove the pulley #66 from the back of the unit, the bearing retainer #1, and the auger bearing bolts #18. The whole unit will then slide out of the housing. You can then remove the augers and then take the worm gear apart. That will get you to the auger shaft.
Your front end is jammed. Its either frozen or there is a rock or something jamming it up. Before you start engine reach down chute and turn back impeller that throws the snow out of blower. Should turn freely. when its free its fixed. You will probably need a new belt.
Most snowblowers incorporate "shear pins" between the motor and auger. A shear pin looks similar to a nut and bolt or pin that couples the drive to the auger - but it designed to break or shear off to prevent damage to the auger or motor in the event of a jam or overload. They look like these:
Only the shear pin recommended for your particular brand and model snowblower should be used. Under no circumstances should a regular bolt or other steel pin be used instead of a shear pin. Check your manual or consult with Swisher to determine the correct shear pin for your snow blower.
The most common cause of this is the drive belt is worn.
If you remove the cover (usually plastic) in the middle of the snow thrower and look at the belts.
Your operator's manual will show you how to remove the cover and check/change the belts.
The belt closest to the blower assembly drives the auger/blower and the belt closest to the engine drives the transmission.
With the engine not running, have someone depress the drive lever and check the blower belt.
You should only be able to depress the long side 1/2 inch or less. More than that the belt has stretched and needs to be replaced.
On some older blowers you can adjust the tension pulley, but most made in the last 15 years, you can't.
The belt may be frayed on the edges or glazed causing it to slip (it is shiny on the sides of the belt) It may be torn and broke completely.
You can get parts for you Craftsman and most Husqvarana, MTD made models through searspartsdirect.com. You can also get parts through jackssmallengines.com or your local dealer.
If you are unfamiliar with repairing machines take it to your local dealer. They will have a technician troubleshoot and repair the unit.
Feel free to ask any other questions to troubleshoot this problem farther. I know Snow Blowers. Please remember to rate this answer!