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 belt closest to the blower assembly. This is the blower drive belt. (Your operators manual will show you the location and how to remove the cover if you are unfamiliar with your snow blower)
With the engine not running, have someone depress the drive lever and check the 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)
You can get parts (the new belt) through your local Ariens dealer or jackssmallengines.com
Feel free to ask any other questions. I know Snow Blowers. Please remember to rate this answer!
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