I have a Craftsman snow blower, 536.884582. The augur is not turning when the handle is engaged. The engine is running fine and the augur turns freely when the engine is stopped. There is nothing visibly wrong in the augur housing. I don't have a manual; so am unsure about how to trouble shoot the problem. Is there an easy way to get the manual (it's unavailable for downloading from Sears)? Meanwhile are there any quick checks I can make inside the paneling on the augur drive side?