You have a bad clutch/pulley, this is part number 12002211, You can order the parts you need from the following places, http://www.apwagner.com/, http://www.repairclinic.com/, http://www.searspartsdirect.com/, or http://www.partstore.com/, all of these places offer easy returns and reasonable prices for their items.
I have also included a link for the service manual for your machine, just click on the blue link below to download it to your computer..
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