My garage door opener motor appears to run but the chain/door doesn't move. Is there is possibly a part that
Craftsman 1.2 hp Model No.139.53415SR
Expert
Maestro
The most likely problem area is the worm gear/sprocket assembly but the first thing to do will be to test the unit with the door disconnected to be sure the problem is not some binding or failure with the door or lift mechanisms themselves.
The links below have more information on how to test for and locate the problem and what might be involved in a repair. The links are not on your exact model so some of the part or reference numbers may differ, but the basic systems, tests, and information will be the same. You can also use your model number and the information in the links to check what replacement parts might cost at the Sears Parts site to help you determine if you want to repair or replace your opener.
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