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What has failed when the door opener motor runs but the sprocket is not turning?

I have a 1/2hp Craftsman garage door opener model #139.53625. Initially the door would move a few feet then stop, forward or reverse, motor continuing to run. Now, if sprocket is moved by hand by pulling on chain, motor will move chain a couple of inches, then sprocket stops, motor continues to run through normal cycle.

2 Answers from these members:
Joey S
by Joey S Earned 8,004 community points in Craftsman
January 6th, 2009
0 votes
by MARY OSBORNE Earned 24 community points in Garage Door Openers
July 21st, 2016
0 votes
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