My Sears Garage Door Opener Model 139.53960srt is having a problem where the chain comes off of the sprocket when reversing during an emergency opening.
The chain on my garage door opener comes off of the sprocket when the door suddenly reverses during an emergency opening (e.g., when there is an obstruction). This has happened several times lately. Inspection of the sprocket shows that it is tilted slightly out of horizontal, and it appears that this is contributing to the chain coming off when it turns. Is this the cause and how can I fix. When I re-installed the last time, I made sure that tension was correct, so I do not suspect this to be the problem. Please help. Many thanks.
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