Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My Craftsman garage door opener is not working - I opened the inside of the opener and motor is humming but gears are like jammed....when I prod the gears with a screw driver they do spin for about 3 seconds but then stop (maybe jam again) any ideas?

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I had the same problem. In my case the bushing for the main drive gear was worn out. This is just below the sprocket that connects to the chain.
What you should do is remove the chain and see if that sprocket shaft is loose in the bushing. The motor should turn without the chain on.
If this is the case check the plastic gears within the case. If there all chewed up and the bushing is shot you most likely need to replace the unit. If the gear's are still good you can replace the bushing.
I'm not sure how much Sears would charge to rebuild it but it is very possible it would be cheeper then buying a new one

Posted on Jan 04, 2011

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