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

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Chamberlain LiftMaster Pro 2245 garage door has started making a noise (slight clunking) only when closing. I disconnected the garage door and the noise continues. I've looked at the sprockets and the look fine. I would think that if it were a spocket/gear the noise would be heard in both directions. Any ideas?

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I would take a close look at the sprocket/gear assembly. There is a bronze bushing that wears and lets that assembly lean. This can cause the chain to miss the teeth on the sprocket just a bit and will cause some weird noises. If it gets bad enough the chain will come off the sprocket. I have no idea why it would only do it in the down direction when there is much less strain on the whole thing. You might also remove the cover from the motor unit and check the drive gear. It is white nylon and wears out. It will be obvious if it is going bad.

Posted on Mar 21, 2011

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