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

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Opener will hum but not engage the drive train.

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If the humming you hear is the motor running you need to remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. If it is the motor humming but not turning you have a bad start capacitor which is held by a bracket and is next to the motor.

Posted on Sep 30, 2009

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Sounds like your operator ran past the limits and the traveler is jammed against the front or rear stop bolt. if you remove the cover and turn the motor shaft you should be able to free up the traveler. then reset the limits. You might have to replace the bottom bushing on the motor bracket. It will come with part # 41c4220a.

Posted on Oct 02, 2009

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