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

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I got liftmaster garage opener , when I hit the botten to open the door, the motor dosen't run but make noise , if any one had same problem before and can help me to know what is the problem

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Check the nylon gear to see if it is striped. do you see white shavings around the area?

Posted on Apr 27, 2009

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Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor unit and will be obvious if it is bad. The part number is 41A2817 and is available from any door opener service company. The part will come with instructions.

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If the door hits the garage floor and then reverses to the open position you need to adjust the 'down limit' which is on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

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I had the same problem. Took the cover off of the opener and found that the gears were stripped on the unit. Motor was fine. You can order gear replacement kit for the unit. They are a plastic type sprocket and worm gears. The kit comes with spindles and all necessary clips. You have to take the unit off the ceiling to replace the gears, but the process if very easy to do. Parts kit about $40 on line, much cheaper than a new door opener. Total process took less than 2 hours, including getting the unit down and back up again.

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