Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
You can increase the 'up force' which is a control on the rear of the motor unit near where all those white wires go. You should also remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and may be going bad. If it is it will be obvious.
Posted on May 17, 2010
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Posted on Jan 02, 2017
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