Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Remove power from the opener. Then, pull the red release rope and manually lift open the door. It should move with little effort. Next, pull the door halfway down and let go. The door should stay where you left it. If it fails either test, the door lift springs need replacement or adjustment. If it works ok, follow the proceedure in the owners manual for adjusting the up and down limit sensors, and the emergency reverse adjustment.
Posted on Aug 02, 2008
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Posted on Jan 02, 2017
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