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

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Gaarage Door I'm opening the garage door manually. I disconnected the trolley to do this. When I lift up the garage door is there something to keep the garage door up. After I remove my hand off the handle the door just rolls back down. I dont know what type of mechanism is used to keep the door up. The door works fine using the remote mode.

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Have you looked on both sides of the door at the bottom there should be cables. If they are not tight you probably have a damaged spring. Look up between the door and where the roller mounts are, there should be a tightly wound spring. This is what keeps the door up, if tension is lost then it will come back down. If it is broken it needs professional attention.

Posted on Jan 06, 2009

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The torsion springs might need adjustment.

Pull emergency release, and manually lift door to half-open position.

When you release the door, it should stay in place.
If it almost "slams" down, the springs are not doing their job to "balance" the weight of the door itself.
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You said you adjusted the up limit already. Is it adjusted as far as possible? Usually the screw will become harder to turn. You mention a new door and spring but is the opener the same? My guess is you have a new opener as well and it is out of sync with the trolley. Try turning the up limit back and see if the trolley will stop shorter. If it does, loosen the chain or belt so that you can remove if from the opener's drive gear. Bring the trolley to your stop limit and put the chain/belt back on the gear. Adjust the chain/gear tension and try door operation again. If it was a sync problem, the door should close closer to your limit. Adjust up and down travel as necessary to fine tune it. This worked for me so good luck.

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