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

1 Answer

Door can be opened manually when the trolley has

The garage door can be opened manually when the trolley has not been disengaged. It does require you to lift pretty hard but my second door does not do this. Any suggestion?

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  • Don Maggard May 11, 2010

    What is the make and model of your opener? Might help.

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You can adjust the length of the arm between the trolley and door so that it is in a vertical position when the door is closed. This will prevent your problem.

Posted on Oct 05, 2009

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1 Answer

My son disengaged the latch while the door was open. Then he manually closed then opened the door. When I got home the door was half open and not latched. the trolley on the track was approx 3ft away


If the track is a screw thread, then just latch the door anywhere along the track, and it will realign itself.
If the track is a chain-drive... then push door up until it clicks into latch.

Gene

Oct 09, 2014 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door opener just hummms


For chaimberlain family openers, the gear inside is shredded. For genies screw drives, replace the trolley. Assuming you have not disengaged the door from the opener by pulling the red cord.

Aug 19, 2014 | Building Materials

1 Answer

Motor hums but does not open garage door


Either the opener trolley is disengaged or you have a broken gear/sprocket assy.

Mar 26, 2014 | Sears LiftMaster Building Materials

1 Answer

Sears garage door opener model 139.53919


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.
The opener isn't designed to overcome the weight of the unsupported (no spring assist) door.

Over time, the springs take a "set", and might need a readjustment
THIS IS A JOB FOR PROFESSIONALS!!!
The springs are under tremendous pressure loading, and can even kill someone if they do not know what they are doing!

Feb 04, 2014 | Building Materials

1 Answer

Garage door opener wont switch from manual to electric again


I think what you mean is you pulled the rope to open and close the door manually and now you can't get the two halves of the trolley to reconnect.
If so, pull straight down on the rope and release. Then run the door so the two halves of the trolley connect. You may have to do that last step manually. If this isn't your problem post back.

Jan 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener 1/2 hp will not open door


It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens 1 foot, then stops.


It sure sounds like you have a broken door spring. While you are at it remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Might be stripped and unable to take the weight of the door.

Jun 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opening theGarage door manually


two problems. why aren't inner and outter trolley connecting. did you leave rope is disconnect position. Second problem is door springs do not seem balanced. you should be able to lift door halve way up and let go. it should pretty much stay there; go up or down slowly ok. fly up or crash down; need to adjust springs/cables or maybe wrong springs.

Jan 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears garage door opener, chain adjustment


Loosen the inner nut on the trolley. (That is the lock nut). Then tighten the outer nut on the trolley to increase tension. The outer nut on the trolley is closest to the garage door. The chain tension should be 1/2 inch off the rail at midspan. (The chain is fastened to a threaded bolt on to the trolley. The threaded bolt has an inner and outer nut). Hope this helps.

Dec 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

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