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

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How do I disconnect my opener and manually open my garage door?

I have a 1/2 HP chain GDO and it quit working in the open position. I need to close my garage door manually. I would like to know how this is done.

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  • cjarboe11 Feb 11, 2009

    I pulled the latch and was able to close the door. Thanks for your helpful suggestion. CJ

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Check up by the motor. There should be a latch you can pull down that will disengage the chain from the door. After that, just pull the door up or down as needed.

Posted on Feb 11, 2009

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I have two craftsman door openers. They work great with pushbutton on wall, open and close ok. The door opens fine with remotes ( one handheld other homelink in car ) but will not close with remote. It...


If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are both on and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Dec 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door will only open a little over 5 feet


Close the door and release the GDO from the door by pulling the release handle. Operate the machine without the door attached. Does the trolley go to the full open position?? If so check the door.
Operate the door manually. If it is very heavy and wants to close the door is out of balance.
If the door doesn't work correctly, the GDO will not work. Regardless of the type of door, it should be easy to open manually. Unballanced doors are dangerous. The counterbalance springs may be broken or just require adjusting. The door jamming or hitting an obstruction is another thing to consider. If the door hits an object going up, it will stop, going down it should reverse.
If the door is good, and the machine runs full cycle without the door attached, reattach the door and adjust the "Up Force" adjustment on the end of the machine with the wiring. With proper operating equipment (door, GDO), it should be no more than 6 O'clock. Any higher than that, and the door likely requires servicing.

Dec 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain chain gdo. goes all the way up until it hits gdo box and gets stuck. unstick it and it works for awhile then it happens again


Unstick it and close the door. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Should be good to go.

Oct 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My 20 yr. old Craftsman 1/2HP chain drive GDO (139.18590) will click and hum for a second but the door doesn't move when I press a remote or wall console. The door moves freely manually and I checked the...


If your door is stuck in the open position the trolley is most likely jammed against the bolt just in front of the motor unit. You should be able to loosen the chain enough that it releases the pressure on the trolley and then close the door. While the door is closed, locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover and then tighten the chain.

Feb 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

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My older Craftsman garage door opener comes down about 6" & then goes back up. I just replaced all the rollers o& the opener worked fine. Then I tightened the chain on the opener & it worked ok...


If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

Jan 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

1/2 HP Craftsman Garage Door Opener works but lights don't


I think you are saying that normal incandescent bulbs do not work. If that is correct you should unplug the unit and using a small screwdriver reach into the socket and pull out slightly on the center contact.

Aug 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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The motor will need rewinding, and the condensor will probably need replacing.
That should do it:)

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1 Answer

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Hi there, when the problem first started was the door being used frequently? If your GDO was used quite a few time's in a short period of time the "overload" may have triped. The makers of all GDO's now adays install an overload witch is an electrical safety device protecting the motor. This prevents over heating in turn burning up the motor. To rectify unplug for 15-20 mins. If you have Model number 1270 turn to pg. 7 in owners manuel. Insure all door locks are free. Insure power to electrical outlets by pluging desk lamp in same out as GDO. what model do you have?

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