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

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Garage door opens with a **** up rather than a smooth opening as if it's stuck. I have applied WD40 to no avail. What to do?

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Release the opener from the door and manually operate the door. Sounds like you may have a broken spring.

Posted on May 11, 2009

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Liftmaster GDO goes up 1/2 way and stops,springs are fine.


The Liftmaster openers have 4 movement switches, a )opening and b) closing limit and c) opening and d) closing force. First check the door for smooth operation by opening the door by hand (disconnect from the opener with the release cord). Any binding should be felt this way. It is possible for a binding hinge, roller or torsion springs to add too much drag and cause the force switch to shut off the motor. Hinges, roller shafts and torsion springs should be lubricated at least annually with a non oily spray (silicone or teflon spray). Not WD-40 or 3-in-1! A light band of lube should be applied to the torsion spring coils. If the door can be operated smoothly by hand, then adjust the closing force switch 1/4 turn at a time. This is a safety device do not use it to overcome another problem!

Aug 15, 2014 | liftmaster Garage Door 1/2 Hp

6 Answers

I have a Craftman Garage Door Opener Mod#139.53650SRT. It closes completely then goes back up. I replaced the sensors @ the sides of the door to no avail. I have tried to adjust the up and down on the side...


I agree with the closing resistance may be set incorrectly, all openers have a safety feature that senses if something is keeping the door from closing, this is back force, you set the sensitivity at the back of the opener motor control, it is a little dial, reduce the setting just enough to stop the door from kicking back open when it closes, I had this very same problem with my craftsman and this adjustment fixed it.

Oct 08, 2008 | Sears Craftsman LiftMaster Chamberlain...

Tip

Inspecting a garage door opener.


<p>Use the pull cord and disconnect the opener from the garage door. <br /> <p>Operate the opener and let the carrier slide back away from the door. <br /> <p>Is the carrier moving smoothly when disconnected?<br /> <p>Operate the opener into the down position, does it run smoothly? <br /> <p>Next, lift the door by hand from the bottom to the top. Is it moving smoothly?<br /> <p>Run the door down, ensuring that it moves smoothly. If not, lubricate the axles of all the rollers on both sides of the door.<br /> <p>Check the cable pulleys at the top sides of the door channel, lubricate them as well. <br /> <p>Are the two cables in all four of the pulley grooves?<br /> <p>Are the cables hooked properly to the bottom of the door?<br /> <p>Now, connect the opener to the door and try it.<br /> <p>After checking those things, there is an "up force" and a "down force" adjustment on the opener, try increasing the whichever is needed by by turning the adjustment in the direction of MORE force.

on Jan 09, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door opener


With the door down ensure the wire rope on each side are exactly the same length.

Apr 30, 2012 | Craftsman 34 Hp Garage Door Opener Chain...

2 Answers

My garage door opener will start to close then stop and go back to the open position. If I put pressure on the door as it is closing sometimes it will close all the way and sometimes it will return to the...


Try cleaning the door tracks and rollers as if they are sticking the motor will reverse as a safety function. Use WD40 and wipe clean then apply some spray grease.

Feb 28, 2011 | Vacuums

1 Answer

My garage door wont open or close the moter makes a funny noise like its stuck i checked the sides checked the strap everything seems fine


Take the cover off the motor unit and check the drive gear. It is white nylon and will be very obvious if it is stripped which it most likely is. The part number is 41A2817 and is available at any good door opener service company or Sears. It comes with instructions.

Dec 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

When I activate the garage door moves up about 2 feet then just continues to go up and down as if stuck but there does not appear to be an obstruction


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Gary

Dec 19, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

GARAGE DOOR WANT CLOSE, USING CLOSER WILL MOVE A LITTLE BUT LIGHT FLASHES, SENSORS SEEM TO BE WORKING


I recommend this to everyone with garage door opener problems:
Use the pull cord and disconnect the opener from the door.
Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected?
Next, lift the door by hand from the bottom to the top. Is it moving smoothly?
If not, lubricate the hubs of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well.
Are all cables in all the pulleys, there are 4.

Dec 07, 2010 | liftmaster Chamberlain Garage Door Opener...

2 Answers

My Chamberlain garage door wont stay closed. It


well the there are lots of possabilities but the most likly one is that there are shadows or pieces of debris that are on a laser detector or the chain that pulls the garage door is being heated while it is frozen which could change the signal on the closer. or you need a theremal cover on ur opperator system for the opening and closing on the door.... google always helps

Dec 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener


IF IT HITS THE FLOOR AND GOES BACK UP. YOU NEED TO ADJUST THE DOWN LIMIT.

IF IT GOES BACK UP BEFORE HITTING THE FLOOR YOU NEED TO ADJUST THE SENSITIVITY OR THE SAFETY EYES.

TRY THE DOOR MANUALLY AND MAKE SURE IT WORKS SMOOTHLY.

Sep 30, 2008 | Sears Craftsman LiftMaster Chamberlain...

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