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

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Fairley new opener but it unhooks from the Carriage Assembly once every 5th time

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  • asmans Mar 06, 2009

    Nice! I hadn't thought of that. Thanks for taking time to help out the world!

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Sounds like the carriage is coming of the connector and that usually happens when the cariage travels to far and bumps the power head of the machine that split second **** is enough to unhook it fro the carriage because the next motion would be coming down and probably without the door attached to the connector , and by connector i mean the other half of the carriage Remedie ;; adjust the open door travel to not come up as high let it stop about 2 inches before the machine and that should fix-it , Thank you and hopefully i was able to help you please leave a good rating if i was able to help Sincerely Glenn Mayer ....mayer overhead door co,

Posted on Mar 05, 2009

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1 Answer

Stuck in up position against unit protector bolt . . . will not move with either control . . . unit only clicks . . . appears to have opened too far compared to other doors?


Der Randy,
If you want to learn to be a garage-door-opener-mechanic, now is the time to start.
I have done a dozen of these like this.
You start by unhooking the garage door from the track, by pulling on the emergency cord that is hooked to the connector, which releases the door from the opener.
( Now, you can work it by hand, until the opener is fixed.
Remember not to let it latch again until the opener is fixed. You must watch it.)
Then carefully take the stopper bolt out of the track, and if it is highly pressurized, watch out that it does not fly out and hit you in the face.
Nope, you should be free to adjust the chain travel, electrically.
There are two adjusting screws on the opener motor that will change where the door stops and starts.
You should be able to adjust these now to get the door to open and close properly.
Once it is working properly, attach the door to the opener assembly. God bless your efforts.

May 13, 2016 | Garage Doors

1 Answer

Carriage assembly is broken. need a new one


The replacement carriage can be ordered either through a retailer that carries this brand or from the manufacturers or a distributors website. If you have the owners manual it may list the part number otherwise you can look it up using the model number

Jan 11, 2014 | Genie Company Garage Door Parts Genie Gwkp...

2 Answers

I have a Sears Opener that suddenly stopped opening the garage door more then about 3 feet. Then when I would press the button again, the opener ran all the way down the rail till the carriage hits the...


You will need to loosen the chain enough to take the tension off and then run the motor until the door closes. While the door is closed turn the up limit control 2 full turns in the opposite direction of the arrow printed on the cover. Now tighten the chain. It sounds like you have additional problems. Check the door springs and then remove the cover and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped. You also may have been turning the limit controls the wrong direction.

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

1 Answer

The doo seems to be stuck down...like the upper


On the side of the motor unit you will find the 'down limit' adjustment. Turn this in the opposite direction of the arrow printed on the cover. It may help if you remove the cover and you can see the limit adjustment assembly. It will help you understand the problem.

Dec 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Door not working, motor seems fine


I have similar jerkiness problem and have gone through all the nine yards of possible causes. The motor stops at random position and at random time. Even when I unhook the door from the carriage, it still showed this symptom. It started when I had one torsion spring broken. I replaced both torsion springs and adjusted for weight balance. Make sure the two cables windup properly along the thread of the pulley; Checked the photo eye sensors; checked/test capacitor; cleaned rpm sensor; adjusted all possible force settings; make sure limit switch at sound; re-programmed my remote just to check if the logic board somehow still work on this side and it did;
One important observation I have is that when I adjusted the carriage chain, I've noticed that the opener unit turns off and on as if there's a loose connection/contact. This I pursued more. The more I investigate, I spotted a "tiny" spark on one logic board soldering at the transformer footing as I **** the back panel (where the board is mounted) back and forth to simulate the on/off due to the loose contact observed earlier. This one solves everything! All I had to do is take the logic board out and re-solder that failed connection and Hooray - it fixed the problem!
Hope this helps someone with similar issues,

Viewful
Canton, Mi

Apr 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My liftmaster garage opener just clicks when trying to open''


You probably have the lock enguaged. Press the lock button on the wall control for four seconds to turn lock off

Mar 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

How do I reconnect the carriage?


with the power back on .. push the remote control.. and engage the garage door troley with the carriage

Dec 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

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