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

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How to tighten the chain on a liftmaster - Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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There are adjusting nuts on the trolley. The chain should have a little slack. Do not overtighten. One side will always hang a little lower than the other. The lowest side should be about 1/4 inch above the rail.

Posted on Jun 07, 2010

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I have a Acess Master 1/3 HP garage door opener. i need to tighten the chain, can anyone tell me how this is done?


The adjustment for the chain is done at the back side of the trolley. A 1/2 inch open end wrench will do the trick.

Jan 19, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chain is too loose. how tight should it be?


Chain should be approximately 1/4 inch above the bottom of the rail. If you over tighten the chain will make a clicking noise when the opener runs. This is not good.

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

1 Answer

I just installed a craftsman garage door opener and the chain is sagging on one side and super tight on the other. When opening the door, the chain sags on both sides. I have tried tightening the nuts on...


When the door is opening the chain will be tight on one side and slack on the other. When it is closing it will be just the opposite. It is important that you do not over tighten the chain. I suppose the wrong chain could be shipped with the opener but it wouldn't be common.

Jul 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do I tighten sagging garage door chain?


I think you have more problems than just a sagging chain. It is most likely sagging because the bronze bushing at the gear and sprocket assembly is bad. It lets the sprocket lean forward and loosens the chain. You will also need to remove the cover from the motor unit and check the drive gear. It is a white gear just in front of the motor and is most likely stripped.

Jul 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Liftmaster Garage Door Won't Close


Sounds like maybe the door traveled too far and the trolley has jammed against the bolt just in front of the motor. If so, loosen the chain enough to take the tension off the chain and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit and turn it 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

1 Answer

Stanley garage door opener chain screw adjustment


THE ADJUSTMENT IS SUPPOSED TO HAVE A 2ND NUT THE TWO TIGHTEN AGAINST EACH OTHER AND ACT LIKE A LOCK

Apr 01, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Door won't lift when push button. Makes loud


if this is a chain drive,is the chain so loose that the chain is jumping on the sprocket? this would cause a lot of noise. if this is the problem just tighten the chain.

Nov 25, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My i/2 hp crafstman chain drive opener stops about a foot from the floor i got it up and noticed the chain was sagging about a foot below the bar how dow I tighten the chain


The adjustment for the chain is on the trolley. That is the part the chain and the door are connected to. Your chain is sagging entirely too much. Have you done any other work to this opener?

Oct 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do I adjust the chain on Chamberlin 1/3hp


The chain adjustment is on the trolley. Don't over tighten. Some slack is necessary.

Sep 27, 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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