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

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How do I tighten sagging garage door chain?

The chain on my liftmaster garage door opener is sagging. When I press the button to open or close the door, it just hums. How do I tighten the chain?

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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.

Posted on Jul 13, 2010

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1 Answer

My 1/3 hp craftsmen door opener just hums when you hit the wall button or remotes in the car. I replaced the starter motor capacitor and nothing changed any ideas?


Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain until the tension is removed from the trolley. Run the motor until the door is closed. While the door is closed locate the 'up limit' adjustment on the side of the motor unit and turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

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Garage door has a dirty grease mark down middle of door as if chain or something is rubbing on it.as it opens. When I watch it opens it appears that nothing is even coming close to door as it opens and...


When the door is opening the chain on one side of the rail is pulled tight and the opposite side sags. It is just the opposite when the door is closing. It could be the sagging side is rubbing against the door but it seems you would have seen this. Also the chain shouldn't have grease on it. Just a light coat of lubricant from the factory. You might try tightening the chain just a tad.

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

1 Answer

When I hit the button to close the door, the unit hums for a little while then quits. Is there something I can do?


Check to see if the trolley is jammed against the bolt just in front of the motor unit. If it is you can either remove the bolt or loosen the chain just a bit to relieve the strain on 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 complete turns in the opposite direction of the arrow printed on the cover. Replace the bolt or tighten the chain.

Sep 15, 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...

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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.

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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

Garage door chain is sagging


If the chain is adjusted properly the chain will sag slightly on one side when the door is closed and on the other side when it is open. It should not sag enough that it is dragging on the T-rail. You can adjust it at the trolley. If you over tighten it you will hear a clicking sound when the opener opens or closes.

Jul 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlin Liftmaster 2245 won't open or close, just hums


If your door is stuck in the open position you need to see if the trolley is jammed against the bolt just in front of the motor unit. If it is, loosen the chain enough to remove the tension from the trolley. Run the motor until the door closes and then locate the 'up limit' on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

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