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

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Garage door chain is sagging

Sears craftsman garage door - it opened but when we closed the door the chain is now sagging.

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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.

Posted on Jul 28, 2009

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I just installed a Sears Craftsman 1/2 HP Garage Door opener. As I was doing the adjustment to keep the door closed, it closed too tight. I disengaged and confirmed the door arm was set wrong so I fixed...


Use the emergency release handle to release the door. Run the opener to the open position until it stops. Close the door until it stops. Now re engage the the door.

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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.

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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...

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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

Sears Craftsman Garage door opener does not open or close


The drive gear is most likely stripped. It is a white nylon gear just in front of the motor. The parts number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.

Jun 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener and the chain came off trac


YES - YOU ALSO NEED TO BE SURE IT IS IN THE CORRECT POSITION WHEN YOU REINSTALL IT.

MOVE THE TRAVELER / TROLLEY TO THE CLOSED POSITION RUN THE OPENER TO THE CLOSED POSITION. LOOSEN CHAIN AND REINSTALL.

TIGTHEN CHAIN ONLY ENOUGH TO KEEP IT FROM SAGGING BELOW THE RAIL. (TOO TIGHT WILL RUIN THE BUSHINGS ON THE DRIVE).

NOTE; THE BUSHINGS MAY BE BAD THIS WOULD CAUSE THE CHAIN TO COME OFF OR SAG TOO FAR, LOOK FOR EXCESSIVE PLAY IN THE BUSHING UNDER THE CHAIN SPROCKET.

IF IT IS BAD A KIT IS AVAILABLE TO REPAIR.

HOPE THIS HELPS

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

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