Garage door chain is sagging

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Liftmaster Gear And Sprocket Kit 41c4220a Chamberlain ...

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Searsmore info. + -. Chamberlain LiftMaster 41C4220A Gear & Sprocket Assembly Kit. $31.40 ... Chamberlain Sears Craftsman Liftmaster 41A2817 Gear Kit. $27.65 ...

craftsman garage door openers are made by chamberlain.. Give them a call on their 800 number with your craftsman model number and they will help you

Pull down on the manual release rope. It may be hard to pull.

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.

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.

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.

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.

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?

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.

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