Sears garage door opener, chain adjustment

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[PDF]GARAGE DOOR OPENER Model 3265 1/2 HP ... - LiftMaster

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Craftsman 1/2 HP Chain Drive Garage Door Opener - Sears

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Craftsman1/2 hp Chain Drive Garage Door Opener Opens by Remote, Inside and from Car Enjoy a great end to every day by ... Owners manual - English (Warranty).

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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.

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.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.

Your drive gear must be stripped. Remove the cover and you will most likely find lots of what looks like white sawdust and a stripped gear. It is white nylon and is just in front of the motor. The part number is 41A2817 if you want to replace it and it comes with instructions. Available at any good door opener service company.

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

You should also loosen the chain enough that you can remove it from the sprocket above the motor. Now with the door closed and everything else attached run the motor until it runs clockwise and stops. Replace and tighten the chain. Some adjusting of the up and down limits will be required.

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?

According to Sears your model number is bad. Double check the number and they will have the owners manual with complete installation instructions.

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.

Refer to your owners manual to adjust the travel limits to stop the door opening too high