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

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I'm replacing the gears in my 1/2 hp craftsman chain drive garage door. I've removed the motor and have taken everything except the last washer, or collar before the gear and it appears to be stuck. I can't get it to budge at all. Is there a tool or something I'm missing to get this piece off. It appears once this comes off, the old gear will come out easily once the pin is removed.

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Sometimes the motor shaft is distorted and these parts are hard to remove. File these ridges down.

Posted on Apr 26, 2010

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Chain on garage door not moving motor working fine


Most likely the chain has come off one of the gears, or is stripped. If you look at the chain from one end to the other you should be able to see this . There should be a gear up by the motor and another close to the door. If the chain has come off, you should be able to put it back on the gears and adjust the tension so that it does not come off again. If you are handy, you can replace the gears if that is the problem. If not, you will need to have someon replace it, or if the opener is old you may need to replace the whole unit. They don't last forever.

CAUTION - Don't ever adjust the springs on the door itself. Doing this may result in injury or death! If you are unsure about a garage door, it is probably best to have someone come and fix it for you.

Feb 20, 2011 | Craftsman 34 Hp Garage Door Opener Chain...

1 Answer

My craftsman 1/2 hp garage door goes up only about


Release the door from the opener and operate the door by hand. Check the weight of the door. If it is heavy check the door springs. One could be broken. Also take another look at the gear you replaced. Did you use the lubricant on the gear? If not the gear will not last.

Mar 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't open and close properly


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.


Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 hp garage door opener, model 139.53970SRT, 8-99 Was working fine, then the plastic drive gear got stripped. I replaced the worm and drive gears and all works great mechanically, except...


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.


Nov 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My Craftsman 1/2 HP Garage Door Opener stopped working. The motor is running but chain isn't moving. The actual door goes up and down fine.


Remove the cover and take a look. I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. You can buy one at any good door service company. The part number is 41A2817 and it comes with instructions.

Nov 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door opener won't open or close door


The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.

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

1 Answer

Garage door opener motor doesn't work.


2 flashes is a safety eye issue, but you problen is most likely that the chain is not sync with the limit setting. Take the bottom off the gear and sprocket assemble and rotate center limit srew until it is in the same position as the trolley.

Jan 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

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