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

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Garage door opener does not reverse after hitting obstruction

I replaced the drive gear and worm gear on a LiftMaster 1265LM garage door opener. The door will open and close properly, and the electric eye will stop the door when it's coming down and reverse it if the light beam is crossed. The door will not stop if I try and hold it while it's coming down. If it closes on a 2x4 (or a double layer of 2x4) it just clamps down on it. The force setting is barely enough to keep the door from reversing when there is no obstruction.

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  • sds02 Jan 10, 2009

    The door was released from the opener for a couple of weeks until the gears could be replaced. It always moved smoothly and it would stay in position when stopped part way down. There's no problem with binding or alignment.

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Release the door from the opener and see if door moves freely the check proper torsion by moving door up to 3-4 ft if it stays in this area torsion is properly set if not call technician to adjust torsion
if door does not move freely all the way up and down check for binding track alighnment and roller condition. the adjust closing pressure.

Posted on Jan 10, 2009

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I have a Chamberlin Garage Door opener Model 1265LM . I have replaces the gears and now the garage door will only travel about 12" and then reverse itself. Looking at it it looks as if the contacts on...


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.

Jan 31, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Is there any adjustment for the gear drive sprocket that meshes with the worm drive? my gear is not engaging any more


If your drive gear is not meshing with the worm gear it is because it is worn out. You'll need to replace it post haste. The part number is 41A2817 and is available at Sears or any good door opener service company.

Dec 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

The garage door closes and then opens up again, I have to close it several times before it secures. There are no obstructions. Is this a sensitivity problem?


More than one thing can cause this type problem.

If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is not flickering ever so slightly.

If the door reverses when it hits the floor it is a sign that the door is traveling a bit to far. The adjustment for this is on the side of the motor unit. Turn the 'down limit' in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Jul 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chain drive gear broke on my mod.1265LM. Nead price, part no., and how to replace? Thanks Dave


The drive gear part number is 41A2817 and the price for the kit is around $25.00. It comes with instructions.

Dec 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door Goes down 5 inches and then up 5 inches.


Okay here we go.

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 is 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 give it a try.

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

1 Answer

Garage door only opens 4 inches then reverses and stops


you need to replace gear when the door is fully closed. then do your tweaking.

Jun 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1265LM 1/2 HP does not open or close with remotes


is chain moving. if not, gears are shot. if moving, is trolley connected.

Dec 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Replace liftmaster 1245R drive/worm gear


I have a 1265 and took the cover off (unplug first).
There are screws securing the cover: 2 on each side at top, 2 at either end bottom.
Then I disconnected the chain.
There are 3 hex head screws securing the drive gear assembly (of course they thread from the inside out which makes taking them out a bit time consuming). Take care not to damage the circuit board or other electronic connections.
Then at the bottom of the shaft is the "limit switch assembly" that is clipped into the metal housing. Squeeze the 2 on the outside and it should swing free.
Then at the very end of the shaft there is another plastic gear. It is secured by a 3 prong plastic clip. Pull the outside clips away from the shaft while pushing the center piece back through the shaft. The gear should come off and you can now remove the gear and sprocket assembly up through the assembly.
call 800 528 2817 and order the "Gear and Sprocket Assembly".
I am waiting for the part and assume we reverse the order above to reinstall.

Oct 23, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman door opener


Did you align the chain or belt?? If not That would be the problem.

Look at the instructions that came with your gear kit. they have a detailed step by step proceedure.

If it's not the alignment it is probably a bad circuit board.

Hope this helps

Apr 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

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