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

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I replaced the two plastic gears (with gear kit) in my Liftmaster garage door opener. Everything was replaced as it was and no adjustments. Now the opener only travels a very short distance (<12 inches) down and then automaticaly returns. With the door in the open position, I removed the chain from the sprocket and turned on to allow the sproct to move it entirely counterclockwise position. But chain back on and it still only moves the same short distance. Help.

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Ok first u always want to make the opener is in the down position sbout 1' back from the nose piece . Check the travel screws they are white plastic ones make sure they are snapped in and the contacts are ok not bent ,burnt or broken off on the craddle its labeled up and down . Never hook the opener to the door rightaway .so unplug it take the chain back off plug it in with cover off run it to the down position Unplug it hook the chain back up 12" back from the nose

Posted on May 16, 2014

  • joe one May 16, 2014

    Ok first u always want to make the opener is in the down position sbout 1' back from the nose piece . Check the travel screws they are white plastic ones make sure they are snapped in and the contacts are ok not bent ,burnt or broken off on the craddle its labeled up and down . Never hook the opener to the door rightaway .so unplug it take the chain back off plug it in with cover off run it to the down position Unplug it hook the chain back up 12" back from the nose

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Check the white female plug that goes to the RPM sensor board. Its like pins. Also check the black "wheel" that spins on the same sensor board. Sometimes the wheel gets knocked out a little when you rebuild the gear and sprocket assy.

Posted on May 08, 2014

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Check that your RPM board didn't come unplugged ..it mounts under the black wheel by the worm gear

Posted on May 07, 2014

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With my door closed, i push door button to open and the chain and opener continues inthe closing mode. any help?


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

Jan 10, 2016 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How much is gear kit for 1/2 #41A2817?


Gear kits can be purchased for chain drive machines from any of these 3 brand names ...Liftmaster/sears craftsman /chamberlain / All 3 of these brand names are manufactured by Liftmaster the worlds largest maker of garage door openers and related parts ! You can purchase a gear kit on ebay for around $30 or less depending on the seller ! If you go to garage door parts sites it will be slightly higher so your best bet is EBAY , The gear kit only requires the main gear and sprocket housing that attaches with 3 screws , just remember after the gear is installed that you run the motor co that the trolley starts in the door down position otherwise you risk having the trolley smack into the opener , this is crucial for any travel adjustments that are made later! Hope this helps you ,sincerely Glenn

Feb 04, 2015 | liftmaster Garage Door 1/2 Hp

1 Answer

I replaced the gears in my liftmaster garage door opener . The plate won't travel to catch the door, it only moves about 4 or 5 inches.This is in the open and close position . I have checked the safety...


Make sure that your chain isn't adjusted too tightly, and that you've adjusted the force settings on your opener. There is also a little black plastic wheel with slots on it that must be aligned with a small control board with a black plastic U-shaped piece. If everything I've described is correct, then you should call a door serviceman to inspect the opener.

Aug 29, 2013 | Sears Craftsman LiftMaster Chamberlain...

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I have a Liftmaster formula1 garage door operator, belt drive. It just ate the main plastic drive gear. This operator has been in operation for 15 years with no problems. Any ideas?


JUST NORMAL WEAR AND TEAR. REPLACE THE GEAR KIT AND YOU SHOULD GET MANY MORE

YEARS OF SERVICE.



Unplug the unit - take of the cover - you will find white shavings inside - these confirm the Get the gear AND sprocket kit.


It

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1 Answer

Need to change plastic 3" diameter gear that is driven by the worm drive gear


The part number for the gear kit is 41A2817. It comes with instructions and is available at any good door opener service company.

Dec 29, 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 belt driven door opener made in 1995


You need to adjust the limit settings. There are two white screws on the side of the opener. One adjusts the down limit and the other adjusts the up limit. One full turn adjusts the door approx two inches, so turn the screws in small increments and see how much more to adjust.

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

3 Answers

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you have a stripped gear on your opener. Replace gear and sprocket kit

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

2 Answers

I need a repair guide for a LiftMaster garage door opener.


complete gear/bearing kit $30, comes with complete instructions.

Nov 20, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chain gear is stripped//garage door opener //lift master 1/3 hp


I made a webpage that includes the instructions that come with the gear kit. How to replace the gears, reset the travel settings, lots of pictures, part lists and numbers.
http://tinyurl.com/gearfix
cb953ba.jpg

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

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