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

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Garage door opener problem

I just replaced the drive gears on my craftsman garage door opener.The instructions direct you to let the sprocket complete a clockwise rotation before reinstalling the drive chain. Every time I press the button, the sprocket begins to turn clockwise, then quickly reverses. It does not make it to the bottom limit switch before reversing. I have increased the lift pressure to max setting but this does not help.

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  • poppy2four Mar 02, 2008

    I just did the same thing yesterday and have the exact same issue. I've disonnected my limits switches so it can't be that. I've removed the chain and the motor runs about 2 -3 seconds and then reverses. The pressure dials are worthless in this case. I have a feeling it must be a circuit board but

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If the safety eyes are not connected you need to ho;d the button down until it reaches the close linit.

Posted on May 30, 2010

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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

The chain sprocket does not move but the moter runs


I think you need to replace the drive gear. look inside the main housing. if you see white plastic shavings that would confirm the gears are stripped.

kits are available for under $25.00. don't buy the one with just the gears, get the new shaft sprocket etc.

Not a difficult repair. However, be sure to follow the instructions carefully. the position of the chain & sprocket when you put it back together do matter.

Good Luck

Steve

Mar 02, 2015 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

The sprocket snaped as garagedoor was comming down how to repair it


The sprocket and gear assembly is available at any good door service company. The part number is 41C4220A and comes with instructions.

Mar 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

I can hear the motor "working" but the chain is not moving and so door will not open?


Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and I'm sure you will find it is stripped. The part number is 41A2817 and is available at any door opener service company. It comes with instructions.

Mar 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Door Opener Model# 13953919 not working.


Yes replace the entire assembly. The part number is 41C4220A Sprocket and Gear Assembly and is available at Sears or any good door opener service company. It comes with instructions.

Jun 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Just replaced drive gear, door will move in open direction only


bet your working of a lifmaster chamberland or sears craftsman there all the same thing listen you have to limit controls on left side of operator if you looking at it from behind check the limit control in the middle of those to with cover off motor, also make sure both photo eyes are lit up soilid...

Apr 03, 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...

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