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Stanley garage door manual model 3105.14

Need to replace gear sprocket bearing

Posted by Anonymous on

6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: Sears Craftsman Sprocket replacement procedure

The problem lies in the RPM sensor, most likely due to the interrupter cup assembly. The interrupter cup assembly is the black cap that runs through the RPM sensor. You may have forgotten to re-attach this piece or it is probably moving too far out when the garage sets in motion. To fix this, remove the cup assembly, unscrew the two screws on the top metal piece with a 1/8 allen wrench, push the metal piece as far in as possible and put the screws back on. This will give more room for the cup assembly to spin and be read by the RPM sensor. Hope this helps!

Posted on Jul 10, 2008

  • 118 Answers

SOURCE: 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.

Posted on Jan 30, 2009

  • 30 Answers

SOURCE: i installed a model hd900d

My best advise to you is get the brand name remote for your opener. I know it sounds like a pain but click brands are not super great because there supposed to work for many different kinda. For the most part you can call your local garage door dealer and pick one up for your opener. They may sell you a lift master brand opener which is find sears/liftmaster/chamberlain are all the same. Should only be about 35 bucks if you pick it up

Posted on Feb 10, 2009

  • 1 Answer

SOURCE: Sear 1/2 HP Garage door opener with replaced gears

The actual problem is after power on the opener, its initial state is uncertain. It may be in ready to close or ready to open state.

If the garage door is in closed position, likely the opener will still try to close it, because its initial state is uncertain. That's why you guys see it travels 2 seconds and reverse.

In order to fix this problem, after you power on the opener, do NOT hook up the chain, and do NOT mount the sprocket cap(so you can see the sprocket travel direction). While you watch carefully at the sprocket, press trigger button on remote control or ask someone press wall control button. Make sure the sprocket turns clockwise and stop. If the sprocket turns counterclockwise, press the control button again, so it will turn clockwise. Let it finish clockwise turn. At this moment, the opener is in ready to open state.

Cover sprocket cap and hook up chain. Mount door bracket and adjust. Your door must be in close position.

You are ready to go.

Posted on Mar 07, 2009

  • 37 Answers

SOURCE: I want to re-program my keyless garage door.


If you look on the back or side of the garage door opener you will see a small square red/orange button.
Push the button one time, and you will see an amber LED come on. Go to your keypad enter a four digit (of your choice) then press and hold the the enter button until the garage door opener light flashes and you hear a clicking sound. You can release the enter button and it will be reprogramed.

Posted on Apr 02, 2009

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1 Answer

Main gear in door opener striped, model #41A30339.

With stripped gear, you definitely need to look at your garage door hardware! Openers are designed to 'guide' the door up and down, not push or pull. If you have a stripped gear, most likely the opener has been working overtime.

You can check the balance of your door, by disconnecting it from the opener and raising it manually up to about knee level. If it slides down on its own, your springs are fatigued and need to be replaced by a PROFESSIONAL (DO NOT WORK ON THE SPRINGS YOURSELF!)
You can view a how-to video at

You can replace the gear and sprocket yourself if you have a few hours.. a professional will probably charge $150-$200 to replace, which- you can replace the whole opener for not too much more.

If the opener is more than 7 years old, I would recommend replacing the whole thing because all of the other parts will be worn as well, otherwise you can get away with just replacing the gear/sprocket.

Good Luck!

Mar 08, 2011 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

The chain came off my Craftsman 53920 garage door opener. How can I fix this problem?

When a chain comes off it is an indication of another problem. The bearing on the sprocket shaft is bad and lets the sprocket lean forward and the chain pops off. The part number you need is 41C4220A Gear and Sprocket Assembly. The chain can be loosened by the nuts on the trolley.

Sep 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door chain came off, i put it back on

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.

The chain normally comes off when there is a problem with the sprocket and gear assembly. The bearing goes bad and lets the shaft lean towards the door and the chain comes off. If this happens again you will need to replace that assembly which is part #41C4220A and is available at any good door service company.

Jul 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster garage door squeaks very loudly, I have luped all parts on the door but sound is coming from motor?

This is usually caused by a bad bearing on the shaft of the Gear and Sprocket Assembly. When it wears enough it will also let the chain come off the sprocket. If you look at the sprocket closely you can usually see that the shaft is leaning toward the door.

Apr 07, 2010 | 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...

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

Garage door model#139.53400

Should have a switch located that is tripped by the gear or sprocket that trips the reverse switch. May want to see what switch is not being triggered when all the way down.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

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