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I put a new gear and sproket on my sears lift master. It works, however when i press the garage door opener it goes one way for a few feet

Do I reset something

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Replacing the sprocket requires the drive chain be tight and the door must be re-aligned with the timing of the lift/lower sensor. check your manual. should be done with door down. I put a new gear and sproket on my sears lift mast - 10_19_2013_9_44_59_am.jpg

Btw, I’m available to help over the phone in case u need at

Posted on Oct 19, 2013


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Posted on Jan 02, 2017

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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

  • 16 Answers

SOURCE: 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.

Posted on Mar 29, 2010

  • 3197 Answers

SOURCE: My lift master security plus keyless entry pad for...

You can try programming it but first make sure the battery is good. Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to your keypad and key in any 4 digit code you like and press enter.

Posted on May 24, 2010

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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.

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