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Garage door opener

Garage door wouldnt close completely. i tried limit switches first and in the process the chain jump the sprocket. I put chain back on. Door was then not even close to opening fully. tried limit switches and over turned one of them. I took of cover, fixed limit switch assembly. now garage door will only run for 1 second at a time and the light flashes. It is not an obstruction sensor because i unhooked one of them to see and when one isnt connected the opener will not run at all. I unhooked chain again thinking I had the chain too tight. still just runs for 1 second and light will flash. I looked at white plastic sprocket. All seems ok....I am missing something easy!! Please help

Posted by Anonymous on

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  • Contributor
  • 25 Answers

Does the travel direction make a difference? There is typically upward / downward force adjustments. Also when it stops will it start again immediately if you activate it.

Posted on May 02, 2017

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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: Sears Garage Door Opener Problem

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 Mar 12, 2008

  • 1 Answer

SOURCE: Craftsman Garage Opener /

door will not go down unless you hold down the inside botton.

Posted on Oct 14, 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

  • 3197 Answers

SOURCE: My garage door opener won't close the garage door.

Most likely your door sensors have been bumped and are not aligned properly. Make sure they are pointed at one another and the small light on each one is lit and not blinking.

Posted on Apr 30, 2009

rulds2008
  • 3866 Answers

SOURCE: Problem with Sears Garage Door Opener

The motors is cought on something check the motor if it moves inches it will move a yard the question is the motor is it getting power? if so is it stuck on its own drive chain? Check these things you be glad you did.

Posted on May 25, 2009

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1 Answer

How do I put my chain back on a Stanley 8500 Garage door opener?


First you must make sure the sprocket on the garage door opener is spinning clockwise and reaches its limit and stops, you can easily put a pair of pliers between the #1 and #2 terminals on the garage door opener and start the sprocket spinning or just grab a remote and watch from the back of the unit (looking towards garage door ) and make sure it,s direction is clockwise, Once it stops you wanna loosen the chain enough so you can position the carriage which is connected to the chain and with your door closed send the carriage down far enough so that the carriage and the trolley both engage then all you have to do is put the chain over the sprocket and tighten up the tensioner that is located on the trolley...not to tight and not to loose is what you would want in an adjustment !....now since you already ran the sprocket in the down position your door is now ready to test ...when you press your remote or wall station the door will travel up, You have to do it this way , if you don,t ..you can damage the machine or your door ! Good luck and hope I was able to help you with your dilemma!

May 07, 2014 | Stanley Building Materials

1 Answer

Replaced a garage door opener (motor only) will only go downward a foot then back to the up position...tried the force button and the spring adjustment. why wont it work


Try this.

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.


Oct 08, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

HI, AFTER REPLACEING PLASTIC GEARS IN SAERS GARAGE DOOR O[ENER, OPENER WILL NOT GO THROUGH COMPLETE CYCLE. WHEN BUTTON PUSHED TO OPEN, OPENER GOES INTO CLOSE CYCLE AND HITS STOP BOLT. ATTEMPTED TO ADJUST...


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.


Mar 28, 2011 | 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

Garage door doesn't open and close properly


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.


Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Liftmaster tries to close instead of open door


Remove the chain from the sprocket and then run the motor until the sprocket turns clockwise and stops. With the door in the closed position and everything attached to it, replace the chain and tighten. This will get everything back into sync. You will most likely have to tweak the up and down limits a bit. Do not over tighten the chain. It should sag just a little.

Oct 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Try this: Loosen the chain enough that you can remove it from the sprocket above the motor. Now run the opener until the sprocket turns in the clockwise direction and stops. Reconnect the chain. This will get everything in sync and you will have to tweak the 'up and down limits' a bit to get it just right.

Oct 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Loosen the chain and run the opener until the sprocket runs in the counter clockwise direction and stops. Now with the door in the open position replace the chain. This will get everything back into sync but I hope you remembered where all those controls were. You need to put them back in their original positions.

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

1 Answer

Garage door opener (chain) motor runs in reverse. Trolley slides forward trying to close door, even though it is closed, instead of sliding toward motor to open door. Happened out of the blue - was


Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

May 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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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.

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