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

1 Answer

Liftmaster door won't reverse

After installing new worm gear, etc. motor works fine in clockwise direction, but does not reverse. RPM sensor is on and there is no play in the gear. The contact on the limit switch assembly is reached and any further attempts to get the motor to work result in clicks only.

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  • marty metzger May 11, 2010

    where is trolley assembly. up against bolt?

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  • Expert
  • 61 Answers

Check the relay in ur control board or replace it
check that the plastic cap in the rpm sensors doesnt stuck with any of them
check continuity in both limit switches..
check the capacitor terminals or the integrity of it

Posted on Mar 10, 2009

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  • 1 Answer

SOURCE: Replace liftmaster 1245R drive/worm gear

Look at another web re how to replace a stripped gear of a garage door opener. Look at "galtrying" concerns. I have posted a quote on how I did mine with motor out. Easy as a piece of cake.

Posted on Jan 09, 2009

swolfinor
  • 504 Answers

SOURCE: replaced sprocket and worm gear on chamberlain 1/2 opener

CHECK THE RPM SENSOR A LITTLE CUP ON THE MOTOR SHAFT. IF IT IS NOT INSTALLED SO THAT IT INTERUPTS THE SENSOR THE OPENER WILL GO 6-8 INCHES AND STOP.(AND BLINK 5 TIMES)

ONCE YOU GET THE LITTLE WHITE CUP PROPERLY ALIGNED YOU WILL NEED TO RESET YOUR TRAVEL LIMITS AND TEST YOUR REVERSE / SENSITIVITY SETTINGS.

HOPE THIS HELPS

Posted on May 28, 2010

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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1 Answer

After worm gear repair, the door which is in the closed position ,on activating remote, wants to go down. Then it pauses and reverses a quarter turn. Even disconnected from door it still wants to go down....


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

Jan 07, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Garage door opener problem bench testing motor goes 1 direction then reverses instantly,newly replaced plastic gears


There are a couple things that can cause this. One is your door sensors are not connected to the opener and the other is:

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

Jun 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1265 won't motor more than a foot in the down


Check, The black interruptor cup. See if it has powder from gear on it , Remove particles, And run a Q-Tip between the two little towers on the RPM sensor, Which the interruptor cup rotates into to count rpm cycles.

Dec 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

I just changed out the gear and sproket assembly with no problem. The nylon gear was badly worn. Now, with or without the door engaged in the trolley, when I push the door opener, the motor runs in one...


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.


Dec 02, 2009 | 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

Have new logic board and gears. No matter where door is it will go down a foot. reverse and go down a foot. Can't seem to adjust


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the rpm sensor is plugged in. If neither of these are the issue then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

Jul 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener will not work after gear replacement


check the end shaft platic cap is installed and runs freely between the rpm sensors.. that might be ur problem..

Mar 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

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