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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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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