Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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.
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
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
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
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Posted on Jan 02, 2017
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Apr 22, 2011 | Chamberlain & Liftmaster Garage Doors
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.
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