Question about Chamberlain 1/2-HP Whisper Drive Belt Drive Garage Access System

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The belt on my Chamberlain Whisper Drive dipping

The belt on my Chamberlain Whisper Drive looks loose and is "hanging" or "dipping". The opener is working fine, but it does stop from closing all the way about 1 inch from the ground. I cannot figure out a way to tighten the belt. Please help.

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Where the belt attaches to the trolley carriage which attaches to the door there is a black adjustment nut with a spring on it. Tighten it up more by turning it clockwise until the belt tightens up. The belt will droop a little when the door is all the way shut normally but should not during operation. If you tighten it up too much the belt will slap on the rail during operation. Make sure the spring is set on the adjustment screw too. This holds the belt tight over time. Thanks BB

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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could be that the remote operation or cycle operation needs reprogramming as it indicates that the program has a corruption in it and the action is lost by that corruption
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You will need to research your particular model--there's probably a model number listed on the opener.
here is a link to the various owner manuals available on line:

http://chamberlain.custhelp.com/#s=eyJzZiI6eyIxNzYiOnsiZmlsdGVycyI6eyJub190cnVuY2F0ZSI6MCwicGFnZSI6MSwic2VhcmNoVHlwZSI6eyJmaWx0ZXJzIjp7ImRhdGEiOjV9fSwia2V5d29yZCI6eyJmaWx0ZXJzIjp7ImRhdGEiOiJsb29zZSBkcml2ZSBiZWx0In19LCJwIjp7ImZpbHRlcnMiOnsiZGF0YSI6eyIwIjpbXX19fSwiYyI6eyJmaWx0ZXJzIjp7ImRhdGEiOnsiMCI6W119fX0sInNvcnRfYXJncyI6eyJmaWx0ZXJzIjp7ImRhdGEiOnsiY29sX2lkIjotMSwic29ydF9kaXJlY3Rpb24iOjF9fX19fX0sImMiOjJ9

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Probably just a burned-out light bulb. The "click" you hear is the relay closing. Replace the bulb. *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid Land Camera"The problem can always be solved with the materials in the room." -My college Physics Lab Professor

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DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

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You could always use "Belt Ease" from an Auto Parts store. It's made for squeeky belts.
-Lonnie

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