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Question about Chamberlain 3/4-HP Power Drive Chain Drive Garage Access System

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We just replaced the "trolley" component of the opener, now when we open the garage door it opens about a foot, then stops like its hung on something... it will go back down. If i help it pass the hun

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Check your manual and re-program the up/stop and down/stop position. Also make sure the new trolly is in it's proper position.(in the closed position) Hope this helps

Posted on Oct 06, 2012

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Mike

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SOURCE: My garage door attempts to close then stops and auto reverses. If I pull the release and manually push the door down halfway then press the opener, the trolley will make a full pass without any auto r

Look at the sensitivity adjustment, your description sounds like it is set too sensitive. This is the close sensor.

Posted on Apr 16, 2012

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Garage door opener trolley keeps shearing off. Had it replaced a year ago, and I noticed that it is making a grinding noise and I can see it is halfway sheared off again.
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Oct 08, 2015 • Sears Craftsman LiftMaster Chamberlain...
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Mar 06, 2014 • Sears Craftsman LiftMaster Chamberlain...
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1/2 horse garage door opener doesn,t open all the way. I need about a foot more lift. The tried a trolley stops before the stop limit..Therre is no interference. I Tried adjusting the up limit to no...
You said you adjusted the up limit already. Is it adjusted as far as possible? Usually the screw will become harder to turn. You mention a new door and spring but is the opener the same? My guess is you have a new opener as well and it is out of sync with the trolley. Try turning the up limit back and see if the trolley will stop shorter. If it does, loosen the chain or belt so that you can remove if from the opener's drive gear. Bring the trolley to your stop limit and put the chain/belt back on the gear. Adjust the chain/gear tension and try door operation again. If it was a sync problem, the door should close closer to your limit. Adjust up and down travel as necessary to fine tune it. This worked for me so good luck.
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The adjustment for the chain is on the trolley. That is the part the chain and the door are connected to. Your chain is sagging entirely too much. Have you done any other work to this opener?
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Oct 30, 2009 • Sears Craftsman LiftMaster Chamberlain...
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You can adjust the length of the arm between the trolley and door so that it is in a vertical position when the door is closed. This will prevent your problem.
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Oct 03, 2009 • Sears Craftsman LiftMaster Chamberlain...
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Craftsman garage door opener 1/2 hp will not open door
It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.
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Aug 16, 2009 • Sears Craftsman LiftMaster Chamberlain...
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Garage door opens 1 foot, then stops.
It sure sounds like you have a broken door spring. While you are at it remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Might be stripped and unable to take the weight of the door.
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Jun 24, 2009 • Sears Craftsman LiftMaster Chamberlain...
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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.
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May 23, 2009 • Sears Craftsman LiftMaster Chamberlain...
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Garage door opener will not work after gear replacement
From your description it sounds like you forgot to plug in the RPM sensor.
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Mar 16, 2009 • Sears Craftsman LiftMaster Chamberlain...
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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..
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Garage door opener trolley keeps shearing off. Had it replaced a year ago, and I noticed that it is making a grinding noise and I can see it is halfway sheared off again.

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