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Garage door opener motor just hums for about 2 sec will not open or close the door. exchanged the rail and trolley due to trolley would come detached. Now the motor just hums & not turning?

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Could be stripped gears internally. Take cover off and look. It will be obvious.

Posted on Mar 31, 2015

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Garage door opened fine but now when I try to close it, all I hear is a buzzing sound for 3 sec., light comes on but door won't go down.


Your trolley may be jammed against the bolt just in front of the motor unit. If so, loosen the chain enough to relieve the strain on the chain and then run the opener until the door is closed. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Jul 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman 1/2 HP Garage Door Opener, Model 139.18076 or thereabouts. One day the door went up and it didn't come back down without me detaching and closing it manually. The motor hums/clicks...


Check to see if the trolley is jammed against the bolt just in front of the motor housing. If it is, loosen the chain enough to take the stress off and then run the opener until the door closes. While the door is closed locate the 'down limit' on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Mar 30, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My 1/3 hp craftsmen door opener just hums when you hit the wall button or remotes in the car. I replaced the starter motor capacitor and nothing changed any ideas?


Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain until the tension is removed from the trolley. Run the motor until the door is closed. While the door is closed locate the 'up limit' adjustment on the side of the motor unit and turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Dec 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have Chamberlain 1160 Lift-Master farage opener. Currently the trolley stuck in the upped position agains the bolt and does not go back. When I try to close the door, the motor is humming twice, then...


Loosen the chain to remove the strain from it and run the motor until the door closes. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Now you can tighten the chain.

Oct 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Liftmaster GDO makes a clicking sound and won't open


See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.

Jan 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Track rail bends when closing the door


I think you need to take the cover off the motor unit and watch the limit switch assembly in operation. Takes only a few seconds to see how it works and see if it is damaged in some way. You need to turn the down limit adjustment in the opposite direction of the arrow printed on the cover to stop the door sooner. I think the down force adjustment on the rear of the motor unit is out of adjustment also. This adjustment affects the safety of the opener and should only be adjusted high enough to consistently close the door.

Oct 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlin Liftmaster 2245 won't open or close, just hums


If your door is stuck in the open position you need to see if the trolley is jammed against the bolt just in front of the motor unit. If it is, loosen the chain enough to remove the tension from the trolley. Run the motor until the door closes and then locate the 'up limit' on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Apr 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door won't open or close


is trolley jammed against stop bolt. take out to release tension on chain. may be bad circuit board. how old is unit.

Jan 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

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