Chamberlain screw drive opener

If the track is a screw thread, then just latch the door anywhere along the track, and it will realign itself.
If the track is a chain-drive... then push door up until it clicks into latch.

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The gear wheel powering the chain is stripped. The cogs are usually plastic and not uncommon for them to wear or break off. Replaceable item from manufacturer.

Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. You will find it is stripped. The part number is 41A2817.

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DOES IT MOVE AT ALL OR JUST RUN??

IS THE ROPE RELEASE PULLED??

IF THE GEARS ARE STRIPPED IT WILL NORMALLY MAKE A GRAVELLY SOUND. AND THE DOOR WILL MOVE BUT NOT LIKE IT SHOUL.

TRY DISCONNECTING THE DOOR FROM THE OPENER & SEE IF THE TRAVELER MOVES NORMALLY.

There are two bolts just in front of the motor that holds the rail. Remove these and you can move the motor back enough to slide the coupler off.

Sounds like the drive gear is bad. Remove the cover and check the white nylon gear just in front of the motor. It will be obvious.

I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

Please make sure you don't have broken springs first and that the door is balanced properly. If so you can replace the "Trolly" by disconnecting the arm from the opener, undoing the opener from the bracket that mounts it to the wall. This usually takes a 1/2 in wrench. Then swing the opener out far enough to slide the trolly off and replace it with a new one. Re-connect everything then re-engage the trolly.

Make sure the rope hanging down has not been pulled. If it has the door has been disengaged from the opener. You can correct this by flipping the metal part up (that the rope is connectd to) toward the drive track. Then open or close the door using the remote. The track should grab the door again.