i connected my garage opener to the door itself but every time i try to close it always comes back up. The sensors are working fine and there is no cause for it to that i but i do notice that the top of my garage door seems to crack and is breaking the top section of the door every time i try to open or close it with the opener.

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Seller: Amazon

Model: LIFTMASTER 41a2817

The Liftmaster Gear Kit 41a2817 is compatible with Chamberlain Liftmaster Sears Craftsman units manufactured 1984-current. The manufacture date can be found on the motor head. Important note: use entire tube of lubrication during the installation of the gears or the drive gear will shred quickly, possibly within a couple of days.

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My garage door dosent lock right now and I dont have a key to it,If i get a automatic garage door opener will it lock by itself when it closes.

We just moved into a a new home, and along with changing the door locks, I want to reprogram the garage opener unit so if the previous owners still have a remote opener, they won’t be able to come back to the property and open our garage. Is this possible? Or do I need to buy a whole new unit? (this is not a question on how to program the actual remote) Thanks!
Thank you everyone – the brand is a Liftmaster professional, but don’t know the model number, not over there now. It’s connected by metal bars to the garage.