Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
How to repair garage door chain drive.
How to fix a chain drive garage door when it won t open.
Documenting how i repaired the garage door.
Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor.
Located along the rail the chain an.
You should have 1 2 inch of play in the chain.
Garage door opener is very strong and seldom does the chain actually break.
In this case the cable can be replaced fixing the problem.
For many generations people rely on this type of door opener not only because it is easy to use but also because it is cheap and can easily be repaired when broken.
This video from sears partsdirect shows how to replace the chain and cable assembly on a chain drive garage door opener.
Pull the chain toward the garage door and hold it in position.
Press down on the chain with your finger.
Thread the nut s facing the door clockwise until it meets the bracket then release the chain.
The chain got loose and popped off the gear.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
I am not a professional.