Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
Garage door opener chain repair.
To do this put some lubricant on a piece of rag this use the rag to wipe the chain.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
I am not a professional.
Place the chain around the front sprocket on the rail.
If you are not confident in your ability to diagnose the problem call a local garage door service company.
If your chain is badly corroded you may need to remove the chain from the carriage assembly and soak it in lubricant for a few hours.
Move the ladder to the opener motor and place the chain around the sprocket on top of the motor unit.
Sprocket is at the end of the opener rail closest to the garage door opening.
The chain wraps around this sprocket as well as the gear and sprocket at the motor.
Move the ladder back under the carriage assembly.
Documenting how i repaired the garage door.
Some openers use a smooth sprocket rather than one with teeth.
A new front sprocket costs about 150 200 include the labor to install it.
Replacement gear kit if you need one http amzn to 2drtdvc if you.
Just tighten enough to stop it hitting the rail.
The chain got loose and popped off the gear.