Check the breaker controlling the door opener and reset if it it s tripped.
Garage door not connected to chain.
Remove this nut from the bolt with a socket wrench.
The motor will run but will not move the chain.
This enables the trolley to connect to the carriage.
A chain drive garage door usually has two small switches on the top of the unit these are triggered when small rollers attached to the chain ride into the mechanism.
When the cord is pulled the motor is disengaged from the chain.
This distinctive chain features a tension bolt with a nut at its open end.
Otherwise the solution is to add some links to the chain.
If an extension is being used is comes with a longer chain and cable.
The chain is located in the garage door s pulley bar.
If your opener seems to overrun the switch and just keeps trying to pull the garage door up or down after it reaches the end of travel you might assume that it missed the.
Begin the chain disassembly.
Raise the garage door fully.
Pull straight down on the emergency release rope once the door is open.
I provided a video to help adjust the chain.
You may be missing that part.
Just click here to watch the video.