The one you re looking for is attached to a bolt found at the spot where the trolley or carriage connects to the rail.
Garage door chain tight one side loose other chamberlain.
Tightening your garage door chain is a simple matter of turning the right nut.
Adjust it tight enough so that the center of the chain sags about 1 2 down from parallel with the track graphic below right.
Once you are clear that the only problem is a slightly loose chain then you can begin fixing the problem.
You loosen the locking inner nut and turn the outer nut clockwise to adjust the excess slack from the chain.
This will cause premature wear on the chain rollers.
The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
Garage door chain tight one side loose other posted on may 21 2020 by bandi ruma how to fix your garage door opener garage door chain loose okice co garage door opener repair and tighten and adjust garage door cables my garage door cables are loose.
Step 2 turning off the power.