Do not over tighten the chain.
Garage door chain tight one side loose other chamberlain.
This will cause premature wear on the chain rollers.
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Make sure that the garage door is closed and that you have another way of getting out of the garage.
The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
Adjust it tight enough so that the center of the chain sags about 1 2 down from parallel with the track graphic below right.
Step 2 turning off the power.
You loosen the locking inner nut and turn the outer nut clockwise to adjust the excess slack from the chain.
Once you are clear that the only problem is a slightly loose chain then you can begin fixing the problem.