Garage Door Opener Motor Unit Replacement

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The chain is under a sizeable amount of tension. It is vital that you release that tension safely in this step before continuing with the replacement.
Loosen up the nuts and washers that hold the chain to the unit. This loosens the chain and prevents the chain from springing back.
This can be a slow step if your power tools can't reach the nuts. Take the time to understand your new motor unit and the garage door infrastructure as you do this.

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