SOURCE: I just installed a Sears Craftsman 1/2 HP Garage
Pull down on the manual release rope. It may be hard to pull.
Loosen the chain enough
so that you can remove it from the sprocket above the motor unit.
With the door closed run the motor until the sprocket turns clockwise
and stops. With everything attached replace and tighten the chain.
Some adjusting of the up and down limits will probably be required.
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