Craftsman 1/2 HP Chain Direction Issue
Hello, I have replaced the entire shaft & gear assembly on my Craftsman 1/2 HP. Without the chain attached to the sproket, the motor turns the sprocket clockwise for 5 seconds, then counterclockwise for 5 seconds, then stops.
When I attach the the chain(when the inner and outer trolleys are positioned at the point closest to the garage door - basically up against the stop bolt there), the motor drives the chain TOWARD the door (i.e. closing the already closed door, essentially), and then jams and turns the motor off. Standing on a ladder behind the garage door opener, the chain on the right side of the sprocket is EXTREMELY TAUGHT while the chain on the left side of the sprocket, leading up to the door, is hanging slack.
I can yank the chain off the sprocket with a pliers (insert big banging noise here), but can't for the life of me figure out why the trolley is traveling TOWARD the door. Any help would be greatly, greatly appreciated!