Garage Door Chain Sprocket Tie Down

I had a chain come off the sprocket on my chamberlain garage door opener.

Garage door chain sprocket tie down.

When the sprocket rotates clockwise and stops by itself the motor will be in a closed position. Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor. Activate the opener via remote control and watch the sprocket. Lay the chain on the garage floor while you complete the repair.

Can be used on tube shafts. Pull the chain off the motor unit sprocket and out of the chain spreader. Plug the opener back in. Liftmaster 41c4220a gear and sprocket kit for chamberlain sears craftsman and liftmaster 1 3 and 1 2 hp chain drive models 4 8 out of 5 stars 3 339 20 34 20.

This sprocket is typically used on a soled keyed garage door shaft. When used on tube shafts it is advisable to fill the tube shaft with a steel or wood dowel in the area of the sprocket and through bolt the sprocket. I tried to work with the down screw to put it in reverse but that did not help. I loosened the nuts to allow me to put it back on tightened it back up and now the door goes down but comes 1 3 of the way up again.

Place a stepladder near the motor and unplug the power cord for the motor from the electrical. Drill through the sprocket and shaft and install a bolt hardened bolt if needed through the shaft. Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley. Thread the nut s facing the door clockwise until it meets the bracket then release the chain.

Press down on the chain with your finger. Loosen the chain or belt tension and slip the chain or belt off the sprocket. 34 1 02 oz 20 62 20 62. Slide the outer trolley away from the inner trolley.