Craftsman Garage Door Opener Chain Off Sprocket

If the gear and sprocket assembly breaks the motor runs but the door won t move.

Craftsman garage door opener chain off sprocket.

Shop our garage door openers and find out where you can buy yours locally or online. Belt rail extension kit. 41a3589 1 liftmaster belt assy. The chain is attached to a threaded rod that is attached to the trolley.

This is a video on how to change the gear sprockets in a craftsman garage door opener. 41a5585 1 liftmaster chain drive gear and sprocket for 3 4 hp 4 30 71. There are a number of reasons why the motor will run but the chain doesn t move. Amazon s choice for craftsman garage door sprocket replacement for liftmaster 41c4220a gear and sprocket kit fits chamberlain sears craftsman 1 3 and 1 2 hp chain drive models 4 8 out of 5 stars 1 216.

Loosen the inside nut and back it off 6 8 turns back the outside nut off 5 6 turns this will give you some slack in the chain. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. 1 2 hp chain drive garage door opener kit. A list of compatible openers accompanies each part.

You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. Keep it propped open while you fix the chain. For 8 door 1270 1280 1280r 74 45. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.

Make sure the cable is inside the cable pulley and run the chain around the sprocket. Getting out of the car at the end of a long day to open the garage door can be frustrating especially when the automatic garage door opener sounds like it s working but isn t. This will release the door from the garage door opener. If you find that your garage door opener chain falls off the track on which it has been placed you will need to put it back up and then tighten the chain to stop this happening in the future.

Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. If you are outside the door when this occurs you will need some assistance to move the door manually. This was a craftsman model 139 53976srt. Belt rail extension kit.

Chain driven garage door openers should have some slack in the chain for optimal performance.