Garage Door Chain Sprocket Broke

The most common cause of a chain being loose and appearing broken is a broken gear and sprocket.

Garage door chain sprocket broke.

The gear and sprocket assembly is inside the cover of the garage door opener motor. Chain drive garage door openers have a sprocket that is attached at the top of the motor. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. This is a video on how to change the gear sprockets in a craftsman garage door opener.

Documenting how i repaired the garage door. After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out. I am not a professional. If the gear and sprocket assembly breaks the motor runs but the door won t move.

Chain driven garage door openers should have some slack in the chain for optimal performance. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. The chain got loose and popped off the gear. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.

Your garage door opener has a gear and sprocket that will eventually fail. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

This can be easily replaced by a garage door service technician.