Garage Door Opener Sprocket Broke Off

Eventually this will cause the sprocket to snap off.

Garage door opener sprocket broke off.

This is a video on how to change the gear sprockets in a craftsman garage door opener. Chain drive garage door openers have a sprocket that is attached at the top of the motor. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.

After several years the garage door springs become weaker causing more stress on. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. If the gear and sprocket assembly breaks the motor runs but the door won t move.

The chain wraps around this sprocket as well as the gear and sprocket at the motor. This gives the appearance of a broken chain or belt. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. This is the part that connects the motor to the chain or belt.

Chain driven garage door openers should have some slack in the chain for optimal performance. This was a craftsman model 139 53976srt. If you are not confident in your ability to diagnose the problem call a local garage door service company.