Garage Door Opener Sprocket Broke Off

If you are not confident in your ability to diagnose the problem call a local garage door service company.

Garage door opener sprocket broke off.

This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. Sprocket is at the end of the opener rail closest to the garage door opening.

The chain wraps around this sprocket as well as the gear and sprocket at the motor. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. 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.

This is a video on how to change the gear sprockets in a craftsman garage door opener. This was a craftsman model 139 53976srt. A new front sprocket costs about 150 200 include the labor to install it. After several years the garage door springs become weaker causing more stress on.

This gives the appearance of a broken chain or belt. Chain drive garage door openers have a sprocket that is attached at the top of the motor. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism.