Garage Door Opener Sprocket Broke Off

Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.

Garage door opener sprocket broke off.

Chain driven garage door openers should have some slack in the chain for optimal performance. A new front sprocket costs about 150 200 include the labor to install it. The chain wraps around this sprocket as well as the gear and sprocket at the motor. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

After several years the garage door springs become weaker causing more stress on. Eventually this will cause the sprocket to snap off. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. This was a craftsman model 139 53976srt.

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. 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 gives the appearance of a broken chain or belt. If the gear and sprocket assembly breaks the motor runs but the door won t move. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.