Garage Door Sprocket Broke Off

One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

Garage door sprocket broke off.

This is the part that connects the motor to the chain or belt. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. Chain driven garage door openers should have some slack in the chain for optimal performance. The chain wraps around this sprocket as well as the gear and sprocket at the motor.

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 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.

Can be used on tube shafts. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.

Garage opener sprocket broke off i already had problems as the door would move a little trying to close then back open. This sprocket is typically used on a soled keyed garage door shaft. A new front sprocket costs about 150 200 include the labor to install it. If you are not confident in your ability to diagnose the problem call a local garage door service company.

The bag said it was an oem piece. This was a craftsman model 139 53976srt. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. If the gear and sprocket assembly breaks the motor runs but the door won t move.

Sprocket is at the end of the opener rail closest to the garage door opening. It wasn t listed for the same model but after looking online it seems that most garage door openers made after 1984 use the same sprocket assembly. After several years the garage door springs become weaker causing more stress on. This gives the appearance of a broken chain or belt.

Sometimes it was taking several tries sometimes it was going fine the first time.