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.

This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. 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. The bag said it was an oem piece.

Liftmaster and chamberlain garage door openers are very common for this. Chain driven garage door openers should have some slack in the chain for optimal performance. Your garage door opener has a gear and sprocket that will eventually fail. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.

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. This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets.

Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. This was a craftsman model 139 53976srt. After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out. It was a perfect replacement and the garage door is working.

This is the part that connects the motor to the chain or belt. This can be easily replaced by a garage door service technician.