Garage Door Chain Sprocket Broke

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.

Garage door chain sprocket broke.

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 diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. It was a perfect replacement and the garage door is working.

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. 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 can be easily replaced by a garage door service technician. If the gear and sprocket assembly breaks the motor runs but the door won t move. Your garage door opener has a gear and sprocket that will eventually fail. Liftmaster and chamberlain garage door openers are very common for this.

The gear and sprocket assembly is inside the cover of the garage door opener motor. The bag said it was an oem piece. The most common cause of a chain being loose and appearing broken is a broken gear and sprocket. Chain driven garage door openers should have some slack in the chain for optimal performance.

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 this particular part causing it to fail and wear out.