Garage Door Chain Sprocket Broke

Chain driven garage door openers should have some slack in the chain for optimal performance.

Garage door chain sprocket broke.

It was a perfect replacement and the garage door is working. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. This was a craftsman model 139 53976srt.

You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. Liftmaster and chamberlain garage door openers are very common for this. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

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. 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 particular part causing it to fail and wear out.

This is the part that connects the motor to the chain or belt. The bag said it was an oem piece. This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday. Your garage door opener has a gear and sprocket that will eventually fail.

The most common cause of a chain being loose and appearing broken is a broken gear and sprocket. If the gear and sprocket assembly breaks the motor runs but the door won t move.