Sprocket broken on LiftMaster Chain Drive Garage Door Opener in Vancouver
Sprocket broken on LiftMaster Chain Drive Garage Door Opener in Vancouver

Sproket that has broken off. You can see the broken pin that is in the middle that has a missing sprocket head. This is caused from a heavy garage door that has been lifted by the motor for a considerable time. You can see the sleeve bearing that houses the assembly also worn away. You can see the filings that are piled up around the opening.
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