Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
Garage door opener broken chain.
An instructional video on removing or replacing the chain on a garage door opener.
If the gear and sprocket assembly breaks the motor runs but the door won t move.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
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Replace a broken gear and sprocket assembly with the manufacturer approved replacement part.
For many generations people rely on this type of door opener not only because it is easy to use but also because it is cheap and can easily be repaired when broken.
The most common cause of a chain being loose and appearing broken is a broken gear and sprocket.
This can be easily replaced by a garage door service technician.
The gear and sprocket assembly is inside the cover of the garage door opener motor.
You can fix your broken door chain regardless of your familiarity with garage door repairs.
Step 1 locate the garage door s emergency release rope.