Check the breaker controlling the door opener and.
Garage door opener loose sprocket.
Make basic checks first.
Step 1 turn off the power.
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If your garage door opener s motor runs but the chain doesn t move the gear and sprocket assembly might be broken or worn.
Disconnect the power cord from your door opener before doing any kind of repair.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
Replacement gear and sprocket for liftmaster garage door openers 41c4220a 4 9 out of 5 stars 39.
If you replace the sprocket assembly in your chain drive garage door opener yourself you may be able to save a lot of money.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
The process isn t as hard as you may think so consider the guide below.
This repair guide and video show how to replace a chain drive garage door opener gear and sprocket assembly.