Mighty Mule
Stripped Drive Gear or Sprocket Failure
Opener motor runs but chain/belt does not move; grinding or humming noise from head unit.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn plastic drive gear, Broken drive sprocket, Lack of lubrication, Overloaded door causing gear wear
How to Fix / Troubleshooting
Safety first: Disconnect power and release the door. Do not operate the opener until the fault is corrected.
- Verify door balance: Ensure the door is properly counterbalanced and moves easily by hand. Have springs serviced if the door is heavy.
- Inspect drive system: Remove the opener cover. Look for plastic shavings or metal fragments around the drive gear and sprocket.
- Check sprocket: Confirm the chain/belt sprocket on top of the opener is not broken or loose. Replace if the shaft spins but the sprocket does not.
- Replace gear kit: If the main drive gear teeth are stripped, install a Mighty Mule-compatible gear and sprocket kit following the service instructions, or replace the opener head if parts are not available.
- Lubricate: Lightly grease the new gear as recommended to extend life.
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Repair Difficulty
Hard
4/5
Required Part
Mighty Mule Drive Gear and Sprocket Kit
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