Stanley
Stripped Drive Gear or Sprocket Failure
Opener hums but chain or belt does not move; door does not open or close.
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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 inside opener, Broken drive sprocket on top of unit, Chain too tight causing overload, Lack of lubrication over time
How to Fix / Troubleshooting
Safety first: Disconnect power and do not continue to run a humming motor; it can overheat. Use a stable ladder when working overhead.
Steps to address drive gear failure:
- 1. Remove cover: Take off the opener housing cover to expose the internal drive assembly.
- 2. Inspect drive gear: On many Stanley units, a nylon or plastic gear meshes with the motor worm gear. Look for missing teeth, plastic shavings, or a smooth, worn gear.
- 3. Check top sprocket: Inspect the chain sprocket on top of the opener for cracks or wobble. Ensure the retaining pin or clip is intact.
- 4. Replace gear kit: If the gear is stripped, install a Stanley-compatible drive gear and sprocket kit. Follow the kit instructions to remove the old gear, clean out debris, grease the new gear, and reassemble.
- 5. Adjust chain tension: After reassembly, set the chain tension to allow slight sag at mid-span to avoid overloading the new gear.
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Repair Difficulty
Hard
4/5
Required Part
Stanley Drive Gear and Sprocket Kit
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