LG
Mechanical Wear in Brush or Wheel Drive
Robot vacuum is very loud during operation, with grinding or rattling noises from the underside.
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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 main brush bearings, Debris in brush gearbox, Damaged drive wheel gearbox, Loose fan motor mounting
How to Fix / Troubleshooting
Safety first: Turn off and flip the robot on a soft surface. Do not run the robot while it is upside down.
- 1. Isolate noise source: Run the robot briefly and listen to determine if the noise comes from the brush area, wheels, or fan.
- 2. Inspect main brush: Remove the brush and check the end caps and shafts for wear. If the brush wobbles excessively or the bearings feel rough, replace the brush assembly.
- 3. Check wheel modules: Spin each drive wheel by hand. Grinding or clicking indicates internal gearbox wear; replace the affected wheel module.
- 4. Inspect fan housing: If the noise is from the fan area, open the top cover (if accessible) and ensure the fan housing screws are tight and no debris is contacting the impeller.
- Replacing worn mechanical modules (brush, wheels, or fan) typically restores quiet operation.
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Repair Difficulty
Medium
3/5
Required Part
Main Brush Assembly
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