NAC
Mechanical Noise / Bearing Wear
Robot lawnmower is very noisy during operation, with grinding or rattling sounds from underneath.
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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 blade motor bearings, Loose blade disc, Damaged drive wheel bearings, Foreign object trapped in cutting deck
How to Fix / Troubleshooting
Safety first: Switch OFF the mower, remove the battery, and wear gloves before inspecting the underside.
- Inspect cutting disc: Check that the NAC blade disc is firmly attached to the motor shaft. Tighten the central bolt to the specified torque.
- Check for debris: Remove stones, branches, or hard objects from the cutting chamber and around the wheels.
- Spin components by hand: Rotate the blade disc and each wheel. Listen for grinding or roughness that indicates worn bearings.
- Replace worn parts: If the blade motor or wheel bearings are noisy when turned by hand, replace the corresponding NAC motor or wheel module.
Warning: Do not operate the mower if mechanical noise suddenly increases; internal failure could lead to part breakage.
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Repair Difficulty
Medium
3/5
Required Part
Blade Motor Assembly
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