Lefant
Mechanical Noise / Worn Bearings
Robot vacuum is very loud during operation, with rattling or grinding noises from the bottom.
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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
Main brush bearings worn or dry, Debris inside main brush gearbox, Fan motor bearings worn, Foreign object trapped in brush housing
How to Fix / Troubleshooting
Safety: Turn OFF the robot and remove it from the dock before inspection.
- Step 1 – Isolate noise source: Run the robot briefly while holding it and listen to determine if the noise comes from the brush area, fan exhaust, or wheels.
- Step 2 – Service main brush: Remove the main brush and end caps. Clean and lubricate the bearing surfaces lightly with a dry PTFE lubricant (avoid oils that attract dust). Replace the brush if the shaft is worn.
- Step 3 – Check for trapped objects: Inspect the brush housing and suction inlet for small hard objects (stones, screws) and remove them.
- Step 4 – Fan noise: If noise is from the exhaust, the fan bearings may be worn. This requires replacing the fan assembly.
- Step 5 – Wheel noise: If noise is from wheels, inspect wheel modules for broken gears or debris.
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Repair Difficulty
Medium
3/5
Required Part
Main Brush Assembly or Fan Motor
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