Stihl Blade Imbalance or Worn Bearings

Robot lawnmower is very noisy when the blades are running, louder than usual.

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.

Possible Causes

Missing blade causing imbalance, Uneven blade wear, Worn mowing motor bearing, Bent cutting disc

Safety first: Turn the mower OFF and wear gloves.

Verify blade count: Ensure all blades are present and correctly installed. Replace missing blades immediately.
Replace blade set: If blades are worn unevenly, replace all blades as a complete set to restore balance.
Check disc wobble: Rotate the cutting disc and observe for wobble. A bent disc should be replaced.

If noise remains high after balancing the blades and disc, the mowing motor bearings may be worn and the motor should be replaced by a technician.

Medium 3/5

Cutting Blades and Cutting Disc

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