Robot lawnmower leaves clumps of grass and the cut looks ragged, especially in damp conditions.

Safety first: Turn OFF the mower and remove the battery. Wear gloves when handling blades.

• Inspect blades: Remove each NAC blade and check for nicks, bends, or dull edges. Replace all blades as a set if any are damaged.
• Adjust cutting height: Raise the cutting height one or two steps and test again. Very low settings on uneven lawns cause scalping and clumping.
• Mow in dry conditions: Schedule mowing for dry periods. Wet grass sticks under the deck and clumps more easily.
• Check battery and motor: Ensure the battery is healthy and fully charging. If the blade motor sounds weak or slows under light load, consider replacing the motor or battery pack.

Warning: Only use NAC‑approved blades; incorrect blades can overload the motor and reduce cut quality.