Ryobi Ryobi RY401110 40V HP Brushless 21 in. CrossCut Push Mower UNEVEN CUT Error Fix: Uneven Cutting Height — Streaks or Ridges

Error code UNEVEN CUT on the Ryobi Ryobi RY401110 40V HP Brushless 21 in. CrossCut Push Mower means: Uneven Cutting Height — Streaks or Ridges. The mower leaves uneven strips, ridges, or scalp marks in the lawn. One side appears to cut lower than the other, or strips of uncut grass remain between passes. Causes: Dull or damaged blade — a dull blade tears grass rather than cutting it cleanly, and a bent blade cuts at different heights across its rotation. Remove the blade (disconnect the battery first!) and inspect: lay the blade on a flat surface to check for bends; check the cutting edge for nicks and dullness. Sharpen with a file or bench grinder, maintaining the original bevel angle. Replace the blade if it is bent, cracked, or excessively worn. Check that the blade is properly balanced after sharpening — an unbalanced blade vibrates and cuts unevenly. Uneven tire pressure — if the mower has inflatable tires, check all tires are at the same pressure. Deck leveling — ensure the cutting deck is level. Buildup of grass clippings under the deck — caked-on grass changes the airflow and cutting height. Scrape the underside of the deck clean after every few mows.

The most successful fix is "Replace Mower Blade and Level Deck" (medium difficulty, ~45 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Mower Blade and Level Deck") is rated medium difficulty and takes about 45 minutes. Tools needed: Socket wrench set, Tape measure, Air compressor or tire pump.

DIY cost: $20-$40. Professional repair typically costs $110-$180. Many homeowners save money by trying the top-ranked community fix first.

The Ryobi Ryobi RY401110 40V HP Brushless 21 in. CrossCut Push Mower has 8 other known error codes, including: BATT ALL BLINK (Battery Fault — All 4 LEDs Blinking), BATT COLD (Battery Too Cold to Operate or Charge), BATT DEPLETED (Battery Fully Depleted — No LEDs Lit), BATT OVERHEAT (Battery Over-Temperature — Tool Shuts Down), BLADE STOPS (Blade Stops Spinning in Thick Grass), and 3 more.

Error code UNEVEN CUT also appears on 1 other Ryobi model: Ryobi RY401018 40V 20 in. Brushless Push Mower. The fix may vary by model, so check each model's specific page for tailored repair steps.