DeWalt Lawn Mower Manuals

Most Common Issues (All Cordless Models)

• Mower won't start / no power: Ensure batteries are fully charged and properly seated; check battery release button clicked in; clean battery terminals; try different battery.
• Short runtime / weak performance: Charge batteries fully (use DeWalt charger); clean underside of deck & blade; avoid thick/wet grass; replace worn blades.
• Motor stops suddenly / overload protection: Clear grass clippings from deck, blade, and discharge chute; reduce load (raise cutting height or mow slower); let cool 5–10 min.
• Blade not spinning / weak cut: Inspect blade for damage/dullness; tighten blade bolt (use correct torque); ensure safety key (if equipped) is inserted; check for grass buildup.
• Self-propelled not working: Check drive belt for wear/slipping; clean drive wheels & gears; ensure self-propel lever/cable adjusted properly; lubricate if specified.
• Blinking lights on battery or mower: Refer to LED guide – usually low charge, overheating, or fault; remove battery, wait 1 min, reinsert.

60V MAX & 2x20V MAX Models (2023–2026)

• Flashing red light / error mode: Overload or overheating – clear debris, reduce load, allow cooldown; check for blocked airflow vents.
• One battery drains faster (2x20V models): Ensure both batteries same age/charge level; alternate use; may indicate imbalance – charge separately.
• No self-propel power: Check 60V battery seated correctly; inspect drive motor connections; test with different battery pack.

General Maintenance & Safety

• Uneven cut / scalping: Adjust all four wheels to same height; check deck level; sharpen/replace blade; avoid uneven terrain at low heights.
• Excessive vibration: Blade unbalanced or bent – replace immediately; check blade adapter & spindle for damage; tighten all fasteners.
• Charging issues: Use only DeWalt chargers; clean contacts; if charger light blinks, battery may be too hot/cold or defective.

Safety note: Always remove battery packs before cleaning, blade changes, or maintenance. Wear gloves and eye protection. Never operate with damaged blade or missing guards. Keep hands/feet away from rotating blade.