1. Ragged, Brown Grass Tips After Mowing
A sharp blade cuts a clean edge. A dull blade rips and tears. If your lawn has a brown, frayed appearance within a day of mowing, the blade is shredding the grass. Torn tips are entry points for fungal disease and dry out fast in Adelaide summers.
2. You're Double-Passing the Same Patch
When you go back over areas already mowed because the mower "missed" them, that's usually a blade issue. Dull blades struggle to make clean contact, leaving longer strands that fall away from the cut.
3. Excessive Vibration
More vibration than usual often means an unbalanced blade — common after a nick on a rock or root with no follow-up balance. An unbalanced blade also stresses the engine crankshaft bearings over time.
4. Engine Working Noticeably Harder
A sharp blade spins cleanly through grass. A dull blade drags. If the engine labours and slows in thicker sections, a dull blade is often partly to blame — the engine is fighting what should be an easy cut.
5. You Can't Remember the Last Sharpen
Sharpen every 20–25 hours of mowing, or at minimum once per season. If you can't remember, that's your sign. A blade sharpen and balance at Gotcha Mowers starts from $25 flat — most jobs done same or next day.