There are two main reasons why your lawn mower blade is spinning but not cutting the grass. It could be either the blade is not spinning fast enough due to slow engine speed or the blade is blunt. It is that easy.<\/p>\n\n\n\n
Nine times out of ten you will either need to sharpen your lawn mower blades or replace them. To get me out of a jam I will often sharpen the blades once before replacing them.<\/p>\n\n\n\n
Lawnmower blades will become dull and worn over time. More so if you are running over rocks, sticks, tree roots, and dirt mounds.<\/p>\n\n\n\n
The best way to sharpen lawn mower blades is with a double-cut file (2nd cut). It is best to remove the mower blades before sharpening them. Some lawn mowers will have a single cutting blade whereas others will have two or more cutting blades.<\/p>\n\n\n\n
The quick unsafe way is with a grinder.<\/p>\n\n\n\n
Warning: Lawnmower cutting blades can have sharp edges. Always wear leather gloves or take care when removing and installing lawnmower blades.<\/em> Use safety glasses when sharpening the blades.<\/p>\n\n\n\n Check the direction of the mower blades by first turning off the fuel, disconnecting the spark plug lead, and lifting up the catcher. Slowly pull the pull starter and check the spinning direction of the lawn mower blades. <\/p>\n\n\n\n Most lawn mower blades rotate in a clockwise direction when viewed from above (counter-clockwise when viewed from below).<\/p>\n\n\n\n Place the lawnmower blade in a vice and sharpen the cutting edge using the second cut file. Only sharpen the leading edge, not the fan edge that generates airflow to throw grass into the catcher.<\/p>\n\n\n\n