18
SHARPENING THE BLADE
Before taking the time and effort to sharpen the blades, make
sure that it needs sharpening. Most
issues can be solved by
ensuring the blades are properly adjusted.
1. Prop up the push mower so that the blade reel can be
rotated by turning the wheels.
2. Check the blades for nicks and burrs. If any damage is
found, it can usually be removed by holding a file flat against
the blade and pushing away from the edge.
3. Examine the cutting bar; it should just meet the blades
along their entire length. To make sure the cutting bar is
located correctly, grasp a wheel and turn it forward; you
should hear a whispery sound as the blades pass the
cutting bar.
4. If the bar is out of alignment, adjust using the adjustment
knobs on the ends of the bar.
5. Using your fingers or a soft paint brush, cover the blades
with a thin, even coat of automotive valve-grinding compound
(available at automotive stores).
6. Grasp a wheel and turn it slowly backwards so the grinding
compound is squeezed between the blades and the cutting
bar, thereby sharpening both cutting edges as they pass each
other. Be sure that each blade touches the bar as the wheel
is rotated.
7. Make about a dozen turns, applying more grinding
compound when necessary.
8. Examine the blade edges. If they look sharp, wash off all the
valve compound with soapy water and rinse thoroughly.
9. Test for sharpness. Insert a sheet of newspaper between
the blades and the cutting bar, then rotate the reel forward.
When the blades cut the paper as easily and cleanly as a sharp
pair of scissors would, the task is complete.
