3-5
HRN216 MAINTENANCE
SHARPENING
Do not sharpen a blade that is damaged or excessively worn
or corroded.
1. Grind or file the blades no more than necessary to remove
nicks and restore straight, sharp cutting edges.
• Always wear eye protection when operating a grinder.
• Wear heavy gloves to protect your hands.
• Grind or file the upper surface of the blades only.
The cutting edge must be even with the lower surface of
the blades.
• Taper the blade profile, removing material from the
blade tip, never the inner end of the cutting surface.
Grinding or filing a step in the blades can create a weak
point, causing cracks to develop in the blades during
mower operation.
• Maintain the original bevel angle (30° ~ 40°) while
sharpening. Do not alter the angle.
• Remove equal amounts of material from both cutting
edges to preserve symmetry and balance.
2. After sharpening, dress the cutting edges with a file,
so they will not be razor-sharp. Razor-sharp edges will
easily chip and will quickly become dull.
The blades should be 0.1 ~ 0.3 mm (0.004 ~ 0.012 in)
thick at the cutting edges.
3. Check blade balance by placing the clean, sharpened
blade on a dowel or screwdriver, as shown. A balanced
blade will stay horizontal. If one end of the blade dips,
grind or file the heavy end until good balance is achieved.
An unbalanced blade will cause abnormal vibration that
may eventually damage the mower.
0.1 ~ 0.3 mm
(0.004 ~ 0.012 in)
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