Blade Sharpening - Honda HRA536 Manual

HRA536 - HRD535 - HRD536
[2]
[4]
[6]
- BLADE / ROTOSTOP
[1]
[3]
[5]

4.6 Blade sharpening

1. Stop the engine and remove the spark plug cap to prevent accidental stating.
Blade will start spinning if the Rotostop lever is pulled back while the engine is
running.
Stop the engine and disconnect the spark plug cap before inspecting the blade or
placing your hands near the cutter housing.
Tilt the mower so the carburetor side up.
Wear heavy gloves to protect your hands when handling the blade.
2. Use a wooden block to prevent the blade from turning, and remove the two blade
screws and blade.
3. Inspect the blade for signs of wear or damage. A blade that is worn out, bent, cracked,
or other damaged must be replaced. A dull blade can be sharpened.
4. Grind or file the blade no more than is necessary to remove nicks and to restore
straight, sharp cutting edges that are even with the lower surface of the blade.
NOTE: Grinding or filing a step in the blade can create a weak point, causing cracks to
develop during mower operation.
Grind or file the upper surface of the blade only. The cutting edge must be even with the
lower surface of the blade.
Taper the blade profile, with the maximum amount of material removed at the blade tip and
no material removed at the inner end of the cutting surface.
Maintain the original blade bevel angle (30 - 40°) while sharpening. Do not alter the angle.
Remove equal amounts of material from both cutting edges to preserve blade symmetry
and balance.
5. 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 blade should be
0.1 - 0.3 mm thick at the cutting edges.
6. Test blade balance by placing the clean, sharpened blade on a screw driver 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.
NOTE: An unbalanced blade will cause abnormal vibration and may eventually damage
mower.
7. Install the blade.
TIGHTNING TORQUE: 55 N.m
[1] DULL CUTTING EDGE
[2] CORRECT SHARPENING
[3] TAPER
[4] INCORRECT SHARPENING
[5] STEP
[6] SHARPEN AT ORIGINAL ANGLE
0.1 - 0.3 mm
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