Honda HRB215K3PDA Harmony Owner's Manual page 58

MAINTENANCE
BLADE REMOVAL AND INSTALLATION
If you remove the blade(s) for sharpening or replacement, you will need
a torque wrench for installation. Wear heavy gloves to protect your
hands.
BLADE SHARPENING: To avoid weakening the blade(s), or causing
imbalance or poor cutting, the blade(s) should be sharpened by
trained staff at an authorized Honda servicing dealer.
BLADE REPLACEMENT: Use genuine Honda replacement blade(s)
or their equivalent.
Blade Removal
1. Always turn the engine OFF and turn the fuel valve to the OFF
position. Disconnect the spark plug cap, then tilt the mower to the
right side, so the carburetor side is up. This will help to prevent fuel
leakage and hard starting due to carburetor flooding.
2. Remove the two blade bolts with a 14 mm socket wrench. Use a
wooden block to prevent the blade(s) from turning when removing
the bolts.
3. Remove the blade(s) from the blade holder.
UPPER MULCHING BLADE
(standard for HRM215)
56
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SPECIAL WASHER (2)
or
HIGH-LIFT BLADE
(standard for HRB215)