Toro 74380 Operator's Manual page 23

the mower, cutting quality will eventually become
unsatisfactory.
Blade Maintenance
Maintain a sharp blade throughout the cutting season
because a sharp blade cuts cleanly without tearing or
shredding the grass blades. Tearing and shredding turns
grass brown at the edges, which slows growth and
increases the chance of disease. Check the cutter blades
daily for sharpness, and for any wear or damage. File
down any nicks and sharpen the blades as necessary. If
a blade is damaged or worn, replace it immediately with
a genuine Toro replacement blade.
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