Duramaxx 85729 Owner's Manual page 26

MAINTENANCE
BALANCING THE BLADE (Fig. 15)
When sharpening, care should be taken to keep the blade balanced. An unbalanced blade
will cause excessive vibration when the mower is running. This vibration will eventually
cause damage to the mower, especially the motor.
To check the blade balance:
■ Clamp a screwdriver horizontally in a vise as shown.
NOTE: If a vise is not available, a straight nail can also be used.
■ Place the center hole of blade on the screwdriver (or nail) shank.
■ If blade is balanced, it will remain in a horizontal position. If either end of the blade drops
downward, sharpen the heavy side until the blade is balanced.
Fig. 15
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