EN - 24
Sharpen the Mower Blades
See Figure 15.
1. Remove mower blade from unit. Discard
mower blade if:
• More than1.27 cm (1/2") of metal is
removed.
• Air lifts become eroded.
• Blade is bent or broken.
2. Sharpen mower blade by removing an
equal amount of material from each end
of mower blade. DO NOT change angle
of cutting edge or round the corner of the
mower blade.
IMPORTANT: When sharpening blades, be
sure to grind the same amount on each side.
Unbalanced blades cause excessive
vibration and could cause the spindles to
wear prematurely.
3. Check mower blade balance. See
Figure 16.
Clamp a bolt to a table or mount in a vise
and slide mower blade onto unthreaded
portion. A balanced blade should remain
in a horizontal position. If either end of
mower blade moves downward, sharpen
the heavy end until blade is balanced.
4. Make sure the wings are facing up and
Install mower blade(s) on unit.
5. Torque bolts to 156 – 217 N•m
(115 – 160 lb-ft).
CAUTION: DO NOT sharpen
mower blades while on unit. An
unbalanced mower blade will
cause excessive vibration and
eventual damage to unit. Check
mower blade balance before
reinstalling blades.
NEVER weld or straighten bent
blades.
1. Cutting Edge
2. Square Corner
3. Air Lift Erosion
4. Air Lift
Figure 15
DO NOT sharpen to this pattern.
Sharpen to this pattern.
DISCARD if more than
1.27 cm (1/2").
1
1
4
2
4
3
Figure 16
2
1
1. Mower Blade
2. Rod
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