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CHECK MOWER BLADE
See Figure 11.
Check blade mounting: blade must be secure
and bolt torqued to 37.5 – 50 lbf-ft (51 –
68 N•m) (bolt should fully compress lock
washer).
Check blade for nicks and dull cutting edges.
Sharpen if necessary.
Check blade for rounded or broken ends,
thinned metal or other damage. Replace if
necessary.
To remove blade:
1. Stop engine, wait for all moving parts to
stop, and disconnect spark plug wire.
2. Block blade to prevent rotation.
3. Remove bolt, lock washer, flat washer
and blade from shaft.
To install blade:
1. Replace blade, flat washer, lock washer
and bolt on shaft.
2. Torque bolt to 37.5 – 50 lbf-ft (51 –
68 N•m) (bolt should fully compress lock
washer).
3. Connect spark plug wire.
Sharpen the Mower Blades
1. Remove mower blade from unit.
Discard mower blade if:
• More than 1/2" (1.27 cm) 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.
3. Check mower blade balance.
Slide mower blade on an unthreaded
bolt. 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
(Figure 12).
4. Install mower blade on unit.
5. Torque bolt to 37.5 – 50 lbf-ft (51 – 68
N•m).
CAUTION: Mower blades are
sharp and can cut you. Wrap the
blades or wear gloves, and use
extra caution when servicing
them.
CAUTION: DO NOT sharpen
mower blades while on unit. An
imbalanced mower blade will
cause excessive vibration and
eventual damage to unit. Check
mower blade balance before
reinstalling blades.
NEVER weld or straighten bent
blades.
Figure 11
1. Square Corner
2. Cutting Edge
3. Air Lift
4. Air Lift Erosion
Sharpen to This Pattern
DO NOT Sharpen to This Pattern
DISCARD If More
Than 1/2" (1.27 cm)
2
1
3
2
3
4
OT0792
Figure 12
OA0013
1. Blade
2. Bolt
2
1