Toro 74405FR Operator's Manual page 30

Figure 38
4. Rotate the opposite ends of the blades forward.
5. Measure from a level surface to the cutting
edge of the blades at the same position as
in step 3 above. The difference between the
dimensions obtained in steps 3 and 4 must not
exceed 1/8 inch (3 mm). If this dimension
exceeds 1/8 inch (3 mm), the blade is bent
and must be replaced; refer to Removing the
Blades and Installing the Blades.
A blade that is bent or damaged could
break apart and could seriously injure or
kill you or bystanders.
• Always replace bent or damaged
blade with a new blade.
• Never file or create sharp notches in
the edges or surfaces of blade.
Removing the Blades
The blades must be replaced if a solid object is
hit, if the blade is out of balance, or the blade
is bent. To ensure optimum performance and
continued safety conformance of the machine, use
genuine Toro replacement blades. Replacement
blades made by other manufacturers may result in
non-conformance with safety standards.
Hold the blade end using a rag or thickly-padded
glove. Remove the blade bolt, curved washer,
stifener and blade from the spindle shaft
(Figure 39).
Figure 39
1. Sail area of blade
2. Blade
3. Curved washer
Sharpening the Blades
1. Use a file to sharpen the cutting edge at both
ends of the blade (Figure 40). Maintain the
original angle. The blade retains its balance if
the same amount of material is removed from
both cutting edges.
Figure 40
1. Sharpen at original angle
2. Check the balance of the blade by putting it on
a blade balancer (Figure 41). If the blade stays
in a horizontal position, the blade is balanced
and can be used. If the blade is not balanced,
repeat the sharpening procedure on the heavier
side until the blade is balanced.
Figure 41
1. Blade
Installing the Blades
1. Install the blade onto the spindle shaft with the
stiffener (Figure 39).
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4. Blade bolt
5. Stifener
2. Balancer