Toro 78370 Operator's Manual page 16

1. Remove the mower; refer to Removing the Mower,
page 11.
2. Carefully turn the mower over to expose the blades
Inspecting the Blades
1. Inspect the cutting edges (Fig. 28).
2. If the edges are not sharp or have nicks, remove the
blades and sharpen them.
3. Inspect the blades, especially the curved area (Fig. 28).
4. If you notice any damage, wear, or a slot forming in this
area (Fig. 28), immediately install a new blade.
Figure 28
1. Cutting edge
2. Curved area
Removing a Blade
1. Hold the blade end using a rag or thickly padded glove.
2. Remove the bolt, stiffener, and blade (Fig. 29).
Note: A block of wood may be wedged between the
blade and the mower to lock the blade when you are
removing the nut.
1
2
3
151
3. Wear/slot forming
16
4
2
1
Figure 29
1. Bolt
2. Stiffener
3. Inspect all parts. If damage is noticed, install new parts.
Sharpening a Blade
1. Use a file to sharpen the cutting edge at both ends of the
blade (Fig. 30).
Maintain the original angle. The blade retains its
balance if the same amount of material is removed from
both cutting edges.
1
Figure 30
1. Sharpen at original
angle
2. Check the balance of the blade by putting it on a blade
balancer (Fig. 31).
If the blade stays in a horizontal position, the blade is
balanced and can be used.
1
Figure 31
1. Blade
3. If the blade is not balanced, file some metal off the back
side of the blade.
3
m–3516
3. Blade
4. Spindle
2
2. Balancer