Blade Maintenance
Maintaining the Blade
Always mow with a sharp blade. A sharp blade cuts cleanly
and without tearing or shredding the grass blades.
1.
Stop the engine and wait for all moving parts to stop.
2.
Disconnect the wire from the spark plug.
3.
Drain the gasoline from the fuel tank.
4.
Tip the mower onto its
left
side (air cleaner up)
(Figure 28).
Figure 28
1.
Blade
3.
Blade bolt and lock washer
2.
Accelerator
Inspecting the Blade
Service Interval:
Before each use or daily—Inspect the
mower blades for wear or damage.
Carefully examine the blade for sharpness and wear, especially
where the flat and the curved parts meet (Figure 29A).
Because sand and abrasive material can wear away the metal
that connects the flat and curved parts of the blade, check the
blade before using the mower. If you notice a slot or wear
(Figure 29 B and C), replace the blade; refer to Removing
the Blade.
Figure 29
1.
Sail
3.
Wear
2.
Flat part of the blade
4.
Slot formed
Note:
For the best performance, install a new blade before
the cutting season begins. During the year, file down any
small nicks to maintain the cutting edge.
DANGER
A worn or damaged blade can break, and a piece
of the blade could be thrown into the operator's
or bystander's area, resulting in serious personal
injury or death.
•
Inspect the blade periodically for wear or
damage.
•
Replace a worn or damaged blade.
Removing the Blade
1.
Grasp the end of the blade using a rag or a thickly
padded glove.
2.
Remove the blade bolt, the lock washer, the accelerator,
and the blade (Figure 29).
Sharpening the Blade
Service Interval:
Every 50 hours—Sharpen or replace the
blade. Maintain it more frequently if the
edge dulls quickly in rough or in sandy
conditions.
File the top side of the blade to maintain its original cutting
angle (Figure 30A) and inner cutting edge radius (Figure 30B).
The blade will remain balanced if you remove the same
amount of material from both cutting edges.
Figure 30
1.
Sharpen at this angle only.
2.
Maintain the original radius
here.
Balancing the Blade
1.
Check the balance of the blade by placing the center
hole of the blade over a nail or screwdriver shank
clamped horizontally in a vise (Figure 31).
Figure 31
Note:
You can also check the balance using a
commercially manufactured blade balancer.
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