Exmark METRO 21 Operator's Manual page 25

4. Tip the lawn mower onto its right side (see
Figure 18 and Figure 19).
Figure 18
Blade Brake Clutch Units Only
1. Accelerator
2. Anti-Scalp Cup
Figure 19
Units Without a Blade Brake Clutch Only
1. Blade
2. Blade Bolt
5. Inspect the blade for sharpness and wear,
especially where the flat and the curved parts
meet (see Figure 20A). 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 lawn mower. If you
notice a slot or wear (Figure 20B and Figure 20C),
replace the blade.
3. Blade
4. Blade Nuts
3. Accelerator
1. Sail
2. Flat
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. 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.
If it is necessary to remove the blade for
replacement or sharpening, complete the
following steps:
6. Remove the blade. Make sure to grasp the end of
the blade using a rag or a thickly padded glove.
• For Blade Brake Clutch Units: Remove the
blade nuts, anti-scalp cup, accelerator, and the
blade (Figure 18).
• For Units without a Blade Brake Clutch:
Remove the blade bolt, accelerator, and blade
(Figure 19).
7. For Sharpening: File the top side of the blade to
maintain its original cutting angle (Figure 21A)
and inner cutting edge radius (Figure 21B). The
blade will remain balanced if you remove the same
amount of material from both cutting edges.
25
Maintenance
Figure 20
3. Wear
4. Slot