Simplicity Cobalt Series Operator's Manual page 31

37
38
3. If the cutting edges are not sharp or have nicks, sharpen
the blades. See Sharpening the Mower Blades.
Sharpening the Mower Blades
WARNING
Thrown objects and fire hazard
Grinding mower blades throws sparks and fine metal
particles that are capable of igniting gasoline and gasoline
vapors, and that can injure unprotected eyes.
Be sure all flammable materials are cleared from the area
where grinding will occur.
Always wear safety glasses or goggles when grinding
mower blades.
1. Sharpen mower blades with a grinder, hand file, or
electric blade sharpener.
2. Sharpen the blade by removing an equal amount of
material from the cutting edge of each end of the blade.
3. Keep the original bevel (A, Figure 39) when grinding. DO
NOT change the mower blade bevel.
39
4. The mower blade should have a maximum of 1/64" (0,40
mm) cutting edge (B) or less.
Balancing the Mower Blades
CAUTION
Thrown objects hazard
An unbalanced mower blade can create excessive vibration
and damage the unit, or cause mower blade failure resulting
in thrown debris.
Be sure blade is balanced before installing.
1. Clean the mower blade to remove any dried grass or
other debris.
2. Clamp a nail in a bench vise, hang the mower blade
on the nail, and position the blade in a level horizontal
position as shown in Figure 40.
40
3. Check the balance of the mower blade. If either end of
the mower blade moves downward is heavier than the
other. Sharpen the heavy end until balance is achieved.
See Sharpening the Mower Blades for sharpening
instructions.
4. Repeat the process until the mower blade remains in the
horizontal, level position.
Installing the Mower Blades
1. Install each mower blade with the air lifts (C, Figure 41)
pointing up towards the mower deck as shown in
Figure 41 and secure with the mower blade mounting bolt
(A) and flat washer (B).
31