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INSPECTING AND SHARPENING THE
BLADE (Fig 17–18)
1.
Raise the cutting unit to its highest position, shut the engine off
and engage the parking brake. Block the cutting unit to pre-
vent it from falling accidentally.
2.
Examine the cutting ends of the blade carefully, especially
where the flat and curved parts of the blade meet (Fig. 17 A).
Since 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 machine. If wear is noticed (Fig. 17 B),
replace the blade: refer to Removing The Cutter Blade.
3.
Inspect the cutting edges of all blades. Sharpen the cutting
edges if they are dull or nicked. Sharpen only the top of the
cutting edge and maintain the original cutting angle to make
sure of sharpness (Fig. 18). The blade will remain balanced if
the same amount of metal is removed from both cutting edges.
4.
To check the blade for being straight and parallel, lay the blade
on a level surface and check its ends. Ends of the blade must
be slightly lower than the center, and the cutting edge must be
lower than the heel of the blade. This blade will produce good
quality of cut and require minimal power from the engine. By
contrast, a blade that is higher at the ends than the center, or if
the cutting edge is higher than the heel, the blade is bent or
warped and must be replaced.
5.
Install the blade–sail facing toward the cutting unit with the
anti-scalp cup, lockwasher and blade bolt. Tighten the blade
bolt to 115-149 Nm.
CORRECTING THE CUTTING UNIT MIS-
MATCH
If there is mismatch between the blades, the grass will appear
streaked when it is cut. This problem can be corrected by making
sure the blades are straight and all blades are cutting on the same
plane.
1.
Using a 3-foot long carpenters level, find a level surface on the
shop floor.
2.
Raise the height of cut to the highest position: refer to
Adjusting The Height-Of-Cut.
3.
Lower the cutting unit onto flat surface. Remove the covers
Figure 17
1.
Sail
2.
Wear
3.
Slot formed
Figure 18
1.
Sharpen at this angle only
19
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