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3.
Install blade–sail facing toward the cutting unit with the cup,
lockwasher and blade bolt. Tighten the blade bolt to 85-110 ft-
lb.
INSPECTING AND SHARPENING BLADE
(Fig. 18–19)
1.
Raise the cutting unit to the highest position, shut the engine
off and engage the parking brake. Block the cutting unit to
prevent 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. 26-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 you notice wear (Fig. 26-B),
replace the blade: refer to Removing Cutter Blade.
If the blade is allowed to wear, a slot will form
between the sail and flat part of the blade (Fig. 26-C).
Eventually a piece of the blade may break off and be
thrown from under the housing, possibly resulting in
serious injury to yourself or bystander.s.
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. 27). 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 it on a
level surface and check its ends. Ends of blade must be slight-
ly lower than the center, and the cutting edge must be lower
than the heel of the blade. This blade will produce a good qual-
ity of cut and require minimal power from the engine. By con-
trast, a blade that is higher at the ends than the center, with a
cutting edge higher than the heel, must be replaced.
5.
Install the blade-sail facing toward the cutting unit with the
cup, lockwasher and blade bolt. Tighten the blade bolt to
115–149Nm
20
WARNING
Figure 18
1.
Sail
2.
Wear
3.
Slot formed
Figure 19
1.
Sharpen at this angle only
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