Toro 31974, Руководство оператора, Страница: 20 / 28

Check the blades for any wear or damage. The sail
lifts the grass up straight, thereby producing an even
cut and gradually wears down during operation.
1. Park the machine on a level surface, raise the
cutting unit to the T
RANSPORT
position, engage
the parking brake, shut off the engine, and
remove the key.
2. Raise the cutting unit to the S
ERVICE
position;
refer to your traction unit Operator’s Manual .
3. Examine the cutting ends of the blade carefully,
especially where the flat and curved parts of the
blade meet (
Figure 25 ).
Note:
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 wear
(
Figure 25 ), replace the blade.
g004653
Figure 25
1. Cutting edge 3. Wear/slot forming
2. Curved area 4. Crack
4. Examine the cutting edges of all of the blades
and sharpen the cutting edges if they are dull
or nicked (
Figure 26 ).
Note:
Sharpen only the top of the cutting
edge and maintain the original cutting angle
to ensure sharpness (
Figure 26 ). The blade
remains balanced if the same amount of metal
is removed from both cutting edges.
g000276
Figure 26
1. Sharpen at the original angle.
Note:
Remove the blades and sharpen them
on a grinder. After sharpening the cutting edges,
install the blade; refer to
Removing and Installing
the Cutting-Unit Blade(s) (page 19) .
Checking and Correcting
Mismatch of Blades
If there is mismatch between the blades, the grass will
appear streaked when it is cut. This problem can be
corrected by making sure that the blades are straight
and all of the blades are cutting on the same plane.
1. Using a 1 m (3 ft) long carpenter’s level, find a
level surface on the shop floor.
2. Park the machine on a level surface, lower the
cutting unit, engage the parking brake, shut off
the engine, and remove the key.
3. Raise the height of cut to the highest position;
refer to
Adjusting the Height of Cut (page 11) .
4. Remove the covers from the top of the cutting
unit.
5. Rotate the blades until the ends face forward
and backward. Measure from the floor to the
front tip of the cutting edge. Remember this
dimension. Then rotate the same blade so that
the opposite end is forward, and measure again.
The difference between the dimensions must
not exceed 3 mm (1/8 inch). If the dimension
exceeds 3 mm (1/8 inch), replace the blade
because it is bent. Make sure to measure all of
the blades.
6. Compare the measurements of the outer blades
with the center blade. The center blade must not
be more than 10 mm (3/8 inch) lower than the
outer blades. If the center blade is more than
20