DANGER
If the blade is allowed to wear, a slot will form
between the sail and flat part of the blade.
Eventually a piece of the blade may break
off and be thrown from under the housing,
possibly resulting in serious injury to you or
bystanders.
•
Inspect the blade periodically for wear or
damage.
•
Never try to straighten a blade that is bent
or weld a broken or cracked blade.
•
Replace a worn or damaged blade.
Figure 84
1.
Sharpen at original angle
Note:
Remove the blades and sharpen them on a
grinder. After sharpening the cutting edges, install the
blade with the anti-scalp cup and blade bolt; refer to
Removing and Installing the Cutter Blade(s) (page 55)
.
Correcting Cutting Unit
Mismatch
If there is mismatch between the blades, on a single cutting
unit, 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 meter (3 foot) 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 (page 28)
.
3.
Lower the cutting unit onto the flat surface. Remove
the covers from the top of the cutting unit.
4.
Loosen the flange nut securing the idler pulley to
release the belt tension.
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 10 mm (3/8 inch) lower
than the outer blades, proceed to step
and add shims
between the spindle housing and the bottom of the
cutting unit.
7.
Remove the bolts, flat washers, lock washers, and nuts
from the outer spindle in the area where the shims
must be added. To raise or lower the blade, add a shim,
Part No. 3256-24, between the spindle housing and
the bottom of the cutting unit. Continue to check the
alignment of the blades and add shims until the tips of
the blades are within the required dimension.
Important:
Do not use more than 3 shims at any 1
hole location. Use decreasing numbers of shims
in adjacent holes if more than 1 shim is added to
any 1 hole location.
8.
Adjust the idler pulley and install the belt covers.
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