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original cutting angle to ensure sharpness (Figure 29).
The blade will remain balanced if the same amount of
metal is removed from both cutting edges.
1. Sharpen at original angle
4. To check the blade for being straight and parallel, lay
the blade on a level surface and check the ends. The
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 a 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(s).
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 meter (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 the flat surface. Remove
the covers from the top of the cutting unit.
4. Unhook the spring from the idler arm bracket 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 7 and add shims
Figure 29
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 three shims at
any one hole location. Use decreasing numbers of
shims in adjacent holes if more than one shim is
added to any one hole location.
8. Hook the spring onto the idler arm bracket.
9. Install the belt covers.
22
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