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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 89
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).
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 3 foot (1 meter) 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. 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 1/8 inch (3 mm).
If the dimension exceeds 1/8 inch (3 mm), 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 3/8 inch (10 mm) lower than the outer blades.
If the center blade is more than 3/8 inch (10 mm)
lower than the outer blades, proceed to step 7 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 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. Adjust the idler pulley and install the belt covers.
56
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