22
SHARPEN AT THIS
ANGLE ONLY
END VIEW
Figure 28
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; refer to Removing the Cutter Blade,
page 21.
Correcting Cutting Unit
Mismatch
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 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, page 12.
3. Lower the cutting unit onto a 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 and 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 in. (3 mm). If the dimension
exceeds 1/8 in. (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 in. (10 mm) lower than the outer blades. If the
center blade is more than 3/8 in. (10 mm) lower than the
outer blades, proceed to step 7 and add shims between
the spindle housing and bottom of the cutting unit.
7. Remove the capscrews, 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
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 3shims 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. Install the
belt covers.
Summary of Contents for 30716
Page 23: ...23 Troubleshooting 85 To 110...
