Checking And Correcting Mismatch Of Blades - Toro 30722 Groundsmaster 300 Operator's Manual

SHARPEN AT THIS
ANGLE ONLY
END VIEW
Figure 34
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 good a quality-of-cut and
require minimal power from the engine. By contrast, a
blade that is higher at the ends than the center, or the
cutting edge is higher than the heel of the blade, is
warped or bent and must be replaced.
5. To install the blade, assemble the parts in reverse order,
and make sure that the blade sail is facing up. Tighten
the special screw to 75–100 ft.-lb. (102 to 136 N m).
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
blades are cutting on the same plane.
1. Using a 3 foot (1 m) long carpenters level, find a flat
surface on the shop floor.
2. Set the rear castor wheels in the upper hole of the castor
forks and adjust the height-of-cut so that all 6
height-of-cut spacers are below the castor arm.
3. Lower the cutting unit onto a flat surface. Remove the
covers from the top of the cutting unit. Loosen the idler
pulleys to release the tension against all 3 belts.
4. 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 opposite end is forward and
measure again. The difference between the dimensions
must not exceed 1/8 inch (3 mm). If the difference
exceeds 1/8 inch (3 mm), replace the blade because it is
bent. Make sure to measure all three blades.
5. 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 bottom of the cutting
unit.
6. Rotate the blades so that the tips line up with one
another. The tips of the adjacent blades must be within
1/8 inch (3 mm) of each other. If the tips are not within
1/8 inch (3 mm) of each other, 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 blade and add shims until the tips of
the blades are within the required dimension.
Important
Do not use more than 3 shims at any one
hole location. Use decreasing numbers of shims in adjacent
holes if more than one shim is added to any 1 hole location.
8. Tension the idler pulleys against all 3 belts. Also install
the covers to the top of the cutting unit.
9. Set the rear castor wheels in the lower holes in the
castor forks if the height-of-cut is above 1 inch (25 mm)
and adjust the height-of-cut.
10. Mount the cutting unit to the traction unit; refer to
Mounting the Cutting Unit to the Traction Unit,
page 18.
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