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

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. 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 102 to 136 N-m (75–100 ft.-lb.).
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. Set the rear castor wheels in the upper hole of caster
forks and adjust the height of cut so all six height of
cut spacers are below the caster arm.
3. Lower the cutting unit onto the flat surface. Remove
the covers from the top of the cutting unit.
4. Loosen the idler pulleys to release the tension against
all three belts.
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
between the spindle housing and the bottom of the
cutting unit.
7. Remove capscrews, flat washers, lock washers and nuts
from outer spindle, in the area where shims must be
added. To raise or lower the blade, add a shim, Part
No. 3256-24, between spindle housing and bottom of
cutting unit. Continue to check alignment of blade and
add shims until tips of 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. Tension idler pulleys against all three belts.
9. Install the covers to the top of the cutting unit.
10. Set the rear castor wheels in the lower holes in the
castor forks if the height-of-cut is above 25 mm (1
inch) and adjust the height-of-cut.
11. Adjust the height of cut.
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