Correcting Cutting Unit Mismatch - Toro 30410 Operator's Manual

If the blade is allowed to wear, a slot
will form between the sail and flat part
of the blade (Figure 93). 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 94
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.
Spark Arrestor
Maintenance
Servicing the Spark Arrestor
Mufer
Every 200 hours operation, clear the muffler of
carbon buildup.
1. Remove the pipe plug from the clean-out port
at the lower side of the muffler.
57