Correcting Cutting Unit Mismatch - Toro 30412 Groundsmaster 4000-D Operator's Manual

1. Position the machine on a level surface. Raise the
cutting unit, engage the parking brake, put the
traction pedal in neutral, put the PTO lever in
the Off position, stop the engine, and remove the
ignition key.
2. Examine the cutting ends of the blade carefully,
especially where the flat and curved parts of the
blade meet (Figure 85). Since sand and abrasive
material can wear away the metal that connects
the flat and curved parts of the blade, check the
blade before using the mower. If wear is noticed
(Figure 85), replace the blade.
Figure 85
1. Cutting Edge
2. Curved Area
3. Examine the cutting edges of all of the blades.
Sharpen the cutting edges if they are dull or nicked.
Sharpen only the top of the cutting edge and
maintain the original cutting angle to make sure
of sharpness (Figure 86). The blade will remain
balanced if the same amount of metal is removed
from both cutting edges.
3. Wear/slot Forming
4. Crack
If the blade is allowed to wear, a slot will form
between the sail and flat part of the blade
(Figure 85). 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.
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
55
Figure 86