Cutterhead Cylinder To Bottom Blade Adjustment - Toro CT2120 30655 Operator's Manual

1. Scraper wire retaining nuts
Note: Do not over tighten the scraper wires.
Cutterhead Cylinder to Bottom
Blade Adjustment
Important: It is essential that the relationship
between the bottom blades and the cutting cylinders
is kept in good adjustment in order to ensure good
cutting performance, minimum power consumption
and prolonged life for the cutting edges.
Do not be tempted to over adjust, thus causing heavy
contact between the cylinder and bottom blade, as this
will cause very rapid uneven wear to take place leading
to tram lining and waviness of the cutting edges. The
frictional losses will be high and a significant amount
of power will be absorbed, thus reducing the power
available for cutting. The heating effect due to friction
will cause excessive expansion to take place which will
further aggravate the situation by increasing the contact
pressure.
If the cutterheads are allowed to operate for more than
a few hours without adjustment, the running wear will
eventually cause the cylinder to run out of contact with
the bottom blade. At this stage very rapid rounding
of the cutting edges will occur as grass and abrasive
particles pass through the clearance between the blades.
Lack of attention to adjustments can result in
maintenance costs escalating. The quality of cut will
also be seriously affected as will the health and growth
of the grass.
An experienced operator will notice when a cutterhead
starts to go out of adjustment; when the grass ceases to
be cut cleanly and the cut ends become ragged.
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G014440
Figure 66
Carry out the following procedure before commencing
work and check the settings every few hours.
0
90
1. Check that the cutting cylinder is correctly set to
the bottom blade by holding a thin piece of paper
between the cutting cylinder and the bottom blade
as shown.
2. Carefully rotate the cylinder as shown and check
that the paper is cut cleanly at all points along the
length of the blade. Hold the paper at a 90 degree
right angle to the bottom blade to obtain the correct
cutting action.
WARNING
Ensure that people are clear of the cutting
cylinders as rotation of one may cause others
to rotate.
3. If adjustment is necessary proceed as follows, release
the nut (Figure 68) a 1/4 turn on both ends.
4. Turn hand wheel (Figure 68) each end alternately
whilst rotating the cutting cylinder backwards until
the bottom blade is in fleeting contact with the
cylinder along its entire length.
5. Check the cutting action along the length of the
bottom blade using a thin piece of paper making
marginal adjustments as necessary.
6. Tighten nut (Figure 68) both ends.
If it is impossible to obtain a good clean paper cut
across the entire length of the bottom blade it will be
47
Figure 67
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