Checking The Mismatch Between Cutting Units - Toro 31598 Operator's Manual

Checking the Mismatch
Between Cutting Units
Due to differences in grass conditions and the
counterbalance setting of the traction unit, it is advised
that grass be cut and appearance checked before formal
cutting is started.
1. Set all cutting units to the desired height of cut;
refer to Adjusting the Height of Cut.
2. Check and adjust front and rear tractor tire pressure.
The correct air pressure in the front tires is 50 psi
(345 kPa) and the rear tires is 30 psi (207 kPa).
3. Check and adjust all castor tire pressures to 50 psi
(345 kPa).
4. Check lift and counterbalance pressures with engine
at high idle using test ports defined in Hydraulic
Systems Test Ports. Adjust as required.
5. Check for bent blades; refer to Checking for a Bent
Blade procedure in Mower Maintenance.
6. Cut grass in a test area to determine if all cutting
units are cutting at the same height.
7. If cutting unit adjustments are still needed, find a
flat surface using a 6 foot (2 m) or longer straight
edge to ensure the surface is flat.
8. To ease measuring blade plane, raise the height of
cut to the highest position; refer to Adjusting the
Height of Cut.
9. Lower cutting units onto the flat surface. Remove
the covers from the top of the cutting units.
Side Cutting Units
1. Rotate blade of each spindle until the ends face
forward and backward
2. For the outside blade spindle only, equally adjust the
1/8 inch shims on the front castor forks to match
the desired height of cut
3. Measure from floor to the front tip of the cutting
blade.
4. Rotate the blade 180° and measure from floor to
the tip of the cutting blade.
5. The rear of the blade should be .300 inch (7.5 mm)
higher than the front. If adjustment is required,
adjust 1/8 inch shims on rear castor forks.
Matching Height Of Cut Between Cutting Units
1. Position blade side to side on outside spindle of
both side cutting units. Measure from the floor
to the tip of the cutting edge on both units and
compare. These numbers should be within 1/8 inch
(3 mm) of each other. Make no adjustment at this
time.
2. Position blade side to side on inside spindle of side
cutting unit and corresponding outside spindle of
front cutting unit. Measure from the floor to the tip
of the cutting edge on inside edge of side cutting
unit to corresponding outside edge of front cutting
unit and compare.
Note: The side cutting unit castor wheels should
remain on the ground with counterbalance applied.
Note: If adjustments need to be made to match the
cut between the front and side cutting units, make
the adjustments to the side cutting units only.
3. If the inside edge of the side cutting unit is too high
relative to the outside edge of the front cutting unit,
remove one 1/8 inch shim from the bottom of
the front inside castor arm on the side cutting unit
(Figure 32 and Figure 33). Recheck measurement
between outside edges of both side cutting units
and inside edge of side cutting unit to outside edge
of front cutting unit.
4. If inside edge is still too high, remove an additional
1/8 inch shim from bottom of front inside castor
arm of the side cutting unit and one 1/8 inch shim
from the front outside castor arm of the side cutting
unit (Figure 32 and Figure 33).
5. If the inside edge of the side cutting unit is too
low relative to the outside edge of the front cutting
unit, add one 1/8 inch shim to the bottom of the
front inside castor arm on the side cutting unit
(Figure 32 and Figure 33). Check measurement
between outside edges of both side cutting units
and inside edge of side cutting unit to outside edge
of front cutting unit.
6. If inside edge is still too low, add an additional 1/8
inch shim to the bottom of front inside castor arm
of the side cutting unit and add one 1/8 inch shim
to the front outside castor arm of the side cutting
unit.
7. Once cutting height matches at the edges of front
and side cutting units, verify that side cutting unit
pitch is still .300 inch (7.6 mm). Adjust as necessary.
33