Checking The Mismatch Between Cutting Units - Toro 31598N 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 345 kPa (50
psi) and the rear tires is 207 kPa (30 psi).
3. Check and adjust all castor tire pressures to 345 kPa
(50 psi).
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 2 m (6 foot) 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 7.5 mm (.300 inch)
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 3 mm (1/8 inch) 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
33 and Figure 34). 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
33 and Figure 34).
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
and Figure 34). 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 7.6 mm (.300 inch). Adjust as necessary.
1. Tensioning cap
2. Spacers (4)
3. Shims (2 top and 2 bottom)
32
(Figure 33
Figure 33
4. Top axle mounting hole
5. Castor wheel
(Figure
(Figure