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Adjusting the Cutting-Unit
Pitch
Measuring the Cutting-Unit Pitch
Mower-deck pitch is the difference in height-of-cut
from the front of the blade plane to the back of the
blade plane. Use a blade pitch of 8 to 11 mm (5/16 to
7/16 inch). That is the back of the blade plane is 8 to
11 mm (5/16 to 7/16 inch) higher than the front.
1.
Position the machine on a level surface on the
shop floor.
2.
Set the cutting unit to the desired height of cut.
3.
Rotate a blade to point straight forward.
4.
Using a short ruler, measure from the floor to
the front tip of the blade.
5.
Rotate the blade tip to the rear and measure
from the floor to the tip of the blade.
6.
Subtract the front dimension from the rear
dimension to calculate the blade pitch.
Adjusting the Center Cutting-Unit
Pitch
1.
Loosen the jam nuts on the top or bottom of the
height-of-cut-chain U-bolt
2.
Adjust the other set of nuts to raise or lower the
rear of the mower deck and attain the correct
mower-deck pitch.
3.
Tighten the jam nuts.
Figure 123
1. U-bolt
(Figure
123).
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2. Height-of-cut chain
Adjusting the Wing Cutting Units
1.
Remove the cap screws and nuts securing the
caster arm to the caster fork
2.
Position the shims, as required, to raise or lower
the caster wheel until the cutting unit has the
correct pitch.
3.
Install the cap screws and nuts.
1. caster arm
2. Shims
Servicing the Caster-Arm
Bushings
Removing the Bushings
The caster arms have bushings pressed into the
top and bottom of the tube and after many hours of
operation, the bushings develop wear. To check the
bushings, move the caster fork back and forth and
from side to side. If the caster spindle is loose inside
the bushings, replace the bushings.
1.
Raise the cutting unit so that the wheels are off
the floor and block the cutting unit so it cannot
fall.
2.
Remove the tensioning cap, spacer(s), and
thrust washer from the top of the caster spindle.
3.
Pull the caster spindle out of the mounting tube.
Note:
Keep the thrust washer and spacer(s) on
the bottom of the spindle.
4.
Insert a pin punch into the top or bottom of the
mounting tube and drive the bushing out of the
tube
(Figure
125).
84
(Figure
124).
Figure 124
3. caster fork
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