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Operating Speed
The operating speed is very significant to the
performance of the HSL. It requires some speed to make
it work correctly and efficiently.
1. The minimum operating speed should be
approximately 7-1/2 to 8 miles per hour unless the
goal is to minimize the percent of crop residue being
buried.
2. Maximum operating speed recommended is
approximately 12 miles per hour.
The amount of crop residue that is buried is a function of
the operating speed.
•
The higher the speed of operation of the HSL, the
greater the percent of crop residue that will be buried.
•
The slower the speed of operation of the HSL, the
greater the percentage of crop residue left on the
surface.
When operating the HSL, higher speed can be a
substitute for operating deeper. On the other hand, in
some cases, it is desirable to reduce the percentage of
crop residue buried. In such cases the operator will need
to reduce the speed of operation. Typically the 8 to 10
miles per hour window of operating speed will yield the
most desirable results.
Wing Hydraulic Down
Pressure
The 7833 HSL comes equipped with hydraulic wing down
pressure. The hydraulic wing down pressure is
incorporated in the wing fold system. The hydraulic wing
down pressure transfers weight from the heavier center
section out into the outer portions and tips of the wing
assemblies. The wing down pressure system assures
that the active down force each disc unit is equal. The
hydraulic wing down pressure manifold is located on the
left side of the hitch, just inside the frame.
The hydraulic wing down pressure system needs to be
run continuously when the 7833 HSL is working in the
field.
•
It is recommended that the wing fold circuit (coded
with the yellow hose wrap) be connected to a tractor
circuit in which the flow has been reduced to
approximately twenty percent (20%) of its full
capacity.
•
Turning the flow volume down will supply an
adequate flow to the down pressure system and
simultaneously prevent excessive buildup of heat or
loss of power.
•
The down side to turning the flow down is that the
fold and unfold functions will be slowed down.
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The wing down pressure is a function of geometry and a
"set it and forget it" setting. The design intent of the
hydraulic wing down pressure is to evenly distribute the
weight of the heavier center section evenly across the
entire machine. For that reason adjusting the down
pressure is not recommended. It has been correctly set
at the factory. The pressure setting is adjustable;
however, the maximum pressure should never exceed
1500 psi (the cylinder rods are subject to buckling above
1500 psi). If adjustment becomes necessary, loosen the
lock nut on the "PRV" cartridge and adjust it clockwise for
higher pressure and counter clockwise for lower
pressure. Please reference the following table for the
recommended settings.
7833 Hydraulic Wing Down Pressure Settings
Model
7833-25
7833-30
7833-35
7833-40
Operating Depths and
Adjustments for
Conventionally Operated
HSL
The conventionally operated HSL has two (2) single point
depth controls, one for the front row of disc units and one
for the rear row of disc units.
As previously discussed, the front row depth setting is
adjusted independently of the rear. The relationship
between the front and rear will determine if the HSL
tracks straight behind the tractor. Typically the two will
not be set the same. Operating the conventional HSL
requiring balancing the front and rear operating depths to
make the HSL track straight. The front and rear depth
settings not only control operating depths, but the
tracking as well.
•
Both depth gauges are independently adjustable.
•
Both have their deepest setting correlate to the
gauge cylinders being completely retracted. Typically
the front gauges will need to be set slightly deeper
than the rear because the front disc row is doing
more work than the rear is.
IMPORTANT
Do not be concerned when the front and rear gauge
indexes are set differently for optimum operation.
OPERATION AND MAINTENANCE
Hydraulic Wing Down Pressure Settings
450 psi
650 psi
875 psi
1,150 psi
See Figure 4-6
4-9
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