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3. Operation
3.2.5 Row Unit Down Pressure
A hydraulic cylinder (1) applies row unit down pressure
on each row unit (2). The cylinders apply a constant down
pressure through the full range of movement of the row
unit. An active hydraulic circuit maintains uniform pres-
sure to each hydraulic cylinder.
Use the row unit down pressure control box to set the
row unit down pressure. The row unit down pressure can
be adjusted from 1034 to 17237 kPa (150 to 2500 psi).
Set the row unit down pressure high enough for correct
cutting coulter and shank opener penetration and correct
soil compaction. The row unit down pressure adjustment
will change with field conditions, speed depth, soil type,
and ground speed.
Operate the tractor hydraulic remote that the row unit
down pressure is connected to at full output or fully open.
Operating the hydraulic remote at full output reduces the
back pressure on the row unit down pressure return lines.
3.2.6 Down Pressure Control Box
Use the down pressure control box to adjust the down
pressure on each of the row units
Find the following components on the down pressure
control box.
•
LCD read out (1) the LCD readout displays the row
unit down pressure in pounds per square inch (psi)
system hydraulic pressure.
•
Mode switch (2) The mode switch is a three position
switch. The mode switch is used as a power switch
and to switch between setting down pressure on (4)
and off (2 and 5).
•
Adjustment knob (3) The adjustment knob is used to
set the row unit down pressure.
Precision Shank Drill
Operators Manual - 74356-02
3.2.7 Setting the row unit down pressure
The row unit down pressure is set in the field. Before the
row unit down pressure can be set, transport the drill to
the field and prepare the drill to plant
1.Operate the drill in the field.
2. Stop the tractor. Stop the engine, apply the tractor
parking brake, and take the ignition key with you.
3. At the rear of the drill, inspect the tracks made by the
packing tires.
If the track is very light or not present, in
crease the row unit down pressure.
If the track is too deep and the soil is too
compacted, decrease the row unit
down pressure.
4. Operate the drill in the field and check the results of
the adjustment. Continue to adjust the row unit down
pressure until the packing tire compacts the soil correct-
ly.
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