Great Plains 3S-3000F Operator Manual v2 - Manual (Page 29)

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Section 2 Operating Instructions
11/9/07 3S-3000 Three-Section Folding Drill 195-110M-A
Great Plains Mfg., Inc.
Field Operation
The openers are mounted on floating opener frames
which follow the contour of the ground while maintaining
constant opener down pressure. To achieve the designed
opener flotation the opener hydraulic circuit must be pow-
ered by an active hydraulic system. An active hydraulic
system requires a tractor with closed-center hydraulics or
pressure/flow compensated hydraulics which are powered
by a variable-displacement hydraulic pump.
To run the drill on tractors with open-center hydraulics or
on tractors with fixed-displacement hydraulic pumps re-
quires a kit (Great Plains part number 194-143A). Refer to
Non-Active Hydraulics on page 28 for adjusting a drill with
Non-Active Hydraulics.
Active Hydraulic System
(Tractors with closed-center hydraulic systems and
variable-displacement hydraulic pumps)
1.
Lower the opener frames by pushing FORWARD on
the tractor remote hydraulic lever. The remote lever
must be LOCKED OPEN in this position to provide
constant pressure/flow to the openers.
John Deere tractors with Sound-Gard ® Body: Use
lever lock clip, John Deere part number R52667, to
lock lever forward. See your tractor dealer for clip pur-
chase and installation.
John Deere 7000 Series tractors: Rotate valve
detent selector to motor position to lock lever in for-
ward position.
John Deere 8000 Series tractors: Set timer to con-
tinuous. Push lever forward until detent clicks.
Case-IH Magnum tractors: Lock lever forward in
detent position. You may need to turn up detent pres-
sure to its maximum setting. Do not tie hydraulic lever
past detent position with a strap. See your tractor
dealer for hydraulic-system details.
Other tractors: Lock lever forward in detent position.
You may need to turn up detent pressure to maximum
or use a mechanical detent holder to hold lever for-
ward. See your tractor dealer for proper means of pro-
viding constant flow to openers.
IMPORTANT: Tractors with load-sensing hydraulics
must use the bypass valve to operate the 3S-3000.
Failure to use the bypass valve can cause major trac-
tor damage. Before adjusting opener down pressure,
set bypass valve as explained under Setting the By-
pass Valve, page 26.
2. With the tractor hydraulic lever locked forward, turn the
knob on the pressure control valves as shown in Fig-
ure 2-9. Watch the pressure gauge and dial in the de-
sired pressure on the openers. Clockwise increases
the pressure and counterclockwise decreases pres-
sure. Once the pressure is set, lock each knob with
the lock disk. There is one pressure control valve for
the center section, and one for the wing sections. In
some typical applications, the pressure on the center
section is set slightly higher than the wings to account
for additional compaction from the drill transport tires
and tractor tires. The recommended pressure range
for drilling is between 200 psi and 1200 psi. Setting the
opener down pressure above 1600 psi. will raise the
drive wheels off the ground when the seed box is emp-
ty causing skips and poor seed metering. See Plant-
ing Adjustments in the “Adjustments” section
starting on page 38 to convert hydraulic pressure at
the gauge to opener down force.
Pressure Control Valves
Figure 2-9
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