Great Plains 3S-3000F Operator Manual v2 - Manual (Page 43)

41
Section 3 Adjustments
11/9/07 3S-3000 Three-Section Folding Drill 195-110M-A
Great Plains Mfg., Inc.
Active Hydraulic System
To run the drill with constant opener down pressure re-
quires an Active Hydraulic System. An Active Hydraulic
System requires a tractor with closed-center hydraulics or
pressure/flow compensated hydraulics powered by a vari-
able displacement hydraulic pump. (If you are not familiar
with your tractor's hydraulics, consult your tractor dealer.)
IMPORTANT: To run the drill on tractors with open-center
hydraulics or on tractors with fixed displacement hydraulic
pumps you must install a Great Plains kit, part number 194-
143A. Contact your Great Plains dealer for ordering infor-
mation. Refer to Non-Active Hydraulics System on this
page.
To set down pressure:
1. Lower openers to the ground. Lock hydraulic lever for-
ward for constant hydraulic flow.
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 forward
position.
John Deere 8000 Series tractors: Set timer to contin-
uous. 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 deal-
er 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.
2. Turn knob on pressure-control valve, see Figure 3-7.
While watching pressure gauge, turn knob until gauge
shows desired pressure. Turn clockwise to increase
pressure. Turn counterclockwise to decrease pres-
sure.
There is one pressure-control valve for the center sec-
tion and one for the wing sections.
As a general starting point, set hydraulic down pres-
sure to 800 psi. For most field conditions, adjust down
pressure between 200 and 1400 psi. Setting the open-
er down pressure above 1600 psi. will raise the drive
wheels off the ground when the seed box is empty
causing skips and poor seed metering. Refer to the
chart on the previous page for approximate force at the
NOTE: Tractors with load-sensing hydraulics must
use the bypass valve to operate the 4000-3S. Failure
to use the bypass valve can cause major tractor dam-
age. Before adjusting opener down pressure, set by-
pass valve as explained under Setting the Bypass
Valve, page 26.
openers for a given pressure setting.
3. Once pressure is set, lock knob with lock disk.
Non-Active Hydraulic System
To run the drill on tractors with open-center hydraulics or on
tractors with fixed displacement hydraulic pumps requires a
kit (Great Plains part number194-143A). This kit utilizes a
non-active hydraulic system which allows you to pressurize
your openers down and lock in that pressure on level
ground by holding the opener frames in a fixed position.
To set down pressure:
1. Lower opener frames by pushing forward on tractor hy-
draulic lever. Lock lever temporarily in this position
while adjusting opener down pressure.
2. Turn knob on pressure-control valve, see Figure 3-7.
While watching pressure gauge, turn knob until gauge
shows desired pressure. Turn clockwise to increase
pressure. Turn counterclockwise to decrease pressure.
There is one pressure-control valve for the center sec-
tion and one for the wing sections.
As a general starting point, set hydraulic down pres-
sure to 800 psi. For most field conditions, adjust down
pressure between 200 and 1200 psi. Setting the open-
er down pressure above 1600 psi. will raise the drive
wheels off the ground when the seed box is empty
causing skips and poor seed metering. Refer to the
chart on the previous page for approximate force at the
openers for a given pressure setting.
3. Once pressure is set, lock knob with lock disk.
4. After opener down pressure is set, return tractor hy-
draulic lever to neutral. This locks in the selected pres-
sure, and opener frames will remain fixed in this
position.
Pressure Control Valves
Figure 3-7
15557