Great Plains 2S-2600F Operator Manual v2 - Manual (Page 40)

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Section 3 Adjustments
2S-2600 and 2S-2600F Two-Section Folding Drill 195-200M-A 9/26/13
Great Plains Mfg., Inc.
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.
NOTE: On some tractors with very positive remote hydrau-
lic checks, a slight increase in the reading on the pressure
gauges may occur after the tractor remote lever is re-
turned to neutral. This is caused by back pressure on the
opener cylinders and should be ignored. The NET OPER-
ATING PRESSURE on the opener cylinders is maintained
at the pressure you selected while the tractor remote lever
was held forward, not at the "apparently increased" pres-
sure. Reactivating the tractor lever forward will confirm
this.
Spring Down Pressure – Individual Openers
For planting in tire tracks, you can increase spring pressure
on individual openers. To increase spring pressure, tighten
flange nut at lower end of opener spring. See Figure 3-16.
Each 1/4-inch adjustment adds about 13 pounds of force at
opener disk. Do not tighten nut more than one inch. After
adjusting, lock flange nut in place with jam nut.
Figure 3-16
Individual Opener Pressure Adjustment
IMPORTANT: Open-center tractors and tractors with
fixed-displacement pumps are not designed to provide
a continuous supply of pressurized oil to remote valves.
Locking hydraulic lever forward on these tractors can
cause overheating of hydraulic oil and tractor damage.
After setting opener down pressure, always return hy-
draulic lever to neutral.
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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.
Figure 3-15
Pressure Control Valves
Non-Active Hydraulic System
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 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 posi-
tion.
To set down pressure:
1. Lower opener frames by pushing forward on tractor
hydraulic lever. Lock lever temporarily in this position
while adjusting opener down pressure.
2. Turn knob on pressure-control valve, see Figure 3-8.
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 openers on the
inside of drill and one for openers on the outside ends.
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 1700 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 page 33 for approximate force at the openers
for a given pressure setting.
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