Great Plains 2S-2600F Operator Manual v2 - Manual (Page 39)

37
Section 3 Adjustments
9/26/13 2S-2600 and 2S-2600F Two-Section Folding Drill 195-200M-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.)
NOTE: To run the drill on tractors with open-center hydrau-
lics 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 information.
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 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.
2. Turn knob on pressure-control valve, see Figure 3-15.
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
IMPORTANT: Tractors with load-sensing hydraulics
must use the bypass valve to operate the 2600-3S. Fail-
ure to use the bypass valve can cause major tractor
damage. Before adjusting opener down pressure, set
bypass valve as explained under Setting the Bypass
Valve, page 16.
The following chart shows the approximate force at the
openers for a given pressure at the pressure control valve.
NOTE: To account for additional compaction from drill and
tractor tires, set pressure on inside openers slightly higher
than outside openers.
Gauge
Setting
Pounds Force at Opener Disks
6 inch rows 7 1/2 inch rows 10 inch rows
200 PSI 130 135 144
300 PSI 136 144 155
400 PSI 143 152 167
500 PSI 148 160 179
600 PSI 154 167 189
700 PSI 157 172 196
800 PSI 161 178 205
900 PSI 166 184 213
1000 PSI 171 190 223
1100 PSI 172 194 228
1200 PSI 180 203 240
1300 PSI 184 208 248
1400 PSI 189 215 258
1500 PSI 193 220 264
1600 PSI 198 227 274
1700 PSI 202 232 281
1800 PSI 209 240 291