Great Plains 3S-3000HDF Operator Manual v2 - Manual (Page 55)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 51
2014-02-11 Table of Contents Index 195-068M
Hydraulic opener down pressure controls drill-wide
opener penetration and press-wheel soil firming. Use
only enough down pressure to cut a furrow and maintain
proper soil-firming over seed. Excessive opener down
force may cause bulldozing of the openers in light soil
conditions, and leads to premature wear on opener
components.
The table at right shows the approximate force at
openers for a given pressure at the pressure control
valve.
Note: To account for additional compaction from drill and
tractor tires, set pressure on center openers slightly
higher than wing openers.
To run the drill with constant opener down pressure
requires an Active Hydraulic System. An Active Hydraulic
System requires a tractor with closed-center hydraulics
or pressure/flow compensated hydraulics powered by a
variable displacement hydraulic pump. (If you are not
familiar with your tractor’s hydraulics, consult your tractor
dealer.)
Machine Damage Risk: Tractors with load-sensing hydraulics
must use the bypass valve to operate the 3S-3000HD. Failure
to use the bypass valve can cause major tractor damage.
Before adjusting opener down pressure, set bypass valve per
“Setting the Bypass Valve” on page 20.
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 num-
ber 194-143A. Contact your Great Plains dealer for
ordering information. See “Non-Active Hydraulic
System” on page 33.
Pounds of Force at Opener Disks
Gauge
Setting
Row Spacing
6in 7.5in 10in
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
1900 PSI 213 247 300
2000 PSI 217 253 309
2100 PSI 222 260 318
2200 PSI 227 266 327
2300 PSI 232 273 336