Great Plains 3S-5000HDF Operator Manual - Manual (Page 33)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 29
2012-08-14 Table of Contents Index 195-325M
Active Hydraulic Systems
Equipment Damage Risk:
Tractors with load-sensing hydraulics must use the bypass
valve to operate the 3S-5000. Failure 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” on page 26.
1. Lock hydraulic lever forward during field operation for
constant hydraulic flow to 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
purchase 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 continuous. Push lever forward until detent
clicks.
Case-IH Magnum tractors:
Lock lever forward in detent position. You may need to
turn up detent pressure 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 forward. See your tractor
dealer for proper means of providing constant flow to
openers.
Refer to Figure 21
2.
With tractor hydraulic lever locked forward and
openers in field position, set down pressure with
adjustment knob. Watch pressure gauge and dial in
desired pressure on openers. There is one
pressure-control valve for openers on center section
and one for openers on wing sections of drill.
Note: Rotate knob clockwise to increase pressure and
counterclockwise to decrease pressure.
3. Once pressure is set, lock each knob with lock disk.
4. In some typical applications, pressure on center
section is set slightly higher that the wings to
account for additional compaction from drill transport
tires and tractor tires. The recommended pressure
range for drilling is between 200 psi and 1600 psi.
For drills without markers: Setting opener down
pressure above 1600 psi. will raise drive wheels off
the ground when the seed box is empty causing
skips and poor seed metering.
For drills with markers: Setting opener down
pressure above 2300 psi. will raise drive wheels off
the ground when the seed box is empty causing
skips and poor seed metering.
5. For more information on adjusting hydraulic down
pressure, see “Hydraulic Down Pressure All
Openers” on page 46.
During operation always raise openers before turning.
Never back up or turn sharply with openers in the
ground. Doing so will plug openers and may damage
equipment.
Figure 21
Pressure Control Valves
34293
Adjustment
Knob
Lock Disk