Active hydraulic systems – Great Plains 3S-4000HDF Operator Manual User Manual
Page 39
Great Plains Manufacturing, Inc.
Operating Instructions
35
2013-06-13
195-067M
Active Hydraulic Systems
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 28
2.
With tractor hydraulic lever locked forward and
openers in field position, release lock disk
and 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, set knobs with lock disks
.
4.
In some applications, pressure on center section is
set slightly higher than the wings to account for
additional compaction from drill transport tires and
tractor tires. The recommended pressure range for
drilling is between 1200 psi and 1800 psi.
Crop Population Risk:
Do not operate at pressures so high that the gauge wheels
loose traction, or are off the ground, resulting in skips and
poor seed metering.
5.
For more information on adjusting hydraulic down
pressure, see “Setting Hydraulic Down-Pressure”
on page 59.
Equipment Damage Risk:
Tractors with load-sensing hydraulics must use the bypass
valve to operate the 3S-4000HD/HDF. 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 22.
Equipment Damage Risk:
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 28 - Active
Pressure Control Valves
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