Priority flow hydraulic systems, Non-active hydraulic system – Great Plains 2S-2600HDF Operator Manual v1 User Manual
Page 37
Great Plains Manufacturing, Inc.
Operating Instructions
33
2014-05-16
195-440M
Priority Flow Hydraulic Systems
On some tractors with load-sensing hydraulics, the circuit
#1 is capable of taking nearly 100 percent of available
hydraulic flow. Operating the openers or markers on
circuit #1 will starve the other circuit, making one function
inoperable.
To operate markers and constant opener down pressure
at the same time, connect the openers to circuit #2 and
the markers to circuit #3.
Non-Active Hydraulic System
To run drill with open-center hydraulics or
fixed-displacement hydraulic pumps requires a Great
Plains kit, part number 194-143A. After installing the kit,
refer to the following instructions for opener operation.
1.
Lower opener frames by pushing forward on tractor
hydraulic lever. Lock lever temporarily in this position
while adjusting opener down pressure.
Refer to Figure 30
2.
With tractor hydraulic lever locked forward, 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 inboard openers (“CENTER”) and one for
outboard openers (“WING”). If the Point Row option
is installed, the controls are Left (“LEFT”) and Right
(“RIGHT”).
Note: Rotate knob clockwise to increase pressure and
counterclockwise to decrease pressure.
3.
Once pressure is set, set knobs with lock disks
.
4.
After opener down pressure is set, return tractor
hydraulic lever to neutral. This locks-in the selected
pressure, and opener frames remain fixed in this
position.
Equipment Damage Risk:
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 hydraulic lever to neutral.
Note: The goal is to have the openers running level.
Begin by setting the machine so the openers are
level.
Adjust the down pressure. See if the openers are
still level.
If the nose is up, increase pressure.
If the rear is up, decrease pressure.
Figure 30 - Non-Active
Pressure Control Valves
26477
1
2
1
2
1