Great Plains 2S-2600HDF Operator Manual v2 - Manual (Page 67)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 63
2014-02-03 Table of Contents Index 195-069M
Setting Hydraulic Down-Pressure
1. Lower openers to the ground. Lock hydraulic lever
forward for constant hydraulic flow.
You must lock hydraulic lever forward. See “Opener Opera-
tion” on page 32.
Refer to Figure 59
2.
Release lock disk . Turn knob on pressure-con-
trol valve while watching pressure gauge, turn knob
until gauge shows desired pressure. Turn clockwise
to increase pressure. Turn counterclockwise to
decrease pressure.
There is one pressure-control valve for inboard wing
cylinders (“CENTER SECTION”) and one for out-
board wing cylinders (“WING SECTIONS”). If the
Point Row option is installed, the controls are for
entire Left or Right wings, and the decals read
“LEFT” and “RIGHT”.
Refer to the chart on page 62 for approximate force
at the openers for a given pressure setting. As a gen-
eral starting point, set hydraulic down pressure to
1400 psi. Bypass valve (page 19) must be set to at
least 100 psi above down-pressure setting. For most
field conditions, adjust down pressure between 1200
and 1800 psi.
Inconsistent 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.
3. Once pressure is set, lock knob with lock disk. If
using a non-active hydraulic system to run drill,
unlock the hydraulic remote lever and return it to
neutral.
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 for-
ward on these tractors can cause overheating of hydraulic oil
and tractor damage. After setting opener down pressure,
always return hydraulic lever to neutral.
Figure 59
Down-Pressure Valves
26477
1
2
1 2