Great Plains 3S-3000HDF Operator Manual v1 - Manual (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Index Preparation and Setup 21
2014-07-01 Table of Contents Index 195-441M
Refer to Figure 11 on page 20 and Figure 12 at right
4.
Release locking discs on down-pressure valves.
Adjust knobs on pressure-control valves for
opener down pressure so gauges are at:
1800 psi for 3S-3000/F models
2100 psi for 3S-3000HD/HDF models
5. While watching gauges on drill, slowly turn knob on
bypass valve counterclockwise. Adjust bypass valve
just until needles on gauges begin to move down
from 1800 psi (2100 psi for heavy duty models). Lock
bypass valve at this setting. (See also note below.)
6. Re-adjust pressure-control valves on drill to desired
opener down pressure as explained under See
“Opener Frame Down-Force” on page 50.
Note: The higher the bypass pressure, the greater the
potential for oil heating and premature tractor
damage. At the same time, for proper opener
operation the bypass valve must be set at least 300
psi above the opener down-pressure setting when
the tractor is at one-half throttle. Therefore, you
should set the bypass valve as low as possible
while staying at least 300 psi above the opener
down pressure setting.
While 1800 psi (2100 psi for heavy duty models) is a
good starting point for setting the bypass valve, if you
consistently operate the drill with low opener down
pressure you can set the bypass valve below 1800 psi
(2100 psi for heavy duty models). If you consistently
operate the drill with very high opener down pressure,
you may need a bypass-valve setting above 1800 psi
(2100 psi for heavy duty models).
End of Preparation and Setup
FigureSpacer
Figure 12
Down Pressure for Bypass
26471
4
5
6
5
6
4