NTA907HD and NTA3007HD
Adjustments
Great Plains
| 166-207M | 02/26/2019
87
4.
Release locking disks on transfer
, center
and
wing
down-pressure valves.
5.
Adjust knobs on pressure-control valves
, for
opener down pressure until gauges
, are at
9.7 bar (1400 psi).
The recommended down-pressure ranges for drilling are:
Rotate knob clockwise to increase pressure and
counterclockwise to decrease pressure.
6.
In some applications, pressure on center section is
set slightly higher than the wings to account for
additional compaction due to tractor and drill
transport tires. Do not operate at pressures so high
that the wing gauge wheels loose traction, or are off
the ground, causing loss of seed depth control.
Setting the Bypass Valve
•
LS Closed:
Tractors with load-sensing, Closed-Center hydraulics
require the bypass valve
to protect the tractor
hydraulic system. Continue at “
•
PFC Closed:
Pressure Flow Compensating - same adjustment as
LS Closed. Continue at “
•
PC Closed:
Pressure Compensating - no bypass is required.
Release locking disk. Close bypass valve
for no oil
flow by turning knob clockwise completely. Tighten
locking disk. Always operate the drill with the bypass
valve locked closed.
•
Open Center (OC):
The NTA907HD and NTA3007HD drills are not
presently compatible with tractors that have Open-
Center hydraulics.
If you are unsure what type of hydraulic system is on your
tractor, contact your tractor manufacturer.
Center
4.8 to 14.5 bar (700 to 2100 psi)
Wings
5.5 to 15.2 bar (800 to 2200 psi)
Figure 92
Down-Pressure Adjustment
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Содержание NTA3007HD
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