GREAT PLAINS NTA3007HD, Operator'S Manual

Page: 92 / 178

Great Plains | 166-207M | 02/26/2019 Table of Contents Index 86
NTA907HD and NTA3007HD Table of Contents Index Adjustments
Control Valve Overview
Refer to Figure 91
There is one flow control, and three pressure controls.
Each pressure control has a gauge. All of the controls
have an adjustment knob
and a locking disk to fix
the chosen setting.
These controls must be set and adjusted prior to first field
use of the drill. They require re-adjustment when there
are significant changes in field conditions.
1. Unfold (page 26) and lower (page 32) drill. Put
tractor in Park and set parking brake.
2. 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
3. At bypass valve , release locking disk and close
bypass valve for no oil flow by turning knob clockwise
completely.
Bypass valve (normally closed),
adjusted on tractors with “LS closed” hydraulics
,
Center section down-pressure,
sets the force applied to all center section rows, and
may be set higher than wings
,
Wing down-pressure,
sets the force applied to all wing rows, and may be set
lower than the center section.
,
Transfer of weight from center to wings,
sets the weight available to the wings. At higher wing
down-pressures, it is possible for the rows to lift the
wings, unless weight is transferred.
Figure 91
Down-Pressure Valve Block
29422
W
C
T
B
k
r
w
c
t
Crushing and High Pressure Fluid Hazards :
This adjustment requires working near the unfolded and
lowered drill with the hydraulic system active. Assign two
people to this task, one in the tractor cab, ready to shut the
tractor down on hand signal from adjuster or any unplanned
event.
k r
B
C c
W w
T t
B