Great Plains NP30A 30-foot Predelivery Manual - Manual (Page 36)

407-313Q Table of Contents Index 08/30/2011
32 NP30 or NP40 Table of Contents Index Great Plains Manufacturing, Inc.
Final Setup
Set Rough Weight Transfer
This topic applies only to NP30L and NP40L conven-
tional liquid fertilizer models. For anhydrous models, con-
tinue at “Lift-Assist Valve Setup” on page 34.
Crushing and High Pressure Fluid Hazards:
This adjustment requires working near the unfolded and
lowered implement with the hydraulic system active. Assign
two people to this task, one in the tractor, ready to shut down
on hand signal from adjuster or any unplanned event.
High Pressure Fluid Hazard:
Escaping fluid under pressure can penetrate the skin causing
serious injury. Use a piece of paper or cardboard, NOT BODY
PARTS, to check for suspected leaks. Wear protective gloves
and safety glasses or goggles when working with hydraulic
systems. If an accident occurs, seek immediate medical atten-
tion from a physician familiar with this type of injury.
Refer to Figure 44 and Figure 45 (depicting NP3000)
Wing fold cylinders can extend, during field operation,
to push the wings down using mainframe/center weight.
Weight transfer is enabled by opening the weight-transfer
shut-off valve
, and controlled by two adjustment
valves ( and ). See circuit diagrams on page 40
through page 42.
The fold circuit is set to continuous flow (in unfold mode)
to maintain the active weight transfer.
The weight-transfer shut-off valve must be open for
weight transfer. When open, it bypasses the reducing
valve
for faster fold cylinder operation (and faster 2-
point lift-assist).
The pressure reducing valve controls the flow to the
cylinders.
The bypass valve returns excess oil to the tractor.
Note: On 2-point implements, fold and unfold are followed
by lift and lower operations.
Figure 44
2P Weight Transfer
31578
Crushing Hazard:
Keep body parts clear of wings, row cleaners and coulters
while adjusting. Keep all bystanders well away. You will be
seriously injured or killed if you are caught between lowering
row implements and ground.
Falling Hazard - Tires Not a Step:
Do not use tires as steps or platforms. At some transfer set-
tings, cylinders can lift wheels sufficiently for them to spin.
1
3
2
4
2
3 4
Figure 45
Weight Transfer Valves
32041
3 4
2
2
3
3
4