Great Plains NP4000 40-foot Operator Manual - Manual (Page 60)

56 NP4000 Table of Contents Index Great Plains Manufacturing, Inc.
407-776M Table of Contents Index 2012-03-28
Weight Transfer Adjustment
Weight Transfer Safety Information
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
attention from a physician familiar with this type of injury.
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
settings, cylinders can lift wheels sufficiently for them to spin.
2012+ Weight Transfer System
Applicators made in 2012 and later have two valve
bodies and one gauge for the weight transfer system.
2011 applicators, described on page 58, have a single
body with two gauges.
Refer to Figure 37 and Figure 40 (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 diagram on page 107. 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 closed, 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.
Figure 37: 2012+
Fold/Weight Transfer System
34093
1 2
3
1
2 3
1
2
3