Great Plains NP30A 30-foot Operator Manual - Manual (Page 51)

Great Plains Manufacturing, Inc. Table of Contents Index Applicator Operating Instructions 47
2014-05-20 Table of Contents Index 407-502M
2013+ NP40A 2P Fold/Lift Circuit
On 2-point 5-section NP40A applicators made in 2013 or
later, the fold and lift cylinders share a single hydraulic
circuit. Solenoid valves (controlled by a switch box), one
or more passive valves, and mechanical locks control
hydraulic sequencing.
This system design provides a partial fold, as a single
self-limiting hydraulic operation, during field lift, providing
extra wing clearance in field turns.
If the hydraulic harness is not connected at the hitch, or
the switch box is off, or power is off, most valves default
to an Open state.
FOLD / FIELD Switch
Refer to Figure 30 (depicting the switch in PARK)
This switch is mounted in the tractor cab (page 154), and
connected to the applicator at the hitch. It controls
several solenoid valves on the applicator. It has three
toggle positions and two indicator lamps.
Note: The switch is powered by the tractor. An illuminated
lamp indicates power sent to the harness. The
harness must be connected at the hitch for the
function to be effected.
Switch Positions
PARK All solenoid valves are powered off and are
spring-loaded to flow-open positions.
Use this position only for parking, to save
tractor battery power. With the switch in PARK,
any hydraulic flow to the fold/lift circuit may
have undesired results.
FOLD
UNFOLD Full fold and unfold sequence is controlled.
Down-pressure is disabled.
During unfold, the inner wings unfold before
the outer wings. During fold, the outer wings
fold before the inner wings. Fold range from
fully folded to wings level (excepting
down-pressure) is available.
FIELD Outer wings locked.
Inner wing fold restricted to “gull wing”.
Down-pressure available.
Use this position in the field. It engages the
down-pressure circuit for weight transfer.
It provides a partial fold for extra wing
clearance in field turns.
Figure 30
FOLD / FIELD Switch
34918
Machine Damage Risks:
Lift/lower (except field lift) and fold/unfold operations are
possible with the hydraulic harness off, but care must be
exercised. It is possible to lower below level, which can result
in row unit ground strikes and dragging.