Great Plains NP30A 30-foot Operator Manual - Manual (Page 94)

90 NP30A or NP40A Table of Contents Index Great Plains Manufacturing, Inc.
407-502M Table of Contents Index 2014-05-20
2013+ 5-Section Weight Transfer
For 3-Section and 2012- 5-Section, see page 88.
See important safety information on page 87.
Refer to Figure 71 and Figure 70 on page 89
Inner wing fold cylinders can extend, during field
operation, to push the wings down using mainframe/
center weight. Weight transfer is enabled by:
1. Set the FOLD / FIELD switch to FIELD.
2. Adjust the weight transfer valve .
The fold/lift circuit is set to continuous flow (in unfold
mode) to maintain the active weight transfer. This system
is designed for use with tractors having closed center
hydraulics. It is incompatible with open center systems.
Note: Do not set or adjust the weight transfer system if
the outer wings are not level with the inner wings at
unfold. Do not use the weight transfer system to
compensate for unfold stop adjustment issues. See
“Unfold Stop Adjustment” on page 122.
Adjust the weight transfer to achieve consistent coulter
depth, while keeping the wings level with the center
section. If insufficient weight is transferred, outside
(wing) coulters may run higher than center section. If too
much weight is transferred, center section may run high.
If adjusted when the tractor is cold, re-adjustment may
be required when the oil warms. Monitor the pressure
gauges during early field operations.
Refer to Figure 70
1.
In field conditions, unfold applicator (page 58).
2. Set FOLD / FIELD to FIELD.
3. Lower applicator(page 48), and set or check
application depth (page 37).
4. Pull forward to put coulters in ground.
5. Put tractor in Park and set parking brake.
6. Set tractor to half throttle. Extend the fold/lift circuit
(unfold). Lock lever for continuous operation.
7. Adjust tractor flow control valve so bypass gauge
needle is in the green zone (1000 to 1500 psi).
8. Release the lock disc .
9. Adjust the knob for an initial value of 800 psi on
the gauge . Tighten the lock disc.
10. Check that bypass gauge is still in the green zone.
Adjust the tractor remote flow to correct. Re-check
the reading on the pressure-reducing gauge
.
11. Observe applicator operation, and re-adjust
down-pressure as necessary after oil warm-up.
Repeat step 7 through step 10.
Figure 71
Fold/Weight Transfer System
34957
1
1
858-042C Rev. A
NOTICE
This machine is designed for continuous
hydraulic flow to the wing fold cylinders
during field operations. It is for use on
tractors having CLOSED CENTER
hydraulics only.
Engage the hydraulics (continuous flow) down. 1.
2. From the cab, adjust the flow so the needle
on the bypass gauge is in the green zone
1000 to 1500 PSI.
3. At the valve, adjust the valve to set your
initial down pressure.
If the wings run high during operation, increase
pressure. if the center runs high, decrease
pressure.
4.
SETTING DOWN PRESSURE VALVE
DOWN PRESSURE VALVE INSTRUCTIONS:
NUTRI-PRO ®
Figure 72
Weight Transfer Adjustment
34935
3
4
5
1
2
2
6
7
5
2
5