Great Plains NP4000 40-foot Operator Manual - Manual (Page 62)

58 NP4000 Table of Contents Index Great Plains Manufacturing, Inc.
407-776M Table of Contents Index 2012-03-28
2011 Weight Transfer System
Refer to Figure 39 and Figure 40
Wing fold cylinders can extend, during field operation,
to push the wings down using mainframe/center weight.
Weight transfer is controlled by three adjustment valves
at a valve block ( ). See circuit diagram on page 108.
The fold circuit is set to continuous flow (in unfold mode)
to maintain the active weight transfer.
A bypass valve returns excess oil to the tractor.
Pressure reducing valves for the inside wings and
outside wings controls the flow to the cylinders
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
gauge during early field operations.
Figure 39: 2011
Fold/Weight Transfer System
34135
1
1
2
4
6
Figure 40
Weight Transfer Valves
32353
4
1
2
6