Great Plains NP4000 40-foot Operator Manual User Manual
Page 61
Great Plains Manufacturing, Inc.
Adjustments
57
2012-03-28
407-776M
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.
Refer to Figure 39 on page 58 and Figure 38
1.
In field conditions, unfold (page 37), lower implement
(page 35), and set or check application depth
(page 26).
2.
Pull forward to put coulters in ground.
3.
Put tractor in Park and set parking brake.
4.
Open weight-transfer shut-off valve
5.
Release the bypass valve lock disc
. Turn the
bypass valve knob
fully clockwise to shut-off all
bypass oil flow. Tighten lock disc.
6.
Set tractor to half throttle. Adjust tractor flow control
valve so that wings fold/unfold at a reasonable
speed. Keep tractor running for step 7 through
step 10.
Note: On 2-point implements, fold and unfold are followed
by lift and lower operations.
7.
Set tractor remote circuit for unfold. Lock lever for
continuous operation.
8.
At the pressure reducing valve
disc
.
9.
Adjust the knob
for an initial value of 800 psi on
the gauge
. Tighten the lock disc.
10. At the bypass valve
, release the lock disc
.
Adjust the bypass valve knob counter-clockwise until
the pressure reading just begins to fall from the value
set at step 9. Turn the knob clockwise
1
⁄
4
turn.
Tighten the lock disc.
11. Observe implement operation, and re-adjust
down-pressure as necessary after oil warm-up.
Repeat step 7 through step 10. The bypass valve
needs to be closed prior to any adjustment to
increase weight transfer.
Figure 38
Weight Transfer Adjustment
32041
6
5
4
7
8
1
3
5
2
6
7
8
3