Great Plains NTA2007 Operator Manual - Manual (Page 93)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 89
2012-01-05 Table of Contents Index 166-372M
Diverter Vane Adjustments
Refer to Figure 67 (and Figure 51 on page 58)
On dual-hopper drills, where the material in each hopper
differs, the meters may require substantially different air
flows. Dual pressure gauges, and a diverter vane
are
provided for setting unequal flows.
An example of a situation likely to need unequal flow is:
small light seeds in hopper I, and
dense dry fertilizer in hopper II.
The need for unequal flows may be observed only during
actual field operation, as material must be entering the
airflow and generating air demand.
Diverter Operation
The vane (not shown) inside manifold is attached to a rod
with a handle
on the bottom end, and a nut (not
shown) at the other end of the rod on top of the manifold.
The factory setting for the handle is pointing straight
forward, providing balanced flow to each meter. Decals,
on manifold top and bottom, show the approximate angle
of maximum effect.
To adjust the vane:
• Loosen the top nut.
• Turn the handle to point
toward the side where reduced flow is desired, and
away from the side where increased flow is desired.
• Tighten the top nut.
Diverter Tuning Steps
1.
Start with:
2. Begin field operations. Watch for delivery issues that
might be remedied by an uneven flow, such as
blockage, pressure alarms and seed
cracking/bounce.
3. Adjust fan rpm up and down until you discover the
upper and lower rpms that represent the optimal
working range for each meter. Note the upper and
lower the manifold pressures for that operating
range. The ideal (median) pressures for each meter
are likely to be different.
4. If there is no single fan speed that puts both meters
comfortably within their ideal operating range, set the
fan to an averaged median rpm, and begin adjusting
the diverter vane. The goal is to bring both pressure
gauges to levels within their optimal range similar to
those determined at step 3.
5. After the final vane setting is made, some fan rpm
adjustment may be needed to bring both gauges to
the median readings in the optimal range.
• moderate fan speeds (see page 87)
• balanced manifold air flow - set/leave the diverter
vane handle straight forward.
Note: Vane is not present on single-hopper drills.
Note: If applying a single material on a single-shoot drill,
Great Plains recommends loading the material
into both hoppers and using half rate (see Seed
Rate Chart Manual for details). Set vane for equal
pressures to each meter.
Note: If applying a single material on a double-shoot drill,
use a single hopper. Set the vane to divert the
maximum flow to the used side (this does not
completely shut off air flow to the unused hopper,
which needs some airflow to avoid nuisance
Figure 67
Diverter Vane Location
31188
3
3
3
Figure 68
Equal Manifold Pressure
31189