Great Plains 3PYPA Operator Manual - Manual (Page 69)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 65
03/20/2012 Table of Contents Index 401-647M
Liquid Fertilizer Adjustments (Option)
If installed there are two adjustments for the Great
Plains-provisioned components:
1. Row orifice setup
Orifice plate sizes are chosen to assure consistent
pressure at all nozzles. Refer to the Seed Rate man-
ual.
2. Relief valve setting
See “Fertilizer Row Shut-Off” on page 66.
Great Plains recommends checking with your local
agronomist as soil conditions vary. Soil conditions in your
area may need less or more fertilizer than represented in
these charts. In furrow, do not exceed 12 gallons per
acre in any case.
The liquid fertilizer system is designed to operate (ide-
ally) between 15 and 40 psi, but in no case more than 65
psi. Several system elements affect system pressure,
and need initial setup, periodic maintenance, and adjust-
ment when changing fertilizer rates.
Fertilizer Orifice Plates
Refer to Figure 74
To install, insert the plate
inside the gasket supplied
with the nozzle . Insert the gasketed plate with the leg-
end side facing out the nozzle outlet (typically up).
In general, the orifice needs to be small enough to
create at least 15 psi of pressure in the manifold to oper-
ate the check valves
but large enough to prevent the
manifold pressure from exceeding 65 psi.
The minimum pressure is required to even out the flow of
fertilizer between rows. To reduce orifice plugging and
pump wear, use the largest orifice practical for your fertil-
izer application rate. Alternate orifice plates are listed in
the Seed Rate manual.
The best pressure range to maintain is 20-40 psi to
ensure optimum distribution while minimizing leakage.
Built-in check valves at the row units prevent flow below
15 psi.
The Seed Rate Chart book for this planter (manual part
number 401-647B) contains a table of orifice sizes in gal-
lons per acre.
System Damage/Uneven Application Risks:
Select orifice plates to balance flow. Sizes too small can result
in system rupture. Sizes too large can result in unbalanced
flow. Orifice plates do not set fertilizer rate. Rate is set at the
pump. Plates only create back-pressure to balance flow.
Agricultural Chemical Hazards:
Avoid contact with skin or eyes. Wear proper protective equip-
ment as required by chemical manufacturer. Avoid prolonged
breathing of chemical fumes. Wear respirator as required by
chemical manufacturer.Some chemicals will cause serious
burns, lung damage, and death. Seek medical assistance imme-
diately if accident occurs. Know what to do in case of acci-
dent.
Null4:
Figure 74
Fertilizer Drop Line Shutoff
29984
Agricultural Chemical Hazard:
Wear protective gloves when exchanging nozzles and caps.
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