Great Plains YP1625 Material Rate - Manual (Page 57)

Great Plains Mfg., Inc.
53
11/23/2011 401-263B
Fertilizer Rate
The liquid fertilizer option uses a JohnBlue piston pump.
For pump operation and pump maintenance refer to the
Planter Operator manual and JohnBlue pump manual.
The JohnBlue manual is supplied in the liquid fertilizer
option package.
The pump is driven by a ground contact wheel, and fertil-
izer rate is independent of seed rate. Fertilizer rate is set
by a pump dial and a sprocket on the ground drive
assembly.
Note: Great Plains recommends checking with your local
Agronomist as soil conditions vary. Soil conditions
in your area may need lesser or more amounts of
fertilizer than represented in these charts. Do not
exceed 12 gallons/ac (112 liters/Ha) in any case.
Note: Always remove pump drive chain when not in use.
Do not operate planter pump when not applying
material.
Orifice Plate Selection
Refer to Figure 15
Wear protective gloves when changing orifice plates.
Refer to Figure 15
In general, the orifice
needs to be small enough to
create at least 15 psi of pressure in the manifold but
large enough to prevent the manifold pressure from
exceeding 85 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.
The best pressure range to maintain is 15-40 psi to
ensure optimum distribution while minimizing leakage.
Null4:
Figure 15
Fertilizer Orifice Plate
29984
6
6
Orifice Part Port Port
Size Number Diameter Area
20 832-052C 0.020 in 0.20 mm²
28* 832-056C 0.028 in 0.40 mm²
34* 832-053C 0.034 in 0.59 mm²
48* 832-054C 0.048 in 1.17 mm²
59 832-057C 0.059 in 1.76 mm²
80 832-055C 0.080 in 3.24 mm²
98 832-059C 0.098 in 4.87 mm²
29993 Sizes standard in many fertilizer bundles.
Check your accessories before ordering.