GREAT PLAINS PL5700, Operator'S Manual

Page: 62 / 150

Great Plains | 411-681M | 04/08/2021 55
PL5700 Planter Table of Contents Index Operation
* Recommended Rate Range in liters per hectare.
Pressure is 103-276 kPa. Values based on: 8.0 kph
and 1.28 kg/liter Fertilizer solution density.
Orifice Plate Installation
To install the orifice plates:
1. Insert the orifice plate (1) inside the gasket (2)
supplied with the nozzle.
2. Insert the gasket and orifice plate with the
number side facing out the nozzle outlet.
Strainer
A strainer is supplied with the fertilizer pump. It is
plumbed before the pump. The standard 80 mesh
screen (3) should be suitable for most applications.
Other screen sizes are available from Banjo
Corporation.
If changing screen sizes, keep in mind the following:

A smaller mesh (100) will keep very small
manifold orifice plates from plugging so often.
However, the screen will have to be cleaned
more often.

A larger mesh (50 or 30) will pass more material,
but should only be considered when using large
manifold orifice plates.

A plugged or partially plugged screen will starve
the pump, resulting in a reduced application rate.

Mesh sizes from smallest to largest: 100, 80, 50,
30.
Relief Valve
A relief valve is plumbed after the pump outlet to
protect the manifold and pump from excessive
pressure. Any product that dumps over the relief
valve will discharge from the dump line.
To set the relief valve on the fertilizer pump:
1. Unlock the plastic jam nut (4) from the relief valve
knob (5).
2. Turn the knob counterclockwise two turns. Start
at this setting.
3. Observe the manifold gauge (6) at the front of the
fertilizer tank. Watch for relief valve discharge
while operating in the field.
4. If the valve is dumping product and the gauge
reads under 65 psi, stop the tractor and turn the
knob clockwise 1/4 turn. Continue operating at
normal field speed. Repeat this step as needed
until no product is discharged from the relief
valve.
5. If the pressure gauge reads above 65 psi,
change to a larger orifice. Go to step and repeat
the steps.
Setting Fertilizer Rate
This is only an overview of how to set the fertilizer
rates. Refer to the Material Rate manual. Refer to the
John Blue manual for more fertilizer pump details.
Refer to your console manual for more console
operation details.
Fertilizer rate is controlled by pump rate. Consistent
delivery across the planter is controlled by orifice
size at the row unit drop-line points.
Consistent system operation also requires a
correctly adjusted relief valve and a well maintained
strainer ahead of the pump. See “ Liquid Fertilizer
Strainer ” on page 68 and
Great Plains recommends checking with your local
agronomist as soil conditions can vary. Conditions in
your area may need less or more amounts of
fertilizer.
Fertilizer Ground Drive
The ground drive liquid fertilizer option uses a
positive displacement pump. For pump operation
29984
2
1
18418
3
TP-71222
6
TP-71152B
4
5
3-Section Kit shown