System Operation

The liquid fertilizer piston pump is a single piston, variable stroke pump. This pump is a positive displacement metering device. The output rate can be set by selecting the high or low rate range and setting the stroke of the pump. The gallons per acre application will be accurate regardless of varying speeds of the drive mechanism.

Special fittings for delivery to the openers have removable orifices that restrict the flow of the pump to each row in order to maintain a specific pressure range in the manifold. The lower end of the range's shown specifications must be maintained to ensure even fertilizer distribution from row to row. The upper end of the range's shown specifications should NOT be exceeded to prevent damage to the system. This is the ONLY function of the orifices. They have no effect on the gallon per acre application rate.

Specification

Range Lower End -Pressure 138 kPa (1.4 bar) (20 psi)
Range Upper End -Pressure 483 kPa (5.0 bar) (70 psi)

The special fitting has a diaphragm that acts as a check valve. The minimum shown pressure must be in the system before fertilizer is delivered to the opener.

Specification

Diaphragm -Minimum Pressure 138 kPa (1.4 bar) (20 psi)

Remove drive chain from piston pump when fertilizer is not being used while planting. This will prevent damage to the pump.

A41214
A36438


A-Screws
B-Fitting
C-O-Ring
D-Diaphragm
E-Cap
F-Screen
G-Rubber Seal
H-Orifice
I-Adapter
J-Cap

OM60109,130A -19-24APR97-1/2

It is normal for a small amount of oil to "weep" from hole (A). Be sure hole is kept open. Inspect at the beginning of each season.


A-Oil "Weep" Hole

A41024

OM60109,130A -19-24APR97-2/2