System Operation

IMPORTANT: John Deere recommends all liquid fertilizer systems be equipped with a gauge to monitor system pressure.

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

The liquid fertilizer pump (A) is a single piston, variable stroke pump. This pump is a ground driven, positive displacement metering device. Select the high or low rate range and set the stroke of the pump to adjust the output rate. The gallons per acre application will be accurate regardless of varying speeds of the drive mechanism.

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The unit mounted single disk opener uses a nozzle (A) to restrict the flow to each row in order to maintain a specific pressure range. The lower end of the range, 138 kPa (1.4 bar) (20 psi), must be maintained to ensure even fertilizer distribution from row to row. The upper end of the range, 483 kPa (5.0 bar) (70 psi), should NOT be exceeded to prevent damage to the system. The nozzles are used to maintain system pressure, they have no effect on the application rate.

The delivery hose is equipped with a check valve near each opener. A pressure of 69 kPa (0.7 bar) (10 psi) minimum must be present before fertilizer is delivered to the opener.

A-Nozzle

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IMPORTANT: Pump crankcase should be equipped with a vent plug (A). If pump is removed from machine, remove vent plug in pump crankcase and replace with solid plug to prevent oil from leaking out.

It is normal for a SMALL amount of oil to leak from weep hole (B). The weep hole must remain open. Inspect at the beginning of each season. Overgreasing of lubrication fitting (C) can cause plugging of weep hole and/or cause grease to leak from weep hole.

A-Vent Plug
B-Weep Hole
C-Lubrication Fitting
D-Oil Check Valve and Fill Level

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