Liquid Fertilizer—Piston Pump System
| Symptom | Problem | Solution |
Pump hard to prime. | Leak in suction hoses. | Check plumbing for leaks. Tighten and seal where needed. |
Open special fitting check valve. | See PUMP PRIME AND INITIAL START UP in Liquid Fertilizer—Low Pressure section or PRIMING AND INITIAL START UP in Liquid Fertilizer—High Pressure section. |
Pump will not prime. | Strainer plugged. | Clean strainer. |
Pump rate set too low. | Set pump according to rate chart. | |
Pump valves fouled. | See your John Deere dealer. | |
Packings worn. | See your John Deere dealer. |
Pump metering low. | Leak in suction hoses. | Check plumbing for leaks. Tighten and seal where needed. |
Open special fitting check valve. | See your John Deere dealer. | |
Strainer plugged. | Clean strainer. | |
Pump rate set too low. | Set pump according to rate chart. | |
Pump valves fouled. | See your John Deere dealer. | |
Pump drive range set incorrectly. | Set drive according to rate chart. | |
Broken valve spring. | See your John Deere dealer. |
Pump metering high. | Pump rate set too high. | Select pump number according to rate chart or adjust upward due to low drive wheel slippage. |
Pump drive range set incorrectly. | Set drive according to rate chart. | |
Valve stuck open. | See your John Deere dealer. | |
Broken valve spring. | See your John Deere dealer. | |
Contaminates under valve. | See your John Deere dealer. |
Fertilizer leaks past pump when pump is stopped. | Valve stuck open. | See your John Deere dealer. |
Broken valve spring. | See your John Deere dealer. |
Leaks between pump and crankcase. | Rod packing worn. | See your John Deere dealer. |
Pump using excessive oil. | Oil seals worn. | See your John Deere dealer. |
O-rings leaking. | See your John Deere dealer. |
Noisy pump operation. | Pump components worn. | See your John Deere dealer. |
Fertilizer leaks at opener when machine stopped. | Check valve malfunctioning. | Repair or replace check valve. |
Main strainer screen plugged frequently. | Main and row strainer mesh too fine. | Use courser mesh screens. See STRAINER RECOMMENDATIONS in Liquid Fertilizer—Low Pressure section or STRAINER RECOMMENDATIONS in Liquid Fertilizer—High Pressure section. |
Fertilizer is dirty or crystallized. | Install finer mesh strainer on nurse tank. |
Liquid fertilizer tank does not fill. | Drip line or fitting plugged. |
Clean. See CLEAN LIQUID FERTILIZER TANK LID FITTINGS AND DRIP LINE HOSES in Service and Adjustments section. |
CAUTION: Avoid personal injury. Do not service if system is under pressure. Relieve pressure through tank cap spring loaded vent. Do not remove cap if system is under pressure.Fertilizer manifold pulsates or shakes. | Incorrect nozzle used. | Install correct orifice or nozzle. Install gauge to monitor system pressure. |
Main row strainer plugged. | Clean strainer. Install strainer on nurse tank. |
Fertilizer leaks at opener when machine stopped. (Frame Mounted Single-Disk [Low Pressure-Flow Divider Delivery] Only) | 1 psi check valve stuck open or leaking. | Clean or replace check valve. |
OUO6435,0001EF2-19-20090526 |