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7 - Fault finding
Operating incidents
General information
Operating incidents are often due to the same causes:
1. Even a small suction leak will reduce the flow from the pump and can completely stop suction.
2. A blocked suction filter can impede suction or stop it and prevent the pump from operating normally.
3. A blocked pressure filter causes an increase in pressure upstream of the filter This can trip the safety valve.
4. Blocked boom filters or nozzle filters cause the pressure to increase at the gauge but fall in the boom.
5. Impurities sucked in by the pump can prevent valves from closing correctly. This reduces the flow from the pump.
6. Incorrect re-assembly of the pump, in particular the diaphragm covers, causes air to be drawn in or leaks, and reduces
the flow from the pump.
7. Oxidised or dusty hydraulic components result in poor connections and premature wear.
8. A poor power supply causes operating errors or breakdowns in the electrical circuit.
To prevent such inconveniences, ALWAYS check that:
1. The suction, pressure and nozzle filters are clean.
2. Pipes, particularly the suction pipes, are intact: no leaks, no kinks, no pinching.
3. Rings and gaskets are in position and in good condition.
4. The pressure gauge is operating correctly. Dosage accuracy depends on it.
5. Regulation is working correctly. Carry out checks using clean water.
6. Hydraulic components are clean.
7. The tractor's battery is in good condition and the contacts are clean.
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