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Agricultural sprayers are indispensable during the busy farming season, yet occasional malfunctions can severely disrupt operational progress. Mastering diagnostic and troubleshooting techniques for common faults enables swift resolution, ensuring uninterrupted fieldwork.
Insufficient or fluctuating spray pressure ranks among the most frequently encountered issues. Should you observe poor atomisation of the spray solution or a noticeable reduction in spray range, commence by inspecting whether the filters are clogged. The suction filter within the tank and the return water filter in the pipework constitute the primary points for examination; cleaning these components often resolves the problem immediately. If the filters are clear, examine the pump's operation for severely worn components such as the diaphragm or piston. Additionally, pressure irregularities may stem from leaky inlet pipework allowing air ingress, or a malfunctioning pressure regulator.
Abnormal atomisation or dripping from nozzles is another frequent fault. If the spray pattern appears skewed or irregular, it is typically due to clogged nozzle plates or filter caps, which should be cleaned or replaced immediately. Persistent dripping from nozzles usually originates from the shut-off valve (switch valve), likely due to a worn valve core or foreign object obstruction. Disassembly for cleaning or replacement is required. Inconsistent flow rates across multiple nozzles directly cause uneven field application. Check for mixed nozzle types or worn components; uniformly replacing all nozzles ensures reliable uniformity.
Liquid leakage is another condition requiring vigilance. Upon detection, immediately assess the source based on the location. Loose pipe joints are a common cause, resolved by tightening. Leaks from the pump body itself or valve seals typically indicate ageing or damaged components such as oil seals or O-rings, necessitating replacement of the relevant seals for a permanent fix.
For electric or motorised sprayers, difficulty starting the engine or motor, or weak performance during operation, indicates a power system fault. In such cases, systematically inspect fuel quality, spark plugs, air filters, and the integrity of electrical connections. Regular maintenance—such as using fresh fuel, cleaning air filters, and tightening wiring—can effectively prevent these issues.
Before undertaking any repairs, particularly involving core components like pumps and nozzles, ensure the equipment is completely powered down and depressurised to safeguard personnel. For complex faults, document the symptoms and promptly contact professional maintenance personnel to avoid exacerbating the issue through incorrect handling.
