Troubleshooting Common Sprayer Problems on the Farm

Even the most reliable spraying equipment can run into issues over time. Whether you’re managing broadacre paddocks, orchards, or vineyards, knowing how to identify and fix common sprayer problems will save you time, product, and frustration.

Here’s a practical guide to diagnosing and resolving the most frequent sprayer issues faced on Australian farms — with a few expert insights from Silvan’s decades of experience in agricultural spraying.

1. Uneven Spray Patterns

If you notice patchy coverage or stripes in your field, the culprit is often clogged or worn nozzles.

Possible causes:

• Blocked filters or nozzle tips
• Uneven pressure across the boom
• Worn or mismatched nozzle sizes

Fix:

• Clean filters and nozzle tips with water or compressed air (never use metal objects).
• Replace any worn or mismatched nozzles.
• Check for leaks or damaged sections along the boom that could affect pressure distribution.
• Recalibrate your sprayer to ensure even flow rates.

💡 Tip: Keep a set of spare nozzles and strainers in your ute for quick swaps during the season.

2. Low or Fluctuating Pressure

When spray pressure drops or fluctuates, you’ll struggle to achieve proper droplet size and coverage.

Possible causes:

• Air leaks in suction lines
• Clogged filters or valves
• Worn or damaged pump seals
• Drive belt slippage (for belt-driven pumps)

Fix:

• Inspect hoses, clamps, and suction lines for cracks or air leaks.
• Clean or replace filters and strainers.
• Check the pump’s diaphragm or piston seals — if worn, replace them immediately.
• Tighten or replace drive belts if pressure fluctuates with RPM.

3. Pump Failing to Prime

If your sprayer pump won’t draw liquid, it could be a simple setup or airlock issue.

Possible causes:

• Air trapped in suction line or pump housing
• Blocked inlet filter
• Suction hose not fully submerged
• Leaks in suction fittings

Fix:

• Fill the suction line manually to remove trapped air.
• Check that the suction hose is airtight and properly clamped.
• Clean the inlet filter and ensure the liquid source is adequate.
• Prime the pump according to the manufacturer’s instructions before operating.

4. Leaks and Drips

Leaks are more than a nuisance — they waste product, create uneven coverage, and pose safety risks.

Possible causes:

• Loose hose clamps or damaged seals
• Cracked lines or fittings
• Worn diaphragm, O-rings, or valves

Fix:

• Tighten or replace clamps and fittings.
• Inspect all hoses and seals for chemical wear or UV cracking.
• Replace damaged parts with genuine Silvan components to ensure compatibility and safety.

5. Inconsistent Flow or Pressure Between Booms

If one side of your boom sprays more heavily than the other, the system likely has a blockage or flow restriction.

Possible causes:

• Partially blocked boom section or nozzle body
• Uneven boom height or slope
• Malfunctioning pressure regulator or control valve

Fix:

• Flush each boom section individually to identify the blockage.
• Adjust boom height to maintain even overlap.
• Check the pressure regulator and ensure valves are opening evenly.

6. Electrical or Control System Issues

Modern sprayers often use electric pumps, solenoid valves, or GPS-controlled systems. When these fail, application accuracy can suffer.

Possible causes:

• Corroded wiring or loose connections
• Blown fuses or faulty switches
• Flat or undercharged battery

Fix:

• Check wiring for corrosion and ensure all terminals are clean and tight.
• Replace blown fuses or switches as needed.
• Test the power source and charge or replace the battery if voltage is low.