One of the most common mistakes when winterising a machine is assuming that opening the drain valve at the bottom of the main tank is sufficient. This only drains the main tank, while water may remain trapped in the chambers of the piston-diaphragm pump, filters, valves and pipework.
In mist blowers, water can also accumulate in the lower sections of the nozzle manifolds and in the housings of anti-drip diaphragms.
When water freezes, its volume increases by approximately 9%. The resulting ice can damage pump housings, valves, filters and other system components. Such damage often only becomes apparent during the first start-up in spring, when the machine needs to be ready for work.
1. Thoroughly Flush the System and Clean the Exterior
After spraying, ensure that any remaining spray mixture is disposed of correctly in accordance with the plant protection product manufacturer's instructions and applicable regulations.
Then thoroughly rinse the tank and the entire spraying system. If the machine is equipped with rotating tank-cleaning nozzles, use them. Circulate clean water through the relevant valves, pipes and nozzles to remove any remaining chemical residues.
Clean the exterior of the machine as well. A clean surface makes it easier to identify damage, worn components and signs of corrosion.
2. Protect the Entire Spraying System Against Freezing
Draining the main tank alone does not protect the entire system.
Use a suitable antifreeze solution specifically intended for use in spraying systems and compatible with the materials used in the pump, diaphragms and seals.
Start the pump at low speed and gradually open each spray section individually until the antifreeze solution flows through every nozzle. This allows the protective fluid to reach the pump, pressure regulator and pipework, helping to prevent frost damage. In spring, the remaining solution can be drained into a suitable container and stored for reuse the following winter, provided that the product manufacturer's instructions permit this.
3. Clean the Nozzles, Strainers and Filters
Remove the nozzle inserts and strainers, and carefully clean them with water and a soft brush.
Never use wire, needles or other sharp metal objects to clean nozzle orifices. These can damage the precisely calibrated openings, resulting in uneven spray distribution and incorrect application rates.
Also inspect the suction and pressure filters and remove any accumulated debris.
4. Inspect the Pump, Fan Gearbox and PTO Drive Shaft
Check the condition and level of the pump oil and carry out any necessary maintenance in accordance with the manufacturer's instructions and the number of operating hours.
Pay particular attention to the diaphragms and seals. If you notice signs of wear or damage, replace them in good time.
On mist blowers, also check the oil in the fan gearbox. Milky or cloudy oil may indicate water contamination and requires inspection and appropriate servicing.
Clean and lubricate the designated lubrication points on the PTO drive shaft and check the condition of its protective guards. Repair any damage to the paintwork on the machine frame to prevent corrosion.
5. Protect the Pressure Gauge and Electronic Components
Remove the pressure gauge from the pressure regulator and store it upright in a warm place to prevent glycerine leakage and protect the measuring mechanism from any residual water that could freeze.
Disconnect the AG-TRONIK controller or tablet from the tractor cab and store it in a dry place to help prevent contact oxidation.
Whenever possible, store the machine in a dry, covered area throughout the winter.
Timely Preparation Helps Prevent Unnecessary Costs
Properly preparing your sprayer or mist blower for winter storage can prevent numerous types of damage and help ensure that your machine is ready for the next season.
If you notice worn hoses, diaphragms, seals or other damaged components during inspection, it is advisable to replace them before the next spraying season begins.
Need Help Preparing Your Machine for Winter?
Contact the Agromehanika service team. Our technicians will be happy to assist you with inspecting, maintaining and properly preparing your sprayer or mist blower for winter storage.
