Orchard sprayer selection: match air delivery to the canopy
Choose an orchard sprayer for the tree volume and canopy it must reach. Airblast sprayers use a pump to feed spray into a fan-produced airstream, which carries droplets toward the crop.
Describe the orchard and available labor
Match equipment to farm conditions, available labor and operating tasks. Tell the supplier who will drive, service and move the sprayer.
During the demonstration, identify observation positions in the inner and outer canopy, upper and lower foliage, and both sides of the row. Upper canopy regions can be difficult to reach.
Inspect the airflow system
Examine the fan blades for damage and check blades and screens for accumulated material. Inspect the ducts, deflectors and scoops. Adjust air direction toward the crop through the manufacturer's safe procedure; this also reduces disturbance of leaves and dirt on the ground.
Identify nozzles and service parts
Disc-and-swirl combinations affect output and droplet characteristics. Molded nozzles and disc-and-core components have different handling and maintenance needs.
Review driveline and hose condition
Check the power take-off shaft, alignment and lubrication provisions against the tractor-sprayer combination. Service points include splines, tubes, universal joints and connections. Have the supplier explain guarding and safe access before commissioning.
Inspect hoses for cracking, deterioration and repaired sections. Sunlight and freeze-thaw exposure contribute to hose damage. When replacing a hose, identify both ends so its connections remain traceable.
Confirm the pump and pressure-control specification
Identify whether the machine has a diaphragm, centrifugal or roller pump. Service requirements differ with mechanism and wear; use the manufacturer's instructions for the installed pump.
Match the pressure regulator and gauge to the intended operating range. A regulator designed for a different range can regulate poorly or produce pressure spikes. Dirty, corroded or damaged regulator springs can also cause problems. Have a technician compare replacement components with the original specifications.
Ask which gauges, regulator repair parts, nozzles and strainers are available locally.
Inspect cleaning access
Check the tank, plumbing and strainers for residue. Inspect nozzle patterns for gaps or variations.
Pressure washing can damage bearings, belts, tensioners, electronic housings, engines and gearboxes.
Airblast sprayer calibration: measure the installed configuration
Before airblast sprayer calibration, correct equipment faults, then measure output and inspect canopy delivery. A malfunctioning sprayer can miss canopy areas or apply insufficient pesticide. Recalibrate after changing nozzles, pressure or tractors.
Record the setup before measuring
Recalibrate with the sprayer, tractor, installed nozzles and operating pressure that will be used. After a repair, the observed fault, corrective work and subsequent test belong together in the maintenance history.
For Turbo Mist (Turbomist) sprayers, calibration follows the orchard airblast procedure above for the installed outlets.
Check strainers, agitation and nozzle patterns
Inspect suction and basket strainers and look for accumulated residue in the tank and plumbing. Debris or clumped material in strainers can indicate inadequate agitation or mixing. Resolve those conditions before measuring the clean-water output.
Examine every nozzle pattern for breaks or variations. Clean components gently with a soft plastic-bristled brush. Handle ceramic disc-core parts carefully to avoid damage.
Settled pesticide after spraying can indicate inadequate agitation, mixing or recirculation. Inspect the system using the manufacturer's safe procedure.
Measure travel and liquid output separately
Nozzle flow is measured per minute; application volume is expressed per area.
Investigate worn, damaged or plugged nozzles, plugged strainers and hose restrictions if measured flow is wrong. Recheck after correcting the fault. Then inspect where the air carries the spray into the canopy.
Keep your spray records in one place. Free to start.
Use the weekly walk-around checklist
On the printable EM 9316 weekly checklist, enter the inspection date, checker, sprayer identity and farm or block.
Checks with the machine stopped
Follow the manufacturer's isolation instructions before inspecting lubrication, fan, belts, plumbing, tires, nozzles, agitator, tank and pump. The lubrication checks cover the mechanical agitator shaft, PTO crosses, telescoping collar and other grease fittings.
For the fan, record blade damage, residue buildup and the direction of air ducts. Inspect hose deterioration and nozzle condition separately.
Observe the running system safely
During the permitted operating inspection, watch for irregular belt or tensioner movement, abnormal spray appearance and leaks under pressure. Observe gasket areas, hose vibration, unusual noises, gauge movement, and regulator or bypass operation. Follow the equipment's guarded operating procedure throughout.
Describe pressure faults precisely. A fluctuating needle, leaking fitting and blocked nozzle require different investigations. Have the technician check regulator range and spring condition before changing mixture or application settings. Retest after repairs.
Inspect nozzle materials and offseason storage
Nozzle wear depends on pesticide products, operating pressure, frequency of use and material. Compare ceramic, hardened stainless steel, brass and polymer when assessing replacement needs. Inspect the actual discharge pattern and measured flow throughout the season.
During offseason servicing, place nozzles and strainers in warm water with suitable detergent. Gently scrub, rinse and dry them before storing in a protected, identified location. Mark purchase dates to track their service history.
Molded plastic nozzles with ceramic tips can simplify handling because the assembly is one piece. Colored bodies and legible size markings aid identification, and these nozzles cannot be mounted backward.
Retain the maintenance and calibration record
Keep the completed checklist, manual, parts references and calibration measurements with the sprayer. After a nozzle, pressure or tractor change, record the new configuration and its test results. This connects the measured delivery to the equipment actually used in the orchard.
Apple, pecan and other orchard sprayers by mounting and make
An apple orchard sprayer, a pecan orchard sprayer and any other orchard sprayer are sold in several mountings: a 3 point hitch orchard sprayer (3 point air blast sprayer, 3 point hitch air blast sprayer), a trailed or PTO-driven unit pulled behind the tractor, an ATV orchard sprayer, a mini air blast sprayer for a small block and an autonomous orchard sprayer that drives itself between rows. Whatever the mounting, an airblast sprayer uses a pump to feed spray into a fan-produced airstream that carries droplets toward the crop, so the checks above apply unchanged: air direction toward the canopy, nozzle type, PTO shaft, pump and regulator, and cleaning access.
Makes such as Berthoud, Myers, FMC, John Bean, Swanson, Kinkelder, AgTec and Tornado are searched together with the words orchard sprayer or air blast sprayer. For a make you are considering, ask the supplier for the model's manual and parts list, ask which nozzles, gauges, regulator repair parts and strainers are available locally, and ask for a demonstration in your own canopy. The same questions apply to a second hand orchard sprayer, which should in addition be examined for fan damage, hose cracking, regulator springs and residue in the tank and plumbing. FMC orchard sprayer parts are identified by the model and serial number on the machine; give them to the parts supplier with a description of the worn component.
Orchard weed sprayer
An orchard weed sprayer treats the strip under the trees, not the canopy, so it uses boom or herbicide-strip nozzles instead of an air blast fan. Calibrate it as a boom: nozzle output is measured per minute, while application volume is expressed per area. Keep it separate from the airblast sprayer in the equipment notes, and clean the tank and strainers between a herbicide and any fungicide or insecticide to avoid carryover.
Next step
See the airblast maintenance checklist and the airblast calibration procedure.