How to Use a Fogging Machine

How to Use a Fogging Machine

I. Pre-Use Preparation (Mandatory)

1. Personal Protection (Top Priority)  

Wear long-sleeved shirts, long pants, rubber boots, gloves, safety goggles, and a respirator mask.  

Tuck in collars, cuffs, and pant legs; work against the wind, positioning yourself upwind.

2. Machine Inspection  

Fuel tank: Use two-stroke-specific mixed oil (gasoline:oil = 25:1 or 50:1, as per instructions). Fill to 2–3 cm below the opening—do not overfill.  

Spray tank: Ensure lid gasket is intact and sealed tightly; check that filter screen and nozzle are unobstructed and free of clogs.  

Hoses: Inspect fuel and chemical hoses for aging or cracks; ensure all connections are secure.  

Battery/Ignition: Confirm battery has charge; pressing the ignition button should produce a distinct "zzz" sound from the spark plug.

3. Chemical Mixing (Critical Step)  

First dilute chemicals in a bucket according to ratio, stir thoroughly, then filter before adding to the spray tank.  

Fill the tank to 80% capacity (leave space for pressure), and tighten the cap securely—loose caps prevent misting.  

Prohibited: Do not use mist blowers with pesticides prone to high-temperature decomposition, or highly corrosive sulfur- or phosphorus-containing chemicals.

II. Starting Procedure (Start on Ground, Never While Wearing)  

Place the machine flat on the ground, away from weeds or flammable materials, with the nozzle facing outward and away from people.  

Open the fuel tank valve; close the chemical valve first.  

Pump fuel: Press the carburetor primer bulb repeatedly (about 20 times for new machines) until fuel appears in the fuel line and enters the carburetor.  

Cold engine: Close the choke; hot engine: partially or fully open the choke.  

Press and hold the ignition switch (listen for sparking), simultaneously rapidly pump the air compressor or pull the starter handle until the engine fires with a "pop."  

After starting, let it warm up for 30–60 seconds—engine sound should be steady and powerful, exhaust pipe glowing red—then wear the machine for operation.

III. Spraying Operation (Worn on Back)  

Put on the machine, keep the body upright, and slightly tilt the spray hose downward.  

Slowly open the chemical valve, gradually adjusting to achieve optimal mist volume—fine, even droplets without dripping.  

Walking speed: 2–4 km/h, move steadily; keep nozzle 0.5–1.5 meters from crops, gently sweeping up, down, left, and right.  

Wind direction rule: Stand upwind, direct nozzle downwind, angle ≤45°; avoid drift toward yourself.  

In orchards: Spray from outer rows inward, bottom-up, focusing on leaf undersides, branches, and fruit.

IV. Normal Shutdown (Sequence Must Not Be Reversed)  

First, close the chemical valve, continue spraying empty for 10–20 seconds to clear remaining liquid from lines.  

Then close the throttle/fuel tank valve, allowing the engine to stop naturally.  

Do not immediately place a hot engine on the ground—suspend it or place on a stone slab to prevent scorching surfaces or igniting weeds.  

Strict prohibition: Closing throttle first but forgetting to close chemical valve → chemical backflow into carburetor/spark plug, making restart difficult.

V. Cleaning and Maintenance After Use (Extends Lifespan)  

After each application: Add clean water to the spray tank, run empty for 1–2 minutes to flush chemical lines, nozzles, and hoses.  

Drain residual water, wipe down the machine. In winter, completely drain the tank and lines to prevent freezing damage.  

Regular maintenance:  

Nozzle/filter: Rinse with clean water; use soft brush to unclog if blocked.  

Exhaust pipe/combustion chamber carbon buildup: Clean every 20–50 hours.  

Spark plug: Remove carbon deposits; gap should be 0.5–0.7 mm.  

Long-term storage: Empty fuel and chemicals, remove battery, store in dry, cool place.

VI. Safety Rules (Absolute Prohibitions)  

❌ Never start while wearing the machine; never operate indoors or in enclosed spaces.  

❌ Never point nozzle at people, animals, food, or water sources.  

❌ Never operate in high temperatures, midday sun, strong winds (>level 3), or during rain.  

❌ Do not touch exhaust pipe or combustion chamber during operation—temperatures can exceed 500°C.  

❌ Always shut off engine, allow cooling, and stay away from open flames or smoking when refueling or refilling chemicals.

VII. Quick Fixes for Common Minor Malfunctions  

No mist: Loose chemical tank cap → leak; clogged nozzle → clean; chemical valve closed; insufficient pressure in tank.  

Large droplets/dripping: Valve opened too wide; low pressure; worn nozzle.  

Hard starting: Insufficient priming of carburetor. Air damper not properly adjusted; spark plug fouled or damp; battery dead  

Engine stalls during operation: engine stops before chemical valve is closed → chemical fluid backflows; fuel line clogged; overheating