STIHL MDG 1 Manual

The STIHL MDG 1 is a professional-grade, gasoline-powered mist blower/duster designed for agricultural, municipal, and pest control applications. It features a powerful 2-stroke engine, adjustable airflow and droplet size, corrosion-resistant materials, a comfortable harness system, and a robust spray/dust delivery system. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 2-stroke engine, fan housing, adjustable nozzle, chemical tank, harness, throttle control, and stop switch.

Feature	Description
Engine	Powerful 2-stroke gasoline engine with electronic ignition
Airflow Control	Adjustable fan speed for variable air volume
Nozzle System	Adjustable for mist or dust application; corrosion-resistant
Chemical Tank	High-density polyethylene tank with secure lid
Harness System	Padded, adjustable harness for operator comfort
Throttle Control	Lever-operated throttle on handle
Stop Switch	Emergency engine stop button
Fuel Tank	Integrated fuel tank with filter and cap
Carrying Handle	For safe transport when not in use
Maintenance Access	Easy-access panels for air filter and spark plug

Assembly & Preparation

Unpack and inspect all parts. Assemble on a clean, flat surface.

1. Attach the nozzle: Align with fan housing and secure with provided clamps.
2. Install the harness: Thread straps through backplate and adjust for fit.
3. Connect the chemical hose: Attach from tank outlet to pump inlet, ensuring tight seals.
4. Install the control cable: Connect throttle lever to engine carburetor.
5. Add fuel and oil: Use fresh gasoline and STIHL 2-stroke oil at 50:1 ratio.

WARNING! Unit is heavy; use proper lifting technique. Ensure all fasteners are tight before operation.

First-Time Operation

Perform pre-operation checks and start the engine.

1. Check fuel and oil: Ensure proper mix in fuel tank.
2. Inspect nozzle and hoses: Look for cracks or leaks.
3. Prime the engine: Press primer bulb 5-7 times until fuel is visible.
4. Set choke: Move to START position for cold engine.
5. Start engine: Hold unit securely, pull starter cord briskly.
6. Adjust throttle: After warm-up, adjust to desired operating speed.
7. Test spray: Direct nozzle away from people/animals and engage pump.

CAUTION! Always wear PPE: goggles, gloves, respirator, and protective clothing when handling chemicals.

Specifications

• Engine Type: 2-stroke, air-cooled.
• Displacement: XX cc (consult specific model plate).
• Fuel/Oil Ratio: 50:1 (STIHL 2-stroke oil).
• Fuel Tank Capacity: X.X liters.
• Chemical Tank Capacity: XX liters.
• Airflow Rate: Adjustable, up to XXX m³/h.
• Nozzle Type: Adjustable cone, mist/dust.
• Weight (dry): XX.X kg.
• Sound Power Level: XXX dB(A).
• Vibration Level: X.X m/s².

Controls and Settings

Main controls located on handle and engine housing.

Handle Controls: Throttle lever, pump engagement lever, stop switch.

Engine Controls: Choke lever, primer bulb, fuel valve.

Adjustments: Nozzle direction (vertical/horizontal), airflow volume (throttle), droplet size (nozzle tip), harness straps (length/tension).

Settings: For specific applications (e.g., mosquito control, orchard spraying), refer to chemical manufacturer guidelines for rate and droplet size.

Fuel & Chemical Handling

Use only fresh, unleaded gasoline (min. 89 octane) mixed with STIHL 2-stroke oil at 50:1.

1. Mix fuel in approved container: Add oil to gasoline, close, and shake.
2. Fill fuel tank: Use funnel; avoid spills. Clean any spilled fuel immediately.
3. Chemical filling: Wear PPE. Fill tank to marked level; do not overfill.
4. Chemical compatibility: Use only chemicals approved for mist blower application.

Tip: Store fuel and chemicals in labeled, approved containers away from heat and ignition sources.

Operating Procedures

Standard operation for spraying/dusting.

1. Don PPE: Goggles, respirator, gloves, long sleeves, pants.
2. Start engine: Follow steps in First-Time Operation.
3. Adjust harness: Ensure comfortable, balanced fit.
4. Begin application: Engage pump lever; adjust throttle for desired airflow.
5. Apply chemical: Use sweeping motion, maintaining consistent distance from target.
6. Monitor tank levels: Refuel and refill chemical tank as needed.
7. Shutdown: Disengage pump, return throttle to idle, run for 30 seconds, press stop switch.

WARNING! Never point nozzle at people, animals, or food/water sources. Be aware of wind direction to avoid drift.

Maintenance Schedule

Regular maintenance ensures performance and longevity.

Interval	Task
Before each use	Check fuel, oil, nozzle, hoses, harness
After each use	Flush chemical tank and lines with clean water
Every 25 hours	Clean/replace air filter; check spark plug
Every 50 hours	Clean fuel filter; inspect fuel lines
Every 100 hours	Check/replace pump diaphragm; inspect fan blades
Annually	Full service: carburetor adjustment, bearing inspection

CAUTION! Always disconnect spark plug wire before performing maintenance.

Storage & Transport

Prepare unit for storage or transport.

1. Drain fuel: Run engine until it stops, or use fuel siphon.
2. Drain chemical tank: Flush thoroughly with clean water.
3. Clean exterior: Wipe with damp cloth; dry completely.
4. Store: In dry, well-ventilated area, away from ignition sources.
5. Transport: Secure in vehicle to prevent tipping; ensure tank caps are tight.

CAUTION! Never store unit with fuel in tank for more than 30 days. Use fuel stabilizer if needed.

Safety & Regulatory Information

This machine generates noise and vibration. Wear hearing protection. Complies with ANSI B175.2 and EPA emission standards for handheld power equipment. Contains parts that can be damaged by certain chemicals; consult manual for compatibility. For support, visit www.stihlusa.com or contact 1-800-467-8445.

Symbols on machine: Read and understand all warning labels (fire, chemical, rotating parts, hot surface).

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, flooded, bad spark	Check fuel mix; wait if flooded; check/replace spark plug.
Engine runs poorly	Dirty air filter, clogged fuel filter	Clean/replace air filter; clean fuel filter.
No spray output	Clogged nozzle, empty tank, pump issue	Clean nozzle; refill tank; check pump diaphragm.
Excessive vibration	Damaged fan blade, loose parts	Inspect fan; tighten all fasteners.
Chemical leak	Cracked tank, loose hose	Inspect tank and hoses; replace if damaged.

Reset: For electronic ignition issues, disconnect spark plug wire for 1 minute.

Service: 1-800-467-8445; www.stihlusa.com