Stihl SR 320 SR 400 Instruction Manual

Pages 44

Year 1999

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of 44

Stihl SR 320 SR 400 Specification

The Stihl SR 320 and SR 400 are powerful backpack sprayers designed for professional agricultural and landscaping applications. Both models are engineered to combine efficiency with ease of use, catering to the needs of professionals who require reliable equipment for spraying pesticides, herbicides, and fertilizers.

The SR 320 is equipped with a robust 56.5cc 2-stroke engine, providing ample power for a variety of spraying tasks. It features a high-performance pump capable of delivering a maximum spray volume of up to 0.15 gallons per minute, ensuring thorough coverage over large areas. The unit is designed with a lightweight and ergonomic backpack frame, enhancing user comfort during extended periods of operation.

In comparison, the SR 400 offers an upgraded engine with a displacement of 63.3cc, delivering higher power output for demanding tasks. It is capable of achieving a maximum spray volume of up to 0.21 gallons per minute, making it suitable for more extensive applications. The SR 400 also includes additional features such as a multi-function control handle that allows for easy operation and precise control of the sprayer.

Both models are equipped with a large-capacity chemical tank, reducing the frequency of refills and increasing productivity. The tanks are made from durable, corrosion-resistant materials to ensure longevity and reliability. Additionally, the sprayers include advanced anti-vibration technology to minimize operator fatigue and improve comfort. The Stihl SR 320 and SR 400 are designed to meet the rigorous demands of professional users, offering a combination of power, precision, and durability for efficient spraying operations.

Stihl SR 320 SR 400 F.A.Q.

How do I properly mix fuel for the Stihl SR 320 and SR 400?

Use a 50:1 fuel-to-oil ratio. Mix 2.6 ounces of 2-cycle engine oil with 1 gallon of unleaded gasoline. Ensure the mixture is well-blended before use.

What should I do if my Stihl SR 320 or SR 400 won't start?

Check the fuel level and quality, inspect the spark plug for fouling, ensure the air filter is clean, and confirm the choke is in the correct position.

How often should I clean the air filter on my SR 320 or SR 400?

Clean the air filter after every 10 hours of operation, or more frequently in dusty conditions. Replace if it's damaged or doesn't clean properly.

What is the correct procedure for winterizing my Stihl SR 320 or SR 400?

Drain the fuel tank and run the engine until it stops. Clean the machine thoroughly and store it in a dry place. Consider removing the spark plug and adding a few drops of oil to the cylinder.

How can I adjust the carburetor on my SR 320 or SR 400?

Use a small screwdriver to adjust the L (low speed), H (high speed), and LA (idle speed) screws. Refer to the user manual for specific settings and ensure adjustments are made slowly.

What type of maintenance is required for the nozzle of the SR 320 or SR 400?

Regularly inspect the nozzle for blockages or wear. Clean it with water and a soft brush, and replace it if any damage is noted.

How do I check and replace the spark plug on my SR 320 or SR 400?

Remove the spark plug boot and use a spark plug wrench to unscrew the plug. Inspect for damage or deposits. Replace if necessary, ensuring the gap is set to 0.02 inches (0.5 mm).

What should I do if my SR 320 or SR 400 is vibrating excessively during operation?

Ensure that all nuts and bolts are tightened securely. Check that the impeller is not damaged or imbalanced. Inspect the entire machine for loose or damaged parts.

How do I properly calibrate the spraying output of my SR 320 or SR 400?

Adjust the metering knob to the desired flow rate. Use the calibration chart provided in the manual to ensure the correct setting for your specific application.

What are the safety precautions to follow when using the SR 320 or SR 400?

Always wear protective gear including goggles, gloves, and hearing protection. Do not operate near open flames or in confined spaces. Ensure the area is clear of bystanders.