Stihl SR 340 SR 420 Instruction Manual

Stihl SR 340 SR 420 manual cover
Pages 86
Year 2006
Language(s)
English en
Spanish sp

Stihl SR 340 SR 420 Specification

The Stihl SR 340 and SR 420 are high-performance backpack mistblowers designed for efficient application of pesticides, herbicides, and fertilizers in agricultural and horticultural settings. Both models are powered by a robust, two-stroke engine, ensuring reliable operation and optimal performance in a variety of conditions. The SR 340 and SR 420 feature a large fuel tank capacity, enabling extended use without frequent refueling, and an ergonomic design that provides comfort during prolonged operation. The SR 340 is equipped with a 10-liter chemical tank, whereas the SR 420 offers a slightly larger capacity of 13 liters, catering to diverse application needs. Both models include a powerful air velocity and volume output ensuring effective coverage over large areas. The machines are designed with ease of use in mind, featuring intuitive controls and a multi-function control handle that allows for easy operation and adjustment. The advanced anti-vibration system minimizes operator fatigue, enhancing comfort and control. Additionally, the SR 420 model includes a more advanced nozzle system, allowing for greater versatility in spray patterns and coverage. These mistblowers are constructed with durable materials, ensuring long-lasting performance and resistance to harsh chemicals. They are ideal for professionals in agricultural sectors seeking efficient and reliable solutions for crop protection and maintenance.

Stihl SR 340 SR 420 F.A.Q.

How do I start the Stihl SR 340/SR 420?

Ensure the fuel tank is filled with the correct fuel mix, set the choke lever to the cold start position, press the fuel pump bulb several times, set the throttle to the start position, and pull the starter rope until the engine fires.

What is the recommended maintenance schedule for the Stihl SR 340/SR 420?

Perform a visual inspection before each use, clean the air filter every 10 hours of operation, replace the spark plug every 100 hours, and conduct a thorough inspection annually.

How do I troubleshoot if the Stihl SR 340/SR 420 won't start?

Check for fuel freshness and proper mixture, ensure the spark plug is clean and properly gapped, inspect the air filter for blockages, and verify that the ignition switch is on.

What type of fuel should be used in the Stihl SR 340/SR 420?

Use a high-quality 2-stroke engine oil mixed with unleaded gasoline at a ratio of 50:1.

How do I clean the air filter on the Stihl SR 340/SR 420?

Remove the air filter cover, take out the filter element, wash it in warm soapy water, rinse thoroughly, allow it to dry completely, and reinstall it.

How can I adjust the carburetor on the Stihl SR 340/SR 420?

Locate the carburetor adjustment screws, use a screwdriver to adjust the idle speed screw (LA) for stable idling, and adjust the low (L) and high (H) speed screws to achieve optimal performance.

What safety precautions should I take when using the Stihl SR 340/SR 420?

Wear protective clothing, including goggles, gloves, ear protection, and a mask; ensure the area is clear of bystanders and pets; and follow all safety instructions in the user manual.

How do I winterize the Stihl SR 340/SR 420?

Drain the fuel tank, run the engine until it stops to clear the carburetor, remove the spark plug, add a few drops of oil into the cylinder, and pull the starter rope to distribute the oil.

What should I do if the Stihl SR 340/SR 420 is vibrating excessively?

Check for loose parts or screws, inspect the fan wheel for damage or imbalance, and ensure the unit is properly balanced and assembled.

Can I use the Stihl SR 340/SR 420 for liquid and granular applications?

Yes, the Stihl SR 340/SR 420 is designed for both liquid and granular applications, but ensure you use the correct nozzles and settings for each type of material.