Stihl P 840 Instruction Manual

Pages 25

Year 1993

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Stihl P 840 Specification

The Stihl P 840 is a robust and highly efficient backpack sprayer designed for professional use in agricultural and horticultural applications. Engineered for durability and user comfort, it features a high-capacity tank with a volumetric capacity of 16 liters, allowing for extended spraying sessions without frequent refills. The tank is constructed from UV-resistant polyethylene, ensuring longevity even in harsh outdoor conditions. The sprayer is equipped with a powerful piston pump capable of generating a maximum pressure of up to 6 bar, facilitating long-range spraying and effective coverage. An ergonomic design is central to the P 840, with padded shoulder straps and a contoured back pad that evenly distribute weight and reduce operator fatigue during prolonged use. The sprayer is fitted with an adjustable brass nozzle, providing precise control over spray patterns and droplet size, which is essential for targeting specific plant areas or achieving a broad application. Additionally, the P 840 includes a robust pressure regulator, allowing users to maintain consistent spray pressure and optimize chemical use efficiency. The lance is constructed from corrosion-resistant materials, ensuring reliable performance and easy maintenance. With a focus on safety and convenience, the P 840 incorporates a large filling aperture for easy refills and a fine-mesh filter to prevent debris from entering the tank. This sprayer is designed to meet the rigorous demands of professionals in the field, combining advanced features with Stihl's reputation for quality and reliability.

Stihl P 840 F.A.Q.

How do I start the Stihl P 840 pressure washer?

To start the Stihl P 840, ensure the power switch is in the 'off' position, connect the water supply, and check that all connections are secure. Turn the water on, then switch the power to 'on' and press the start button.

What should I do if the Stihl P 840 does not start?

If the Stihl P 840 does not start, check the power source, ensure the water supply is on, and inspect the hose and nozzles for clogs or leaks. Also, ensure the unit is not in thermal overload protection mode.

How can I maintain the Stihl P 840 for optimal performance?

Regularly check and clean the nozzles, inspect hoses for wear, and ensure the water filter is clean. Store the pressure washer in a dry place and perform a full service annually.

What is the correct way to clean the nozzle of the Stihl P 840?

To clean the nozzle, turn off the pressure washer, disconnect the water supply, and remove the nozzle. Use a small brush or a nozzle cleaning tool to clear any debris and rinse with clean water before reattaching.

How do I troubleshoot low pressure in the Stihl P 840?

Check for any kinks in the hose, ensure the water supply is adequate, and inspect the nozzle for blockages. Also, verify that the inlet filter is clean and not clogged.

What should I do if the Stihl P 840 leaks water?

Inspect all hose connections for tightness and check for any cracks or wear in the hoses. Replace any damaged components and ensure all seals and O-rings are intact.

How can I safely store the Stihl P 840 when not in use?

Drain all water from the unit and hoses to prevent freezing damage, clean the exterior, and store it in a cool, dry place away from direct sunlight. Consider using a cover for added protection.

What is the recommended cleaning solution for the Stihl P 840?

Use only cleaning solutions specifically designed for pressure washers. Avoid using bleach or corrosive chemicals, as they can damage the unit. Follow the manufacturer's instructions for dilution and application.

How to adjust the pressure settings on the Stihl P 840?

Refer to the user manual for adjusting the pressure settings. Typically, you can adjust the pressure by changing the nozzle or adjusting the pressure regulator knob if available on the model.

What are common safety precautions when using the Stihl P 840?

Always wear protective gear, such as goggles and gloves. Ensure bystanders are at a safe distance, and never aim the pressure washer at people or animals. Follow all safety guidelines in the user manual.