stihl ms 251 manual
The Stihl MS 251 manual is a comprehensive guide for operating and maintaining the chainsaw. It covers safety precautions, technical specifications, and maintenance tips, ensuring optimal performance and longevity of the tool. Download the PDF manual for detailed instructions.
Overview of the Stihl MS 251 Chainsaw
The Stihl MS 251 is a powerful and reliable chainsaw designed for demanding cutting tasks; It features a robust two-stroke engine with reduced emission technology, ensuring efficient fuel consumption and lower environmental impact. The saw is equipped with a high-performance carburetor and electronic ignition system for consistent power delivery. Weighing approximately 4.9 kg, it balances portability with durability, making it suitable for both professional and homeowner use. The MS 251 includes innovative features like the Easy2Start system, which simplifies engine starting, and a manual fuel primer for cold starts. Additionally, the chainsaw boasts a quick chain adjuster, allowing users to tighten the chain without tools. Its compact design and ergonomic handle provide excellent control and comfort during extended use. The saw is ideal for logging, firewood cutting, and landscaping tasks. The manual emphasizes proper usage techniques and maintenance to ensure optimal performance and longevity of the tool.
Safety Precautions and Guidelines
Always wear protective gear, including gloves, safety glasses, and a helmet. Be aware of reactive forces and kickback. Follow proper starting procedures and ensure the chain brake is functional. Never operate the saw near bystanders or in unsafe conditions.
Understanding Pictograms and Warning Symbols
The Stihl MS 251 manual includes various pictograms and warning symbols to ensure safe and proper use of the chainsaw. These symbols are designed to alert users to potential hazards and provide clear instructions for operation and maintenance.
Common symbols include warnings for cutting operations, proper handling, and protective equipment. For example, a pictogram of a hand with a chain saw indicates proper grip and control. Another symbol, a helmet with glasses, emphasizes the need for safety gear.
Understanding these symbols is crucial for avoiding accidents and ensuring compliance with safety guidelines. The manual explains each symbol in detail, making it easier for users to interpret and follow critical safety instructions. Always refer to the manual for clarification if a symbol is unclear.
By familiarizing yourself with these pictograms, you can operate the Stihl MS 251 safely and effectively, minimizing risks associated with chainsaw use. Regularly review the symbols to maintain awareness and adhere to best practices.
Technical Specifications and Features
The Stihl MS 251 features a powerful two-stroke engine, delivering efficient performance for cutting tasks. It includes a robust fuel system, an advanced chain brake for safety, and a compact design for easier handling. The saw also offers adjustable features like the Easy2Start system and a high-performance bar and chain combination, ensuring precise cuts and durability. This model is designed for reliability and versatility, making it suitable for both professional and homeowner use. The technical specifications ensure optimal performance in various cutting conditions, while the lightweight construction reduces user fatigue during extended operations.
Engine Details and Fuel System Overview
The Stihl MS 251 is equipped with a high-performance, two-stroke engine designed for efficient power delivery. The engine features a robust crankshaft and piston system, ensuring smooth operation and durability. The fuel system includes a diaphragm carburetor that provides consistent fuel flow, optimizing engine performance across various cutting conditions. The MS 251 also incorporates Stihl’s innovative stratified scavenging engine technology, which reduces emissions and improves fuel efficiency. The engine’s electronic ignition system ensures reliable starts and consistent combustion. Additionally, the saw features a manual fuel primer pump, allowing users to easily prime the engine before starting. The engine’s compact design contributes to the saw’s overall lightweight and balanced feel, making it easier to maneuver during extended cutting tasks. Regular maintenance of the engine and fuel system, as outlined in the manual, is essential to maintain peak performance and extend the lifespan of the chainsaw. By following the recommended service intervals and using genuine Stihl parts, users can ensure their MS 251 continues to deliver exceptional results. The engine and fuel system are critical components that drive the saw’s performance, making them central to its operation and maintenance. This overview provides a foundation for understanding and caring for these essential systems.
Operating Instructions
The Stihl MS 251 manual provides detailed steps for starting the engine, using controls, and performing cutting tasks safely. It emphasizes proper techniques, safety precautions, and adherence to guidelines for efficient and effective operation. Always consult the manual for specific instructions.
Starting the Engine and Basic Cutting Techniques
To start the Stihl MS 251 chainsaw, engage the chain brake for safety. Prime the fuel system by pressing the primer bulb several times to draw fuel into the carburetor. Set the choke to the start position and pull the starter cord firmly until the engine starts. Allow the saw to warm up briefly before use.
For basic cutting, stand at a slight angle to the material, holding the saw firmly at hip level. Use the saw’s weight to guide the cut, applying gentle to moderate pressure. Keep the chain well-lubricated to prevent overheating and ensure smooth operation.
Maintain control by gripping the saw correctly and keeping your body balanced. Always wear protective gear, including gloves, safety glasses, and sturdy clothing. Be mindful of your surroundings, ensuring the area is clear of obstacles and bystanders.
Avoid applying excessive pressure, which can lead to loss of control. Instead, let the chain do the work, moving steadily through the material. Keep the chain sharp, as a dull chain can make cutting more difficult and increase the risk of accidents.
By following these steps and techniques, you can operate the Stihl MS 251 safely and effectively, ensuring optimal performance and longevity of the chainsaw.
Maintenance and Servicing
Regular maintenance ensures optimal performance and longevity of the Stihl MS 251 chainsaw. Perform routine checks on the chain, bar, and engine. Sharpen the chain when dull and lubricate moving parts. Replace worn or damaged components promptly; Refer to the manual for specific servicing intervals and guidelines.
Regular Checks and Chain Sharpening
Regular checks are essential to ensure the Stihl MS 251 operates safely and efficiently. Inspect the chain for wear, damage, or dullness. Sharpen the chain using a file or sharpening tool, maintaining the correct angle and depth. Check the bar for alignment and lubrication, replacing the bar if worn. Ensure proper chain tension to prevent derailment. Lubricate the saw’s moving parts regularly to reduce friction and wear. Clean or replace the air filter and spark plug as needed to maintain engine performance. Refer to the manual for specific sharpening techniques and maintenance schedules. Proper chain sharpening enhances cutting efficiency and prolongs the life of the saw. Always follow safety guidelines during maintenance to avoid accidents. Regular servicing ensures the chainsaw remains reliable and performs optimally for various cutting tasks. By adhering to these checks, users can maximize the tool’s efficiency and extend its lifespan. Proper maintenance is crucial for both safety and performance.