The STIHL MS 251 is a powerful‚ two-cycle engine chainsaw designed for reliability and efficiency. Ideal for professionals and homeowners‚ it offers easy operation and maintenance. The manual ensures safe and effective use‚ highlighting its eco-friendly features and robust design.
1.1 Overview of the STIHL MS 251 Chainsaw
The STIHL MS 251 is a robust‚ two-cycle engine chainsaw designed for reliability and high performance. It features the innovative Easy2Start system‚ reducing effort for a quick start. With a powerful engine and lightweight design‚ it is suitable for both professionals and homeowners. The saw includes advanced safety features like the chain brake and is built for efficient cutting in various conditions. Its compact design and durable construction make it ideal for demanding tasks while ensuring ease of maintenance and operation.
1.2 Importance of the Manual for Safe and Effective Use
The manual is essential for understanding safety guidelines‚ proper operation‚ and maintenance of the STIHL MS 251. It provides critical information on handling reactive forces‚ interpreting pictograms‚ and environmental considerations. Adhering to the manual ensures safe use‚ prevents accidents‚ and prolongs the chainsaw’s lifespan. It also outlines eco-friendly features and responsible disposal practices‚ making it a vital resource for both professionals and homeowners to operate the device effectively and sustainably.
Safety Precautions and Warnings
Safety precautions are critical when operating the STIHL MS 251. Always wear protective gear‚ understand pictograms‚ and manage reactive forces to prevent accidents and ensure safe use.
2.1 General Safety Guidelines
Always follow safety guidelines when operating the STIHL MS 251. Wear protective gear‚ including gloves‚ safety glasses‚ and sturdy footwear. Ensure the chain brake is functioning properly and understand reactive forces. Keep loose clothing tied back and avoid distractions. Maintain a firm grip on the handles and never cut above shoulder height. Regularly inspect the chain for sharpness and damage. Be aware of your surroundings and ensure bystanders are at a safe distance. Never modify the saw or ignore safety warnings‚ as this can lead to serious injury. Consult the manual or a STIHL dealer if instructions are unclear.
2.2 Understanding Pictograms and Symbols on the Device
The STIHL MS 251 features various pictograms and symbols to ensure safe operation. These include warnings‚ cautions‚ and operational guides. For example‚ the chain brake symbol indicates how to stop the chain in emergencies‚ while other symbols highlight proper cutting techniques and safety gear requirements. All symbols are explained in the manual to prevent misunderstandings. Familiarize yourself with these markings‚ as they are critical for safe and effective use of the chainsaw. If unclear‚ consult the manual or contact a STIHL dealer.
2.3 Reactive Forces and Their Management
Reactive forces‚ such as kickback‚ occur when the chain tooth edge contacts an object unintentionally. The STIHL MS 251 is designed to minimize these forces through proper technique and safety features like the chain brake. Understanding and managing reactive forces is crucial for safe operation. Always maintain a firm grip‚ avoid overreaching‚ and follow the manual’s guidelines to reduce the risk of accidents. Proper training and awareness ensure effective control of the saw during use. If unsure‚ consult the manual or a STIHL professional immediately.
Technical Description of the STIHL MS 251
The STIHL MS 251 features a high-performance two-cycle engine with electronic magneto ignition and a diaphragm carburetor. Its robust design includes a chain brake and advanced fuel system for optimal performance.
3.1 Engine Specifications (Two-Cycle Engine)
The STIHL MS 251 is equipped with a powerful two-cycle engine‚ featuring an electronic magneto ignition system for reliable starts. The engine utilizes a diaphragm carburetor‚ ensuring consistent fuel delivery and optimal performance. Designed for durability‚ the engine is built to handle demanding tasks while maintaining efficiency. Its compact design and lightweight construction make it ideal for both professional and residential use‚ providing the power needed for cutting through various materials effectively.
3.2 Fuel System and Ignition
The STIHL MS 251 features a robust fuel system with an all-position diaphragm carburetor‚ ensuring consistent fuel delivery regardless of the saw’s orientation. The electronic magneto ignition system provides reliable starts and optimal engine performance. A manual fuel primer is included for easier cold starting‚ enhancing user convenience. The fuel system is designed for efficiency‚ reducing emissions while maintaining power. Regular maintenance of the air filter and carburetor is essential for sustained performance and longevity of the engine.
3.3 Chain Brake and Safety Features
The STIHL MS 251 is equipped with a reliable chain brake system that stops the saw chain in milliseconds‚ significantly reducing the risk of injury. The manual details how to engage and release the brake‚ emphasizing its importance in emergency situations. Additional safety features include protective gear recommendations and clear warnings. The manual also explains pictograms and symbols on the device‚ ensuring users understand safety protocols. These features enhance control and minimize hazards during operation‚ aligning with STIHL’s commitment to user safety and accident prevention.
Operating the Chainsaw
This section covers pre-operation checks‚ starting procedures‚ and techniques for efficient‚ safe cutting. It ensures optimal performance and user safety during operation.
4.1 Pre-Operation Checks and Preparation
Before operating the STIHL MS 251‚ ensure all safety gear is worn‚ including gloves‚ goggles‚ and protective clothing. Inspect the chain for sharpness and proper tension‚ and check the chain brake function. Verify the fuel level and mix‚ ensuring it meets the recommended specifications. Activate the chain brake and use the manual fuel primer to prepare the engine for starting. Always refer to the manual for detailed steps to ensure safe and efficient preparation.
4.2 Starting the Engine (Including Easy2Start)
To start the STIHL MS 251‚ move the master control lever to the cold start position and press the primer bulb 2-3 times. Pull the starter handle gently until resistance is felt‚ then pull firmly to engage the engine; Once started‚ return the master control lever to the idle position and allow the engine to warm up. The Easy2Start system reduces effort‚ making startups easier. Always follow manual guidelines for safe and proper engine starting procedures.
4.3 Working Techniques for Efficient Cutting
For efficient cutting with the STIHL MS 251‚ maintain proper stance‚ grip‚ and saw balance. Use steady‚ controlled motions‚ applying gentle to moderate pressure. Keep the chain sharp to minimize effort and prevent overheating. Ensure the cutting motion is smooth‚ using the saw’s weight to assist. Avoid overtaxing the engine by maintaining optimal RPM and using the correct technique for different materials. Always prioritize safety and efficiency‚ following the manual’s guidelines for precise and effective cutting operations.
Chain and Bar Maintenance
Regular chain sharpening and bar lubrication are essential for optimal performance. Proper mounting ensures alignment and safety. Follow manual guidelines for effective maintenance and longevity.
5.1 Proper Sharpening of the Chain
Proper sharpening of the chain is crucial for efficient cutting and safety. Use a sharpening file or grinder specifically designed for chain teeth. Always maintain the correct angle and depth to ensure optimal performance. Refer to the manual for detailed instructions on sharpening techniques and tool recommendations. Regular sharpening prevents wear and tear‚ ensuring precise cuts and prolonging chain life. Sharpening correctly also reduces the risk of kickback and improves overall chainsaw functionality.
5.2 Mounting the Bar and Chain
Mounting the bar and chain on the STIHL MS 251 requires careful attention to ensure proper alignment and tension. Begin by loosening the bar nuts with a wrench‚ then adjust the chain tension using the tensioning screw until the chain fits snugly but still rotates freely. Align the bar and chain according to the manual’s guidelines for optimal performance. Tighten the bar nuts securely‚ following torque specifications‚ to prevent damage or misalignment. Always refer to the manual for precise instructions and safety guidelines.
5.3 Lubrication and Maintenance Tips
Regular lubrication is essential for the STIHL MS 251’s longevity. Use high-quality STIHL bar oil to ensure the chain and bar remain well-lubricated‚ reducing wear and tear. Check the oil reservoir daily and refill as needed. Clean or replace the air filter regularly to maintain engine performance; Sharpen the chain frequently and clean debris from the chain brake. Inspect the chain and bar for wear and damage‚ replacing them when necessary. Refer to the manual for specific oil quantities and maintenance intervals to keep your chainsaw running efficiently and safely.
Servicing and Troubleshooting
Regular servicing ensures optimal performance and longevity. Troubleshooting common issues like chain tension and ignition problems is simplified with the STIHL MS 251 service manual.
6.1 Routine Maintenance Tasks
Regular servicing is essential for optimal performance. Check chain tension‚ clean or replace air filters‚ and ensure proper lubrication of moving parts. Follow the service manual for guidance on tasks like spark plug replacement and muffler cleaning. Regularly inspect and maintain the chain brake and anti-vibration system. Lubricate the bar and chain frequently to prevent wear. Always refer to the manual for specific intervals and procedures to ensure longevity and safety of the STIHL MS 251 chainsaw.
6.2 Common Issues and Solutions
Addressing common issues ensures optimal performance. Poor engine performance may result from a dirty air filter or incorrect fuel mixture. Chain issues‚ such as dull cutting‚ can be resolved by sharpening or replacing the chain. If the chainsaw doesn’t start‚ check the spark plug and ensure proper priming. Refer to the manual for troubleshooting guides. Regular maintenance and correct storage can prevent many issues. Always follow STIHL’s recommendations for resolving problems safely and effectively.
6.3 Tightening Torques and Technical Specifications
The STIHL MS 251 manual provides essential technical specifications and tightening torques for optimal performance. Key details include the two-cycle engine‚ fuel system specifications‚ and chain brake features. Always refer to the official service manual for precise torque values to ensure safety and proper maintenance. Adhering to these guidelines is crucial for the longevity and efficient operation of the chainsaw.
Environmental Considerations
The STIHL MS 251 features eco-friendly designs to reduce emissions and environmental impact. Proper use and disposal guidelines ensure responsible operation‚ aligning with sustainability practices.
7.1 Eco-Friendly Features of the STIHL MS 251
The STIHL MS 251 incorporates advanced two-cycle engine technology‚ reducing emissions and environmental impact. Its design emphasizes fuel efficiency and lower emissions‚ making it an eco-conscious choice. The chainsaw’s lightweight construction and optimized performance contribute to reduced fuel consumption. Additionally‚ proper maintenance practices outlined in the manual ensure minimal environmental disruption during operation and disposal.
7.2 Responsible Use and Disposal Guidelines
Responsible use of the STIHL MS 251 involves adhering to local environmental regulations and minimizing waste. Proper disposal requires separating recyclable parts and safely handling hazardous materials like batteries and fuel. Users should consult STIHL dealers or environmental authorities for guidance. Regular maintenance ensures optimal performance and reduces ecological impact; Disposal should follow eco-friendly practices to protect the environment and comply with legal standards‚ promoting sustainability and resource conservation.
Frequently Asked Questions (FAQs)
Discover answers to common questions about the STIHL MS 251‚ including operation‚ maintenance‚ and troubleshooting‚ to ensure optimal performance and safety.
8.1 Common Queries About the STIHL MS 251
Users often ask about starting the engine‚ chain sharpening‚ and managing reactive forces. The manual addresses these topics‚ ensuring safe and efficient operation. FAQs also cover eco-friendly features‚ maintenance tips‚ and troubleshooting common issues. Clarifications on warranty terms and service options are included to provide comprehensive support. Refer to the manual for detailed explanations and consult STIHL dealers for unresolved concerns.
8.2 Clarifications on Warranty and Service
The STIHL MS 251 warranty covers defects in materials and workmanship under normal use. Contact authorized dealers for service inquiries or repairs. Warranty terms vary by region‚ so refer to the manual for specifics. Regular maintenance by STIHL-approved technicians ensures compliance with warranty conditions. For service‚ contact local distributors or dealers‚ who provide genuine parts and expert support. Proper documentation and adherence to guidelines are essential for warranty claims.
Warranty and Support Information
The STIHL MS 251 is backed by a warranty covering defects in materials and workmanship. Contact authorized dealers for service inquiries or repairs. Refer to the manual for warranty terms and regional specifics.
9.1 Warranty Terms and Conditions
The STIHL MS 251 is covered by a comprehensive warranty program‚ ensuring protection against defects in materials and workmanship. The warranty period and conditions vary by region and are outlined in the manual. Proper maintenance and adherence to guidelines are essential to maintain warranty validity. Owners should contact authorized STIHL dealers for warranty service or repairs. Always refer to the official manual or contact STIHL support for detailed terms and regional specifics to avoid any coverage issues.
9.2 Contacting STIHL Dealers and Distributors
For service‚ parts‚ or support‚ contact authorized STIHL dealers or distributors. They provide professional assistance‚ genuine parts‚ and warranty services. The manual includes contact details‚ and you can visit the STIHL website to locate dealers near you. Ensure to use official channels for authentic support and compliance with warranty terms. Dealers offer expertise tailored to the MS 251‚ ensuring optimal performance and safety. Always verify dealer authorization to avoid unauthorized services and maintain your chainsaw’s quality.