The STIHL MS 251 Parts List PDF is a comprehensive guide detailing components, diagrams, and part numbers for maintenance and repair. It aids users in identifying parts efficiently.
Overview of the STIHL MS 251 Chainsaw
The STIHL MS 251 is a reliable and versatile chainsaw designed for demanding tasks, offering a balance of power and portability. It features a robust 2-stroke engine, anti-vibration system, and ergonomic design for reduced fatigue. Suitable for professionals and homeowners alike, it excels in logging, firewood cutting, and landscaping. The chainsaw is available in standard and C models, with the C version incorporating advanced engine technology for reduced emissions. Its durability and performance make it a popular choice, supported by a comprehensive parts list for easy maintenance and repair.
Importance of the Parts List PDF
The STIHL MS 251 Parts List PDF is essential for accurate identification and ordering of genuine parts, ensuring proper maintenance and repair. It provides detailed diagrams and part numbers, helping users and technicians locate components quickly. This resource prevents incorrect purchases and ensures compatibility, saving time and money. Regularly updated, it reflects the latest specifications, making it indispensable for extending the chainsaw’s lifespan and maintaining performance. The PDF also aids in troubleshooting by clearly identifying potential failure points and required replacements, ensuring optimal functionality and safety of the equipment.
Key Features of the STIHL MS 251 Chainsaw
The STIHL MS 251 features a powerful 45.4 cc engine, HD2 air filter, and lightweight design. It delivers reliable performance for cutting firewood and felling small trees efficiently.
Engine Specifications
The STIHL MS 251 is powered by a 45.4 cc two-stroke engine, requiring a 50:1 ratio of gasoline to STIHL HP Ultra oil. It features a high-torque design, ensuring efficient cutting performance across various applications. The engine’s compact construction minimizes weight while maximizing power output, making it suitable for both professional and homeowner use. Regular oil checks and proper fuel mixing are essential for maintaining optimal engine health and longevity, as detailed in the parts list PDF.
Fuel System and Oil Requirements
The STIHL MS 251 requires a 50:1 mixture of gasoline to STIHL HP Ultra oil for optimal performance. The fuel system includes a carburetor, fuel tank, and manual fuel pump, ensuring reliable engine operation. Regular inspection of fuel lines, connections, and the pump is crucial to prevent leaks and maintain efficiency. The parts list PDF provides detailed diagrams for servicing and replacing fuel system components, ensuring proper maintenance and longevity of the chainsaw’s engine.
Chain and Bar Compatibility
The STIHL MS 251 parts list PDF outlines compatible chains and bars, ensuring optimal performance. Chains like PMM3 or PMX in lengths of 16″ or 18″ are recommended. The PDF provides exploded diagrams and part numbers for chain and bar assemblies, helping users identify the correct components. Proper compatibility ensures efficient cutting and safety. Always refer to the PDF for specific recommendations to maintain performance and avoid damage to the saw.
Technical Specifications of the STIHL MS 251
The STIHL MS 251 features a powerful 2.2 kW engine, weighing 4.6 kg. Its compact design and robust build make it ideal for demanding tasks, ensuring reliability and durability;
Weight and Dimensions
The STIHL MS 251 weighs approximately 4.6 kg, making it lightweight yet robust. Its compact design ensures easy handling and maneuverability. Dimensions are optimized for balance and control, with a total length of around 35 cm. The chainsaw’s ergonomic design reduces fatigue during extended use. For precise measurements, consult the official parts list PDF, which details exact specifications for every component, ensuring accurate maintenance and repairs. This information is crucial for users seeking to understand the chainsaw’s physical characteristics and operational capabilities.
Power Output and Performance
The STIHL MS 251 delivers impressive power output, featuring a high-torque engine that ensures efficient cutting performance. With a maximum engine speed of 13,500 RPM, it provides reliable power for demanding tasks. The chainsaw’s advanced combustion system optimizes fuel efficiency while maintaining strong performance. Its 2.3 kW engine offers consistent power delivery, making it suitable for both professional and residential use. The combination of high RPM and robust torque enables smooth operation, even in challenging cutting conditions, ensuring precise and effective results for various woodworking applications.
Safety Features
The STIHL MS 251 incorporates essential safety features to ensure operator protection. The chain brake system is designed to stop the chain instantly in case of kickback, preventing accidents. Additionally, the chainsaw features a protective hand guard to shield the user’s hands from debris. The engine housing is built with durable materials to withstand rough conditions, while the ergonomic design reduces vibration, enhancing control and reducing fatigue. These features collectively ensure a safer and more reliable cutting experience, making the MS 251 a dependable tool for both professionals and homeowners.
Understanding the Parts List PDF
The STIHL MS 251 Parts List PDF provides a detailed overview of components, including exploded diagrams and part numbers. It aids in identifying and ordering replacement parts efficiently.
How to Navigate the PDF Document
The STIHL MS 251 Parts List PDF is structured for easy navigation. It typically begins with a table of contents, allowing users to quickly locate specific sections. The document features detailed exploded diagrams of major components, such as the engine housing, cylinder, and muffler. Each part is labeled with corresponding numbers, which are cross-referenced in the parts list. Users can zoom in on diagrams for clarity and use the search function to find specific part numbers or descriptions. This organized format ensures efficient identification and ordering of replacement parts.
Interpreting the Exploded View Diagrams
The STIHL MS 251 Parts List PDF includes exploded view diagrams that visually disassemble the chainsaw into its components. These diagrams are essential for identifying parts and their relationships. Each component is numbered and labeled, corresponding to the parts list. Users can identify major assemblies, such as the engine housing, cylinder, and muffler, and their respective subparts. The diagrams also highlight interfaces and connections, aiding in reassembly. By referencing these visuals, users can accurately locate and order replacement parts, ensuring precise maintenance and repair.
Locating Specific Parts and Numbers
To locate specific parts and numbers in the STIHL MS 251 Parts List PDF, users can utilize the comprehensive index or search function. Each part is assigned a unique identifier, which corresponds to its position in the exploded diagrams. By referencing the table of contents or the detailed cross-reference sections, users can quickly identify components like the chain sprocket or engine housing. The parts list provides exact numbers and descriptions, ensuring accurate identification and ordering of replacements. This systematic approach simplifies maintenance and repair tasks.
Major Components of the STIHL MS 251
The STIHL MS 251 includes key components like the engine housing, cylinder, muffler, clutch, and chain sprocket. These parts are essential for its operation and performance.
Engine Housing and Components
The engine housing of the STIHL MS 251 is a durable, high-quality component designed to protect internal engine parts. It is constructed from robust materials to ensure longevity and resistance to wear. The housing encases critical components such as the crankshaft, which converts piston movement into rotational energy. Proper maintenance of the engine housing is essential to prevent damage and ensure optimal performance. The crankshaft, a key part within the housing, plays a vital role in the chainsaw’s operation, making it a focus for inspection and potential servicing. This component is crucial for both professional and homeowner use.
Cylinder, Muffler, and Crankshaft
The cylinder of the STIHL MS 251 is engineered for efficient combustion and power delivery. The muffler reduces noise levels while ensuring optimal exhaust flow. The crankshaft, a critical component, converts linear piston motion into rotational energy. Together, these parts ensure smooth engine operation. Regular inspection and maintenance, as outlined in the parts list PDF, are crucial to prevent wear and tear. Replacing these components when necessary ensures the chainsaw runs reliably and maintains its performance over time.
Fuel System and Carburetor
The STIHL MS 251’s fuel system is designed for efficient fuel delivery, ensuring consistent engine performance. The carburetor regulates the fuel-air mixture, optimizing combustion. Regular inspection of fuel lines, hoses, and connections is essential to prevent leaks. The parts list PDF provides detailed diagrams and part numbers for components like the manual fuel pump and fuel tank. Proper maintenance, such as cleaning or replacing the air filter and checking the muffler, ensures the fuel system operates at peak efficiency, reducing the risk of engine issues and prolonging the chainsaw’s lifespan.
Clutch and Chain Sprocket Assembly
The clutch and chain sprocket assembly on the STIHL MS 251 is crucial for smooth chain operation. The clutch engages the chain when engine RPM increases, preventing kickback. The sprocket drives the chain, ensuring consistent cutting performance. The parts list PDF details components like the clutch drum, sprocket, and bearing. Regular inspection and maintenance, such as cleaning and lubricating, are vital to ensure optimal function. Replacing worn parts promptly prevents chain slippage and maintains efficiency, keeping the chainsaw operating safely and effectively.
Maintenance and Repair Using the Parts List
The parts list PDF is essential for identifying components and performing repairs. It provides clear guidelines for replacing parts, ensuring proper maintenance and extending the chainsaw’s lifespan.
Replacing the Chain and Bar
Replacing the chain and bar on your STIHL MS 251 is straightforward using the parts list PDF. Identify the correct chain and bar models from the exploded diagrams. Ensure compatibility with your saw’s specifications. Refer to the PDF for part numbers and torque specifications. Remove the old chain and bar, then install the new ones, ensuring proper alignment and tension. Regular chain replacement maintains performance and safety. Always follow the manufacturer’s guidelines for installation and maintenance to prolong the life of your chainsaw.
Servicing the Fuel System
Servicing the fuel system of the STIHL MS 251 involves checking for leaks, especially around the filler cap, hoses, and manual fuel pump. Use the parts list PDF to identify components like the fuel tank, hoses, and carburetor. Inspect and clean or replace the fuel filter as needed. Ensure proper fuel-to-oil mixture (50:1) and refer to the PDF for exploded views of fuel system parts. Regular maintenance prevents fuel-related issues and ensures optimal performance. Always follow manufacturer guidelines for servicing to maintain reliability and safety.
Inspecting and Replacing the Air Filter
Regular inspection and replacement of the air filter are essential for the STIHL MS 251’s performance. Locate the filter using the parts list PDF, which provides diagrams and part numbers. Clean the filter gently or replace it if damaged. Refer to the PDF for correct part identification and installation procedures. A dirty or damaged air filter can reduce engine efficiency and lead to startup issues. Use genuine STIHL parts to ensure compatibility and reliability. Proper maintenance extends the chainsaw’s lifespan and maintains optimal functionality.
Troubleshooting Common Issues
The STIHL MS 251 Parts List PDF aids in diagnosing issues by referencing exploded diagrams and part numbers, helping users identify and resolve common problems efficiently.
Identifying Faulty Parts Using the PDF
The STIHL MS 251 Parts List PDF provides detailed exploded diagrams and part numbers, enabling users to locate and identify faulty components quickly. By cross-referencing symptoms with the diagrams, users can pinpoint issues such as engine malfunction or chain brake failures. The PDF lists specific parts associated with each system, making it easier to diagnose problems. This resource is essential for troubleshooting, ensuring accurate repairs and minimizing downtime. It streamlines the process of identifying worn or damaged parts, helping users address issues efficiently and effectively.
Resolving Engine Startup Problems
Engine startup issues with the STIHL MS 251 can often be traced to the fuel system or ignition components. Check the fuel lines, filter, and tank for blockages or leaks. Ensure the spark plug is clean and properly gapped. If the spark plug is fouled, replace it with a genuine STIHL spark plug. Consult the parts list PDF to verify correct part numbers. Additionally, inspect the air filter and clean or replace it if dirty. If issues persist, refer to the PDF for guidance on carburetor adjustment or replacement. This ensures quick and accurate troubleshooting to restore engine function.
Addressing Chain Brake Malfunctions
Chain brake malfunctions on the STIHL MS 251 can be resolved by inspecting the brake components. Check the brake handle, spring, and pawl for wear or damage. Ensure the brake band is properly aligned and free from debris. Refer to the parts list PDF for exploded diagrams to locate specific parts. If the brake fails to engage, replace the faulty components using genuine STIHL parts. Lubricate moving parts and test the brake function after repairs. Always consult the PDF for torque specifications and assembly instructions to ensure proper functionality and safety.
Downloading and Accessing the PDF
The STIHL MS 251 Parts List PDF is available on official STIHL websites and authorized dealer portals. Ensure authenticity by downloading from trusted sources only.
Official STIHL Websites and Resources
Access the STIHL MS 251 Parts List PDF directly from STIHL’s official website or authorized dealer portals. These resources provide authentic, detailed diagrams and part numbers. Ensure reliability by downloading from trusted sources like STIHL’s official service manuals section. The PDF includes exploded views, part descriptions, and compatibility information. Regular updates guarantee accuracy for maintenance and repairs. Always verify the source to avoid counterfeit or outdated documents, ensuring your STIHL MS 251 operates safely and efficiently.
Authorized Dealers and Support
Authorized STIHL dealers provide authentic access to the MS 251 Parts List PDF, ensuring genuine and reliable information. These dealers offer comprehensive support, including maintenance guides and troubleshooting tips. They also supply original parts, guaranteeing compatibility and quality. For complex repairs, authorized dealers provide expert assistance, reducing downtime. Their resources include detailed exploded diagrams and part numbers, aiding accurate identification. Visit authorized STIHL dealers for trusted support and genuine documents to maintain your MS 251 chainsaw effectively and safely.
Third-Party Sources for the Parts List
Third-party sources offer the STIHL MS 251 Parts List PDF through platforms like eBay, Amazon, and specialized forums. These sources provide convenient access to exploded diagrams, part numbers, and maintenance guides. However, verify the authenticity and accuracy of the documents to ensure compatibility. Some third-party sites may also offer additional resources, such as repair manuals and troubleshooting guides. Be cautious of unauthorized sellers to avoid counterfeit or outdated information. Always cross-check with official STIHL resources for reliability and safety.