Overview of the Stihl MS 251 Chainsaw
The Stihl MS 251 chainsaw is a versatile and powerful tool designed for professional and homeowner use. It features a robust engine, advanced carburetor, and durable components.
The Stihl MS 251 is a high-performance chainsaw designed for both professionals and homeowners. Known for its reliability and efficiency, it features a powerful engine and advanced components. Built with durability in mind, the MS 251 incorporates Stihl’s innovative technologies, such as an anti-vibration system and a single-lever master control. Its compact design and robust construction make it ideal for a variety of cutting tasks, ensuring optimal performance in demanding environments. This model is a popular choice for its balance of power and precision.
1.2 Key Features and Specifications
The Stihl MS 251 chainsaw is equipped with a powerful engine, advanced Zama carburetor, and a single-lever master control for easy operation. It features an anti-vibration system for reduced fatigue and an Ematic chain lubrication system for optimal performance. The chainsaw is known for its durability and precision, making it suitable for various cutting tasks. Its compact design and robust construction ensure reliability in demanding environments. The MS 251 also boasts a parts list PDF for easy maintenance and repair reference.
Key Components of the Stihl MS 251
The Stihl MS 251 includes essential components like engine housing, cylinder, muffler, crankshaft, oil pump, clutch, and chain sprocket, ensuring efficient operation and durability.
2.1 Engine Housing and Components
The engine housing of the Stihl MS 251 is a durable, high-strength component that encases the engine, protecting it from external damage. Made from robust materials, it ensures longevity and reliability.
Key components within the housing include the cylinder, crankshaft, and muffler, all designed for efficient performance. Regular maintenance of these parts is crucial to maintain optimal engine function and prevent overheating.
2.2 Cylinder, Muffler, and Crankshaft
The cylinder of the Stihl MS 251 is precision-engineered for optimal combustion efficiency and durability. The muffler is designed to reduce noise levels while maintaining proper engine airflow.
The crankshaft converts reciprocating piston motion into rotational energy, ensuring smooth operation. These components are crafted from high-strength materials to withstand heavy use. Regular inspection and maintenance of these parts are essential to prevent overheating and ensure prolonged engine life. Proper lubrication and cleaning of the muffler are also crucial to maintain performance.
Oil Pump, Clutch, and Chain Sprocket
The oil pump ensures consistent chain lubrication, while the clutch and chain sprocket work together to drive the saw chain efficiently. Proper maintenance is crucial.
3.1 Oil Pump Components
The oil pump in the Stihl MS 251 chainsaw is a critical component for chain lubrication. It comprises a pump housing, oil reservoir, and delivery lines. These parts work together to ensure a steady oil flow to the bar and chain. Regular inspection and cleaning of the oil pump are essential to prevent clogs and maintain optimal performance. Referencing the parts list PDF can help identify and replace worn or damaged components efficiently.
3.2 Clutch and Chain Sprocket Details
The clutch system on the Stihl MS 251 chainsaw includes a centrifugal clutch and clutch drum, ensuring smooth engagement of the cutting chain. The chain sprocket, connected to the engine, drives the chain via a gear mechanism. Proper alignment and lubrication of these components are vital for efficient operation. Regular inspection and replacement of worn parts, as outlined in the parts list PDF, help maintain performance and extend the chainsaw’s lifespan. This system is designed for durability and reliable cutting under various conditions.
Carburetor and Fuel System
The Stihl MS 251 features a Zama carburetor, ensuring precise fuel delivery for optimal performance. The fuel system is designed for efficient combustion and reliability, with parts detailed in the PDF.
The Zama carburetor in the Stihl MS 251 ensures efficient fuel delivery, enhancing performance and reliability. It replaces the older Walbro model, offering improved combustion efficiency. The PDF parts list provides detailed schematics and component identifiers, aiding in maintenance and repairs. This upgrade ensures consistent engine operation, reducing emissions and improving overall chainsaw functionality. Users can easily reference the PDF guide to locate and order genuine Stihl carburetor parts, ensuring optimal performance and longevity of the tool. Regularly inspect and clean the fuel filter to ensure proper fuel flow. Check fuel lines for cracks or damage and replace them if necessary. Use the correct fuel type as specified in the manual to avoid engine damage. Draining old fuel before storage prevents degradation. Refer to the PDF parts list for guidance on cleaning or replacing components like the carburetor and fuel tank. Proper maintenance ensures optimal performance and extends the chainsaw’s lifespan. The chain brake system is a critical safety feature designed to stop the chain instantly during kickback or manual activation. It enhances user protection and operational control. The chain brake system on the Stihl MS 251 consists of several key components, including the brake band, handle, spring, damping element, and mounting screws. These parts work together to provide reliable and immediate chain stopping in emergency situations. The brake band encircles the clutch drum, while the handle activates the mechanism. Proper maintenance of these components ensures optimal safety and functionality. Referencing the parts list PDF helps identify and replace worn or damaged elements effectively. Regular inspection is crucial for maintaining performance. The Stihl MS 251 chainsaw is equipped with a robust chain brake system designed to enhance safety. The chain brake activates instantly in case of kickback, stopping the chain within milliseconds. This feature is critical for protecting the operator from injury. The system is integrated with the front handle, ensuring easy activation and reliable functionality. Regular checks and maintenance of these components are essential to ensure optimal performance and safety. The chain brake is a key element in preventing accidents during operation. The Stihl MS 251 parts list PDF provides detailed diagrams and component lists. Use it to identify and locate specific parts for maintenance or repair efficiently. The Stihl MS 251 parts list PDF is organized into sections for easy navigation. Start with the table of contents to locate specific components, such as engine housing or cylinder parts. Use bookmarks to quickly jump to sections like “Carburetor” or “Chain Brake.” Exploded diagrams provide visual guidance, while numbered lists match parts to their corresponding codes. Use the search function to find specific items by name or part number, ensuring efficient identification and ordering of replacement parts. To find specific parts in the Stihl MS 251 parts list PDF, use the table of contents or search function. Enter the part name or number to quickly locate it. Each component, such as the carburetor or chain brake, is listed with corresponding diagrams. Exploded views show parts in context, while numbered lists provide exact codes. This system ensures accurate identification and ordering of replacement parts, streamlining maintenance and repair processes for users. Regularly check chain tension, clean air filters, and lubricate moving parts. Refer to the PDF for specific repair guidance and diagrams to ensure proper maintenance.
A regular maintenance schedule ensures optimal performance of the Stihl MS 251 chainsaw. Daily checks include inspecting the chain for sharpness and tension, cleaning air filters, and lubricating the bar and chain. Every 10 hours of use, clean or replace the air filter and check the muffler for damage. Replace spark plugs and check the chain brake every 50 hours. Refer to the parts list PDF for specific components and procedures to maintain your chainsaw effectively. Regular maintenance prolongs the tool’s lifespan and ensures safety. For DIY repairs on the Stihl MS 251 chainsaw, consult the parts list PDF to identify specific components needing replacement. Common repairs include replacing the chain brake, servicing the oil pump, and cleaning or replacing the carburetor. Always use genuine Stihl parts to ensure compatibility and performance. Before starting, refer to the exploded diagrams in the PDF for guidance on disassembling and reassembling components. Follow safety guidelines and manufacturer instructions to avoid damage or injury. Regular DIY maintenance can extend the chainsaw’s lifespan and maintain its efficiency. Genuine Stihl parts ensure superior quality, durability, and compatibility with the MS 251 chainsaw. They maintain warranty validity and performance, while counterfeit parts can compromise safety and functionality. Genuine Stihl parts offer unmatched quality and reliability, specifically designed for the MS 251 chainsaw. They ensure optimal performance, longevity, and safety. Using authentic components maintains the chainsaw’s warranty and prevents potential damage from inferior materials. Genuine parts are engineered to precise specifications, guaranteeing seamless compatibility and reliability. This reduces the risk of malfunctions and extends the tool’s lifespan, making them a worthwhile investment for professionals and homeowners alike. Always choose genuine parts for consistent and durable performance. To ensure optimal performance and safety, always use genuine Stihl parts for your MS 251 chainsaw. Counterfeit products may be cheaper but often compromise quality and reliability. They can lead to malfunction, damage, or even safety hazards. To avoid counterfeits, purchase from authorized Stihl dealers and verify packaging for genuine logos. Cross-reference part numbers with the official Stihl MS 251 parts list PDF to confirm authenticity. Genuine parts guarantee durability and compatibility, protecting your investment and ensuring reliable operation;4.1 Carburetor Overview
4.2 Fuel System Maintenance Tips
Chain Brake System
5.1 Chain Brake Components
5.2 Safety Features and Functionality
How to Use the Parts List PDF
6.1 Navigating the PDF Document
6.2 Locating Specific Parts
Maintenance and Repair Tips
7.1 Regular Maintenance Schedule
7.2 DIY Repair Guidance
Importance of Genuine Stihl Parts
8.1 Benefits of Using Genuine Parts
8.2 Avoiding Counterfeit Products