The Echo SRM-225 is a powerful 21.2cc grass trimmer/brush cutter designed for durability and reliability. It features a nylon line head, automatic line advancement, and robust safety features for efficient cutting.

Safety Precautions
Read the operator and safety manuals carefully for proper and safe operation. Safety symbols and key words highlight critical warnings to prevent serious injury or damage.
Wear protective gear, including gloves and hearing protection. Handle fuel with extreme care, as it is highly flammable. Avoid repetitive stress injuries by using proper techniques and taking breaks.
Safety Symbols and Key Words
Throughout the Echo SRM-225 manual and on the product itself, safety alerts and informational messages are preceded by specific symbols or key words. These symbols and words are crucial for understanding potential hazards and ensuring safe operation.
Key words like “DANGER,” “WARNING,” and “CAUTION” indicate varying levels of risk. “DANGER” signifies an immediate hazard that could result in serious injury or death, while “WARNING” highlights potential harm. “CAUTION” alerts users to less severe risks or damage to the equipment.
Symbols, such as a fire icon for flammable materials or a hand symbol for protective gloves, provide quick visual warnings. These symbols and key words are explained in detail in the manual, ensuring users understand their meanings and implications.
By paying attention to these symbols and key words, users can operate the SRM-225 safely and avoid potential risks. Consistent use of these alerts ensures clear communication of safety information throughout the manual and on the product. Always review and understand these warnings before use.
Personal Protective Equipment
Wearing proper personal protective equipment (PPE) is essential when operating the Echo SRM-225 to minimize risks and ensure safe operation. Always wear heavy-duty, no-slip work gloves to improve grip and reduce vibration transmission to hands.
Echo recommends using hearing protection, as prolonged exposure to engine noise can cause hearing damage. Additionally, wear snug-fitting, durable clothing to avoid entanglement with moving parts.

Protective eyewear is also advised to guard against debris. Steel-toe boots or sturdy footwear can prevent foot injuries from accidental blade contact. Proper PPE not only enhances safety but also contributes to better control and comfort during operation.
By adhering to these guidelines, users can significantly reduce the risk of injury and ensure a safer trimming experience. Always prioritize PPE to protect yourself while operating the SRM-225.
Fuel Handling
Proper fuel handling is critical for safe and efficient operation of the Echo SRM-225. Use only approved 2-stroke gasoline with no more than 10% ethanol or 15% MTBE. Avoid E-15, E-85, or other alternative fuels, as they may cause engine damage or performance issues.
Fuel is highly flammable, so handle it with extreme care. Use an approved fuel container and avoid smoking or exposing fuel to open flames or sparks. Store fuel in a well-ventilated area, away from heat sources and flammable materials.
When mixing or handling fuel, ensure the area is clear of ignition sources. Always follow the manufacturer’s guidelines for fuel storage and disposal. Proper fuel handling prevents accidents and ensures optimal performance of your Echo SRM-225.
Repetitive Stress Injuries
Repetitive stress injuries (RSI) can occur from overusing the muscles and tendons in the fingers, hands, arms, and shoulders while operating the Echo SRM-225. Symptoms may include soreness, swelling, numbness, weakness, or extreme pain in these areas. Certain repetitive hand activities, such as gripping or vibrating tools, increase the risk of developing RSI.
- Take regular breaks to rest your hands and arms.
- Use proper grip techniques to reduce strain.
- Wear gloves to absorb vibration and improve control.
- Adjust your working posture to minimize strain on your shoulders and arms.

Early recognition of symptoms is crucial to prevent long-term damage. If discomfort persists, consult a healthcare professional for proper evaluation and treatment.
Equipment Use
Use only ECHO-approved attachments to ensure safety and performance. Always wear proper clothing and follow safety guidelines. Regularly inspect safety decals and replace them if damaged or illegible.
Approved Attachments
Only ECHO-approved attachments should be used with the SRM-225 to ensure safe and proper operation. Using non-approved attachments can lead to serious injury or equipment damage. ECHO-approved attachments are specifically designed and tested for compatibility and performance. Examples include nylon line heads, metal blades, and cutting shields. Always refer to the manual or consult an authorized ECHO dealer for a list of approved attachments. Using unauthorized attachments may void the warranty and compromise safety features. Proper installation and maintenance of approved attachments are crucial for optimal performance and longevity of the trimmer. Never modify or alter attachments, as this can lead to malfunctions or hazards. Always follow the manufacturer’s guidelines for attachment usage and maintenance to ensure reliable operation and safety.
Safety Decals
Safety decals on the Echo SRM-225 provide critical information for safe operation. These decals are strategically placed to remind users of key safety precautions and operational guidelines. Ensure all decals are legible and intact. If a decal is damaged or worn, replace it immediately by ordering from an authorized ECHO dealer. Decals cover warnings about hot mufflers, proper handling, and protective equipment. Familiarize yourself with each decal’s message to avoid potential hazards. Ignoring safety decals can lead to serious injury or equipment damage. Regularly inspect decals during maintenance checks to ensure clarity and adherence. Proper understanding and adherence to decal instructions are essential for safe and effective use of the trimmer. Always follow the guidance provided on safety decals to maintain a safe operating environment.

Product Description
The Echo SRM-225 is a 21.2cc, air-cooled, two-stroke gasoline engine trimmer/brush cutter. It features a nylon line head, front handle, and is designed for durability and efficient cutting performance.
Nylon Line Head Installation
Installing the nylon line head on the Echo SRM-225 is straightforward but requires attention to detail. Ensure the plastic debris shield with a cut-off knife is in place, as metal shields can damage the trimmer. Remove the spool by turning it counterclockwise until it clicks. Align the arrows on the spool with the marks on the drum and insert the nylon line ends into the holes. Wind the line clockwise, ensuring it does not overlap. Secure the spool and tighten firmly. After installation, tap the head on the ground to advance the line to the correct length. Avoid over-tightening or using excessive force, as this may damage the mechanism. Proper installation ensures efficient cutting performance and prevents engine overheating due to excessive line length.
Front Handle Installation
Installing the front handle on the Echo SRM-225 requires a Torx T27 L-Wrench and is essential for comfortable operation. Position the handle at a height that allows easy control, ensuring it aligns with the label’s minimum spacing guidelines. Secure the handle using the provided screws, tightening firmly to prevent loosening during use. Ensure the handle is stable and evenly spaced for balanced operation. After installation, test the handle’s stability by gently tugging to confirm it is properly secured. Proper installation enhances maneuverability and reduces operator fatigue. Always follow the manufacturer’s instructions to avoid improper assembly, which could lead to safety hazards or equipment damage.
Operating the Trimmer
Operate the Echo SRM-225 with the choke and throttle for cold starts, and use the harness for reduced fatigue. Always maintain a firm grip and proper stance for control.
Starting the Cold Engine
To start the cold engine on the Echo SRM-225, ensure the trimmer is on a flat surface and the cutting attachment is clear of obstructions. Move the stop switch to the “START” position. Prime the engine by pressing the primer bulb 2-3 times until fuel flows into the bulb. Set the choke to the “FULL” position and pull the starter rope firmly until the engine starts. Once the engine runs, gradually move the choke to the “RUN” position for smooth operation. Always keep the attachment away from the ground during startup to avoid accidental engagement. If the engine does not start, repeat the process, ensuring the primer is used correctly. Never touch the muffler or exhaust area, as they become extremely hot during operation. Proper starting ensures safe and efficient use of the trimmer.
Starting the Warm Engine
To start the warm engine on the Echo SRM-225, ensure the stop switch is in the “START” position. Move the choke to the “RUN” position, as the engine is already warm. Pull the starter rope firmly until the engine restarts. If the engine idles roughly, adjust the carburetor idle speed screw following the instructions in the manual or consult an authorized ECHO dealer. Never touch the muffler or exhaust area, as they remain extremely hot after operation. Keep the cutting attachment away from the ground during startup to prevent accidental engagement. Proper starting ensures smooth operation and prevents potential damage. Always follow safety guidelines to avoid injury or machine malfunction.
Using the Harness
The Shoulder/Waist Harness is essential for comfortable and safe operation of the Echo SRM-225. It distributes the weight of the trimmer, reducing operator fatigue during extended use. For trimming with the nylon line head, the harness allows the trimmer to hang from the shoulder, providing better control and reducing strain. During blade operation, the harness helps maintain stability and reduces fatigue. Always ensure the harness is securely attached to the trimmer and adjusted to fit comfortably. Proper use of the harness enhances productivity and safety, making it a crucial accessory for both trimming and brush cutting tasks. Follow the manual’s instructions for correct harness installation and adjustment to maximize its benefits and ensure safe operation.
Basic Operating Tips
For optimal performance and safety, follow these essential operating tips for the Echo SRM-225. Always maintain a steady pace while trimming or cutting to avoid overwhelming the engine. Keep the cutting head parallel to the ground to ensure even cutting and prevent uneven wear on the nylon line. Use the full swath width of the trimmer head to maximize efficiency. Avoid over-revving the engine, as this can lead to excessive wear and potential damage. Regularly inspect and clear debris from the cutting head to maintain proper function. When using the nylon line head, tap it gently on the ground to advance the line as needed. Never operate the trimmer near flammable materials or in areas with sparks. Always shut off the engine and allow it to cool before storing or transporting the unit. Proper technique and adherence to these tips will ensure safe and effective operation of the SRM-225.

Maintenance
Regular maintenance ensures optimal performance and longevity of the Echo SRM-225. Check and clean the air filter, inspect the spark plug, and lubricate moving parts as recommended. Inspect the exhaust system for damage or blockages and ensure proper carburetor adjustment. Replace worn or damaged components promptly to maintain efficiency and safety. Always refer to the manual for specific maintenance schedules and procedures.
Air Filter
Regular maintenance of the air filter is essential for optimal engine performance. To clean the air filter, remove it and gently brush off dirt using a soft-bristle brush. Inspect for damage or heavy soiling; if damaged, replace it immediately. A dirty or clogged air filter can lead to reduced engine power, increased fuel consumption, and potential overheating. Always reinstall the filter securely to ensure proper airflow. For replacement, use the REPOWER AIR FUEL FILTER KIT, available from authorized ECHO dealers. Cleaning should be done every 5-10 hours of use, or more frequently in dusty conditions. Properly maintaining the air filter ensures your Echo SRM-225 runs efficiently and reliably, preventing costly repairs and extending the engine’s lifespan. Refer to the manual for detailed steps and recommendations on air filter care.

Spark Plug
The spark plug is a critical component of the Echo SRM-225 engine, ensuring proper ignition and performance. For optimal operation, use only the NGK BPM-8Y spark plug (BPMR-8Y in Canada). Using the wrong type can cause severe engine damage. To replace the spark plug, you’ll need a T-Wrench, a feeler gauge, and a soft metal brush. Remove the spark plug and inspect for fouling, worn electrodes, or rounding of the center electrode. Clean the area around the spark plug port before installation. Tighten the spark plug securely, but avoid over-tightening to prevent damage. Regular inspection and replacement of the spark plug are essential for maintaining engine efficiency and preventing issues like misfires or reduced power output. Refer to the manual for specific torque specifications and recommendations for spark plug maintenance. Proper care ensures reliable engine operation and extends the lifespan of your trimmer. Always follow safety guidelines when handling small engine components.
Exhaust System
The exhaust system of the Echo SRM-225 is designed to efficiently manage engine emissions and heat. The muffler and catalytic muffler can become extremely hot during operation, posing a burn hazard. Always maintain a safe distance from these components while the engine is running. To clean the exhaust system, remove the spark plug lead and engine cover, then use a brush to gently clear debris from the cylinder fins and muffler. Avoid using metal scrapers, as they may damage the components. Regular maintenance ensures proper engine performance and prevents overheating. Inspect the exhaust system for any blockages or damage, and replace worn or damaged parts immediately. Proper care of the exhaust system is crucial for both safety and the longevity of your trimmer. Always follow the manufacturer’s guidelines for maintenance and repairs to ensure optimal functionality. Keep the area around the exhaust clear of flammable materials during use and storage.
Lubrication
Regular lubrication is essential for the smooth operation and longevity of the Echo SRM-225. Use POWER BLENDX Lithium Base Grease to lubricate the gear housing. Before applying grease, clean the area thoroughly with a rag to remove dirt and debris. Use a grease gun to apply the recommended lubricant, ensuring the gear housing is properly coated. Check the grease level by removing the plug and filling as needed. Avoid over-lubrication, as it may attract dirt and cause maintenance issues. Lubrication helps reduce friction, prevents wear on moving parts, and ensures optimal performance. Always refer to the manual for specific lubrication points and intervals. Proper lubrication maintenance will extend the life of your trimmer and keep it running efficiently. Regular checks and timely application of grease are crucial for maintaining the equipment’s reliability and performance.

Troubleshooting

Common issues with the Echo SRM-225 include engine failure to start, improper line feeding, and overheating. Check fuel quality, air filter condition, and spark plug functionality. Address issues promptly to ensure optimal performance and prevent further damage.
Common Issues
Common issues with the Echo SRM-225 include engine failure to start, improper nylon line feeding, and overheating. Engine problems may stem from stale fuel, a faulty spark plug, or a clogged air filter. If the engine doesn’t start, check the fuel quality and spark plug condition. For line feeding issues, ensure the correct line size is used and properly installed. Overheating can occur due to blockages in the muffler or excessive use without breaks. Regularly clean the muffler and ensure proper airflow. Additionally, users may experience repetitive stress injuries from prolonged use, so taking breaks and maintaining proper ergonomics is essential. Addressing these issues promptly can prevent further damage and ensure optimal performance of the trimmer.
Storage and Transportation
Store the Echo SRM-225 in a dry, well-ventilated area, away from flammable materials. Clean the unit thoroughly before storage and use a protective cover to prevent dust buildup.
Long-Term Storage
For long-term storage (over 30 days), ensure the Echo SRM-225 is properly prepared to maintain its condition. Clean the unit thoroughly, removing dirt and debris from the exterior and internal components. Drain old fuel to prevent degradation and stale fuel issues. Store the trimmer in a dry, well-ventilated area, away from direct sunlight and flammable materials. Use a protective cover to shield the unit from dust and moisture. Before storage, inspect the trimmer for any damage or wear and address these issues to prevent further deterioration. Always follow the manufacturer’s guidelines for storage to ensure the trimmer remains in optimal condition for future use. Proper storage helps extend the lifespan of the equipment and ensures safety during transportation and handling.

Specifications
The Echo SRM-225 is a high-performance grass trimmer/brush cutter with a 21.2cc air-cooled, two-stroke, single-cylinder gasoline engine. It features a straight shaft design for enhanced reach and maneuverability. The unit measures 70.6 inches in length, 9.88 inches in width, and 12.9 inches in height, weighing approximately 12.1 pounds without the cutter head. The engine boasts a bore of 1.27 inches and operates efficiently with 89 octane or higher gasoline. The trimmer is designed for both residential and light commercial use, offering reliable performance for cutting grass and thick brush. Its specifications ensure durability and ease of operation, making it a versatile tool for landscaping tasks. Always refer to the manual for detailed technical data and operating guidelines to maximize performance and longevity of the equipment.
Warranty Information
Echo warrants the SRM-225 against defects in material and workmanship for a specified period. The warranty requires owners to demonstrate reasonable care, follow preventative maintenance, and adhere to proper fuel, oil, and storage guidelines as outlined in the manual. Any issues must be addressed by an authorized Echo servicing dealer. Owners are responsible for shipping or delivering the unit for warranty repairs. The warranty does not cover damage resulting from misuse, neglect, or failure to follow instructions. Proper registration and maintenance records may be required to validate warranty claims. Always refer to the official Echo warranty statement for detailed terms and conditions, as coverage and procedures may vary depending on the region and purchase date.
