stihl fs55r manual

Stihl FS55R Manual: A Comprehensive Guide

This manual expertly guides users through the Stihl FS55R, offering detailed instructions for operation, maintenance, and repair, ensuring optimal performance.

The Stihl FS55R is a versatile and powerful gasoline-powered string trimmer, designed for homeowners tackling various landscaping tasks. This manual serves as a comprehensive resource, providing essential information for safe and efficient operation. It details everything from initial assembly and fueling procedures to detailed maintenance schedules and troubleshooting guides. Understanding this manual ensures you maximize the FS55R’s performance and longevity, while prioritizing your safety. Proper use, as outlined herein, will deliver professional-quality trimming results for years to come.

Safety Precautions

Prioritize safety when operating the Stihl FS55R. Always read and understand this manual before use. Be aware of potential hazards like thrown objects and rotating cutting heads. Never operate the trimmer without proper Personal Protective Equipment (PPE), including eye and hearing protection, sturdy footwear, and long sleeves. Maintain a safe operating distance from bystanders. Inspect the equipment before each use, ensuring all parts are secure and in good working condition.

Personal Protective Equipment (PPE)

Essential PPE is crucial for safe operation. Always wear safety glasses or a face shield to protect your eyes from flying debris. Hearing protection, such as earmuffs or earplugs, is vital due to the engine’s noise. Sturdy, non-slip footwear provides foot protection. Long sleeves and long pants shield your skin. Gloves enhance grip and protect hands. Never operate the FS55R without the recommended PPE.

General Safety Warnings

Read the entire manual before operating the Stihl FS55R. Be aware of surroundings and potential hazards. Keep bystanders, especially children and pets, at a safe distance. Never operate the trimmer while fatigued or under the influence of drugs or alcohol. Inspect the equipment before each use for damage. Always disconnect the spark plug before performing maintenance.

Understanding the Components

The Stihl FS55R consists of a powerful engine, a robust cutting head accepting various attachments, and ergonomically designed handles with intuitive controls. Familiarize yourself with the engine’s key parts, the different cutting head options (string, blade), and the throttle, on/off switch, and anti-vibration system. Proper component knowledge ensures safe and efficient operation.

Engine Overview

The Stihl FS55R is powered by a 27.2cc, 2-stroke engine delivering reliable performance for trimming and brush clearing. Key engine components include the cylinder, piston, crankshaft, and carburetor. Understanding these parts aids in troubleshooting and maintenance. Regular inspection and proper fuel mixture are crucial for optimal engine longevity and efficient operation, ensuring consistent power output.

Cutting Head & Attachments

The FS55R utilizes a robust cutting head compatible with various attachments like nylon line, grass blades, and even a clearing saw blade. The automatic feeder head efficiently advances the cutting line. Proper attachment selection depends on the task at hand – line for grass, blades for thicker weeds, and a saw blade for brush. Always ensure secure attachment before operation.

Handle and Controls

The FS55R features ergonomically designed handles for comfortable operation and precise control. Key controls include the throttle trigger, on/off switch, and choke lever, all intuitively positioned for easy access. The throttle interlock prevents accidental activation. Familiarize yourself with each control’s function before use, ensuring safe and efficient trimming. Adjust the handles for optimal comfort and balance.

Assembly Instructions

Before first use, careful assembly is crucial for safe operation. Begin by securely attaching the handle to the engine unit, ensuring proper alignment and tightening all bolts firmly. Next, mount the cutting head, verifying it clicks into place with a positive lock. Double-check all connections before fueling or starting the engine; Refer to the diagrams for correct component placement.

Attaching the Handle

Securely fasten the handle to the engine using the provided bolts. Ensure proper alignment of the handle components before tightening. Tighten all bolts firmly, but avoid over-tightening, which could damage the plastic. The handle provides crucial control during operation, so a secure attachment is paramount for user safety and comfortable trimming. Verify stability before proceeding.

Mounting the Cutting Head

Align the cutting head with the drive shaft, ensuring the retaining clip engages correctly. Rotate the head until it clicks into place, verifying a secure connection. Incorrect mounting can lead to the head detaching during use, posing a safety hazard. Double-check the locking mechanism before each operation. Proper installation ensures efficient and safe trimming performance.

Fueling and Mixing

Always use a fresh fuel mix specifically formulated for two-stroke engines. The Stihl FS55R requires a precise gasoline-to-oil ratio for optimal performance and longevity. Incorrect mixtures can cause engine damage. Use only high-quality two-stroke oil. Thoroughly mix the fuel and oil in a clean container before adding it to the fuel tank, ensuring proper lubrication and preventing engine seizure.

Recommended Fuel Mix Ratio

Stihl recommends a 50:1 fuel-to-oil ratio for the FS55R trimmer. This translates to 50 parts gasoline to 1 part high-quality two-stroke engine oil. Always verify this ratio in your specific model’s documentation, as variations may exist. Using the correct ratio is crucial for engine lubrication, preventing premature wear, and ensuring reliable operation. Deviations can void your warranty.

Fueling Procedure

Before fueling, ensure the engine is cool and the trimmer is on a stable, flat surface. Carefully remove the fuel cap, and using a funnel, slowly pour the pre-mixed fuel into the tank, avoiding spillage. Do not overfill – leave some space for expansion. Securely tighten the fuel cap after fueling. Wipe away any spilled fuel immediately before starting the engine.

Starting the Engine

Prior to starting, verify the cutting head is clear of obstructions and the trimmer is safely positioned. Engage the choke for a cold start, then prime the fuel bulb several times. Firmly grasp the starter handle and pull briskly until the engine attempts to start. Disengage the choke once running, and pull again to fully start.

Cold Start Procedure

For a cold engine, position the choke lever to the ‘start’ position. Prime the fuel bulb approximately six to ten times until fuel is visible. Ensure the trimmer is on a stable surface, then firmly grasp the starter handle. Pull the cord with a quick, decisive motion until the engine fires.

Warm Start Procedure

When restarting a warm engine, the choke lever should generally remain in the ‘run’ position. Gently pull the starter cord; typically, fewer pulls are needed compared to a cold start. Avoid excessive choking, as this can flood the engine. If it doesn’t start, briefly engage the choke and try again.

Operating Instructions

Before each use, inspect the cutting head for damage and ensure proper attachment. Maintain a firm grip on the handles, keeping a safe distance from the cutting area. Utilize smooth, controlled movements while trimming, avoiding obstacles. Regularly check the fuel level and adjust cutting height as needed for optimal results and safety;

Proper Trimming Techniques

Employ sweeping motions, moving the FS55R from side to side, to achieve a clean and even cut. Avoid forcing the trimmer; let the cutting head do the work. Maintain a slight angle when trimming along edges and around obstacles. Regularly clear away cut vegetation to prevent clogging and ensure efficient operation, prioritizing safety.

Adjusting Cutting Height

The FS55R’s cutting height is primarily adjusted by the user’s stance and the angle of the trimmer head. For a lower cut, tilt the head slightly and reduce your stance height. Conversely, raise your stance and angle the head upwards for a higher cut. Practice these adjustments to achieve desired results, ensuring consistent trimming.

Maintenance Schedule

Regular maintenance is crucial for the FS55R’s longevity and performance. After each use, inspect for damage and clean debris. Every 25 operating hours, clean the air filter and check the spark plug. Every 50 hours, replace the spark plug and inspect the fuel lines. Annually, a thorough inspection of all components is recommended, ensuring optimal functionality and safety.

Air Filter Cleaning

Maintaining a clean air filter is vital for engine performance. Remove the filter cover and carefully take out the filter element. Gently tap it to remove loose debris, or use compressed air – blowing from the inside out. If heavily soiled, wash in warm, soapy water, rinse thoroughly, and allow to dry completely before reinstalling. A clogged filter restricts airflow, reducing power.

Spark Plug Replacement

Regular spark plug replacement ensures reliable starting and efficient combustion. Disconnect the spark plug wire and use a spark plug wrench to remove the old plug. Check the gap on the new plug using a feeler gauge, adjusting if necessary. Carefully thread in the new plug, tightening to the specified torque. Reconnect the wire securely. A faulty plug causes starting issues.

Troubleshooting Common Issues

Addressing problems promptly extends the life of your Stihl FS55R. If the engine won’t start, check fuel levels, spark plug connection, and air filter cleanliness. Cutting head issues often stem from tangled line or a worn-out head. Inspect and replace line as needed. Ensure proper assembly. Regular maintenance prevents many common failures, saving time and frustration.

Engine Won’t Start

A non-starting engine requires systematic diagnosis. First, verify fresh fuel with the correct mix ratio. Check the spark plug for fouling or damage, cleaning or replacing it as necessary. Ensure the choke is engaged during a cold start. Inspect the air filter for obstructions. A flooded engine may need airing out before restarting attempts.

Cutting Head Problems

Issues with the cutting head often stem from tangled line or a worn-out head. Ensure proper line loading technique, avoiding overfilling. Inspect the bump feed mechanism for functionality and debris. Check for damaged or missing line guides. A seized head requires disassembly and cleaning. Regularly inspect and replace worn parts to maintain optimal cutting performance.

Technical Specifications

The Stihl FS55R boasts a 27.2 cc engine displacement, delivering reliable power for trimming tasks. Its output is approximately 1.2 kW (1.6 hp). The unit weighs around 5.5 kg (12.1 lbs) without the cutting attachment. Overall dimensions are compact, enhancing maneuverability. Fuel capacity is 0.325 liters, providing extended runtime. These specifications ensure a balanced and efficient tool.

Engine Displacement & Power

The Stihl FS55R is equipped with a robust 27.2 cubic centimeter (cc) engine, providing ample power for various trimming applications. This engine delivers an output of approximately 1.2 kilowatts (kW), equivalent to 1.6 horsepower (hp). This combination ensures sufficient torque and speed for efficient cutting.

Weight and Dimensions

The Stihl FS55R is designed for user comfort and maneuverability, weighing in at approximately 11.0 pounds (5.0 kg) without the cutting attachment. Its overall length is around 66.9 inches (1700 mm) with a straight shaft. These dimensions contribute to balanced handling and reduced fatigue during extended use, making it ideal for various landscaping tasks.

Storage and Transportation

For long-term storage, thoroughly clean the Stihl FS55R and drain the fuel tank to prevent carburetor issues. Store in a dry, secure location away from direct sunlight and extreme temperatures. When transporting, ensure the cutting head is protected with a scabbard. Secure the trimmer properly to prevent damage or injury during transit, following all local regulations.

Long-Term Storage

Preparing your Stihl FS55R for extended storage requires careful attention. Completely drain the fuel tank and run the engine until it stalls to empty the carburetor. Clean the air filter and exterior surfaces thoroughly; Store the unit in a dry, dust-free environment, protected from freezing temperatures and direct sunlight. Consider applying a corrosion inhibitor to metal parts for added protection.

Safe Transportation Guidelines

When transporting your Stihl FS55R, always ensure the engine is cool and the fuel tank is empty or securely sealed. Engage the chain brake or remove the cutting head for added safety. Utilize a protective sheath over the cutting attachment. Secure the unit properly in a vehicle to prevent shifting during transit, avoiding damage and potential hazards.

Disassembly and Repair (Basic)

Basic repairs on your Stihl FS55R should only be attempted by those comfortable with small engine mechanics. Always disconnect the spark plug wire before any disassembly. Carefully remove components, noting their positions for reassembly. Inspect parts for wear or damage, replacing as needed. Refer to the parts diagram for guidance, and prioritize safety throughout the process.

Removing the Spark Plug

Before any maintenance or repair, disconnecting the spark plug is crucial for safety. Locate the spark plug, typically covered by a protective cap. Use a spark plug wrench of the correct size to carefully loosen and remove it. Inspect the spark plug for fouling or damage; replace if necessary. Proper gap setting is vital for optimal engine performance upon reinstallation.

Inspecting the Carburetor

A properly functioning carburetor is essential for smooth engine operation. Visually inspect the carburetor for any signs of damage, leaks, or obstructions. Check the fuel lines and connections for tightness and deterioration. Look for debris within the carburetor body that could restrict fuel flow. Careful examination aids in diagnosing fuel delivery issues and ensures efficient combustion.

Understanding the Carburetor

The carburetor mixes air and fuel to create the combustion mixture powering the Stihl FS55R. It features adjustable settings for idle speed and mixture control. Understanding its components – jets, diaphragm, and throttle valve – is crucial for proper tuning. A clean and correctly adjusted carburetor ensures efficient operation, optimal power, and reduced emissions, contributing to the longevity of your tool.

Carburetor Adjustment

Proper carburetor adjustment is vital for optimal engine performance. Begin by ensuring the air filter is clean. Adjust the idle speed screw for a smooth, stable idle. Then, carefully adjust the mixture control screw – typically clockwise to lean, counterclockwise to enrich – until the engine runs smoothly at various speeds. Avoid overly lean mixtures, which can cause overheating.

Cleaning the Carburetor

A clogged carburetor can cause starting issues and poor performance. Begin by disconnecting the fuel line and carefully disassembling the carburetor. Use carburetor cleaner to thoroughly flush all passages and jets, ensuring no residue remains. Inspect the diaphragm for cracks or damage, replacing if necessary. Reassemble carefully, using new gaskets if available, and ensure proper fuel line connection.

Parts Diagram and Ordering

Locating detailed parts diagrams is crucial for identifying the correct replacement components for your Stihl FS55R. These diagrams, often available online through Stihl’s official website or authorized dealers, illustrate exploded views of the trimmer’s assembly. When ordering parts, always have the model and serial number handy. Authorized Stihl dealers provide genuine parts and expert assistance, ensuring compatibility and quality.

Locating Parts Diagrams

Finding the correct parts diagrams for your Stihl FS55R is essential for repairs. Stihl’s official website offers downloadable PDF manuals, including comprehensive parts lists with exploded views. Authorized Stihl dealers can also provide these diagrams, often assisting with identification. Alternatively, some online parts retailers feature interactive diagrams. Always verify the diagram matches your specific FS55R model and serial number for accuracy.

Ordering Replacement Parts

To order replacement parts for your Stihl FS55R, utilize authorized Stihl dealers for genuine components. Provide the part number, obtained from the parts diagram, to ensure correct ordering. Online Stihl retailers also offer parts, but verify authenticity. Always confirm compatibility with your FS55R’s model and serial number. Keep records of purchases for warranty purposes and future reference.

Warranty Information

Stihl FS55R units are covered by a limited warranty against defects in materials and workmanship. The warranty period typically begins on the date of purchase. Coverage may vary based on usage – commercial versus private. Keep your original purchase receipt as proof of date. Warranty claims require inspection by an authorized Stihl dealer. Modifications void the warranty.

Contact Information for Stihl Support

For assistance with your Stihl FS55R, visit the official Stihl website for a dealer locator and comprehensive support resources. You can find FAQs, parts diagrams, and downloadable manuals online. Direct customer support is available via phone during business hours. Authorized Stihl servicing dealers offer expert repair and maintenance services. Contact information varies by region; check the Stihl website for local details.