Stihl HS 81 Instruction Manual

Pages 76

Year 2011

Language(s)

of 76

Stihl HS 81 Specification

The Stihl HS 81 is a professional-grade hedge trimmer designed to offer efficiency, power, and precision for both commercial and residential landscaping applications. It features a robust 2-stroke engine with a displacement of approximately 22.7 cc, delivering consistent power for demanding trimming tasks. The engine is engineered for fuel efficiency and reduced emissions, aligning with modern environmental standards.

This hedge trimmer is equipped with dual-action, double-sided blades that come in varying lengths, typically 24 inches and 30 inches, allowing for versatile cutting capabilities and increased reach. The blades are laser-cut and diamond-ground, ensuring sharpness and durability for clean and precise cutting results. The HS 81 incorporates an advanced anti-vibration system, which significantly reduces operator fatigue by minimizing engine and blade vibrations during use.

For user comfort and maneuverability, the trimmer features an ergonomic design with a multi-function handle that is adjustable, providing flexibility and ease of use in different trimming positions. The lightweight construction, typically around 11 pounds, further enhances handling and control.

Safety is prioritized with an easy-to-access throttle lock and a front hand guard, which help prevent accidental starts and protect the user from debris. Maintenance is streamlined with accessible components, and the inclusion of a purge pump primer facilitates easier starting. The Stihl HS 81 is designed for professionals seeking reliability and performance in hedge maintenance, offering a balance of power, precision, and user-friendly features.

Stihl HS 81 F.A.Q.

How do I start the Stihl HS 81 hedge trimmer?

To start the Stihl HS 81, ensure the unit is on a flat surface. Set the choke lever to the "Start" position, press the primer bulb several times until fuel is visible, and pull the starter rope sharply until the engine fires. Move the choke to the "Run" position and pull the starter rope again until the engine runs smoothly.

What fuel mix is recommended for the Stihl HS 81?

The recommended fuel mix for the Stihl HS 81 is a 50:1 ratio of gasoline to Stihl 2-cycle engine oil. Use fresh, high-quality gasoline with a minimum octane rating of 89.

How can I sharpen the blades of my Stihl HS 81?

To sharpen the blades, first ensure the trimmer is powered off and the spark plug is disconnected. Use a flat file or a sharpening stone to hone each cutting edge, maintaining the original angle of the blade. Clean the blades with a solvent and lubricate them after sharpening.

What should I do if the Stihl HS 81 engine won't start?

If the engine won't start, check the fuel mixture and ensure it's fresh. Inspect the spark plug for wear or damage and replace if necessary. Ensure the air filter is clean and not clogged. If these steps don't resolve the issue, consult a professional technician.

How often should I perform maintenance on my Stihl HS 81?

Routine maintenance should be performed after every 25 hours of use, including checking the air filter, spark plug, and fuel system. Additionally, inspect the blades for sharpness and clean them regularly. Refer to the owner's manual for detailed maintenance schedules.

How do I clean the air filter on my Stihl HS 81?

To clean the air filter, remove the filter cover, take out the air filter, and wash it with warm, soapy water. Rinse thoroughly and allow it to dry completely before reinstalling. Replace the filter if it's damaged or excessively dirty.

What is the proper way to store my Stihl HS 81 during the off-season?

For off-season storage, drain the fuel tank and run the engine until it stops to clear any fuel from the carburetor. Clean the unit thoroughly, inspect for any damage, and store in a dry, dust-free environment. Consider applying a light coat of oil to the blades to prevent corrosion.

Why is my Stihl HS 81 vibrating excessively during operation?

Excessive vibration can be caused by unbalanced blades or loose components. Inspect the blades for damage or wear and ensure they are properly aligned. Tighten any loose screws or bolts. If the issue persists, consult a professional technician.

How do I replace the spark plug on my Stihl HS 81?

To replace the spark plug, first ensure the engine is cool and the ignition is off. Remove the spark plug boot and use a spark plug wrench to unscrew the old plug. Install the new spark plug by hand to avoid cross-threading, then tighten with the wrench. Reattach the spark plug boot.

What safety precautions should I take when using the Stihl HS 81?

Always wear appropriate personal protective equipment, including gloves, eye protection, and hearing protection. Ensure the work area is clear of obstacles and bystanders. Follow the manufacturer's guidelines for operation and maintenance to ensure safe use.