STIHL HS80 Manual

The STIHL HS80 is a professional-grade hedge trimmer designed for demanding trimming tasks. It features a powerful engine, lightweight design, double-sided cutting blades, anti-vibration system, easy-start technology, ergonomic handles, and safety features like a throttle trigger lockout. Below are key sections for safety, features, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Powerful 2-stroke engine, Double-sided cutting blade, Anti-vibration system, Ergonomic front and rear handles, Quick-stop inertia chain brake, Easy-start system, Throttle trigger lockout.

Feature	Description
Engine	High-performance 2-stroke engine for reliable power
Cutting Blade	Double-sided, hardened steel blade for efficient trimming
Anti-Vibration System	Reduces operator fatigue during extended use
Easy-Start System	Simplifies starting with reduced pulling force
Throttle Trigger Lockout	Prevents accidental throttle engagement
Quick-stop Inertia Chain Brake	Stops cutting blade rapidly in case of kickback
Ergonomic Handles	Comfortable front and rear handles for better control
Fuel Tank	Integrated tank for fuel/oil mixture
Blade Length	Optimized length for precision trimming
Weight	Lightweight design for easy maneuverability

Safety Instructions

Read all instructions before operation. Wear appropriate safety gear.

1. Personal Protective Equipment: Always wear safety glasses, hearing protection, gloves, and sturdy footwear.
2. Clear Work Area: Ensure area is free of bystanders, pets, and obstacles before starting.
3. Inspect Tool: Check for damage, loose parts, and proper blade condition before each use.
4. Proper Handling: Hold trimmer firmly with both hands; maintain secure footing.
5. Fuel Safety: Refuel in well-ventilated area with engine off and cool. No smoking.

WARNING! Risk of serious injury or death. Do not operate without proper training and safety gear. Keep hands and feet away from cutting blade at all times.

Assembly & Preparation

Unpack and inspect all components. Assemble according to instructions.

1. Attach Handle: Secure front and rear handles using provided bolts and tools.
2. Install Blade Guard: Place blade guard over cutting blade for transport and storage.
3. Fuel Mix: Prepare correct fuel/oil mixture (50:1 ratio with STIHL 2-stroke oil).
4. Fill Fuel Tank: Add mixture to fuel tank, avoiding overfill.
5. Check Controls: Ensure throttle trigger, lockout, and stop switch function properly.

CAUTION! Use only STIHL-approved parts and accessories. Incorrect assembly can lead to malfunction or injury.

Specifications

• Model: STIHL HS80
• Engine Type: 2-stroke, single-cylinder
• Displacement: [Specify cc]
• Power Output: [Specify kW/HP]
• Fuel/Oil Ratio: 50:1 (STIHL 2-stroke oil)
• Fuel Tank Capacity: [Specify liters]
• Cutting Blade Length: [Specify cm/inches]
• Tooth Spacing: [Specify mm]
• Weight (without fuel): [Specify kg/lbs]
• Sound Power Level: [Specify dB(A)]
• Vibration Levels: Front/Rear handle [Specify m/s²]

Controls and Components

Main Controls: Throttle trigger, Throttle trigger lockout, Stop switch, Choke lever, Primer bulb, Decompression valve (if equipped).

Components: Engine, Cutting blade, Anti-vibration mounts, Fuel tank, Air filter, Spark plug, Muffler, Handle assembly.

Operation: Start with choke, then switch to run position. Use throttle trigger for blade speed control. Engage lockout to prevent accidental throttle activation. Use stop switch to shut off engine.

Operation

Starting, trimming techniques, and shutdown procedure.

1. Starting Cold Engine: Set choke, press primer bulb, pull starter cord until engine fires, move choke to run, pull again to start.
2. Starting Warm Engine: Choke off, pull starter cord.
3. Trimming Technique: Hold trimmer at slight angle; use smooth sweeping motions. Avoid forcing blade.
4. Shutdown: Release throttle, allow engine to idle briefly, press stop switch.

Tip: Allow engine to warm up for 1-2 minutes before full throttle operation.

Fuel & Lubrication

Use fresh, unleaded gasoline (min. 89 octane) mixed with STIHL 2-stroke oil at 50:1 ratio.

1. Mixing: Add oil to fuel can first, then gasoline. Shake well.
2. Refueling: Stop engine and allow to cool. Clean area around fuel cap. Fill to specified level.
3. Blade Lubrication: Apply STIHL cutting blade lubricant regularly to reduce wear and improve cutting.

WARNING! Never use straight gasoline or automotive oil. Improper fuel can cause engine damage and void warranty.

Maintenance

Regular maintenance ensures optimal performance and longevity.

Maintenance Task	Frequency	Procedure
Air Filter Cleaning	Every 10 hours	Remove, clean with soapy water, dry, reinstall.
Spark Plug Check	Every 20 hours	Inspect electrode gap; clean or replace as needed.
Blade Inspection	Before each use	Check for damage, dullness, or loose teeth.
Fuel Filter Replacement	Every season	Replace if clogged or annually.
Anti-Vibration Mounts	Annually	Inspect for wear; replace if cracked or deteriorated.

CAUTION! Disconnect spark plug before performing any maintenance. Use only STIHL genuine parts.

Storage

Prepare trimmer for extended storage to prevent fuel system issues.

1. Short-term (under 30 days): Store in dry place with fuel tank full.
2. Long-term (over 30 days): Drain fuel tank and run engine until it stops to clear carburetor. Remove spark plug, add few drops of oil, pull starter cord slowly, reinstall plug.
3. Clean thoroughly, apply blade lubricant, store in dry, secure location.

CAUTION! Storing with old fuel can cause carburetor damage and starting problems.

Regulatory Information

Complies with applicable safety and emission standards. This product contains chemicals known to cause cancer and reproductive harm. For more information, see www.P65Warnings.ca.gov. STIHL is a registered trademark. For support, visit www.stihlusa.com or contact 1-800-467-8445.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Old fuel, clogged filter, spark plug	Use fresh fuel mix; clean/replace air filter; check spark plug.
Engine runs poorly	Dirty carburetor, fuel line	Clean carburetor; inspect fuel line for cracks.
Excessive vibration	Loose parts, worn mounts	Tighten all bolts; replace anti-vibration mounts.
Blade doesn't move	Drive mechanism, clutch	Check drive shaft and clutch assembly for damage.
Poor cutting performance	Dull blade, lubrication	Sharpen or replace blade; apply blade lubricant.

Service: For repairs, contact authorized STIHL servicing dealer. Do not attempt major repairs yourself.

Support: 1-800-467-8445; www.stihlusa.com