Stihl Grass Trimmer Manual

The Stihl Grass Trimmer is a professional-grade, gasoline-powered string trimmer designed for efficient lawn and garden maintenance. It features a high-performance 2-stroke engine, adjustable cutting head, ergonomic handles with anti-vibration system, easy-start technology, automatic line advance, and a lightweight yet durable construction. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly & Installation 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Fuel & Lubrication 7. Cutting Techniques 8. Maintenance Schedule 9. Storage Guidelines 10. Safety Information 11. Troubleshooting

Features at a Glance

Key components: 2-stroke engine, cutting head with automatic line feed, shaft, handle assembly, throttle trigger, stop switch, and fuel tank.

Feature	Description
Engine Type	2-stroke, air-cooled gasoline engine
Cutting Width	Adjustable up to 17 inches
Fuel Tank Capacity	Approximately 14.9 fl oz (0.44 liters)
Drive System	Flexible shaft drive
Starting System	Easy-start technology with decompression valve
Anti-Vibration System	Integrated into handle and shaft
Cutting Head	Automatic line advance (Tap-N-Go)
Handle	Ergonomic loop handle with controls
Weight	Approximately 10.8 lbs (4.9 kg) without fuel
Warranty	Limited warranty as per regional regulations

Assembly & Installation

Unpack all parts and inspect for damage. Assemble on a clean, flat surface.

Attach the handle: Align handle with shaft and secure with provided bolts.
Install cutting head: Thread the cutting head onto the drive shaft and tighten securely.
Attach shoulder strap: Connect strap to designated anchor points on the trimmer.
Fill with fuel mixture: Use proper gasoline/oil mix (see specifications).

WARNING! Always wear protective gloves during assembly. Ensure all fasteners are tightened securely before operation.

First-Time Operation

Before starting, read all safety instructions and ensure proper personal protective equipment is worn.

Check fuel level: Ensure proper gasoline/oil mixture is in tank.
Primer bulb: Press primer bulb 5-10 times until fuel is visible.
Choke setting: Set choke to cold start position.
Starting procedure: Place on ground, hold securely, pull starter cord briskly.
Warm-up: Allow engine to run at idle for 1-2 minutes before use.

CAUTION! Never operate in enclosed areas. Keep bystanders and pets at a safe distance.

Specifications

Engine Displacement: 27.2 cc
Power Output: 1.0 HP
Fuel/Oil Ratio: 50:1 (Stihl HP Ultra oil recommended)
Idle Speed: 2,800 RPM
Maximum Speed: 10,000 RPM
Cutting Line Diameter: 0.095 inches (2.4 mm)
Sound Power Level: 100 dB(A)
Vibration Level: Left handle: 4.2 m/s², Right handle: 6.5 m/s²
Emissions Compliance: EPA Phase III, CARB Tier III

Controls and Settings

Main controls located on handle assembly: Throttle trigger, throttle trigger lockout, stop switch, choke lever.

Adjustments: Handle height adjustment, shoulder strap length, cutting head angle.

Operation: Squeeze throttle trigger lockout and throttle trigger simultaneously to increase engine speed. Release to return to idle. Use stop switch to immediately stop engine.

Fuel & Lubrication

Use fresh unleaded gasoline with minimum 89 octane rating mixed with Stihl HP Ultra oil at 50:1 ratio.

Mix fuel in approved container before adding to trimmer.
Never use straight gasoline or motor oil.
Do not mix fuel in trimmer's fuel tank.
Clean fuel cap area before opening to prevent contamination.

Tip: Use fuel stabilizer if storing for more than 30 days. Always store fuel in approved containers away from heat sources.

Cutting Techniques

Proper technique ensures efficient cutting and extends equipment life.

Hold trimmer at comfortable height with cutting head parallel to ground.
Use sweeping motion from side to side, advancing slowly.
Cut with tip of line for best efficiency and line life.
For edging, tilt trimmer so cutting head is vertical.
Avoid cutting against hard surfaces like walls, rocks, or fences.
For thick vegetation, use multiple passes rather than forcing through.

WARNING! Always maintain secure footing and balance. Never operate above shoulder height.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Interval	Maintenance Task
Before each use	Check for loose fasteners, inspect cutting head, check fuel level
Every 25 hours	Clean air filter, check spark plug, inspect fuel filter
Every 50 hours	Replace air filter, clean cooling fins, check drive shaft
Every 100 hours	Replace spark plug, clean carburetor, check anti-vibration elements
Annually	Complete inspection by authorized Stihl dealer

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

Drain fuel tank or add fuel stabilizer for long-term storage.
Run engine until it stops to clear carburetor of fuel.
Clean entire trimmer, removing grass and debris.
Store in dry, well-ventilated area away from heat sources.
Remove cutting line from head or loosen tension for storage.

CAUTION! Never store with fuel in tank for more than 30 days without stabilizer. Keep out of reach of children.

Safety Information

Always wear: Eye protection, hearing protection, long pants, sturdy shoes, gloves. Never wear loose clothing or jewelry.

Operating precautions: Keep bystanders at least 50 feet away. Be aware of thrown objects. Never operate when tired or under influence. Watch for hidden obstacles like wires, rocks, or glass.

Emergency procedures: Release throttle trigger immediately if loss of control occurs. Use stop switch for emergency shutdown.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, flooded engine, spark plug	Check fuel level; wait if flooded; check/replace spark plug.
Engine runs poorly	Dirty air filter, old fuel	Clean/replace air filter; use fresh fuel mixture.
Line not advancing	Empty spool, tangled line	Refill spool with proper line; untangle or replace spool.
Excessive vibration	Loose parts, bent shaft	Tighten all fasteners; inspect shaft for damage.
Overheating	Dirty cooling fins, lean mixture	Clean cooling fins; check carburetor adjustment.

Service: For complex repairs, contact authorized Stihl dealer. Use only genuine Stihl replacement parts.

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