stihl 550 blower manual

The STIHL 550 Blower is a professional-grade handheld leaf blower designed for demanding residential and commercial use. It features a powerful 2-stroke engine, variable speed control, ergonomic design with anti-vibration system, and a robust air filtration system. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: Powerful 2-stroke engine, Ergonomic handle with anti-vibration, Variable speed throttle, Air purge system, Decompression valve, Easy-start system, and Robust air filter.

Feature	Description
Engine Type	2-stroke, single-cylinder, air-cooled
Displacement	Approximately 28.4 cc
Power Output	High-performance for demanding tasks
Fuel Tank Capacity	Approximately 0.5 liters (16.9 fl. oz.)
Airflow Speed	Variable, up to high velocity
Noise Level	Meets applicable standards with proper muffler
Starter System	STIHL Easy2Start™
Anti-Vibration System	Integrated into handle design
Weight (without fuel)	Approximately 4.6 kg (10.1 lbs)
Warranty	Limited warranty, see documentation

Safety Information

Read and understand all instructions before operation. Always wear appropriate personal protective equipment (PPE).

1. Wear eye protection, hearing protection, long pants, sturdy gloves, and non-slip footwear.
2. Operate only in well-ventilated areas; never indoors or in enclosed spaces.
3. Keep bystanders, children, and pets at a safe distance (at least 15 meters).
4. Inspect the blower before each use for loose parts, damage, or leaks.
5. Use only STIHL-approved fuel mix and lubricants.

WARNING! Risk of fire, explosion, and serious injury. Fuel is highly flammable. Stop engine before refueling. Allow engine to cool.

Assembly & First Use

Unpack and inspect all parts. Assemble according to provided diagram.

1. Attach blower tube: Align tube with outlet, secure with locking collar.
2. Attach nozzle: Slide onto end of tube, secure if required.
3. Fuel mix: Use 50:1 high-quality 2-stroke engine oil with unleaded gasoline (minimum 89 octane). Mix thoroughly in separate container.
4. Starting: Place on clear, flat ground. Set master control lever to cold start position. Activate decompression valve. Pull starter rope smoothly until engine fires.

CAUTION! Never start the engine with the blower tube or nozzle attached if not properly secured.

Specifications

• Model: STIHL 550
• Engine Power: High-performance 2-stroke
• Displacement: 28.4 cc
• Fuel/Oil Mix: 50:1 (STIHL HP Ultra or equivalent)
• Sound Power Level: Compliant with relevant directives
• Vibration Levels (left/right): Reduced by anti-vibration system
• Warranty Period: Refer to your regional STIHL warranty statement
• Compliance: Meets EPA Phase 3 and applicable emissions standards

Controls and Operation

Master Control Lever: Choke/Start/Run/Stop positions. Throttle Trigger: Variable speed control. Throttle Lock: For continuous operation. Decompression Valve: Reduces pulling force for starting.

Starting Procedure (Cold Engine): Set master control to choke. Press fuel pump bulb 5-10 times. Pull starter rope until engine fires. Move lever to half-throttle position. Pull again to start. Allow brief warm-up.

Operation: Hold blower firmly with both hands. Use sweeping motions. Adjust throttle to match task. Do not point nozzle at people, animals, or loose debris that could become projectiles.

Fuel & Lubrication

Use only fresh, unleaded gasoline with a minimum octane rating of 89. Mix with STIHL HP Ultra 2-stroke engine oil at a 50:1 ratio.

1. Mix fuel in an approved, clean container.
2. Never mix directly in the blower's fuel tank.
3. Do not use fuel older than 30 days. Avoid ethanol blends above 10% if possible.
4. Lubricate gears in the blower tube drive (if applicable) with STIHL grease as per maintenance schedule.

Tip: Label your fuel mix container clearly. Store in a cool, dry place away from sparks or flames.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

1. Daily/Before Use: Check for loose fasteners, damage, leaks. Clean exterior.
2. Every 10 Hours: Check air filter, clean if necessary.
3. Every 50 Hours: Clean spark arrestor screen (if equipped). Check spark plug.
4. Every 100 Hours: Replace air filter, fuel filter, and spark plug. Clean cooling fins.
5. Annually/End of Season: Full service recommended by an authorized STIHL dealer.

WARNING! Always disconnect the spark plug boot before performing any maintenance.

Air Filter & Spark Plug

Air Filter: Remove cover, take out filter. Tap clean or wash in warm, soapy water. Allow to dry completely before reinstalling. Replace if torn or excessively dirty.

Spark Plug: Use recommended type (e.g., BOSCH WSR6F). Check gap (typically 0.020 inches / 0.5 mm). Replace if electrodes are worn or fouled.

Storage Guidelines

For storage longer than 30 days, prepare the blower to prevent fuel system issues.

1. Run the engine to consume fuel from the carburetor.
2. Drain all fuel from the tank into an approved container.
3. Start the engine again and let it run until it stops to clear the carburetor.
4. Remove spark plug, add a teaspoon of engine oil into the cylinder, pull starter slowly to coat internals, reinstall plug.
5. Clean entire unit thoroughly. Store in a dry, secure place.

CAUTION! Never store the blower with fuel in the tank for extended periods. This can cause gumming and carburetor damage.

Warranty Information

STIHL Limited Warranty: Covers defects in material and workmanship for a specified period from date of retail purchase. Warranty is valid only for the original purchaser and requires proof of purchase. Warranty does not cover damage from misuse, neglect, improper maintenance, or use of non-STIHL parts/fuel. For full warranty terms and period applicable in your region, contact your authorized STIHL dealer or visit www.stihlusa.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine will not start	No fuel, flooded, spark plug faulty	Check fuel level, use correct mix. Move master control to half-throttle and pull starter repeatedly (flooded). Check/replace spark plug.
Engine starts but dies	Clogged air filter, fuel filter, carburetor issues	Clean/replace air filter. Check fuel line and filter. May need carburetor adjustment by dealer.
Loss of power	Dirty air filter, clogged spark arrestor, old fuel	Clean air filter and spark arrestor screen. Use fresh fuel mix.
Excessive vibration	Loose parts, damaged impeller/fan	Check and tighten all fasteners. Inspect fan housing for debris or damage.
Unusual noise	Foreign object in impeller, bearing wear	Stop engine immediately. Inspect fan housing and impeller. Contact dealer.

Service: For repairs beyond basic maintenance, contact an authorized STIHL servicing dealer. Use only genuine STIHL parts.

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