STIHL 028 AV Chainsaw Manual

The STIHL 028 AV is a professional-grade chainsaw featuring anti-vibration (AV) technology, a robust engine, and a range of safety and performance features. This manual covers essential information for safe operation, maintenance, troubleshooting, and technical specifications. Below are key sections for safety warnings, features, assembly, operation, maintenance, and troubleshooting.

Safety Warnings & Precautions

Critical safety information to prevent injury or damage. Always read before operation.

Warning	Description
Personal Protective Equipment	Always wear safety glasses, hearing protection, gloves, chainsaw chaps, and sturdy boots.
Kickback Danger	Be aware of kickback zone; use reduced-kickback chain and proper handling techniques.
Fuel Safety	Refuel in well-ventilated area, away from ignition sources. Use approved fuel containers.
Two-Handed Operation	Always grip with both hands; maintain secure footing.
Chain Brake	Test chain brake before each use; engage when carrying or not cutting.
Hot Surfaces	Avoid contact with muffler and cylinder during/after operation.
Electrical Hazards	Do not operate near power lines or electrical sources.
Bystanders	Keep others at a safe distance (at least 10 feet).
Fatigue	Take regular breaks to maintain alertness.
Transport	Engage chain brake and use scabbard when transporting.

Features & Components

Key components of the STIHL 028 AV chainsaw.

1. Engine: 2-stroke, single-cylinder with electronic ignition.
2. Anti-Vibration System (AV): Reduces operator fatigue.
3. Chain Brake: Inertia-activated for kickback protection.
4. Throttle Interlock: Prevents accidental throttle engagement.
5. Decompression Valve: Easier starting.
6. Automatic Oiling: Adjustable bar and chain lubrication.
7. Quickstop®: Stops chain if kickback occurs.
8. Side Access Chain Tensioner: Easy chain adjustment.
9. Fuel & Oil Caps: Large openings for easy filling.
10. Spark Arrestor Muffler: Reduces fire risk.

WARNING! Familiarize yourself with all controls before starting.

Assembly & Preparation

Steps to assemble and prepare the chainsaw for first use.

1. Attach guide bar: Place bar onto studs, align chain with drive sprocket.
2. Install chain: Ensure cutting teeth face forward on top of bar.
3. Tension chain: Adjust side tensioner until chain snaps back when pulled from bar.
4. Fill fuel: Mix STIHL 2-stroke oil with unleaded gasoline (50:1 ratio).
5. Fill chain oil: Use STIHL chain oil or equivalent.
6. Check controls: Verify throttle, choke, and chain brake function.

CAUTION! Always wear gloves when handling chain. Ensure bar nuts are tightened securely.

Technical Specifications

• Engine Displacement: 48.7 cc (2.97 cu in).
• Power Output: 3.0 bhp.
• Fuel Capacity: 0.55 US pt (0.26 L).
• Oil Capacity: 0.42 US pt (0.20 L).
• Guide Bar Lengths: 16", 18", 20" (recommended).
• Chain Pitch: 3/8" or .325".
• Chain Gauge: 0.050" or 0.058".
• Weight (without bar/chain): 12.1 lbs (5.5 kg).
• Sound Pressure Level: 106 dB(A).
• Vibration Levels: Front handle 4.2 m/s², rear handle 4.8 m/s².

Controls & Operation

Location and function of all controls.

Controls: Master Control Lever (choke/start/run), Throttle Trigger, Throttle Interlock, Chain Brake Lever, Decompression Valve, Fuel Primer Bulb, Stop Switch.

Starting Procedure (Cold Engine):

1. Engage chain brake.
2. Set Master Control to choke position.
3. Press decompression valve (if equipped).
4. Pull starter rope until engine fires.
5. Move Master Control to half-throttle position.
6. Pull starter rope until engine starts.
7. Blip throttle to disengage fast idle.

Operation Tips: Use full throttle when cutting; allow chain to do the work. Avoid pinching bar.

Chain & Bar Maintenance

Regular maintenance for optimal cutting performance and safety.

1. Chain Sharpening: File at 30° angle; maintain depth gauges.
2. Chain Tension: Check frequently; adjust when loose (cool chain only).
3. Bar Maintenance: Clean bar groove; flip bar regularly for even wear.
4. Sprocket Inspection: Replace if worn or damaged.
5. Lubrication: Ensure oiler is working; check oil output.

Tip: A sharp chain reduces kickback risk and improves efficiency.

Engine Maintenance

Engine care for longevity and reliability.

Component	Maintenance Interval	Action
Air Filter	Daily or as needed	Clean with soap/water; replace if damaged.
Spark Plug	Every 50 hours	Clean and gap to 0.020" (0.5 mm).
Fuel Filter	Annually	Replace.
Cylinder Fins	Weekly	Clean debris for proper cooling.
Muffler & Spark Arrestor	Every 100 hours	Clean screen.
Carburetor Adjustment	As needed	Adjust idle (L) and high-speed (H) screws.

WARNING! Let engine cool before performing maintenance.

Fuel & Lubrication

Proper fuel mix and lubrication guidelines.

Fuel: Use 89 octane unleaded gasoline mixed with STIHL 2-stroke oil at 50:1 ratio (2.6 oz oil per 1 gallon gas). Do not use fuel older than 30 days.

Chain Oil: Use STIHL chain oil or ISO viscosity class: SAE 30 (summer), SAE 10 (winter). Adjust oiler for cutting conditions.

CAUTION! Never use straight gasoline or automotive oil. Store fuel in approved container.

Storage Guidelines

Preparing chainsaw for long-term storage.

1. Drain fuel tank and run engine until it stops.
2. Remove spark plug; add 1 teaspoon of oil through spark plug hole.
3. Pull starter rope slowly to distribute oil.
4. Clean entire saw; apply light oil to bar and chain.
5. Store in dry, secure place away from children.

Tip: Use fuel stabilizer if storing less than 30 days.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No spark, flooded, old fuel	Check spark plug; use fresh fuel; follow starting procedure.
Engine runs poorly	Dirty air filter, clogged fuel filter	Clean/replace filters; adjust carburetor.
Chain doesn't turn	Brake engaged, worn sprocket	Disengage chain brake; inspect clutch/sprocket.
Excessive vibration	Loose parts, unbalanced chain	Tighten all fasteners; sharpen chain evenly.
Chain throws oil	Over-oiling	Adjust oiler to lower setting.
Chain dulls quickly	Hitting ground, dirty wood	Avoid contact with soil; sharpen properly.
Overheating	Dirty cooling fins, lean mixture	Clean fins; check carburetor settings.

Reset: For electronic ignition issues, consult authorized STIHL dealer.

Warranty & Support

STIHL Limited Warranty: 1 year for residential use; 90 days for commercial. Proof of purchase required.

Service: For repairs, use authorized STIHL servicing dealers only. Do not attempt major repairs yourself.

Contact: STIHL Incorporated, 536 Viking Drive, Virginia Beach, VA 23452. Customer Support: 1-800-467-8445. Website: www.stihlusa.com.

Parts: Use only genuine STIHL replacement parts for safety and performance.