stihl 031av manual pdf

The STIHL 031 AV is a professional-grade gasoline-powered chainsaw featuring an anti-vibration (AV) system, automatic oiling, and a reliable two-stroke engine. This manual covers essential safety procedures, technical specifications, operation instructions, maintenance schedules, and troubleshooting for the STIHL 031 AV chainsaw. Below are key sections for safe and effective use.

Safety Warnings & Symbols

Critical safety information to prevent serious injury or death. Understand all symbols and warnings before operation.

Specifications & Components

Key technical data and identification of major parts.

• Model: STIHL 031 AV
• Engine Type: Single-cylinder, two-stroke, air-cooled
• Displacement: 49.0 cc (3.0 cu. in.)
• Power Output: 2.5 kW (3.4 hp)
• Fuel Tank Capacity: 0.55 L (18.6 fl. oz.)
• Oil Tank Capacity: 0.26 L (8.8 fl. oz.)
• Guide Bar Lengths: 40 cm (16"), 45 cm (18")
• Chain Pitch: 3/8"
• Weight (without cutting equipment): 6.2 kg (13.7 lbs)
• Ignition System: Electronic (Flywheel magneto)
• Anti-Vibration System: Yes (AV)
• Automatic Oiling: Yes (with manual override)

Assembly & Initial Setup

Unpacking and preparing the chainsaw for first use.

1. Inspect Contents: Ensure all parts are present and undamaged.
2. Attach Guide Bar & Chain: Place bar on studs, fit chain with drive links in bar groove, tension correctly.
3. Fill Chain Oil Tank: Use STIHL or approved biodegradable chain oil.
4. Check Chain Brake: Ensure front hand guard/chain brake moves freely and engages properly.
5. Inspect Controls: Verify throttle trigger, throttle trigger lockout, and stop switch function correctly.

WARNING! Never attempt assembly or adjustments with the engine running. Ensure the chain brake is engaged during assembly.

Fuel & Lubricant Mix

Correct fuel mixture is critical for engine life and performance.

• Fuel Type: Unleaded gasoline with a minimum octane rating of 89 (RON).
• Oil Type: High-quality two-stroke engine oil meeting API TC or JASO FD classification (e.g., STIHL HP Ultra).
• Mixing Ratio: 50:1 (2% oil). For 1 gallon of gasoline, add 2.6 fl. oz. of two-stroke oil.
• Mixing Procedure: Add oil to an approved fuel can, then add gasoline. Shake vigorously before filling saw.
• Chain Oil: Use only specified chain and bar oil for lubrication. Do not use waste oil.

CAUTION! Never use automotive motor oil, diesel, or pre-mixed fuel older than 30 days. Store fuel in approved containers away from sparks or flame.

Starting & Stopping Procedures

Cold Start, Warm Start, and Safe Shutdown.

1. Cold Start:
   • Engage chain brake. Set master control lever to choke position (full down).
   • Press decompression valve (if equipped).
   • Pump primer bulb 5-7 times until fuel is visible.
   • Place saw on firm ground, hold front handle with left hand, place right foot through rear handle.
   • Pull starter rope sharply until engine fires (usually 3-5 pulls).
   • Move master control lever to half-throttle position. Pull starter rope again to start.
   • Briefly blip throttle to disengage fast idle.
2. Warm Start: Set master control lever to half-throttle position. Pull starter rope.
3. Stopping: Release throttle, allow engine to idle briefly. Press and hold the stop switch/stop button until engine comes to a complete stop.

WARNING! Always start the saw at least 10 feet from the fueling area. Ensure the chain brake is engaged when starting.

Operation & Cutting Techniques

Proper handling and cutting methods for safety and efficiency.

• Grip: Hold front handle with left hand, rear handle with right hand. Thumbs wrapped underneath.
• Stance: Stand with feet shoulder-width apart, left foot slightly forward for balance.
• Basic Cuts:
  1. Felling: Use proper notch and back cut techniques. Plan escape path.
  2. Limbing: Cut from trunk outward. Support limb if possible.
  3. Bucking: Support log off ground. Cut from top down, avoid pinching chain.
• Kickback Prevention: Always engage the chain brake when not cutting. Do not cut with the tip (nose) of the bar. Maintain sharp chain and proper tension.

Maintenance Schedule

Routine checks and services to ensure longevity and safe operation.

Chain Sharpening & Tensioning

Maintaining a sharp, properly tensioned chain is essential for safety and performance.

1. Tensioning:
   • Loosen bar nuts with combination wrench.
   • Using scrench tool, turn tensioning screw clockwise until chain fits snugly against bar, but can be pulled around by hand.
   • Lift tip of bar up, then retighten bar nuts securely.
   • Re-check tension after first few minutes of operation.
2. Sharpening:
   • Use correct round file size (typically 4.0 mm or 5/32" for 3/8" pitch chain).
   • File at specified angle (usually 30°) using a filing guide for consistency.
   • File all cutters to equal length. Lightly file down depth gauges (rakers) with a flat file and gauge.

CAUTION! Always wear heavy gloves when handling the chain. Ensure the saw is off and cool before servicing.

Carburetor Adjustment

Fine-tuning for optimal performance. Screws are marked L (Low speed), H (High speed), and LA (Idle).

1. Start with factory settings: L = 1 turn open, H = 1 turn open from lightly seated.
2. Warm up engine fully.
3. Idle Speed (LA): Adjust so chain does not move when idling with brake disengaged.
4. Low Speed (L): Adjust for smooth acceleration from idle without hesitation.
5. High Speed (H): Adjust for maximum RPM without exceeding specified limit (consult tachometer).
6. Re-check idle after adjusting L and H.

WARNING! Incorrect adjustment can cause engine damage or unsafe operation. If unsure, have adjustment performed by an authorized STIHL dealer.

Storage Guidelines

Preparing the chainsaw for long-term storage.

1. Drain all fuel from the tank and run the engine until it stops to clear the carburetor.
2. Remove spark plug, add a teaspoon of engine oil into the cylinder, pull starter rope slowly to distribute, reinstall plug.
3. Clean the entire saw thoroughly, removing sawdust and resin.
4. Remove chain and guide bar, clean, and coat with oil.
5. Store in a dry, clean, and secure place, out of reach of children.

CAUTION! Never store the saw with fuel in the tank for more than 30 days. Old fuel can cause starting problems and damage the engine.

Troubleshooting

Service: For complex repairs, contact an authorized STIHL servicing dealer. Find a dealer at www.stihlusa.com or call 1-800-467-8445.