stihl 070 manual

The STIHL 070 is a professional-grade gasoline-powered chainsaw designed for heavy-duty cutting applications. It features a high-performance engine, robust construction, automatic chain oiling, anti-vibration system, and safety features including a chain brake and throttle lockout. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Engine, guide bar, cutting chain, chain brake, throttle trigger, choke control, fuel and oil tanks.

Assembly & Preparation

Unpack and inspect all parts. Assemble on a clean, stable surface.

1. Attach Guide Bar & Chain: Place bar on studs, fit chain over sprocket and bar, tension correctly.
2. Fill Fuel Tank: Use fresh gasoline mixed with STIHL 2-stroke oil at 50:1 ratio.
3. Fill Chain Oil Tank: Use STIHL chain oil or equivalent.
4. Check Controls: Ensure throttle trigger, choke, and chain brake function smoothly.

WARNING! Always wear protective gear: gloves, eye protection, hearing protection, chainsaw chaps, and sturdy boots.

First-Time Operation

Start the saw in a clear, open area, free of debris and flammable materials.

1. Starting Procedure: Set master control lever to choke (cold start), pull starter rope until engine fires, move lever to run position, pull again to start.
2. Warm-Up: Allow engine to idle for 30 seconds before cutting.
3. Chain Brake Test: Engage and disengage brake to ensure proper function.
4. Adjust Chain Tension: Chain should snap back when pulled from bar; adjust as needed.

CAUTION! Keep bystanders and pets at least 15 feet away during operation.

Specifications

• Engine: 2-stroke, 111 cc displacement.
• Powerhead Weight: Approx. 15.4 lbs (without bar/chain).
• Fuel Tank Capacity: Approx. 1.3 pints (620 ml).
• Oil Tank Capacity: Approx. 0.63 pints (300 ml).
• Ignition System: Electronic, flywheel magneto.
• Carburetor: Diaphragm type with adjustable H and L needles.
• Max Recommended Bar Length: 36 inches.
• Sound Power Level: Typically 112 dB(A). Wear hearing protection.
• Vibration Levels: Front/Rear handles measured per ISO standards.

Controls and Functions

Master Control Lever: Combines stop switch, choke, and run positions. Throttle Trigger: Controls engine speed. Throttle Lockout: Must be depressed to engage throttle. Chain Brake Lever: Manual engagement; also inertia-activated. Decompression Valve: Reduces cylinder pressure for easier starting. Chain Tensioner: Adjusts via side-mounted screw.

Adjustments: Carburetor (H/L screws) for idle and high-speed performance. Chain Oiler: Adjustable screw controls oil flow rate.

Fuel & Lubrication

Use fresh, unleaded gasoline (min 89 octane) mixed with STIHL 2-stroke engine oil at 50:1 ratio. For chain lubrication, use STIHL chain oil or a quality biodegradable bar & chain oil.

1. Mix fuel in a clean, approved container. Shake well.
2. Fill fuel tank on level ground, avoiding spillage.
3. Check oil level before each use; refill as needed.
4. Adjust oiler for cutting conditions (more oil for hard/dry wood).

Tip: Never use straight gasoline, old fuel mix, or motor oil in the chain oil tank.

Cutting Techniques

Always maintain a firm grip with both hands. Use proper stance and let the saw do the work.

1. Felling: Plan escape path. Use notch and back cut techniques.
2. Limbing: Work from trunk outward, keep saw close to body.
3. Bucking: Support logs properly; avoid cutting into ground.
4. Kickback Prevention: Keep nose of bar away from objects; maintain chain sharpness and tension.
5. Pinch Prevention: Understand compression and tension sides of wood.

WARNING! Never operate above shoulder height or on a ladder. Beware of kickback.

Maintenance Schedule

Daily: Check chain tension, sharpness, and lubrication. Clean air filter, check for loose parts. Weekly: Clean cooling fins, spark arrestor screen (if equipped). Check spark plug condition. As Needed: Sharpen chain, clean fuel filter, replace worn sprocket, clean carburetor.

Storage Guidelines

For long-term storage: Run carburetor dry or add fuel stabilizer. Drain fuel tank and run engine until it stops. Remove chain, clean, and soak in oil. Store in a dry, secure place, out of reach of children.

CAUTION! Fuel is flammable. Store fuel mix in a labeled, approved container away from heat sources.

Safety Information

Read manual thoroughly before use. Always wear Personal Protective Equipment (PPE). Inspect saw before each use. Do not operate when tired or under influence. Be aware of your surroundings. Use extreme caution when cutting. The chain brake is a safety device, not a substitute for safe practices. Comply with all local regulations.

Troubleshooting

Service: For major repairs, contact an authorized STIHL servicing dealer.

Support: Refer to your local STIHL dealer or www.stihlusa.com for manuals and parts.