Owner Manual Stihl 070

The Stihl 070 is a professional-grade chainsaw designed for heavy-duty cutting tasks. It features a powerful engine, robust construction, and safety mechanisms for reliable operation in demanding conditions. Below are key sections covering safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly & Installation 3. First-Time Operation 4. Specifications 5. Controls and Functions 6. Chain & Bar Setup 7. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-performance engine, anti-vibration system, chain brake, decompression valve, automatic oiler, and ergonomic handles.

Feature	Description
Engine Type	2-stroke, single-cylinder, air-cooled
Displacement	Approx. 111.5 cc
Power Output	High torque for demanding cuts
Guide Bar Length	Typically 20" to 36" (varies by model)
Chain Brake	Inertia-activated for kickback protection
Anti-Vibration System	Reduces operator fatigue
Decompression Valve	Easier starting
Automatic Oiler	Lubricates chain during operation
Fuel Tank Capacity	Approx. 0.95 liters
Oil Tank Capacity	Approx. 0.55 liters

Assembly & Installation

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

Attach guide bar and chain: Place bar on mounting studs, fit chain with drive links in bar groove, tension correctly.
Install handle: Secure front and rear handles with provided bolts.
Fill fluids: Add recommended 2-stroke fuel mix (50:1) to fuel tank and bar/chain oil to oil tank.
Check all fasteners: Ensure all nuts, bolts, and screws are tightened securely.

WARNING! Always wear protective gloves during assembly. Ensure chain is properly tensioned to prevent derailment.

First-Time Operation

Before starting, perform pre-operation checks.

Safety gear: Wear helmet, eye protection, hearing protection, gloves, and chainsaw chaps.
Check chain tension: Chain should snap back when pulled from bar.
Start engine: Set master control lever to cold start position, pull starter cord until engine fires.
Warm-up: Allow engine to idle for 30 seconds before cutting.
Test chain brake: Engage manually to ensure proper function.

CAUTION! Never start the saw unless the chain is clear of obstructions and you are in a stable position.

Specifications

Model: Stihl 070
Engine: 2-stroke, 111.5 cc
Powerhead Weight: Approx. 9.5 kg (without bar/chain)
Fuel: Gasoline with 2-stroke oil (50:1 mix ratio)
Ignition System: Electronic, flywheel magneto
Chain Pitch: 3/8" or .404" (depending on configuration)
Chain Gauge: 0.063"
Sound Power Level: Typically 115 dB(A) – hearing protection required
Vibration Level: Reduced via anti-vibration handles

Controls and Functions

Master control lever: Combines stop switch, choke, and throttle lock. Throttle trigger: Controls engine speed. Chain brake lever: Manual engagement; inertia-activated. Decompression valve: Reduces cylinder pressure for easier starting. Throttle interlock: Must be depressed to operate throttle. Front hand guard: Protects hand and activates chain brake on kickback.

Maintenance Controls: Adjustable automatic oiler, chain tensioning screw, idle speed screw (carburetor).

Chain & Bar Setup

Proper chain installation is critical for safety and performance.

Select correct chain: Match pitch, gauge, and drive link count to bar.
Install chain: Ensure cutting teeth face forward on top of bar.
Tension chain: Adjust until snug against bar, but able to be pulled by hand.
Check lubrication: Ensure oil ports on bar are clear and oiler is functioning.

Tip: Always re-tension chain after first few minutes of operation as it stretches.

Operating Procedures

Follow safe cutting practices at all times.

Starting: Engage chain brake, set master control to cold start, pull starter firmly.
Cutting: Use full throttle when entering cut; let chain do the work.
Kickback avoidance: Do not cut with upper tip of bar; maintain firm grip.
Refueling: Stop engine and allow to cool before refueling.
Storage: Empty fuel tank for long-term storage; run carburetor dry.

WARNING! Never operate chainsaw above shoulder height or with one hand. Always plan escape path from falling material.

Safety Features

Chain Brake: Stops chain within milliseconds if activated manually or by inertia. Throttle Interlock: Prevents accidental throttle engagement. Right Hand Guard: Protects from chain breakage. Anti-Vibration System: Reduces fatigue and improves control. Decompression Valve: Makes starting safer and easier.

Maintenance & Cleaning

Regular maintenance ensures longevity and safety.

Daily: Clean air filter, check chain tension and sharpness, inspect bar for wear. Weekly: Clean cooling fins, check spark plug, clean fuel filter. Monthly: Check all fasteners, clean clutch area, inspect anti-vibration elements.

CAUTION! Always disconnect spark plug wire before performing maintenance. Use only Stihl-approved parts and lubricants.

Regulatory Information

Complies with ANSI B175.1 and EPA emissions standards for handheld power equipment. Contains parts that may be hot during/after operation. For warranty and service, contact authorized Stihl dealers. Original instructions; translations available. Copyright © by Stihl. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Old fuel, clogged filter, flooded engine	Use fresh fuel mix, clean air/fuel filter, wait 5 mins if flooded.
Engine runs but dies	Clogged carburetor, faulty spark plug	Clean carburetor, replace spark plug.
Chain doesn't turn	Clutch worn, drive sprocket damaged	Inspect clutch and sprocket; replace if necessary.
Excessive vibration	Loose fasteners, unbalanced chain	Tighten all bolts, sharpen and balance chain.
Chain oil not flowing	Clogged oil ports, empty oil tank	Clean oil passages, refill with correct bar oil.

Service: For repairs, contact authorized Stihl service center. Use genuine Stihl parts.