680 chainsaw manual

The 680 chainsaw is a professional-grade power tool designed for heavy-duty cutting tasks, featuring a high-performance engine, automatic chain oiling system, safety chain brake, anti-vibration handles, and easy-start technology. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: High-torque engine, Guide bar, Cutting chain, Chain tensioner, Chain brake, Throttle trigger, Safety lock, Fuel tank, Oil tank.

Feature	Description
Engine displacement	68cc high-performance 2-stroke engine
Guide bar length	20-inch professional cutting bar
Chain speed	High-speed cutting chain with automatic oiling
Chain brake	Inertia-activated safety brake system
Anti-vibration system	Reduced vibration handles for comfort
Fuel capacity	24 oz. fuel tank for extended operation
Oil capacity	12 oz. chain oil reservoir
Starting system	Easy-start decompression valve
Weight	14.5 lbs (without bar and chain)
Warranty	2-year limited warranty

Assembly & Preparation

Unpack and inspect all components. Assemble on clean, flat surface.

1. Attach guide bar: Remove side cover, align bar with sprocket, secure with nuts.
2. Install cutting chain: Place chain on bar with cutting teeth forward, adjust tension.
3. Fill fuel tank: Mix 50:1 gasoline with 2-stroke oil (89 octane minimum).
4. Fill chain oil: Use quality bar and chain oil in separate reservoir.
5. Check all fasteners: Ensure all bolts and nuts are properly tightened.

WARNING! Always wear protective gear: safety glasses, gloves, ear protection, and chainsaw chaps.

First-Time Setup

Complete assembly before first use.

1. Chain tension adjustment: Use side tensioner to proper tightness (should lift slightly from bar).
2. Test chain brake: Engage brake by pushing forward; should stop chain instantly.
3. Check throttle operation: Trigger should move smoothly, return quickly.
4. Test start procedure: Follow starting instructions in safe area.
5. Run-in period: Operate at varying speeds for first 30 minutes to seat components.

CAUTION! Never operate without proper chain tension and lubrication.

Specifications

• Engine Type: 2-stroke, single cylinder, air-cooled.
• Displacement: 68cc.
• Power Output: 4.5 HP at 9,000 RPM.
• Fuel System: Diaphragm carburetor with manual choke.
• Ignition: Electronic CDI ignition.
• Bar Length: 20 inches (50cm).
• Chain Pitch: 3/8 inch.
• Chain Gauge: .050 inch.
• Fuel Capacity: 24 oz. (710ml).
• Oil Capacity: 12 oz. (355ml).
• Weight: 14.5 lbs (6.6kg) without bar and chain.

Controls and Settings

Main Controls: Throttle trigger, Safety lock, Chain brake, Choke, Decompression valve, Stop switch.

Adjustments: Chain tension (side knob), Idle speed (screw), High/Low carburetor adjustment screws.

Operation: Start with choke on, decompression valve pressed. Run with choke off. Stop using stop switch. Safety: Chain brake activates on kickback or manually. Always engage safety lock when not cutting.

Connecting Accessories

Optional accessories: Carrying case, Extra chains, Sharpening kit, Scabbard, Maintenance tools.

1. Ensure chainsaw is off and cool before attaching accessories.
2. Use only manufacturer-approved accessories.
3. Store chainsaw in carrying case when not in use.
4. Use scabbard to protect chain during transport.

Tip: Keep spare chains properly tensioned and sharpened for quick changes.

Operating Procedures

Supports cutting of wood, pruning, felling, and bucking.

1. Starting: Set on flat surface, engage chain brake, set choke, pull starter cord.
2. Warm-up: Allow 30 seconds at idle before cutting.
3. Cutting position: Stand with feet shoulder-width apart, firm grip on handles.
4. Basic cuts: Use lower part of bar for cutting, avoid tip to prevent kickback.
5. Felling trees: Use proper notch and back cut techniques.
6. Bucking: Cut fallen logs from top side, support properly.
7. Pruning: Cut branches from bottom up when possible.
8. Shutdown: Allow to idle 30 seconds, engage chain brake, press stop switch.

WARNING! Always be aware of kickback zone (upper tip of bar). Never cut above shoulder height.

Safety Features

Chain Brake: Stops chain within milliseconds of kickback. Safety Lock: Prevents accidental throttle engagement. Throttle Lockout: Must be depressed before throttle works. Anti-Vibration: Reduces operator fatigue. Spark Arrestor: Prevents fire in dry conditions.

Care & Maintenance

Daily maintenance: Clean air filter, check chain tension, inspect bar for wear, clean cooling fins.

Weekly: Sharpen chain, clean spark arrestor, check all fasteners.

Monthly: Clean fuel filter, check fuel lines, inspect spark plug.

Seasonal: Replace fuel filter, clean carburetor, check piston through exhaust port.

CAUTION! Always disconnect spark plug wire before performing maintenance.

Regulatory Information

EPA Phase III compliant: Meets emission standards. CARB certified for California use. ANSI B175.1 safety standard compliant. Contains FCC Class B digital device. Copyright © 2025 Chainsaw Manufacturer. For support, visit www.chainsawmanufacturer.com or contact 1-800-555-CHAINS.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Won't start	Fuel, spark, compression	Check fuel mix, spark plug, compression; clean carburetor.
Runs then dies	Fuel flow, air leak	Check fuel filter, fuel lines, carburetor gaskets.
Poor cutting performance	Dull chain, wrong tension	Sharpen chain, adjust tension, check bar wear.
Chain won't stop	Brake mechanism	Check brake band, clean mechanism, replace if worn.
Excessive vibration	Balance, mounts	Check crankshaft balance, engine mounts, bar alignment.
Chain throws oil	Oil pump, adjustment	Adjust oil flow, check pump operation, clean oil ports.
Overheating	Air flow, fuel mix	Clean cooling fins, check fuel mixture, adjust carburetor.

Reset: Allow to cool completely if overheated.

Service: 1-800-555-CHAINS; www.chainsawmanufacturer.com