302 chainsaw manual

The 302 chainsaw is a professional-grade power tool designed for heavy-duty cutting applications. This manual covers the 302 model chainsaw with features including 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 brake, Throttle trigger, Choke control, Fuel tank, Oil reservoir.

Feature	Description
Engine displacement	50.2cc professional-grade engine
Guide bar length	16-inch standard bar (options: 14", 18")
Chain pitch	3/8" low-profile safety chain
Automatic oiling	Adjustable chain lubrication system
Safety features	Inertia-activated chain brake, hand guard
Anti-vibration	Reduced vibration handles for comfort
Easy-start system	Reduced pulling effort for starting
Fuel capacity	15.2 fl oz (450 ml) fuel tank
Oil capacity	8.5 fl oz (250 ml) oil reservoir
Weight	10.8 lbs (4.9 kg) without bar and chain

Assembly Instructions

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

1. Attach guide bar: Loosen bar nuts, position bar on studs, align chain groove.
2. Install cutting chain: Place chain over bar sprocket, ensure cutting teeth face forward.
3. Tension chain: Adjust tension screw until chain snaps back when pulled from bar.
4. Secure bar nuts: Tighten nuts while maintaining proper chain tension.
5. Fill reservoirs: Add 2-stroke fuel mix to fuel tank, bar & chain oil to oil reservoir.

WARNING! Always wear protective gloves during assembly. Ensure chain is properly tensioned before operation.

First-Time Setup

Prepare chainsaw for initial use following these steps.

1. Fuel mixture: Use 50:1 2-stroke oil to unleaded gasoline (minimum 89 octane).
2. Chain lubrication: Fill with quality bar & chain oil (not used motor oil).
3. Pre-start check: Verify chain tension, bar nuts tightness, safety features functional.
4. Starting procedure: Place on ground, engage chain brake, set choke, pull starter cord.

CAUTION! Never operate without proper personal protective equipment (PPE).

Specifications

• Engine Type: 2-stroke, single cylinder, air-cooled.
• Displacement: 50.2 cc (3.06 cu in).
• Power Output: 2.8 kW (3.8 hp) at 9,000 RPM.
• Fuel System: Diaphragm carburetor with manual choke.
• Ignition: Electronic, capacitor discharge.
• Starting System: Recoil starter with easy-start feature.
• Chain Speed: Maximum 21.5 m/s (4,250 ft/min).
• Sound Level: 105 dB(A) at operator's ear.
• Vibration Level: Front handle: 4.2 m/s², Rear handle: 5.1 m/s².

Controls and Settings

Main controls located on top and rear handles.

Front Handle: Throttle trigger, Throttle lockout, Chain brake lever.

Top Panel: Choke control, Stop switch, Decompression valve (if equipped).

Adjustments: Chain tension screw, Oil flow adjustment, Carburetor adjustment screws (H, L, T).

Safety: Chain brake activates manually via hand guard or automatically by inertia. Throttle lockout prevents accidental throttle engagement.

Chain Installation & Tensioning

Proper chain installation critical for safe operation.

1. Disengage chain brake before tensioning.
2. Loosen bar nuts with combination wrench.
3. Lift bar tip, adjust tension screw until chain fits snug against bar.
4. Chain should move freely by hand without binding.
5. Retighten bar nuts while holding bar tip up.

Tip: Check chain tension frequently during first hour of use as new chains stretch.

Operating Procedures

Follow these steps for safe cutting operation.

1. Starting: Engage chain brake, set choke, pull starter cord until engine fires.
2. Warm-up: Allow 30-60 seconds at idle before cutting.
3. Cutting technique: Use full throttle when cutting, let chain do the work.
4. Kickback prevention: Avoid contact with bar tip, maintain secure grip.
5. Shutdown: Allow to idle 30 seconds, press stop switch.
6. Transport: Always engage chain brake when carrying or moving.

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

Safety Features

Chain Brake: Stops chain within milliseconds if kickback occurs. Throttle Lockout: Must be depressed before throttle can be engaged. Hand Guard: Protects from kickback and debris. Right-Hand Guard: Covers chain brake lever. Anti-Vibration: Reduces operator fatigue.

Care & Maintenance

Regular maintenance ensures optimal performance and safety.

Daily: Clean air filter, check chain tension, inspect bar for wear.

Weekly: Clean cooling fins, check spark plug, clean fuel filter.

Monthly: Sharpen chain, clean carburetor, check all fasteners.

Storage: Drain fuel, run carburetor dry, clean thoroughly, store in dry place.

CAUTION! Always disconnect spark plug before performing maintenance.

Regulatory Information

EPA Phase III compliant for emissions. Meets ANSI B175.1 safety standards. CARB certified for sale in California. Contains FCC Part 15 Class B digital device. Copyright © 2025 Chainsaw Manufacturer. For technical support, contact 1-800-555-3020 or visit www.302chainsaw.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, compression	Check fuel mixture, spark plug, compression; ensure choke set properly.
Engine runs poorly	Air filter, carburetor	Clean/replace air filter; adjust carburetor; check fuel lines.
Chain doesn't turn	Brake engaged, clutch	Disengage chain brake; check clutch drum and springs.
Excessive vibration	Loose components	Tighten all fasteners; check anti-vibration mounts.
Chain won't oil	Oil flow, reservoir	Check oil level; clean oil ports; adjust oil flow screw.
Chain dulls quickly	Improper filing, dirt	Sharpen at correct angle; clean bar groove; check alignment.

Service Intervals: First service at 5 hours, then every 25 hours of operation.

Authorized Service: 1-800-555-3020; www.302chainsaw.com/service