Wen Lumberjack Chainsaw Manual

The Wen Lumberjack Chainsaw is a powerful and reliable gas-powered chainsaw designed for professional and heavy-duty cutting tasks. It features a high-performance engine, automatic oiling system, safety chain brake, anti-vibration handles, and a durable guide bar. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: High-torque 2-stroke engine, Automatic chain oiler, Safety chain brake, Anti-vibration system, Quick-stop inertia brake, Side-access chain tensioner.

Assembly Instructions

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

1. Attach guide bar and chain: Place bar on mounting studs, align chain, adjust tension.
2. Install chain brake handle: Secure according to diagram in manual.
3. Fill oil reservoir: Use recommended bar and chain oil.
4. Mix fuel: Prepare 50:1 gas/oil mixture in separate container.
5. Prime and choke: Set choke and prime bulb before first start.

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

First-Time Operation

Complete assembly and perform safety checks before starting.

1. Check chain tension: Chain should snap back when pulled from bar.
2. Test chain brake: Engage brake to ensure proper function.
3. Start engine: Place on ground, engage throttle lock, pull starter cord.
4. Warm up: Allow engine to run at idle for 1-2 minutes.
5. Test cut: Begin with small diameter wood to familiarize with operation.

CAUTION! Always maintain secure footing. Keep bystanders at least 15 feet away.

Specifications

• Engine Type: 2-stroke, air-cooled.
• Displacement: 62cc.
• Power Output: 4.2 HP at 9,500 RPM.
• Fuel Capacity: 24 oz. (0.71 L).
• Oil Capacity: 12 oz. (0.35 L).
• Guide Bar Length: 20 inches.
• Chain Pitch: 0.375 inches (3/8").
• Chain Gauge: 0.050 inches.
• Weight: 14.5 lbs. (without fuel).
• Sound Level: 112 dB(A) at operator's ear.

Controls and Safety Features

Main Controls: Throttle trigger, Throttle lockout, Chain brake lever, Choke control, Decompression valve, Primer bulb.

Safety Features: Chain brake (inertia activated), Right-hand guard, Anti-vibration system, Spark arrestor muffler, Throttle lockout safety.

Operation: Always engage chain brake when carrying or not cutting. Use proper stance: left hand on front handle, right on rear. Maintain sharp chain for safe operation. Never operate above shoulder height.

Chain and Bar Maintenance

Regular maintenance ensures optimal performance and safety.

1. Chain sharpening: Use round file matching chain pitch (5/32" recommended).
2. Bar maintenance: Clean bar groove weekly, flip bar monthly for even wear.
3. Tension adjustment: Check before each use, adjust when chain sags.
4. Sprocket inspection: Replace if teeth are worn or chipped.
5. Lubrication: Ensure oiler is functioning; adjust flow if needed.

Tip: Always wear cut-resistant gloves when handling chain.

Fuel and Oil Requirements

Use fresh, high-quality unleaded gasoline with minimum 89 octane.

1. Fuel mixture: 50:1 ratio (2.6 oz. of 2-stroke oil per gallon of gas).
2. Oil type: Use JASO FD or ISO-L-EGD certified 2-stroke oil.
3. Chain oil: Use specially formulated bar and chain oil.
4. Storage: Never store fuel mixture more than 30 days.
5. Safety: Refuel only when engine is cool, in well-ventilated area.

WARNING! Never use automotive oil or diesel fuel. Avoid ethanol blends above 10%.

Starting and Stopping Procedures

Follow proper sequence to ensure safe operation.

1. Cold start: Set choke to full, press decompression valve, prime 5-6 times.
2. Starting position: Place on ground, secure with foot in handle.
3. Pull starter: Pull cord briskly until engine fires, then move choke to half.
4. Warm start: Choke off, no priming needed for warm engine.
5. Stopping: Release throttle, allow idle for 30 seconds, push stop switch.
6. Emergency stop: Engage chain brake and stop switch simultaneously.

CAUTION! Never drop-start or start while holding chainsaw. Always use two hands.

Care & Storage

Proper storage extends chainsaw life and ensures safety.

1. Clean after use: Remove sawdust from air filter, cooling fins, and housing.
2. Drain fuel: Run carburetor dry or use fuel stabilizer for storage.
3. Chain storage: Remove chain, clean, and coat with oil.
4. Bar storage: Clean groove, coat with grease to prevent rust.
5. Long-term storage: Store in dry place, cover to prevent dust accumulation.

CAUTION! Never store with fuel in tank for more than 30 days. Keep away from children.

Regulatory Information

EPA Certified: Meets EPA Phase 3 emissions standards. CARB Compliant: Approved for use in California. ANSI B175.1: Complies with safety standards for gasoline-powered chainsaws. Copyright © 2025 Wen Products; trademarks of Wen Products. For support, visit www.wenproducts.com or contact 1-800-232-1195.

Troubleshooting

Service Intervals: Air filter every 10 hours; Spark plug every 25 hours; Fuel filter every 50 hours.

Service: 1-800-232-1195; www.wenproducts.com