Husqvarna 50 Chainsaw Manual

The Husqvarna 50 is a professional-grade chainsaw featuring a 50cc engine, designed for demanding cutting tasks. It includes safety features like a chain brake, throttle lock, and inertia-activated chain catcher, along with an anti-vibration system, automatic chain oiler, and easy-start technology. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 50cc 2-stroke engine, 16-20 inch guide bar, chain brake, anti-vibration system, automatic chain oiler, side-mounted chain tensioner, combined choke/stop control.

Assembly & Preparation

Unpack and inspect all components. Ensure all parts are present and undamaged.

1. Attach guide bar and chain: Place bar on mounting studs, fit chain with cutting teeth facing forward, adjust tension.
2. Fill fuel tank: Use fresh gasoline mixed with 2-stroke oil (50:1 ratio).
3. Fill chain oil tank: Use quality bar and chain oil.
4. Check chain brake: Ensure it moves freely and engages properly.

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

First-Time Operation

Before starting, ensure chainsaw is on flat, stable surface.

1. Activate chain brake: Push forward until it clicks.
2. Set choke: Move to cold start position.
3. Prime fuel pump: Press bulb 5-6 times.
4. Pull starter cord: Until engine fires, then move choke to run position.
5. Release chain brake: Pull back toward handle.
6. Test throttle: Ensure chain moves when throttle is engaged.

CAUTION! Never start the saw unless bar and chain are properly installed and tensioned.

Specifications

• Engine Displacement: 50cc (3.05 cu in).
• Power Output: 2.8 kW (3.8 hp).
• Fuel Consumption: Approx. 560 g/kWh.
• Sound Pressure Level: 114 dB(A).
• Vibration Levels: Front handle 4.2 m/s², rear handle 3.8 m/s².
• Weight (excl. cutting equipment): 5.7 kg (12.6 lbs).
• Recommended Bar Lengths: 16", 18", 20".
• Chain Pitch: 3/8" or .325".
• Spark Plug: NGK BPMR7A (gap 0.5 mm).
• Fuel Mix Ratio: 50:1 (2% oil).

Controls and Functions

Main controls located on handle assembly. Right side: Throttle trigger, throttle lockout. Left side: Chain brake lever, choke/stop control.

Handle Features: Front handle with vibration dampeners, rear handle with fuel and oil caps, master control lever (choke/stop), decompression valve (if equipped).

Chain Brake: Manual activation via left hand guard; inertia activation during kickback. Chain Tensioner: Side-mounted wheel for quick adjustment. Air Filter: Centrifugal cleaning with removable filter element. Spark Arrestor: Muffler with integrated screen.

Safe Operation Procedures

Always maintain secure footing and grip. Plan escape path from falling trees.

1. Check work area: Clear debris, ensure no bystanders within 15 feet.
2. Start safely: On ground with chain brake engaged.
3. Cutting techniques: Use full throttle, let chain do the work, avoid kickback zone.
4. Refueling: Stop engine, allow to cool, clean area around fuel cap.

Tip: Never cut above shoulder height or with the tip of the bar.

Maintenance Schedule

Regular maintenance ensures optimal performance and safety.

1. Daily: Check chain tension, sharpness, and lubrication; clean air filter; inspect bar for wear.
2. Weekly: Clean cooling fins; check spark plug; clean fuel filter.
3. Monthly: Check all nuts and bolts; clean chain brake mechanism; inspect anti-vibration elements.
4. Seasonally: Replace fuel filter; clean carburetor; check clutch and sprocket.

WARNING! Always disconnect spark plug wire before performing maintenance.

Chain & Bar Care

Proper chain maintenance extends life and improves cutting performance.

1. Sharpening: Use round file matching chain pitch (typically 5.5mm). Maintain 30° cutting angle.
2. Tensioning: Chain should snap back when pulled from bar.
3. Bar maintenance: Clean groove weekly; flip bar monthly for even wear.
4. Lubrication: Ensure oil port is clear; adjust oiler for cutting conditions.

CAUTION! Always wear gloves when handling chain.

Storage Guidelines

Prepare chainsaw for storage to prevent fuel system issues.

1. Empty fuel tank: Run engine until it stops from fuel starvation.
2. Remove chain and bar: Clean thoroughly, coat with oil.
3. Clean entire saw: Remove sawdust and debris.
4. Store: In dry place, covered, with chain brake disengaged.

CAUTION! Never store with fuel in tank for more than 30 days.

Regulatory Information

EPA Certified: Meets emission standards for handheld engines. CARB Compliant: Approved for use in California. EU Type Examination: Meets noise and vibration directives. Copyright © Husqvarna AB. All rights reserved. Husqvarna is a registered trademark. For support, visit www.husqvarna.com or contact 1-800-487-5962.

Troubleshooting

Reset: For electronic ignition models, disconnect spark plug for 30 seconds to reset.

Service: 1-800-487-5962; www.husqvarna.com