Husqvarna 120 Mark III Gas Chainsaw User Manual

Introduction

This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Husqvarna 120 Mark III Gas Chainsaw. Please read this manual thoroughly before operating the chainsaw to ensure proper use and to prevent injury or damage.

The Husqvarna 120 Mark III is a 38-cc, 2-cycle gas chainsaw with a 16-inch bar, designed for wood cutting and tree pruning. It features X-TORQ® engine technology for improved fuel efficiency and reduced emissions, Air Injection™ for extended engine life, and LowVib® technology for comfortable use.

Safety Information

Always prioritize safety when operating a chainsaw. Failure to follow safety instructions can result in serious injury or death.

Personal Protective Equipment (PPE)

• Head Protection: Wear a safety helmet with a face shield or safety glasses.
• Hearing Protection: Use ear defenders or earplugs.
• Hand Protection: Wear heavy-duty work gloves.
• Leg Protection: Wear chainsaw protective trousers or chaps.
• Foot Protection: Wear steel-toed safety boots with good grip.

General Safety Precautions

• Never operate the chainsaw when fatigued or under the influence of alcohol or drugs.
• Ensure a clear work area free of obstacles and bystanders.
• Inspect the chainsaw before each use for damage, loose parts, or leaks.
• Always hold the chainsaw firmly with both hands.
• Be aware of kickback and how to avoid it.
• Do not operate the chainsaw in wet conditions or near flammable materials.

Components Overview

Figure 1: Husqvarna 120 Mark III Gas Chainsaw. This image shows the complete chainsaw assembly, including the engine housing, handle, and 16-inch guide bar with chain.

Figure 2: Chainsaw with 16-inch cutting bar and 38 cc engine. This image highlights the length of the cutting bar and the engine displacement.

Figure 3: Powerful and efficient X-TORQ® engine. This image illustrates the chainsaw in use, emphasizing the X-TORQ engine's benefits of reduced emissions and increased fuel efficiency.

Figure 4: LowVib® Technology. This image shows a close-up of the chainsaw in operation, highlighting the vibration reduction feature for more comfortable work.

Figure 5: Quick Start with Air Purge. This image focuses on the air purge bulb, indicating its function in removing air from the carburetor and fuel system for easier starting.

Figure 6: Air Injection® Technology. This image provides an internal view of the engine, illustrating how the centrifugal air cleaning system expels dust and debris to prolong engine life.

Figure 7: Independent Choke/Stop Switch. This image shows a close-up of the choke and stop switch, explaining how it helps prevent accidental flooding by automatically resetting.

Setup

Unpacking and Assembly

1. Carefully remove all components from the packaging.
2. Attach the guide bar and chain according to the instructions provided in the separate assembly guide (if applicable). Ensure the chain is correctly tensioned.
3. Verify all nuts and bolts are securely tightened.

Fuel and Chain Oil Mixture

The Husqvarna 120 Mark III uses a 2-cycle engine and requires a specific fuel mixture.

• Fuel: Use fresh, unleaded gasoline with an octane rating of 87 or higher.
• Oil: Mix with high-quality 2-stroke engine oil specifically designed for air-cooled engines, at a ratio of 50:1 (2% oil).
• Chain Oil: Fill the chain oil reservoir with high-quality bar and chain oil. Do not use waste oil or motor oil.

Warning: Always mix fuel in a well-ventilated area away from ignition sources. Store fuel in approved containers.

Operating Instructions

Starting the Chainsaw

1. Place the chainsaw on a firm, flat surface.
2. Engage the chain brake by pushing the hand guard forward.
3. Press the primer bulb several times until fuel is visible.
4. Pull the choke control out fully.
5. Hold the front handle firmly with one hand and place your foot on the rear handle.
6. Pull the starter cord with a smooth, steady motion until the engine fires (usually 1-3 pulls).
7. Once the engine fires, push the choke control in halfway.
8. Pull the starter cord again until the engine starts and runs.
9. Once the engine is running, disengage the chain brake by pulling the hand guard back.

Cutting Techniques

• Felling: Plan your felling direction, clear the area, and make proper felling cuts (notch and felling cut).
• Limbing: Work from the base of the tree towards the top, removing smaller branches first. Be aware of spring poles.
• Bucking: Cut logs into desired lengths. Support the log to prevent pinching the bar.

Caution: Always maintain a firm grip and balanced stance. Never cut above shoulder height.

Maintenance

Regular maintenance is crucial for the longevity and safe operation of your chainsaw.

Daily Maintenance

• Check chain tension and adjust if necessary.
• Inspect the chain for sharpness and damage. Sharpen or replace as needed.
• Clean the air filter.
• Check the chain oil level and refill.
• Clean the guide bar groove and oil holes.
• Inspect the chain brake for proper function.

Weekly/Monthly Maintenance

• Clean the spark plug and check the gap. Replace if worn.
• Clean the cooling fins.
• Check the starter cord and recoil spring.
• Inspect the fuel filter.

Storage

When storing the chainsaw for extended periods:

1. Drain the fuel tank and run the engine until it stops to clear the carburetor.
2. Drain the chain oil tank.
3. Clean the entire chainsaw thoroughly.
4. Remove the spark plug and add a small amount of 2-stroke oil into the cylinder, then pull the starter cord a few times to distribute. Reinstall the spark plug.
5. Store in a dry, well-ventilated area, out of reach of children.

Troubleshooting

Specifications

Warranty and Support

For warranty information and technical support, please refer to the official Husqvarna website or contact their customer service. Keep your proof of purchase for warranty claims.

Husqvarna Official Website: www.husqvarna.com

Customer Service: Refer to the contact information provided on the Husqvarna website for your region.