SEYVUM Brushless 12 Inch Cordless Chainsaw

1. Introduction

Thank you for choosing the SEYVUM Brushless 12 Inch Cordless Chainsaw. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your new tool. Please read this manual thoroughly before first use and keep it for future reference. This chainsaw is designed for cutting branches, logs, and small trees, offering powerful performance with the convenience of cordless operation.

2. Safety Information

Operating a chainsaw can be dangerous if proper safety precautions are not followed. Always prioritize your safety and the safety of others. Read and understand all warnings and instructions before use.

General Safety Rules

• Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety glasses, hearing protection, gloves, sturdy footwear, and head protection.
• Work Area: Ensure your work area is clear of obstacles, well-lit, and free from bystanders, especially children and pets.
• Inspect Before Use: Before each use, inspect the chainsaw for any damage, loose parts, or worn components. Ensure the chain is sharp and properly tensioned.
• Secure Grip: Always hold the chainsaw firmly with both hands, with thumbs and fingers encircling the handles.
• Avoid Kickback: Be aware of the kickback danger zone. Avoid cutting with the tip of the guide bar. Maintain a firm grip and proper stance.
• Battery Safety: Use only the specified batteries and charger. Do not expose batteries to water, heat, or direct sunlight. Store batteries in a cool, dry place.
• Proper Cutting Technique: Plan your cuts. Do not overreach. Maintain proper footing and balance at all times.
• Maintenance: Perform regular maintenance as described in this manual. Disconnect the battery before performing any maintenance or adjustments.

The SEYVUM chainsaw incorporates triple safety features: an extra handle for better control, a chain brake for immediate stopping, and a safety switch to prevent accidental starts.

3. Package Contents

Upon opening your SEYVUM Brushless 12 Inch Cordless Chainsaw package, please verify that all the following items are included:

• 1 x 20V Chainsaw (12-inch)
• 2 x 12" Chains
• 2 x 20V 4.0Ah Batteries
• 1 x 1.8A Dual Charger
• 1 x Gloves
• 1 x Protective Glasses
• 1 x User Manual (this document)

All items included in your SEYVUM 12 Inch Chainsaw package.

4. Product Components and Key Features

Familiarize yourself with the different parts of your SEYVUM chainsaw and its advanced features.

Chainsaw Diagram

Key components of the SEYVUM 12 Inch Chainsaw.

• Guide Bar: Supports and guides the saw chain.
• Chain: The cutting element of the chainsaw.
• Chain Brake: Safety mechanism to stop the chain quickly.
• Front Handle: For two-handed operation and control.
• Oil Tank Cover: Access point for adding bar and chain oil.
• Switch Lock Button: Must be pressed simultaneously with the switch to operate.
• Switch: Activates the chainsaw motor.
• Chain Tensioning Knob: Allows for tool-less adjustment of chain tension.
• Guide Bar Tightening: Secures the guide bar in place.

Key Features

• Powerful Brushless Motor: The upgraded pure copper brushless motor delivers 5800 RPM and 1200W of power, providing superior torque, longer run time, quieter operation, and smoother cuts. This design enhances cutting efficiency and reduces maintenance.


The powerful 1200W brushless motor ensures efficient and smooth cutting.

• Dual 4.0Ah Large-Capacity Batteries: Equipped with two 20V 4000mAh batteries, offering extended work time. Expect up to 100 cuts of 4x4 inch wood per charge, with approximately 45 minutes of run time. The included 1.8A fast dual port charger allows for efficient recharging.


Two 4.0Ah batteries provide ample power and extended runtime.

• Tool-Less Chain Tensioning: Adjusting the chain tension is quick and easy, requiring no additional tools. This system ensures optimal chain performance and prevents premature wear.

Effortless chain tension adjustment without the need for tools.
• Automatic Oiling System: The integrated automatic oiler continuously lubricates the chain and guide bar during operation, reducing friction, preventing wear, and extending the lifespan of the cutting components.


The automatic oiling system ensures continuous lubrication for optimal performance.

• High Quality and Tempered Saw Chain: The 12-inch chain is designed for high hardness, sharpness, wear-resistance, and a long lifespan, ensuring smooth and efficient cutting.


The durable 12-inch chain is designed for efficient and long-lasting cutting.

5. Setup

Before operating your chainsaw, follow these steps to ensure it is properly set up and ready for use.

5.1 Battery Charging

• Insert the 20V 4.0Ah batteries into the 1.8A dual charger.
• Plug the charger into a standard electrical outlet.
• Allow the batteries to charge fully before first use. The charger will indicate when charging is complete (refer to charger's indicator lights). A full charge typically takes approximately 2 hours per battery.

5.2 Chain Installation & Tensioning

The chainsaw comes with the guide bar and chain pre-installed, but it's crucial to check and adjust the tension before use.

• Ensure the battery is removed from the chainsaw.
• Locate the chain tensioning knob on the side of the chainsaw.
• Turn the knob to adjust the chain tension. The chain should be snug against the guide bar but still able to be pulled freely by hand. There should be no slack on the underside of the guide bar.
• Periodically check chain tension during operation, especially during the first few uses, as new chains can stretch.

5.3 Adding Bar & Chain Oil

• Ensure the battery is removed.
• Locate the oil tank cover on the chainsaw.
• Unscrew the cover and fill the oil tank with high-quality bar and chain oil. Do not use motor oil or other lubricants, as they may damage the automatic oiling system.
• Replace the oil tank cover securely.
• Check the oil level regularly during operation and refill as needed. The automatic oiling system requires a constant supply of oil to function correctly.

6. Operating Instructions

Follow these instructions for safe and effective operation of your SEYVUM chainsaw.

6.1 Starting the Chainsaw

• Ensure the battery is fully charged and securely inserted into the chainsaw.
• Hold the chainsaw firmly with both hands, maintaining a balanced stance.
• Press the safety switch lock button with your thumb.
• While holding the safety switch, squeeze the main switch (trigger) to start the chainsaw. The chain will begin to move.

6.2 Cutting Techniques

Always exercise caution and follow safe cutting practices.

• Limbing: When cutting branches, ensure the branch is stable. Cut from the top down to avoid pinching the bar.
• Bucking: When cutting logs, ensure the log is securely supported. If cutting a log on the ground, avoid cutting into the ground, which can dull the chain.
• Avoid Pinching: Be aware of the direction of pressure on the wood. If the wood closes on the chain, it can pinch the bar and stop the saw.
• Kickback Prevention: Always be aware of the guide bar tip. Avoid contact with the tip, as this is the primary cause of kickback.

The SEYVUM chainsaw is effective for cutting logs and branches.

6.3 Stopping the Chainsaw

• Release the main switch (trigger). The chain will stop moving.
• For immediate stopping in case of kickback or emergency, activate the chain brake by pushing it forward.
• Always remove the battery when the chainsaw is not in use, or before performing any adjustments or maintenance.

7. Maintenance

Regular maintenance ensures the longevity and optimal performance of your SEYVUM chainsaw.

7.1 Chain Lubrication

• The automatic oiling system requires regular refilling of the oil tank. Check the oil level frequently during operation.
• Use only recommended bar and chain oil.

7.2 Chain Sharpening

• A sharp chain is crucial for safe and efficient cutting. A dull chain will cause the saw to work harder, produce sawdust instead of chips, and increase the risk of kickback.
• Sharpen the chain regularly or replace it when it becomes dull or damaged. Refer to a professional or specific chain sharpening guides for detailed instructions.

7.3 Cleaning

• After each use, remove the battery and clean the chainsaw.
• Remove sawdust, wood chips, and debris from the guide bar, chain, and motor housing. Use a brush or compressed air.
• Wipe down the exterior with a damp cloth. Do not use harsh chemicals or abrasive cleaners.

7.4 Storage

• Store the chainsaw in a dry, secure location, out of reach of children and unauthorized users.
• Ensure the battery is removed before storage. For long-term storage, store batteries partially charged (around 50%) in a cool, dry place.

8. Troubleshooting

This section addresses common issues you might encounter with your SEYVUM chainsaw.

9. Specifications

10. Warranty and Support

SEYVUM stands by the quality of its products.

• Manufacturer's Promise: The product comes with an 18-month promise from the manufacturer. Please refer to the specific warranty terms provided with your purchase for details on coverage and claims.
• Return Policy: This product is eligible for a 30-day return policy for refund or replacement, subject to the retailer's terms and conditions.
• Extended Protection Plans: Additional protection plans may be available for purchase, offering extended coverage beyond the standard warranty. These plans typically cover 2-year or 3-year periods.
• Customer Support: For technical assistance, warranty claims, or general inquiries, please contact SEYVUM customer support through the retailer's platform or the official SEYVUM website.