How to String a Kobalt Brushless Weed Eater? Easy Line Install

Introduction

You’re halfway through edging your lawn, and your Kobalt Brushless Weed Eater sputters and drops the last of its trimmer line mid-pass. No need to panic, and you definitely don’t need to run to the hardware store for a new tool. Learning how to string a Kobalt Brushless Weed Eater? is a simple, 10-minute task that saves you money on replacement parts and gets you back to yard work fast. Kobalt’s brushless models are built for durability and consistent performance, but even the best weed eaters need fresh line every few uses, especially if you’re cutting thick weeds, working on rocky terrain, or edging along hard concrete. This comprehensive guide covers everything from prepping your workspace to testing the newly installed line, plus pro tips to avoid common errors and extend the life of your trimmer line. Whether you’re a first-time DIYer or a seasoned landscaper, you’ll have your tool running like new by the end of this walkthrough.

• Introduction
• Trimmer Head Overview for Kobalt Brushless Models
• Required Tools and Replacement Line
• Critical Safety Precautions
• Step-by-Step Line Installation Process
• Bump Feed vs. Automatic Feed Systems: What’s the Difference?
• Choosing the Right Replacement Line for Your Kobalt Brushless Weed Eater
• Tips for Extending Trimmer Line Life
• Common Mistakes to Avoid When Stringing Your Weed Eater
• Troubleshooting Common Post-Installation Issues
• Frequently Asked Questions
• Conclusion

Trimmer Head Overview for Kobalt Brushless Models

Kobalt Brushless weed eaters typically use one of two common trimmer head designs: the bump feed head and the automatic feed head. Both are engineered for quick, tool-free line replacement, but the process varies slightly between the two. Most entry-level and mid-range Kobalt Brushless models, such as the 20V and 40V lines, come with a bump feed head, which requires you to bump the bottom of the trimmer head against the ground to release more line as you work. Higher-end models, including the 80V commercial-grade line, often feature an automatic feed system that extends line automatically as you rev the motor, eliminating the need for manual bumping.

Regardless of which head you own, the core process of removing the old line, measuring and cutting new line, and loading it into the head is nearly identical. The brushless motor itself does not change the line replacement workflow, but it does produce less vibration and have a longer runtime than brushed motor models, meaning you’ll likely go through trimmer line more slowly over time. Knowing which type of head you own is the first step to a successful line replacement, as it will determine how you test the line after installation. If you’re unsure which system your model uses, check the bottom of the trimmer head: bump feed heads have a small, spring-loaded bump button, while automatic feed heads have a small motorized gear visible on the side.

Required Tools and Replacement Line

Before you start the replacement process, gather all the necessary tools and supplies to avoid interruptions mid-task. Having everything on hand will make the process faster and more efficient. You will need:

• Replacement trimmer line (correct size and diameter for your model – see the section on choosing the right line for details)
• Sharp scissors or a dedicated trimmer line cutter
• Work gloves (to protect your hands from sharp line edges)
• Clean, dry rag (to wipe down the trimmer head and remove debris)
• Flathead screwdriver (optional, for stuck trimmer heads)
• Safety glasses (mandatory for all power tool work)

Most Kobalt Brushless weed eaters come with a small amount of replacement line included in the box, but it’s a good idea to keep an extra spool on hand for quick replacements. You can purchase OEM Kobalt replacement line at most hardware stores, or order it directly from Kobalt’s website for your specific model.

Critical Safety Precautions

Even though stringing a weed eater is a low-risk task, you’re working with a power tool and sharp trimmer line, so taking a few minutes to prep safely will prevent preventable injuries. Follow these precautions before you start any work:

1. Always disconnect the battery pack first: Even if the tool is turned off, an accidental trigger press can cause the line to spin at high speeds and cut you. Remove the battery pack from the weed eater and set it aside in a safe spot, out of reach of children or pets.
2. Wear personal protective equipment (PPE): Safety glasses will protect your eyes from flying debris or sharp line ends, and work gloves will prevent cuts from the sharp edges of new trimmer line.
3. Work in a clear, well-lit space: Choose a flat, stable surface free of tripping hazards, so you don’t accidentally drop the tool or step on loose line. Avoid working in damp or wet conditions, as this can increase the risk of slipping.
4. Never test the line with the battery connected: Wait until the trimmer head is fully reassembled before reconnecting the battery and testing the tool. Testing individual components with the battery connected is a common cause of preventable injuries.

Step-by-Step Line Installation Process

Once you’ve gathered your tools and taken safety precautions, follow these steps to string your Kobalt Brushless Weed Eater quickly and correctly. The process takes 10 minutes or less for most users.

Step 1: Prepare the Weed Eater

Start by placing the weed eater on a flat, stable surface, like a workbench or level ground. If your model has an adjustable shaft, lock it in the shortest position to make it easier to handle the trimmer head. Use your clean rag to wipe away any grass, dirt, or debris from the trimmer head and the area around the line outlet. This prevents dirt from getting inside the head and jamming the line feed mechanism.

Next, release the trimmer head from the drive shaft. For bump feed heads, press the small release button on the bottom of the head and pull it straight off the shaft. For automatic feed heads, twist the head counterclockwise until it releases from the drive shaft. If the head is stuck, use a flathead screwdriver to gently pry the release tab, but take care not to crack the plastic housing. Set the head aside on your work surface.

Step 2: Remove the Old Trimmer Line

Once the trimmer head is removed, you’ll be able to access the line spool inside the housing. Start by unwinding any remaining line from the spool. If the line is tangled or stuck, use your scissors to cut it free, being careful not to cut or damage the spool itself. Once all the old line is removed, pull the spool straight out of the housing. Some models have a small retaining clip that holds the spool in place – if you can’t pull the spool out, look for a small plastic clip on the side of the head, press it down, and pull the spool free.

Discard the old line properly, as loose trimmer line is a tripping hazard and can harm small wildlife if left outside. Take a moment to inspect the spool and trimmer head housing for any cracks or damage – if you notice any wear, replace the entire head before installing new line to avoid future issues.

Step 3: Measure and Cut the New Line

The length of line you need depends on your trimmer head design. For most Kobalt Brushless bump feed heads, you’ll need two equal segments of line, each 8 to 10 feet long. For automatic feed heads, you’ll need a single continuous piece of line, usually 12 to 15 feet long. Check your owner’s manual for the exact recommended length for your specific model, as using too much line can cause jams, and too little will mean you have to re-string the tool frequently. (See Also:Why Is My Ryobi Weed Eater Smoking)

Once you’ve measured the correct length, use your sharp scissors or line cutter to cut the line. Cut straight across to create clean, even edges – jagged cuts can cause the line to jam in the feed mechanism or fall out of the head mid-use. If you’re cutting two segments for a bump feed head, make sure they are exactly the same length to ensure even feeding when you bump the head. Uneven line lengths will cause the weed eater to pull to one side while you’re working.

Step 4: Load the Line Into the Trimmer Head

This step varies slightly depending on your feed system, so follow the instructions for your specific head type. For bump feed heads: Take one of your cut line segments and insert one end into the small hole on the edge of the spool. Wind the line clockwise around the spool, keeping it tight and evenly spaced as you go. Leave about 6 inches of line hanging out of the hole when you’re done winding. Repeat this process with the second line segment on the opposite side of the spool, making sure both segments are wound tightly and evenly.

For automatic feed heads: Take your single continuous piece of line and insert one end into the small hole at the center of the spool. Wind the line clockwise around the spool, keeping it tight and making sure the line doesn’t overlap itself. Leave about 12 inches of line hanging out of the feed outlet on the side of the head once you’re done winding.

Important note: Always wind the line clockwise for all Kobalt Brushless models. Winding it counterclockwise will cause the line to unwind as soon as you start the tool, leading to a messy, unusable setup. If you’re ever unsure of the direction, look for a small arrow printed on the spool itself – it will point in the correct winding direction.

Step 5: Reassemble and Test the Weed Eater

Once the line is loaded onto the spool, insert the spool back into the trimmer head housing, making sure it clicks into place. For bump feed heads, reattach the head to the weed eater by twisting it clockwise until it locks into the drive shaft. For automatic feed heads, twist the head clockwise until it’s fully seated on the shaft – you should feel a small click when it’s locked in place.

Reconnect the battery pack, put on your safety glasses, and test the tool. For bump feed heads, turn on the weed eater and tap the bottom of the head against the ground 2 to 3 times – you should see 4 to 6 inches of line extend from both sides of the head. For automatic feed heads, turn on the tool and rev the motor – the line should extend automatically as you work. If the line doesn’t extend, or if it feeds unevenly, check that you wound the line tightly and in the correct direction, and that the spool is seated properly in the head.

Bump Feed vs. Automatic Feed Systems: What’s the Difference?

One of the most common questions new Kobalt Brushless weed eater owners have is which feed system their model uses, and which is better for their needs. While both systems are designed for easy line replacement, they have key differences that affect performance and ease of use. The comparison table below breaks down the core features of each system to help you understand which one you have and how to care for it.

Regardless of which system you have, the line replacement process is almost identical, with the only difference being how you test the line after installation. Bump feed systems are ideal for casual homeowners who do light yard work, while automatic feed systems are better for users who need to clear large areas quickly without stopping to bump the head. If you’re still unsure which system your Kobalt Brushless model uses, consult your owner’s manual or check the product listing on Kobalt’s website.

Choosing the Right Replacement Line for Your Kobalt Brushless Weed Eater

Using the wrong trimmer line is one of the most common causes of poor performance, jams, and even damage to your weed eater’s motor. When researching how to string a Kobalt Brushless Weed Eater? many users overlook the importance of using the correct line size, leading to avoidable performance issues. Kobalt Brushless models are designed to work with specific line diameters and materials, so it’s important to choose the right replacement line for your specific model. Most Kobalt Brushless weed eaters use round or square trimmer line, with diameters ranging from 0.065 inches to 0.095 inches.

Thinner line (0.065″) is best for light grass and weeds, as it cuts cleanly and feeds smoothly through bump feed heads. Thicker line (0.080″ to 0.095″) is better for thick weeds, brush, and edging along hard surfaces, as it’s more durable and can handle more stress. Always check your owner’s manual for the exact line size recommended for your specific model, as using a line that’s too thick can overload the brushless motor, and line that’s too thin will break frequently even with light use. (See Also:How To Use The Worx Weed Eater)

In addition to size, pay attention to line material. Avoid cheap, generic trimmer line made from low-grade plastic, as it tends to be brittle and break easily, leading to more frequent replacements. Kobalt’s OEM replacement line is designed specifically for their brushless models, so it’s the best choice for optimal performance and longevity. If you have an automatic feed system, you’ll need to use the exact line size specified by the manufacturer, as the feed mechanism is calibrated for that specific diameter to prevent jams.

Tips for Extending Trimmer Line Life

Proper maintenance and care will extend the life of your trimmer line, saving you time and money on frequent replacements. Follow these tips to get the most out of your line:

• Store line and your weed eater in a cool, dry place: UV exposure and high heat can make trimmer line brittle and prone to breaking. Keep your tool and replacement line out of direct sunlight, and avoid storing it in a hot garage or shed during the summer months.
• Wipe the line down after each use: Grass, dirt, and moisture can cause corrosion and weaken the line over time. Use a dry rag to wipe the line and trimmer head clean after each use to remove debris.
• Use gentle taps for bump feed heads: A light tap on the ground is all that’s needed to release more line. Rough, hard taps will wear the line down faster and can damage the bump mechanism inside the head.
• Avoid cutting thick, woody material: Trimmer line is designed for grass and weeds, not thick brush or tree limbs. Use a hedge trimmer or pruning saw for woody material to avoid breaking your line prematurely.
• Rotate the spool periodically: If you notice the line is wearing unevenly on one side, remove the spool and rotate it 180 degrees before reinserting it. This distributes wear evenly and doubles the life of the line.
• Use a line conditioner occasionally: Spraying a small amount of line conditioner on the line before installation reduces friction as it feeds through the head, making it last longer and feed more smoothly, especially for automatic feed systems.

Common Mistakes to Avoid When Stringing Your Weed Eater

Even experienced users make mistakes when stringing a weed eater, but avoiding these common errors will save you time, frustration, and wasted line:

1. Winding the line in the wrong direction: This is the most common mistake new users make. Winding the line counterclockwise will cause it to unravel as soon as you start the tool, leading to tangled line, poor cutting performance, and frequent jams. Always wind clockwise for Kobalt Brushless models, and double-check the direction on the spool before you start winding.
2. Using the incorrect line size: As mentioned earlier, using line that’s too thick or too thin will cause feeding issues and poor performance. Always check your owner’s manual for the recommended diameter before buying replacement line, and avoid using generic line that isn’t designed for your model.
3. Overfilling the spool: It’s tempting to wind as much line as possible onto the spool to avoid frequent replacements, but overfilling will cause the line to overlap and jam the feed mechanism. Follow the recommended length for your model, and leave a small gap at the end of the spool to allow the line to move freely.
4. Skipping safety precautions: Never attempt to string the weed eater while the battery is connected, even if you’re just testing the fit of the line. An accidental trigger press can cause the line to spin at high speeds, leading to serious cuts or eye injuries. Always disconnect the battery before starting any work.
5. Not securing the line properly: When inserting the line into the spool hole, make sure it’s pushed all the way in so it doesn’t slip out while you’re winding. If the line slips out, you’ll have to start the winding process over, wasting time and line. A small drop of hot glue on the end of the line (if your spool has a small groove for it) can help hold it in place while you wind.

Troubleshooting Common Post-Installation Issues

If you’ve followed all the steps correctly but are still having issues with your newly strung weed eater, use this guide to troubleshoot common problems:

• Line won’t extend when bumping (bump feed models): First, check that you wound the line tightly and in the correct clockwise direction. Loose line will not feed properly. Next, make sure the spool is seated correctly in the trimmer head housing – if it’s misaligned, the feed mechanism won’t engage. Finally, check that the line isn’t tangled inside the head – remove the spool and unwind the line to check for tangles.
• Line feeds unevenly (bump feed models): This is almost always caused by uneven winding of the line on the spool. Remove the spool and rewind the line, making sure it’s evenly spaced and both segments are the same length. If the problem persists, check that the spool isn’t cracked or damaged – a damaged spool will cause uneven feeding and will need to be replaced.
• Automatic feed system won’t extend line: First, make sure the battery is fully charged – low power can cause the feed motor to not engage. Next, check that the line is wound tightly and that the end of the line is sticking out of the feed outlet by at least 6 inches. If the line is too short, the feed mechanism won’t grab it. Finally, check for debris in the feed outlet – clear any grass or dirt that might be blocking the line from extending.
• Line breaks frequently after installation: This is usually caused by using low-quality line, or line that’s the wrong size for your model. It can also be caused by overfilling the spool, which puts too much tension on the line. Try using OEM Kobalt replacement line, and make sure you’re following the recommended line length for your model. If the problem persists, check that the trimmer head isn’t damaged, as a cracked housing can cause the line to catch and break.

Frequently Asked Questions

How Often Should I Replace the Line on My Kobalt Brushless Weed Eater?

The frequency of line replacement depends on how often you use the tool and the type of terrain you’re working on. For light residential use (trimming grass around sidewalks and flower beds once a week), you’ll need to replace the line every 2 to 3 months. For heavier use (clearing thick weeds, edging along driveways, or commercial use), you may need to replace the line every 2 to 4 weeks. You’ll know it’s time to replace the line when you notice the cutting width of the weed eater has decreased, or when the line breaks frequently even with light use. Regularly inspecting the line before each use will help you catch wear early and avoid mid-job interruptions.

What Size Line Does My Kobalt Brushless Weed Eater Use?

Most Kobalt Brushless weed eaters use trimmer line with a diameter between 0.065 inches and 0.095 inches, depending on the model. Entry-level 20V and 40V models typically use 0.065″ or 0.080″ line, while higher-torque 80V models use 0.080″ or 0.095″ line for heavy-duty cutting. The exact recommended line size is listed in your owner’s manual, and is also printed on a sticker on the side of the trimmer head. Using the wrong line size can cause poor performance, jams, and even damage to the brushless motor, so always verify the correct size before buying replacement line.

Which Direction Do I Wind the Line on a Kobalt Brushless Weed Eater?

For all Kobalt Brushless weed eater models, you should always wind the trimmer line clockwise around the spool. Winding the line counterclockwise will cause it to unravel as soon as you start the tool, leading to tangled line, poor cutting performance, and frequent jams. If you’re ever unsure of the direction, look for a small arrow printed on the spool itself – it will point in the correct winding direction. For bump feed heads with two line segments, wind each segment clockwise on its respective side of the spool. (See Also:How To Clean Ryobi Weed Eater Carburetor)

Why Does My Trimmer Line Keep Falling Out After Installation?

There are a few common reasons for this issue. First, you may not have inserted the line far enough into the spool hole – make sure the end of the line is pushed all the way into the hole so it doesn’t slip out while you’re winding. Second, you may have wound the line too loosely – loose line will slip out of the spool as soon as you start the tool. Always wind the line tightly and evenly around the spool. Third, the spool itself may be damaged or cracked – if the spool is worn, it won’t hold the line in place properly, and you’ll need to replace the entire trimmer head.

Does the Brushless Motor Affect How I String the Weed Eater?

No, the brushless motor does not change the line replacement process for Kobalt weed eaters. The line replacement steps are identical for both brushed and brushless models of the same trimmer head design. The only difference is that brushless motors produce less vibration and have a longer runtime than brushed motors, so you’ll likely go through trimmer line more slowly over time, meaning fewer replacements. The brushless motor also provides more consistent power, so the line will feed more smoothly once it’s installed correctly.

Conclusion

Learning how to string a Kobalt Brushless Weed Eater? is a simple, essential skill that every owner should master to get the most out of their tool. This guide has walked you through every step of the process, from gathering your tools and taking critical safety precautions to installing new line, troubleshooting common issues, and extending the life of your trimmer line. Remember to always wind the line clockwise, use the correct line size for your specific model, and follow safety protocols to avoid injuries.

With these tips, you’ll be able to replace your trimmer line in 10 minutes or less, and keep your Kobalt Brushless weed eater running at peak performance for years to come. Whether you’re a casual homeowner tackling weekend yard work or a professional landscaper managing large properties, proper line maintenance is the key to avoiding mid-job interruptions and getting consistent, clean cuts every time. Don’t let a broken line stop you from finishing your yard work – with this guide, you’ll have the knowledge to handle the task quickly and easily every time.