How to String Dewalt Battery Weed Eater? FlexVolt Tips

Introduction

If you’ve been searching for how to string Dewalt battery weed eater, you’ve come to the right place. Dewalt’s FlexVolt line of battery-powered outdoor equipment has become a favorite for DIYers and professional landscapers alike, thanks to their cordless convenience, long battery life, and powerful performance. But like any string trimmer, the cutting line will wear down over time, and when it does, you need to restring the head. A lot of users assume restringing a battery-powered model is more complicated than a gas one, but it’s actually straightforward once you know the process, especially if you follow the FlexVolt-specific tips that make the job even easier. This guide will walk you through every step of the process, from prepping your tools to testing the newly strung trimmer, plus best practices, common mistakes to avoid, and answers to frequently asked questions.

• Understanding Your Dewalt FlexVolt Weed Eater Head
• Tools and Materials You’ll Need
• Safety Precautions Before Starting
• Step-by-Step Guide to Stringing Your Dewalt Battery Weed Eater
• FlexVolt-Specific Tips for Easier Restringing
• Choosing the Right Replacement String
• Maintenance Tips to Extend String Life
• Common Mistakes to Avoid
• Troubleshooting Common Restringing Issues
• Frequently Asked Questions
• Conclusion

Understanding Your Dewalt FlexVolt Weed Eater Head

Dewalt FlexVolt weed eaters come with two main types of cutting heads, and knowing which type you have will make restringing much easier. The most common is the bump feed head, standard on most residential FlexVolt models. This head releases a set length of line when you tap the bottom of the head on the ground, and it’s very simple to restring, taking most users 2 to 3 minutes. The second type is the automatic feed head, which is standard on commercial-grade FlexVolt models. This head feeds line automatically as you trim, no tapping required, but restringing it is slightly more involved, as you need to wind the line more precisely to avoid jams.

The FlexVolt battery does not affect the head’s core mechanism, but the consistent power delivery of FlexVolt technology makes the feed mechanism smoother and more reliable than standard battery-powered trimmers, especially when cutting thick vegetation. Below is a comparison of the two head types to help you identify which one you have:

Tools and Materials You’ll Need

You don’t need any special tools to restring most Dewalt FlexVolt weed eaters – just these basic items:

• Replacement weed eater string of the correct diameter for your model (check your user manual for the recommended size)
• Scissors or a dedicated line cutter
• Work gloves
• Clean, dry rag
• Small flathead screwdriver (optional, for stuck spools)
• Small brush or paperclip (optional, for clearing debris from feed slots)

All of these items are inexpensive and available at any local hardware store or home improvement center.

Safety Precautions Before Starting

Weed eaters are powerful tools with sharp rotating lines, so taking a few simple safety steps will prevent injury while you restring your Dewalt battery weed eater:

• Always remove the FlexVolt battery from the trimmer before working on the head. Even if the trimmer is turned off, accidental trigger activation can cause the line to spin at high speed, leading to serious cuts or eye injuries.
• Wear work gloves to protect your hands from sharp string ends, and safety glasses to guard against debris that may fly out of the head.
• If you just used the trimmer, wait for the head to cool down before touching it – the motor and spool can get very hot during use.
• Clear the area of tripping hazards, and keep pets and children away while you work.
• Dispose of old string properly – cut it into small pieces first to avoid accidental entanglement.

Step-by-Step Guide to Stringing Your Dewalt Battery Weed Eater

Restringing your Dewalt battery weed eater takes just 2 to 5 minutes once you get the hang of it. Follow these steps for a smooth, trouble-free process:

Removing the Old Spool and String

1. Detach the FlexVolt battery from the weed eater and set it aside in a safe, dry location. Never work on the trimmer head with the battery installed, as accidental trigger activation can cause serious injury.
2. Locate the spool release tab, a small plastic lever on the bottom or side of the head housing (consult your user manual if you can’t find it).
3. Press and hold the release tab firmly, then rotate the spool counterclockwise until you feel a click, indicating the locking tabs have disengaged.
4. Pull the spool straight out of the head housing. If it’s stuck, use a small flathead screwdriver to gently pry the release tab further, but take care not to break the plastic tab.
5. Pull out any remaining old string and dispose of it properly. Wipe out the inside of the head housing with a dry rag to remove grass clippings or debris that could cause jams.

Preparing the New Replacement String

1. Confirm the correct string diameter for your model in your user manual – most residential FlexVolt trimmers use .065″ line, while heavier-duty models use .080″.
2. Cut two equal lengths of string, each 10 to 12 feet long (use 15 feet per side for larger heads).
3. Find the midpoint of the string, then fold it in half to create a small loop at one end and two loose ends at the other. This loop will lock into the spool’s center slot to prevent slipping while winding.

Loading the New String Into the Spool

1. Insert the folded string’s loop into the small slot in the center of the spool, making sure it is seated all the way in so it doesn’t pull out while winding.
2. Wind one loose end around the spool in a clockwise direction, ensuring the string lies flat and does not cross over itself.
3. Wind the other loose end around the opposite side of the spool in a counterclockwise direction. This opposite winding is critical to prevent tangles and jams.
4. Wind each end until 4 to 6 inches of string remains, then tuck the loose ends into the small feed slots on the sides of the spool. Pull the ends tight to keep them from slipping back into the spool.

Reinstalling the Spool and Testing

1. Align the spool with the slots in the head housing, making sure the string ends line up with the feed holes.
2. Push the spool straight into the housing until you hear a click, meaning it is seated correctly and the locking tabs are engaged.
3. Pull gently on each string end to confirm it feeds freely through the head without catching.
4. Reattach the FlexVolt battery, then test the feed by tapping the head on the ground while squeezing the trigger gently. 5 to 6 inches of line should extend from each side. If it doesn’t feed, double-check the spool seating and string slot alignment.

FlexVolt-Specific Tips for Easier Restringing

Dewalt’s FlexVolt battery technology offers unique advantages that make restringing your weed eater easier and more efficient:

• Use consistent power for smooth winding: The steady voltage delivery of FlexVolt batteries means you won’t have to worry about the line slipping while you wind it, even if you’re testing the feed mid-process.
• Take advantage of long runtime: FlexVolt batteries last up to 3 times longer than standard 20V MAX batteries, so you can take your time restringing and testing the trimmer without worrying about the battery dying mid-job.
• Use low speed for testing: If your model has a variable speed trigger, use the low setting when testing the line feed after restringing. The smooth power delivery of FlexVolt batteries prevents sudden speed bursts that can over-extend or break the new line.
• Cold-weather reliability: FlexVolt batteries are rated to operate in temperatures as low as -20°F, so you can restring and use your trimmer in cooler weather without the feed mechanism seizing up, a common issue with lower-quality battery trimmers.
• Use quick-load spools if available: Newer FlexVolt weed eater models offer pre-wound quick-load spools that pop directly into the head, eliminating the need to wind line yourself and cutting restringing time to under a minute.

Choosing the Right Replacement String

Using the correct string is critical for your trimmer’s performance and longevity, even with the power of FlexVolt batteries. First, check your user manual for the recommended string diameter for your model: .065″ is standard for light residential use, while .080″ is better for thick weeds and larger properties. Never use a thicker string than specified, as it will overload the motor and reduce battery runtime.

For material, round nylon line is the standard, all-purpose option. If you regularly cut thick, woody brush, serrated or square-edged line cuts more aggressively, but wears out faster. Dewalt’s branded replacement string is optimized for their FlexVolt models, but high-quality third-party line of the correct size works just as well for most users.

Maintenance Tips to Extend String Life

Proper maintenance will reduce how often you need to restring your Dewalt battery weed eater and keep your trimmer running smoothly:

• Replace the line when it wears down to 2–3 inches. Running the trimmer with very short line puts extra strain on the motor and increases breakage risk.
• Wipe the line and spool down with a dry rag after each use to remove grass clippings, dirt, and moisture that can cause corrosion or clog feed slots.
• Store the trimmer in a cool, dry place out of direct sunlight. Extreme heat makes nylon line brittle, leading to frequent breaks.
• Avoid hitting rocks, concrete, or wooden edging with the line, as this wears it out extremely quickly and can damage the spool.
• Use the appropriate speed setting for the job: low speed for light grass, higher speed for thick brush. Running at full speed unnecessarily wears out the line faster, even with FlexVolt power.

Common Mistakes to Avoid

Avoiding these common errors will make restringing your Dewalt battery weed eater faster and reduce the risk of jams or damage:

1. Winding both string ends in the same direction: This is the most common cause of tangles and feed jams. Always wind one end clockwise and the other counterclockwise around the spool.
2. Using string that’s too thick: Even with the high torque of FlexVolt batteries, oversized string overloads the motor, reduces battery runtime, and can damage the spool or head housing. Always use the diameter recommended in your user manual.
3. Not leaving enough line exposed: You need at least 4 inches of line hanging out of the feed slots for it to catch when you tap the head. Too little line will result in no feed, while too much can cause tangles.
4. Forcing the spool into the head: If the spool doesn’t slide in easily, it’s misaligned or blocked by debris. Forcing it will break the plastic release tab, requiring a full head replacement.
5. Skipping battery removal: Never work on the trimmer head with the battery installed. Accidental trigger activation can cause the line to spin at high speed, leading to serious cuts or eye injuries.

Troubleshooting Common Restringing Issues

Even when you follow all steps correctly, you may encounter minor issues when restringing your Dewalt battery weed eater. Here are the most common problems and their quick fixes:

• Line won’t feed after restringing: First, confirm you wound the two string ends in opposite directions – same-direction winding causes tangles. Next, ensure 4–6 inches of line hangs out of the feed slots, and clear any grass or debris clogging the feed holes. Finally, make sure the spool is fully seated in the head housing until it clicks.
• Line jams frequently while trimming: This is almost always caused by uneven winding on the spool. Unwind the line and rewind it neatly, making sure it lies flat and does not cross over itself. Also confirm you are using the correct string diameter for your model.
• Line breaks often during use: Check that you are not hitting rocks, concrete, or wooden edging with the line, as this causes rapid wear. Also confirm the string is the recommended size – too thick a string will break easily under the strain of the FlexVolt motor.
• Spool won’t click into place: Make sure the loose string ends are not stuck in the release tab slot, and clear any debris from the head housing that may be blocking the spool from seating fully. Never force the spool in, as this can break the locking tabs.

Frequently Asked Questions

How often do I need to string my Dewalt battery weed eater?

The frequency depends on your usage and the vegetation you’re cutting. For casual residential use, trimming light grass once a week, you’ll need to restring every 2 to 3 months. If you cut thick weeds, brush, or woody growth, you may need to restring every 2 to 4 weeks. You’ll know it’s time to restring when the line wears down to 2 to 3 inches, or when the trimmer struggles to cut through vegetation it usually handles easily.

Can I use third-party string in my Dewalt FlexVolt weed eater?

Yes, as long as the third-party string matches the diameter and material specifications for your model, listed in your user manual. Most FlexVolt models use .065″ or .080″ round nylon line, and high-quality third-party options of that size work just as well as Dewalt’s branded string. Avoid cheap, low-quality line, as it breaks easily and causes jams.

Why won’t my line feed after restringing?

The most common causes are: 1) you wound both string ends in the same direction, causing tangles, 2) there is less than 4 inches of line hanging out of the feed slots, 3) the feed slots are clogged with grass or debris, or 4) the spool is not fully seated in the head housing. To fix this, remove the spool, check the winding direction, ensure enough line is exposed, clear any clogs, and reseat the spool until it clicks.

Do I need special tools to string my Dewalt battery weed eater?

No, you only need basic, inexpensive tools: replacement string of the correct size, scissors or a line cutter, work gloves, a dry rag, and optionally a small flathead screwdriver for stuck spools. No Dewalt-specific tools are required for most models.

Is it okay to use a thicker string for better cutting power?

No. Always use the string diameter recommended by Dewalt for your model. Thicker string overloads the motor, reduces battery runtime, and can damage the spool or head housing, even with the high torque of FlexVolt batteries. If you need more cutting power for thick brush, upgrade to a model designed for larger, thicker string rather than modifying your current trimmer.

Can I restring my Dewalt FlexVolt weed eater while the battery is attached?

Never. Always remove the battery before working on the trimmer head. Accidental trigger activation can cause the line to spin at high speed, leading to serious cuts, eye injuries, or damage to the head. Removing the battery ensures the trimmer is completely powered off and safe to work on.

Conclusion

Restringing your Dewalt battery weed eater is a simple, quick task that saves you money on professional servicing and keeps your yard looking neat. By following the step-by-step guide in this article, using the correct string size, and applying the FlexVolt-specific tips shared here, you can restring your trimmer in just a few minutes without hassle. Remember to always remove the battery before starting work, avoid common mistakes like same-direction winding, and perform regular maintenance to extend the life of your line and tool. Whether you’re a first-time Dewalt user or a seasoned landscaper, mastering how to string your Dewalt battery weed eater will make yard maintenance faster and easier for years to come.