How to Wind Black and Decker Weed Eater? Easy Guide to Refill Trimmer Line

Introduction

There’s nothing more frustrating than having your weed eater line snap halfway through edging your lawn or clearing overgrown weeds, especially if you’re in the middle of a project and don’t have a replacement spool on hand. Black & Decker is one of the most popular brands of residential and light commercial weed eaters, known for their durability and ease of use, but even the best models require regular line maintenance to perform at their best. If you’ve ever asked yourself, How to Wind Black and Decker Weed Eater? you’re not alone: many homeowners assume rewinding trimmer line is a complicated, expensive task that requires a trip to the hardware store or a professional repair, but the process is simple, quick, and only takes a few minutes once you know the steps. This comprehensive guide will walk you through every part of the process, from identifying the right line for your model to troubleshooting common issues, so you can get back to yard work in no time. We’ll cover step-by-step instructions, best practices for line longevity, common mistakes to avoid, and answer frequently asked questions to ensure you never have to deal with a broken weed eater line again.

• Understanding Your Black & Decker Weed Eater Line System
• Types of Trimmer Lines for Black & Decker
• Single-Line vs. Dual-Line Spools
• Tools and Materials You’ll Need
• Step-by-Step Guide: How to Wind Black and Decker Weed Eater
• Step 1: Prepare Your Workspace and Gather Supplies
• Step 2: Remove the Old Spool or Broken Line
• Step 3: Measure and Cut the New Trimmer Line
• Step 4: Wind the Line Onto the Spool Correctly
• Step 5: Reassemble the Weed Eater Head
• Step 6: Test the Line for Proper Function
• Tips for Proper Line Winding and Longevity
• Common Mistakes to Avoid When Winding Your Line
• Comparison of Popular Black & Decker Weed Eater Models and Line Requirements
• Troubleshooting Common Line Issues
• Frequently Asked Questions

Understanding Your Black & Decker Weed Eater Line System

All Black & Decker weed eaters use a spool-based line feeding system designed for easy, consistent cutting performance. The trimmer line is wound around a small plastic spool housed inside the cutting head at the bottom of the unit. As you trim, the line wears down from contact with weeds, grass, and hard surfaces, and the automatic feed system pushes new line out from the spool to maintain the optimal cutting length. When the line is completely used up, breaks, or becomes too short to feed properly, you can rewind the existing spool with new line rather than replacing the entire cutting head, which saves significant money over time. While spool designs vary slightly between Black & Decker models, the core winding process is nearly identical across all units, so mastering the general steps will work for almost every model on the market.

Types of Trimmer Lines for Black & Decker

Trimmer line comes in three primary cross-sectional shapes, each designed for different cutting tasks, and most Black & Decker models are compatible with all types as long as the line diameter matches the manufacturer’s recommendation:

• Round line: The most common and affordable option, round line has a smooth, circular cross-section. It’s ideal for general-purpose trimming of soft grass, light weeds, and edging along sidewalks and driveways. It’s less durable than other types, but works well for most residential yard care needs.
• Square line: Square line has sharp, flat edges that cut through thicker weeds, dense grass, and small woody stems more efficiently than round line. It’s more durable and lasts longer, making it a good choice for yards with heavy overgrowth or tougher vegetation.
• Serrated line: Serrated line has small teeth along its edges, which act like a saw to cut through thick, woody weeds, brush, and overgrown vegetation. It’s the most durable option, but can be harder on the weed eater motor if used for light trimming tasks.

Black & Decker specifies a recommended line diameter for each model, usually printed on the side of the cutting head or listed in the owner’s manual. Most residential lightweight models use 0.065-inch line, while heavier-duty models use 0.080-inch line. Using a line that’s too thick will strain the motor and reduce cutting performance, while a line that’s too thin will break frequently and wear down quickly.

Single-Line vs. Dual-Line Spools

Black & Decker weed eaters use either single-line or dual-line spools, and the winding process varies slightly depending on which type your model has. Single-line spools, used in most residential Black & Decker models like the LST series, hold one continuous piece of line, making them much easier to wind and far less prone to tangling. They’re ideal for most homeowners, as they require minimal effort to maintain and work well for general yard care tasks.

Dual-line spools, used in some commercial-grade Black & Decker models like the STB series, hold two separate pieces of line that rotate in opposite directions to cut more efficiently and clear debris faster. While they deliver better performance for heavy-duty tasks, they’re more complicated to wind, as you need to align both lines correctly in the feed holes and wind each line in the opposite direction to avoid tangling. For most residential users, a single-line model is more than sufficient, and the winding process is far simpler.

Tools and Materials You’ll Need

One of the biggest benefits of rewinding your Black & Decker weed eater line yourself is that you don’t need any specialized tools or expensive equipment. All the supplies you need are inexpensive and easy to find at any hardware store or garden center:

• New trimmer line: Purchase line that matches the recommended diameter for your specific model. A 50-foot roll of 0.065-inch line costs $5-$8, and will last for 5-10 rewinds depending on use.
• Sharp scissors or line cutter: You’ll use this to cut the new line to the correct length. Heavy-duty garden shears work especially well, as they make clean, straight cuts that don’t fray.
• Flathead screwdriver (optional): Some older Black & Decker models have a small screw securing the spool cap, so a screwdriver may be required to remove it. Check your model’s design before starting.
• Work gloves: New trimmer line is extremely sharp, and even a small slip can cause deep cuts to your fingers. Gloves also protect your hands from scrapes and debris inside the cutting head.
• Small brush or old rag: You’ll use this to clean out grass clippings, dirt, and debris from the cutting head before reassembling, which prevents jams and premature wear.

Compared to buying a pre-wound replacement spool for $15-$30, or a whole new cutting head for $40+, rewinding your line costs less than $1 per use, making it a far more cost-effective option for regular maintenance.

Step-by-Step Guide: How to Wind Black and Decker Weed Eater

Once you have your supplies gathered, the entire winding process takes 5-10 minutes, even for first-time users. Follow these steps carefully to avoid tangles and jams, and ensure your line feeds smoothly when you’re ready to trim.

Step 1: Prepare Your Workspace and Gather Supplies

Prepping your workspace first will make the process faster and avoid mess. Lay down a tarp or old newspaper on your work surface to catch any grass clippings or debris that falls out of the cutting head. Put on your work gloves to protect your hands from sharp line and debris. If you have an electric Black & Decker weed eater, unplug it from the outlet; if you have a cordless model, remove the battery pack entirely to avoid accidental startup while you’re working. Gather your new line, cutter, and brush so you don’t have to stop mid-process to look for supplies.

Step 2: Remove the Old Spool or Broken Line

First, you need to remove the old spool or any remaining broken line from the cutting head. Most modern Black & Decker models have a twist-off spool cap on the bottom of the cutting head: twist the cap counterclockwise until it loosens, then pull it free. Some models have a small release button instead: press the button and pull the cap off. Once the cap is removed, pull the old spool out of the head, and discard any remaining line wrapped around the spool shaft.

Take this opportunity to clean the inside of the cutting head thoroughly with your small brush or rag. Built-up grass clippings, dirt, and debris are one of the most common causes of line jams and uneven feeding, so this step is critical for long-term performance. If your model uses a fixed, non-removable spool, you’ll simply pull out any remaining broken line and clean the head before winding new line directly onto the fixed spool.

Step 3: Measure and Cut the New Trimmer Line

Cutting the line to the correct length is key to avoiding tangles and overfilling the spool. Most Black & Decker spools hold between 10 and 15 feet of line, depending on the model and line diameter. A simple way to measure the correct length is to wrap the line around the empty spool 8 to 12 times, then add 6 extra inches for the ends that will stick out of the feed holes. Once you’ve measured the correct length, use your scissors or line cutter to cut the line, making sure the cut is clean and straight to avoid fraying. Frayed ends can catch on the spool and cause tangles, so if your cut is ragged, trim it again until it’s smooth.

Step 4: Wind the Line Onto the Spool Correctly

This is the most important step in the process, and doing it correctly will prevent almost all common line issues. First, check the side of the spool or the cutting head for a small printed arrow – this arrow indicates the correct direction to wind the line, and winding in the wrong direction is the most common cause of jams and feeding problems. Hold the spool in one hand, and the end of the line in the other, then start winding the line around the spool in the direction the arrow points.

Keep the line tight and evenly spaced as you wind: don’t let it overlap or bunch up, as this will cause tangles when the line feeds out. Wind the line until you have 6 to 8 inches of line left sticking out from the spool – this extra length will be threaded through the feed holes in the cutting head. For dual-line spools, you’ll need to wind two separate pieces of line, each in opposite directions, leaving 6-8 inches of each line sticking out, aligned with the two feed holes in the head. Avoid winding the line so tight that it deforms the plastic spool, but don’t leave it loose either – a firm, even wind is ideal for smooth feeding.

Step 5: Reassemble the Weed Eater Head

Once the line is wound correctly, you need to thread the line ends through the feed holes in the cutting head. For single-line spools, take the two ends of the line sticking out of the spool, and thread each end through one of the small feed holes on the side of the cutting head, pulling them through until they’re even on both sides. For dual-line spools, thread each line end through its corresponding feed hole, making sure the lines don’t cross or tangle.

Once the lines are threaded, snap the spool back into place inside the cutting head, making sure it seats fully in the groove to avoid wobbling. Then, replace the spool cap: twist it clockwise until it clicks into place, or if your model uses a screw, tighten it gently with your screwdriver. Don’t overtighten the cap, as this can crack the plastic. Make sure the cap is secure so the spool doesn’t fall out while you’re trimming.

Step 6: Test the Line for Proper Function

Now it’s time to test that the line is wound correctly and feeds smoothly. Reinsert the battery (for cordless models) or plug the weed eater back in (for electric models). Hold the weed eater away from your body and any obstacles, then pull the trigger to activate the cutting head. Watch as the line feeds out: it should extend evenly from both sides of the head, with no tangling or jerking.

If the line doesn’t feed out, check that you wound it in the correct direction, that the ends are threaded through the feed holes properly, and that the spool is seated fully in the head. If the line feeds out unevenly, unwind the spool and rewind it more tightly, making sure the line is evenly spaced with no gaps or overlaps. Once the line feeds correctly, you’re ready to use your weed eater for yard work.

Tips for Proper Line Winding and Longevity

Following these simple tips will help your trimmer line last longer, reduce how often you need to rewind it, and keep your weed eater running smoothly for years:

• Use the correct line diameter for your model: Using a line that’s too thick will strain the motor and cause poor cutting performance, while a line that’s too thin will break frequently. Always check your owner’s manual for the recommended diameter for your specific unit.
• Don’t overfill the spool: Leave a small 1/8-inch gap between the wound line and the edge of the spool. Overfilling causes the line to bunch up and tangle, leading to jams and uneven feeding.
• Wind the line tightly and evenly: Loose winding is the top cause of line tangles, so take the extra few seconds to keep the line taut as you wind, and avoid overlapping layers.
• Clean the cutting head every time you rewind: Grass clippings, dirt, and debris build up inside the head over time, which can jam the line and cause premature wear on the spool. A 30-second brush-out each time you rewind will extend the life of your weed eater.
• Store extra line in a cool, dry place: Trimmer line becomes brittle if exposed to direct sunlight or extreme temperatures, so keep unused line in a sealed plastic bag in a garage or shed to maintain its flexibility and durability.
• Replace the line before it gets too short: If your line is shorter than 2-3 inches, it’s more likely to break or wrap around the spool shaft, so rewind it before it reaches that length.

Common Mistakes to Avoid When Winding Your Line

Even experienced DIYers make these common mistakes, which lead to jams, broken line, and even permanent damage to the weed eater. Avoid these errors to make the winding process as smooth as possible:

• Winding in the wrong direction: This is the most frequent mistake, and it will cause the line to jam and not feed out at all. Always check for the winding direction arrow on the spool or head, and wind in that direction. If you’re unsure, wind in the direction that pulls the line out smoothly when you activate the trimmer (usually clockwise for most Black & Decker models).
• Overfilling the spool: It’s tempting to add as much line as possible to avoid rewinding often, but overfilling causes the line to overlap and tangle, leading to jams and uneven cutting. Stop winding when the line is level with the edge of the spool, leaving a small gap.
• Using the wrong line diameter: Using a line that’s too thick or too thin will cause poor performance, frequent breakage, and even motor damage. Always use the diameter recommended for your specific model.
• Skipping the head cleaning step: Failing to clean out debris from the cutting head before reassembling will cause jams, even if you wind the line perfectly. Take 30 seconds to brush out any grass or dirt before putting the spool back in.
• Not leaving enough line sticking out when winding: If you don’t leave 6-8 inches of line sticking out of the spool, you won’t have enough to thread through the feed holes, and you’ll have to unwind the entire spool and start over.

Comparison of Popular Black & Decker Weed Eater Models and Line Requirements

Different Black & Decker models have different line requirements, so use this table to find the right line and spool capacity for your unit to ensure optimal performance:

If you don’t see your model listed, check the label on the side of the cutting head or your owner’s manual for the exact line requirements, as Black & Decker occasionally updates model specifications.

Troubleshooting Common Line Issues

Even if you follow all the steps correctly, you may run into occasional issues with your line. Here’s how to fix the most common problems:

• Line won’t feed out when I pull the trigger: First, confirm you wound the line in the correct direction by checking for the arrow on the spool. Next, make sure the line ends are threaded fully through the feed holes in the cutting head, and that the spool is seated completely in the head groove. If the line is wound too tight, it may be stuck, so unwind it slightly and rewind it with a little less tension.
• Line is tangling inside the cutting head: This is almost always caused by overfilling the spool or winding the line too loosely. Remove the spool, unwind all the line, and rewind it more tightly, making sure not to overfill the spool. Also check that there’s no debris caught between the line layers.
• Line breaks frequently while trimming: First, verify you’re using the correct line diameter for your model. Next, make sure you’re not hitting rocks, concrete, or other hard objects while trimming, as this will dull and break the line quickly. If the line is dull, replace it with a new piece – dull line cuts less efficiently and puts extra strain on the motor.
• Motor is straining or shutting off while trimming: This is usually caused by using a line that’s too thick for your model, overfilling the spool, or having debris jammed in the cutting head. Check the line diameter, remove the spool and clean out any debris, and make sure the spool isn’t overfilled.

Frequently Asked Questions

How often should I replace my Black & Decker weed eater line?

The frequency of line replacement depends on how often you use your weed eater and the type of vegetation you’re cutting. If you use your trimmer weekly for general lawn edging and light weed clearing, you’ll need to rewind the line every 1 to 2 months. If you only use it occasionally for light touch-ups, you can go 3 to 6 months between replacements. You should also replace the line immediately if it becomes shorter than 2 to 3 inches, if it breaks frequently, or if the edges become dull and no longer cut through weeds effectively.

Can I use third-party trimmer line in my Black & Decker?

Yes, you can use third-party trimmer line in your Black & Decker weed eater, as long as it matches the recommended diameter for your specific model. Many third-party lines are just as durable as Black & Decker’s branded line, and often cost less. Just avoid very cheap, low-quality lines that fray easily, as these will break frequently and cause more jams. Always check the line diameter listed on the packaging to ensure it matches your model’s requirements.

Why does my line keep tangling even after I wind it correctly?

If your line continues to tangle despite following the correct winding steps, the most common causes are overfilling the spool, not winding the line tightly enough, or failing to clean debris out of the cutting head before reassembling. Overfilled spools leave no room for the line to move freely, causing it to bunch up and tangle as it feeds out. Loose winding allows the line layers to shift and catch on each other. Built-up grass and dirt in the head can also catch on the line and cause tangles. To fix this, remove the spool, clean the head thoroughly, unwind the line, and rewind it more tightly, leaving a small gap between the line and the spool edge.

Do I need to wear gloves when winding my weed eater line?

Yes, we strongly recommend wearing work gloves when winding your weed eater line. New trimmer line is extremely sharp, and even a small slip can cause deep cuts to your fingers. Gloves also protect your hands from scrapes and cuts from any debris, grass clippings, or sharp edges inside the cutting head. It’s a small precaution that takes almost no time, and can prevent painful injuries.

How do I know what direction to wind my Black & Decker spool?

Nearly all Black & Decker weed eater spools have a small arrow printed on the side of the spool or the cutting head, which indicates the correct winding direction. Always wind the line in the direction the arrow points. If your spool doesn’t have an arrow, you can test the direction by holding the spool in your hand and pulling the end of the line: the direction that pulls the line out smoothly without resistance is the correct winding direction. For most Black & Decker models, this is clockwise, but always double-check your specific model to avoid jams.

Can I wind dual line on a single-line Black & Decker weed eater?

No, you should never wind dual line on a single-line Black & Decker weed eater. Single-line models are designed with a single feed hole and a spool that only holds one piece of line, so using dual line will cause the lines to tangle, jam the head, and put excessive strain on the motor, which can lead to permanent damage. Always use the line type (single or dual) recommended for your specific model, which is listed in your owner’s manual or on the side of the cutting head.

Conclusion

Learning How to Wind Black and Decker Weed Eater line is a simple, valuable skill that will save you time and money in the long run. Instead of spending $15 or more on a pre-wound replacement spool, or $40+ on a new cutting head, you can rewind your existing spool for less than $1 in line costs, in just a few minutes. By following the step-by-step guide outlined in this article, using the correct line for your model, and avoiding common mistakes like winding in the wrong direction or overfilling the spool, you can keep your weed eater running smoothly for years. Remember to clean the cutting head every time you rewind, use the recommended line diameter, and store extra line properly to extend its lifespan. With these tips, you’ll never have to deal with a broken weed eater line mid-project again, and your yard will look neat and tidy all season long.