To re line a weed eater, remove any remaining old line from the trimmer head, measure and cut a new piece of trimmer line to the correct length (typically 10 to 25 feet depending on model), feed the line through the appropriate holes or channels in the head, and secure it using the manufacturer’s locking method. Most trimmer heads use either a fixed-line design where you insert short pieces of line once, or a bump-feed design that holds a longer wound spool and advances line as it wears down. The process varies by brand and model, so consulting your owner’s manual for specific instructions is recommended.
Determining Your Trimmer Head Type
The first step in re lining a weed eater is identifying which type of trimmer head you have. This determines the entire loading procedure, so it is worth taking a moment to examine your equipment before purchasing replacement line. Trimmer heads generally fall into two categories: fixed-line and bump-feed.
Fixed-line heads are the simplest design. They have holes or slots where you insert short pieces of trimmer line. When the line wears down, you remove the old pieces and insert new ones. These heads are common on lighter-duty trimmers and some commercial models. They are easy to reload but offer a smaller cutting swath.
Bump-feed heads hold a larger amount of line on an internal spool. As you trim, you tap the head against the ground, which releases a small amount of fresh line. These heads are more common on residential and mid-range trimmers because they allow you to trim longer without stopping to reload. Within the bump-feed category, there are also rapid-load or easy-load systems that simplify the winding process.
To identify your head type, look at the bottom of the trimmer head. Fixed-line heads typically show exposed holes or open slots. Bump-feed heads have a center bump knob and a housing that encloses the spool. Your owner’s manual or the manufacturer’s website can confirm the exact head type associated with your trimmer model.
Removing Old Trimmer Line
Before loading new line, you need to completely remove the old line from the head. Start by turning off the trimmer and disconnecting the power source, whether that means removing the battery or disconnecting the spark plug wire on a gas model. Safety should always come first when performing maintenance on any power tool.
For bump-feed heads, unscrew or unlock the trimmer head to access the inner spool. Pull any remaining line out of the eyelets and unwind it from the spool. If the line is tangled or fused to the spool due to heat buildup during use, needle-nose pliers can help you grip and extract stubborn pieces. Take care not to damage the spool or the eyelet openings while doing this.
For fixed-line heads, simply pull the worn line pieces out of the holes. Sometimes the line breaks off deep inside the head, making it difficult to grip. In these cases, use pliers or a small flathead screwdriver to gently work the broken piece out. Clearing all old line completely prevents the new line from seating improperly.
While the head is open, wipe away any grass clippings, dirt, or debris that may have accumulated. A clean head operates more smoothly and helps the new line feed without obstruction. Check the eyelets for wear or damage, as rough edges can cause new line to fray quickly.
Selecting the Right Replacement Line
Choosing the correct replacement line is essential for both performance and preventing damage to your trimmer. Trimmer line comes in various diameters, shapes, and materials, and each type serves a different purpose. Using line that is too heavy for your trimmer can strain the motor, while line that is too light may not cut effectively through thick grass.
Most residential weed eaters use line diameters between 0.065 inches and 0.095 inches. Heavier-duty commercial trimmers may require line up to 0.105 inches. Your owner’s manual specifies the recommended diameter for your model, and you should always follow that guidance. If you are unsure, check the trimmer head itself, as many manufacturers print the maximum line diameter on the housing.
Trimmer line is available in round, square, and multi-sided profiles. Round line is the most common and works well for general grass trimming. Square and multi-sided lines have sharper edges that cut through thicker vegetation more efficiently. For heavy weeds or small brush, you may benefit from a heavier, shaped line.
Material also varies. Standard nylon line is affordable and widely available, making it suitable for most residential trimming. Some manufacturers offer reinforced or copolymer lines that resist breakage and wear longer. For specific recommendations, check whether your trimmer brand endorses certain replacement line products.
Cutting Line to Proper Length
Once you have the correct line diameter, you need to cut it to the appropriate length for your head type. Cutting the line to the right length ensures it loads properly and avoids wasted material. The amount of line you need depends on whether you are using a fixed-line or bump-feed head.
For fixed-line heads, you typically need two pieces of line, each approximately 8 to 12 inches long. The exact length depends on the number of holes in your head and the cutting width you want. Shorter pieces are easier to manage but provide a narrower cutting path, while longer pieces give you a wider swath but may cause the trimmer to vibrate if they are unbalanced.
For bump-feed heads, you need a much longer single piece of line, usually between 10 and 25 feet total. The specific length depends on the spool capacity of your head. Overfilling the spool can cause the line to jam, while underfilling means you will need to reload sooner than necessary. Check your owner’s manual or the markings on the spool for guidance.
Use sharp scissors or dedicated line cutters to trim the line cleanly. An angled cut creates a tapered end that feeds more easily through the eyelets and into the spool channels. Avoid cutting with dull tools, as they can crush or fray the line end, making it harder to thread.
Loading Line onto the Trimmer Head
Loading the line correctly is the most important step in the re lining process. The method varies depending on your head type, so follow the instructions that match your equipment. Taking your time during this step helps avoid tangles and ensures the line feeds properly during use.
For a standard bump-feed head, locate the winding direction arrows printed on the inner spool. Thread the line through the center hole or anchor point on the spool, then wind it in the indicated direction. Keep the line taut and evenly layered as you wind. When finished, tuck the line ends into the retaining notches on the spool rim and reassemble the head. Pull the line ends through the outer housing eyelets and ensure they extend freely before attaching the head to the trimmer.
For rapid-load or easy-load bump-feed heads, the process is simplified. Feed both ends of the line through the designated openings, press or twist the mechanism, and the head winds the line automatically. These systems reduce the chance of winding errors and are particularly convenient for users who reline their trimmers frequently.
For fixed-line heads, insert each piece of line through its designated hole, pushing it through until roughly equal lengths extend on both sides. Some fixed-line heads use a locking screw or clip to hold the line in place. Tighten or engage this mechanism to prevent the line from slipping out during operation. Make sure all installed lines are balanced in length to avoid vibration.
Testing and Troubleshooting
After loading the new line, test the trimmer before tackling your full yard. Start the trimmer at a low speed and observe whether the line extends and spins evenly. For bump-feed models, tap the head gently on the ground while the trimmer runs to confirm the line advances as expected. If it does not, turn off the trimmer and check your loading work.
Line that fails to feed is usually caused by incorrect winding direction, a line that is wound too tightly, or the line ends caught on the spool notches. Unwind the spool and rewind the line, following the directional arrows and using moderate tension. Make sure the line ends are released from the retaining notches before reassembling.
Premature line breakage often points to the wrong line diameter, a damaged eyelet, or line that catches on debris in the cutting area. Verify that the line diameter matches your trimmer’s specifications. Smooth any rough spots around the eyelets with fine sandpaper if necessary.
If the line tangles inside the head, the spool may be overfilled. Remove some of the wound line and reload, leaving a small gap between the outermost layer and the edge of the spool. Tangles can also result from winding the line loosely or in alternating directions, so keep the winding consistent and snug.
Line Maintenance and Storage
Proper maintenance extends the life of your trimmer line and reduces how often you need to reline your weed eater. After each trimming session, inspect the remaining line for signs of excessive wear, nicks, or fraying. If the line has become too short to cut effectively, reload it before your next use rather than forcing the trimmer to work with inadequate line.
Store your trimmer in a cool, dry location away from direct sunlight. Ultraviolet light and heat can degrade nylon line over time, making it brittle and prone to breakage. If you store spare trimmer line, keep it in its original packaging or in an airtight container to protect it from moisture and UV exposure.
Avoid letting the trimmer head sit in wet grass or standing water for extended periods. Moisture can cause the line to stick to itself on the spool, creating tangles the next time you try to use the trimmer. After trimming in wet conditions, allow the head to dry before storing it.
Periodically clean the trimmer head to remove accumulated grass, dirt, and debris. A clean head allows the line to wind and feed smoothly. Use a brush or compressed air to clear the spool area and eyelets. This simple maintenance step can prevent many of the common feeding and tangling issues that occur with regular use.
