Direct Answer: How to Change Weedeater Line
To change weedeater line, start by disconnecting the spark plug (gas models) or removing the battery (electric models) so the trimmer cannot accidentally start. Then identify your trimmer head type: a bump-feed head releases line when you tap the bottom on the ground, while a fixed-line head requires manual threading. For a bump-feed head, remove the spool, clear out old line, wind a fresh length of the correct gauge in the direction shown by the arrow on the spool, hook the end into the retention notch, and thread the line through the eyelets when reinstalling. For a fixed-line head, remove the head, insert two equal lengths of line through the opposite holes, and push them until they meet in the center. Always consult your specific model’s manual, because loading mechanisms vary by brand and head design.
Why Changing Weedeater Line Correctly Matters
String trimmers, often called weedeaters regardless of brand, rely on a simple but precise system: a spinning spool feeds out a length of nylon line that cuts grass and weeds. If the line is loaded incorrectly, the trimmer may vibrate excessively, cut unevenly, feed too much or too little line, or stop feeding altogether. In some cases, a badly wound spool can jam the head and put extra strain on the motor or engine.
Correct installation also affects safety. Line that is wound too loosely can tangle inside the head, while line that is too thick for the head can overheat the motor or break the feed mechanism. Taking a few extra minutes to load the spool properly saves you from repeated frustration and keeps the trimmer running smoothly.
How Often Should You Replace Weedeater Line?
There is no universal schedule because usage varies. A homeowner trimming a small yard once a week may only need to replace line every few weeks, while someone clearing a large, rough property may go through line in a single session. Replace the line when the cutting ends become shorter than the recommended length, when the line breaks frequently, or when the head no longer feeds out new line. Keeping a spare spool or a roll of line on hand makes the job quick when you need it.
Tools and Materials You Need
- Safety gear: Work gloves and eye protection.
- Replacement line: The correct gauge and shape for your trimmer, usually listed in the manual or printed on the old spool.
- Scissors or a utility knife: For cutting line to length.
- A clean, flat work surface: So small parts like springs and washers do not roll away.
- The owner’s manual: The most reliable source for head-specific instructions.
- Optional: A screwdriver or wrench if your head uses a bolt or locking tabs.
How to Identify Your Trimmer Head Type
Before you load new line, you need to know which type of head your weedeater has. The two most common designs are the bump-feed head and the fixed-line head, but some trimmers also use speed-feed or automatic-feed heads. Each design requires a different loading method.
What Is a Bump-Feed Head?
A bump-feed head, also called a tap-feed head, is the most common type on residential trimmers. The spool sits inside a housing with a spring-loaded knob or cap on the bottom. When you gently tap the bottom of the head on the ground while the trimmer is running, the knob pushes the spool down, and the centrifugal force releases a small amount of line. The cutting blade at the end of the line then trims the excess to the correct length.
What Is a Fixed-Line Head?
A fixed-line head, sometimes called a manual-feed or pre-cut head, has no internal spool mechanism. Instead, it uses two or more short, pre-cut pieces of line that are inserted through holes in the head and held in place by friction or a locking mechanism. When the line wears down, you remove the old pieces and insert new ones. These heads are common on battery-powered trimmers and lightweight electric models.
How Can You Tell Which Head Type You Have?
Look at the bottom of the head. If there is a visible knob or button that you can press, it is likely a bump-feed head. If the head has small holes around the perimeter and no obvious button, it is likely a fixed-line head. You can also check the manual or look for a diagram printed on the head itself. Many manufacturers print an arrow on the spool or housing to indicate the winding direction, so inspect the parts before disassembly.
Step-by-Step: How to Change Line on a Bump-Feed Head
Follow these steps carefully. The exact disassembly method varies by brand, but the general process is the same for most bump-feed heads.
Step 1: Disconnect Power
For a gas trimmer, remove the spark plug boot or disconnect the spark plug wire. For an electric or battery trimmer, remove the battery or unplug the unit. This prevents the trimmer from starting while your hands are near the cutting head.
Step 2: Remove the Spool
Press the two locking tabs on the side of the head, if present, and pull the spool out. On some models, you unscrew the knob or cap on the bottom of the head to release the spool. Keep the spring and any washers together so you can reassemble them in the correct order. Take a photo with your phone before disassembly if you are unsure.
Step 3: Remove Old Line
Pull any remaining line off the spool and discard it. Check the spool for cracks, worn notches, or a broken anchor slot. If the spool is damaged, replace it with a new one that matches your trimmer model.
Step 4: Cut the New Line to Length
Cut a single piece of line. A common starting length is 3 to 5 meters (10 to 16 feet), but check your manual. Using too much line makes winding difficult and can cause tangles. The line gauge should match the spool’s specifications, typically printed on the spool or in the manual.
Step 5: Insert the Line into the Anchor Slot
Find the small slot or hole on the spool. Insert one end of the line into the anchor slot and pull it through until it catches. Some spools have two anchor slots for loading two separate lines; if so, load each line into its own slot.
Step 6: Wind the Line in the Direction of the Arrow
Look for the arrow printed on the spool. Wind the line tightly and evenly in the direction of the arrow, keeping the coils neat and close together. Avoid crossing the line over itself, because overlapping coils cause jams. Leave about 10 to 15 centimeters (4 to 6 inches) of line unwound at the end.
Step 7: Hook the Line into the Retention Notch
Most spools have a small notch or slot on the outer rim. Slide the loose end of the line into this notch to hold it in place while you install the spool. This step prevents the line from unwinding as you reassemble the head.
Step 8: Reinstall the Spool and Thread the Line Through the Eyelets
Place the spool back into the housing, aligning it with the tabs or grooves. Replace the spring and knob or cap. Pull the loose ends of the line through the eyelets, which are the small holes on the outside of the head. Pull each end until it snaps out of the retention notch. If your head uses one continuous line, both ends should exit through opposite eyelets.
Step 9: Test the Feed Mechanism
Reconnect the spark plug or battery. Hold the trimmer away from your body, start it, and tap the head on the ground once or twice. The line should feed out and be trimmed to the correct length by the blade on the guard. If the line does not feed, turn off the trimmer and check that the spool was wound in the correct direction and that the line is not pinched.
Step-by-Step: How to Change Line on a Fixed-Line Head
Fixed-line heads are simpler because there is no spool to wind. The process involves inserting pre-cut lengths of line into the head’s holes.
Step 1: Disconnect Power
Remove the battery or unplug the trimmer. For gas models, disconnect the spark plug wire. Never work on the head while the trimmer is connected to a power source.
Step 2: Remove the Old Line
Pull the old line out of the holes. If the line is stuck, use pliers to grip it and pull firmly. Some heads have a release button or a locking collar that you must press to free the line.
Step 3: Cut Two Equal Lengths of Line
Measure the old line or check the manual for the recommended length. A typical length for a fixed-line head is 15 to 20 centimeters (6 to 8 inches) per piece, but this varies by model. Cut two identical pieces with scissors or a knife.
Step 4: Insert the Line Through the Holes
Insert one end of the first piece into one of the holes on the head and push it through until it emerges from the opposite side or locks into place. Repeat with the second piece. On some heads, you push the line through a curved channel until it meets in the center; on others, you slide it into a slot and close a locking ring.
Step 5: Secure and Test
Make sure both pieces are seated firmly and cannot be pulled out easily. Reconnect power and run the trimmer briefly to confirm the line stays in place and cuts properly. If the line is too thick to fit the holes, do not force it. Use a smaller gauge that matches the head’s specifications.
Choosing the Right Line: Gauge, Shape, and Material
Using the correct replacement line is just as important as loading it correctly. The wrong gauge or shape can reduce cutting performance and, in some cases, damage the trimmer.
Line Diameter (Gauge)
Trimmer line is sold by diameter, measured in inches or millimeters. Common residential sizes range from about 0.065 inches to 0.105 inches. Smaller diameters, such as 0.065 inches, are suited to light-duty electric trimmers, while larger diameters, such as 0.095 inches or 0.105 inches, are used on heavier gas-powered models. The correct gauge for your weedeater is usually printed on the spool, listed in the manual, or marked on the original packaging. Using a line that is too thick can overload the motor, cause the head to jam, or prevent the line from feeding. Using a line that is too thin will cut poorly and break frequently.
Round vs. Twisted Line
Round line is smooth and cylindrical. It is the most common type and works well for general trimming and edging. Twisted or serrated line has a star-shaped or textured profile that provides more cutting surface. Twisted line cuts through thick weeds faster but can be noisier and may wear the head more quickly. For most homeowners, round line is the safer, more versatile choice. If you want more aggressive cutting, choose a twisted line that matches the recommended gauge for your trimmer.
Material Options
Most trimmer line is made from nylon, but the exact blend affects durability. Standard nylon line is affordable and works well for light to medium jobs. Heavy-duty line contains additives such as carbon or aramid fibers that resist breaking and are better suited to thick brush and hard surfaces. These premium lines cost more but last longer. Always match the gauge to your trimmer head, regardless of the material.
Can You Use Any Brand of Line?
Yes, trimmer line is not proprietary in most cases. You can use any brand as long as the diameter matches what your trimmer head is designed for. The spool itself, however, may be brand-specific. If you are replacing the entire spool, choose one that is compatible with your trimmer model. When in doubt, the manual or the manufacturer’s website will list compatible line sizes and spool part numbers.
Common Mistakes and Troubleshooting When Changing Line
Even experienced users make errors when reloading a trimmer head. Here are the most frequent problems and how to fix them.
Winding in the Wrong Direction
If you wind the line opposite to the arrow on the spool, the line will not feed correctly and may tangle or snap. The arrow indicates the direction the spool rotates during operation. Always wind the line in the direction of the arrow, and recheck the arrow before reinstalling the spool.
Over-Winding or Loose Winding
Filling the spool beyond its capacity prevents the line from releasing. Leaving the line too loose allows coils to overlap and jam. Wind the line tightly, evenly, and only up to the spool’s fill line if one is marked. Leave the recommended tail length unwound so the line can be threaded through the eyelets.
Line Jamming or Not Feeding
If the line does not feed when you tap the head, the spool may be wound in the wrong direction, the line may be pinched under the spool, or the retention notch may not have released. Disconnect power, open the head, and inspect the spool. Also check that the eyelets are not blocked by dirt or debris. Clean the head with a soft brush if needed.
Line Feeding Too Much at Once
If the trimmer releases an excessive amount of line, the spool may be overfilled, or the line may be wound too loosely. Remove the spool, unwind a few coils, and rewind tightly. Also confirm that the line gauge is not too small for the head, because thin line can slip past the brake mechanism.
Line Breaking Frequently
Frequent breakage usually means the line is too thin for the job, the line is old and brittle, or you are trimming against hard surfaces such as concrete or fences. Use a thicker line if the head allows it, store line away from direct sunlight, and avoid letting the line strike hard objects at full speed.
Spool Will Not Stay in Place
If the spool pops out during operation, a locking tab may be broken, or the spool may not be aligned with the housing. Inspect the tabs and the spring. Replace damaged parts rather than forcing the spool back in, because a loose spool can be dangerous at high speed.
Safety Tips and Final Checks Before Restarting
Changing trimmer line is a simple task, but it involves a sharp, fast-spinning tool. Follow these safety practices every time.
Disconnect the Power Source
Always remove the spark plug boot on gas trimmers or the battery on electric trimmers before touching the head. This eliminates the risk of the trimmer starting unexpectedly. If you are working on a corded model, unplug it and keep the plug within sight.
Wear Protective Gear
Wear gloves to protect your hands from the line and any sharp edges on the head. Eye protection is also recommended, especially if the old line is brittle and snaps while you are removing it.
Inspect the Head and Guard
While the head is open, check the cutting guard for cracks and make sure the blade on the guard is present and sharp. The blade trims the line to the correct length, so a missing or dull blade will cause the line to stay too long and reduce cutting efficiency.
Test the Line Before Full Use
After reassembly, run the trimmer at low speed for a few seconds to confirm the line stays in place and feeds correctly. Tap the head on the ground to verify the bump-feed mechanism works. If anything sounds unusual, turn off the trimmer and recheck your work.
When to Consult the Manual
If your trimmer head has a unique mechanism, such as a speed-feed head that loads line without disassembly, or if the spool design differs from the steps above, consult the owner’s manual. The manual contains model-specific diagrams and line specifications. Most manufacturers also provide instructional videos on their websites.
Frequently Asked Questions
Do I need to remove the spool to change weedeater line?
For most bump-feed heads, yes. You must remove the spool to clear old line and wind new line correctly. Some newer speed-feed heads let you thread line through a hole without removing the spool, but the winding principle is the same. Check your manual to see if your model has this feature.
How much line should I put on the spool?
Enough to fill the spool evenly without exceeding its capacity. Most spools hold roughly 3 to 5 meters (10 to 16 feet) of line, but the exact amount depends on the spool size and line gauge. If the spool has a fill line, stop winding there. Overfilling causes jams and poor feeding.
What happens if I use the wrong line gauge?
Using line that is too thick can jam the head, strain the motor, and prevent the line from feeding. Using line that is too thin cuts poorly, breaks often, and may not engage the feed mechanism properly. Always use the gauge recommended in your manual or printed on the spool.
Why does my trimmer line keep coming out when I tap it?
If the line feeds out too much, the spool is likely overfilled or wound too loosely. Remove the spool, rewind the line tightly and evenly, and make sure the line is hooked into the retention notch before reinstalling. Also confirm that the line gauge matches the head specifications.
