How to String a Weed Eater Step by Step at Home
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How do I string a weed eater? Power the trimmer off, remove the spool cap, load a new length of line onto the spool in the direction the arrow shows, feed each end through its eyelet, and reinstall the spool. The steps differ a little between standard heads and speed-feed heads, and the line diameter must match what your trimmer accepts. The method below follows a consumer how-to guide and works for most gas and cordless trimmers, but your owner’s manual overrides any general step where the two disagree.
Quick answer
- Turn the trimmer fully off first. For gas models cut the engine, for cordless models remove the battery, and for corded models unplug it.
- Use line of the diameter your head accepts. Common sizes in the guide run from 0.065 inch light-duty up to 0.11 inch heavy-duty.
- Wind the line in the direction of the arrow on the spool, keep it snug, and do not overfill the spool.
- After reinstalling, press the head and pull out a few inches at a time. If the line will not extend, reload it.
What you need before you start
You need the replacement line, the trimmer, a pair of gloves and about ten minutes. Some heads come with a spool that is already loaded, so the job is only a swap. Others take a bulk line that you wind yourself. Check which type your head uses before you open anything, because the steps below assume you are winding a bare spool by hand.
Keep the old spool or a photo of it. The old line shows you how the spool was threaded and which eyelet the line went through. That is the quickest reference when the new line goes in.
Step 1: Power the trimmer down
Safety comes first. Line replacement should only be done with the string trimmer completely powered down. On a gas trimmer, that means cutting the engine and letting the head stop moving. On a cordless trimmer, remove the battery. On a corded trimmer, unplug it. Do not rely on a switch that only pauses the motor, because the head can turn if the trigger is pressed by accident.
Set the trimmer on the ground with the cutting head facing up. This keeps the head steady while you work and stops the spool from rolling away. A bench or a clean sheet of cardboard is a good surface because it keeps the spool and small parts together.
Step 2: Remove the cap and the old spool
Most heads hold the spool under a cap that you release in one of two ways. Some caps have two tabs you pinch together. Others unscrew. Once the cap is off, lift out the spool and discard any leftover line. If the spool has fused line stuck to it, clear it out now so the new line sits flat.
Check the spindle and the housing for debris. Grass and dirt can build up around the spool seat, and a clean seat helps the spool sit at the correct height. A small brush or the tip of a screwdriver is enough.
Step 3: Measure the new line
Cut the new line to the length the guide recommends. The guide suggests measuring with your arm span: pull the line out and extend your arm fully, and make three pulls to reach the total length. The method gives a practical length for most spools without a tape measure. If your head is a dual-line head, cut two lengths of the same size so both sides feed evenly.
Choose the diameter with care. The guide notes that line comes in thicknesses from light-duty 0.065 inch to heavy-duty 0.11 inch. Use the size on the spool or head label, and if you are not sure, read the owner’s manual before cutting.
Step 4: Wind the line onto the spool
Find the hole or slot on the spool where the line starts. Insert the line, leaving a short tail. Look for the arrow on the spool, which shows the direction to wind. Wind the line evenly, keeping it snug but not tight. Do not overfill the spool. The guide says a spool that is too full may not seat under the cap, and line that is wound loosely can tangle when it feeds.
Once the line is wound, feed each end through its eyelet on the spool. Many spools have two small eyelets on the outside, one for each end of the line. Push the spool back into the housing and twist it until it locks. The spool should sit flat and turn freely by hand.
If you buy line that is already wound, this step is done for you. Replacing the whole spool is quicker than re-winding, though it costs more per foot.
Step 5: Reinstall the spool and cap
The reinstall depends on the head type. On a standard head, thread the line through the spindle holes, set the spool into the head and replace the cap. Make sure the cap clicks or seats fully before you move on. On a speed-feed head, align the hash marks on the spool with the marks on the head, thread the line through one eyelet and out the other, and check that each side has an even length. Then turn the head base to wind the line in and seat the spool.
Work slowly here. A cap that is not seated can come loose once the head starts to spin, and a loose cap is a hazard as well as a nuisance.
Step 6: Set the line length
Press the head against the ground or a hard surface, then pull out a few inches of line at a time. The line should feed out smoothly. If the line will not extend at all, the spool is probably loaded incorrectly, so take the cap off and check the winding. Do not pull out so much line that it rubs against the head’s shield, because the line can jam or break at the shield edge.
Once the line extends, start the trimmer and check that the head spins freely. Run it at low speed on a bare patch first. If it wobbles or the line tangles, stop and reload the spool.
Common stringing problems and fixes
The most common fault is a line that will not feed. This usually means the spool was wound against the arrow, the line is too thick for the eyelet, or the spool was overfilled. Take the spool apart, rewind it, and check the diameter.
The second common fault is a head that rattles or vibrates after stringing. This often means one end of the line is shorter than the other, or the cap has not seated. Check the cap first, then the line length on each side.
The third fault is line that breaks at the head edge. Check that the line is not too long, and that it is not rubbing against the shield. A line that is too thin for the work also breaks more often, so consider a heavier diameter if your trimmer accepts it.
Choosing a trimmer that is easy to string
Some trimmers in the listings this site tracks describe automatic feed systems, which feed line out when the head is tapped or started rather than by hand. The listings say the feature removes the need to stop and adjust line, but they do not describe how the spool is loaded. If you want to avoid manual winding altogether, a trimmer with a bump-feed or automatic feed head may suit you better. The BLACK+DECKER 14-inch trimmer listing says its automatic feed spool technology eliminates bumping for hassle-free line feeding. The BLACK+DECKER combo listing describes an AFS automatic feed spool for continuous operation. A DCA trimmer listing describes auto feed in its title. None of these listings explains how the spool is replaced, so check the manual for the spool procedure before you buy.
If you already own a trimmer, the steps in this guide still apply. Check the head type first, then follow the matching reinstall step.
Replacement line for common trimmers
The Husqvarna Titanium X-Pro .095 inch line is listed as a spooled trimmer line for several Husqvarna trimmer models, including 430LS, 535LS, 522L and 525L. Its listing says it works with both gas and cordless trimmers and comes in .095 and .105 inch gauges. If you have one of the listed models, that line is a direct match to check against your head. The listing also says the spool is 200 feet, which is a longer run than most heads need in a single season.
If you are shopping for a new trimmer rather than replacement line, the guide above works with any head that takes a spool. The steps do not change between brands, but the arrow direction, the eyelet layout and the cap release vary, so read the head markings before you start.
FAQ
How do I know which way to wind the line?
Look for the arrow on the spool. The guide says the arrow shows the direction to wind, and the line should be wound in that direction. Winding against the arrow is a common reason a line will not feed.
How much line should go on the spool?
Wind the line snug but not tight, and do not overfill the spool. The guide says an overfilled spool may not seat under the cap, and loose winding can cause tangles during feeding.
Can I use a thicker line than my trimmer came with?
Only if the head accepts it. The guide says to use the diameter your trimmer supports, and the owner’s manual or the label on the head is the reference. A line that is too thick can jam the eyelet or stall the motor.
Do I need to remove the battery or unplug the trimmer?
Yes. The guide says line replacement should only be done with the string trimmer completely powered down. Remove the battery on a cordless model, unplug a corded model, and cut the engine on a gas model before you touch the head.
Why does my trimmer head wobble after stringing?
The most common reasons are an unequal length on the two sides of a dual line, or a cap that is not fully seated. Check the cap and the length of each side. If the head still wobbles, take the spool out and rewind it.
Is it cheaper to re-wind or buy a pre-loaded spool?
Re-winding costs less per foot, but a pre-loaded spool is quicker and avoids the winding step. The guide notes that a pre-loaded spool costs more but saves time. Choose based on how often you restring and how much time you want to spend on it.
Bottom line
Power the trimmer off, match the line diameter to your head, wind the spool in the arrow direction without overfilling it, and reinstall the cap until it seats. Then feed out a few inches of line and test it on a bare patch. If the head does not match the steps, the owner’s manual is the final reference.
Related reading
For choosing the trimmer itself, Best Gas Weed Eaters: 4-Cycle Models Compared covers gas models, and Best DeWalt 20V Max Brushless Weed Eaters covers battery trimmers that use the same stringing steps.
