How Do You Wind String on a Weed Eater? (Step-by-Step Guide)

Understanding Your Weed Eater Spool Type

Before you begin winding string, identify which type of spool your weed eater uses. Most residential string trimmers fall into one of three categories: fixed eyelet spools, bump-feed spools, and automatic feed systems. Each design loads line slightly differently, so understanding yours prevents mistakes.

Fixed Eyelet Spools are the most straightforward. These spools have a stationary eyelet (opening) where line exits. You wind the line by hand, anchor it in a notch, and feed the free end through the eyelet when reinstalling.

Bump-Feed Spools automatically advance line when you tap the spool head against the ground. These require you to wind two separate lines on the same spool, each anchored on opposite sides, so the mechanism feeds line evenly.

Automatic Feed Systems use a spring-loaded mechanism inside the trimmer head that advances line as you trim. These are pre-wound spools you simply install; they require no manual winding.

Check your trimmer’s user manual or look at the spool itself for labels indicating the spool type and winding direction.

Tools and Materials You’ll Need

Gather these items before starting:

• Trimmer Line: Purchase line matching your trimmer’s gauge (diameter), typically .065 to .095 inches. Common gauges are .080 and .085 inches. Check your manual for the exact specification.
• Scissors or Line Cutter: A sharp utility knife or dedicated trimmer line cutter cuts line cleanly without fraying.
• Screwdriver: Depending on your model, a Phillips or flathead screwdriver may be needed to remove the spool cover or release clips.
• Measuring Tape: Ensures you cut the correct line length; most spools accommodate 15–20 feet of line.
• Work Surface: A clean, flat area with good lighting makes the process easier and prevents line from rolling away.

Having everything organized before you start prevents interruptions and keeps small parts from getting lost.

Preparing Your Trimmer

Safety first: disconnect the spark plug wire or remove the battery from your string trimmer to prevent accidental starting. This is non-negotiable.

Locate the spool cover or head. Most trimmers have a removable cap held by a screw or press-fit clip. Turn the spool cover counterclockwise (or clockwise, depending on your model) until it separates from the trimmer head. Some models require releasing a safety clip before the spool comes free.

Once the spool is in your hands, inspect it for cracks or damage. A damaged spool may leak line or feed improperly even after reloading. If you see significant damage, replace the spool rather than continuing.

Measuring and Preparing Trimmer Line

The correct line length depends on spool capacity, which ranges from 15 to 20 feet for typical residential trimmers. Your manual specifies the exact length; if you don’t have it, measure by wrapping line around the spool’s diameter multiple times until you’ve filled it, then add 12 inches for anchoring and threading.

Cut the line cleanly with scissors or a utility knife. A clean cut feeds through anchor holes and eyelets more smoothly than a frayed end.

Inspect the spool for an anchor hole or notch—a small opening or indentation where the line’s starting end inserts. Most spools have one or two of these, depending on whether the spool holds one or two lines (bump-feed spools hold two).

The Winding Process

Step 1: Insert the Line

Hold the spool with the anchor hole facing you. Insert approximately 2 inches of line into the anchor hole and seat it firmly. Some spools have a small groove that locks the line in place; ensure it’s fully seated. This prevents the line from unwinding as you wind the rest.

Step 2: Check the Winding Direction

Look for directional arrows on the spool surface or the trimmer head itself. Most spools wind counterclockwise, but some wind clockwise. Winding in the wrong direction causes the line to unwind during use or feed improperly. If arrows are unclear, consult your manual.

Step 3: Wind Tightly and Evenly

Begin winding the line away from the anchor point, keeping tension on the line with your other hand. The line should wrap smoothly without overlapping or bunching. Maintain consistent tension—not so loose that coils overlap, but not so tight that you strain the spool.

Wind in neat, adjacent layers. As each layer reaches the edge of the spool, start a new layer on top, working from the bottom to the top. This prevents the line from slipping back into gaps.

Step 4: Leave Adequate Free Line

Stop winding when 6–8 inches of line remain unwound. This free section threads through the exit eyelet when you reinstall the spool. If you wind too much line onto the spool, the free end won’t reach the eyelet; if you leave too much unwound, you’ll have excess that tangles or catches during trimming.

Step 5: Thread the Exit Eyelet

Locate the exit eyelet—the opening through which line feeds out of the spool during trimming. Insert the free 6–8 inch section of line through this eyelet. The line should pass through smoothly and sit flush against the eyelet opening. Some spools require you to thread the line while the spool sits in the trimmer head; others allow you to thread it before reinstallation. Check your manual for the procedure your model requires.

Reinstalling the Spool

Align the spool with the trimmer head’s central arbor (the shaft the spool rotates on). Insert the spool carefully, ensuring the arbor passes through the spool’s center hole. The line exiting through the eyelet should feed naturally without kinking or binding.

Reattach the spool cover by aligning it with the trimmer head and turning it clockwise until snug. Do not overtighten, as this can crack the cover or damage internal components. The cover should sit flush with the trimmer head with no gaps.

Reconnect the spark plug wire or reinstall the battery. Before using the trimmer, hold it over a trash can and squeeze the trigger a few times. The trimmer should advance line smoothly with each trigger pull. If line doesn’t advance or comes out in tangles, remove the spool and check for improper winding or line misplacement in the exit eyelet.

Common Mistakes and Troubleshooting

Wrong Winding Direction

If you wind the line opposite to the directional arrows, it will unwind during use or refuse to feed. The line essentially works against the spool’s rotation. If this happens, remove the spool, unwind the line, and rewind it in the correct direction.

Overlapping or Bunched Line

Winding too loosely or inconsistently causes line to bunch on top of itself, creating tangles. When you try to advance line during trimming, it catches and jams. Rewind slowly and deliberately, maintaining even tension throughout.

Line Not Feeding After Reloading

This usually means the exit eyelet isn’t threaded correctly or the free line is too short to reach the eyelet. Remove the spool, thread the free end through the eyelet again, and ensure it sits fully in the opening. Reinstall and test.

Trimmer Line Overflowing the Spool

If wound line pushes against the spool cover when you reinstall it, you’ve wound too much. Remove the spool and unwind 2–3 feet. The spool cover should press onto the trimmer head with slight resistance but not force.

Fraying or Splitting During Winding

This indicates the line is too old or brittle. Discard it and use fresh trimmer line. Old line absorbs moisture and becomes prone to splitting. Use line within 2–3 years of purchase for best results.

Maintenance and Replacement Schedule

Trimmer line degrades from UV exposure, heat, and moisture. After every 5–10 hours of trimming, inspect the line for wear, fraying, or visible damage. Replace the line when it becomes consistently shorter than 4 inches (the minimum effective cutting length) or shows significant wear.

Store unused trimmer line in a cool, dry place away from direct sunlight. Keep it sealed in its original packaging or a plastic bag to prevent moisture absorption. Stored properly, trimmer line lasts several seasons.

If you use your trimmer frequently (more than 20 hours per season), reload the spool every 2–3 months or as line depletes. Light users may reload once or twice per season.

Frequently Asked Questions

How much trimmer line do I need per spool?

Most residential weed eater spools hold 15–20 feet of line. Your trimmer’s manual specifies the exact capacity. A simple way to determine the right amount: wind the line onto the spool until it reaches the edges of the spool’s winding chamber. The resulting line length is your spool’s capacity. Measure it, and you’ll know the correct amount for future reloads.

Can I use any trimmer line gauge on my weed eater?

No. Using the wrong gauge causes feeding problems and can stress the trimmer’s motor. The wrong gauge may be too thin (breaking constantly) or too thick (refusing to feed or starting the trimmer). Always purchase line matching your trimmer’s specification, typically found in the user manual or printed on the spool cover. Common residential gauges are .080 and .085 inches; commercial trimmers often use .095 inches or larger.

Why does my trimmer line keep breaking?

Frequent breakage usually stems from one of three causes: the line is too thin for your trimmer model, the line is old or brittle, or the spool is wound incorrectly, causing excessive friction. Verify your gauge matches your trimmer specification, replace old line, and ensure you’re winding tightly without creating bunches or overlaps. If breakage continues, inspect the exit eyelet for burrs or rough edges that could catch and fray the line.

Do I need to replace the spool if I reload it regularly?

No, plastic spools typically last the lifetime of the trimmer when reloaded carefully. However, if the spool cracks, develops burrs on the eyelet, or spins loosely on the trimmer head, replace it. A damaged spool won’t feed line properly regardless of how well you wind it.