Direct Answer: How to Spool a Weed Eater
To spool a weed eater, remove the trimmer head by unscrewing or unclipping it from the shaft, extract the old line, measure and cut new line to the correct length (typically 10–15 feet depending on your model), wind it tightly onto the spool in the direction indicated by arrows on the spool, thread the line ends through the eyelets, and reassemble the head. The exact process varies by trimmer type—bump-feed and fixed-line models differ—so consult your user manual for specific instructions.
Types of Weed Eater Trimmer Heads
Before you begin spooling your weed eater, you need to identify which type of trimmer head you have. The two most common designs—bump-feed and fixed-line—use different spooling methods, and attempting the wrong technique can damage your trimmer or waste time and materials.
Bump-Feed Trimmer Heads
Bump-feed heads are the most popular design found on consumer-grade weed eaters. This style features a spool that automatically advances a small amount of line each time you tap the trimmer head against the ground during use. The spool sits inside a plastic housing and is designed to hold a continuous loop of trimmer line wound in a specific pattern. When you need fresh line, you remove the spool, wind new line onto it, and reinsert it into the housing.
Fixed-Line Trimmer Heads
Fixed-line heads, sometimes called manual-feed heads, require you to manually pull out line from the spool and cut it to length. These are less common on residential models but frequently appear on commercial-grade trimmers. Spooling a fixed-line head follows the same basic winding principle as bump-feed but typically uses a larger diameter spool and may accommodate longer line lengths.
How to Identify Your Trimmer Type
Check your weed eater’s user manual—the quickest way to identify your trimmer head type. If you’ve lost the manual, look at the trimmer head itself: bump-feed heads usually have a small rounded cap or button at the base (the bump mechanism), while fixed-line heads appear more open and expose more of the spool housing. You can also search your trimmer’s model number online to find specifications.
Tools and Materials You’ll Need
Gathering the right supplies before you start prevents frustration and ensures a smooth restringing process.
- Replacement trimmer line: Purchase line that matches your trimmer’s specifications (see gauges below). Buy more than you think you’ll need—typically 50–100 feet of line costs only a few dollars and ensures you don’t run short mid-project.
- Flathead screwdriver or hex key: Needed to remove the spool or trimmer head cap. Check your manual to see if your model uses a specific tool.
- Work gloves: Protect your hands from sharp plastic edges on the spool or housing.
- Safety glasses: Recommended when disassembling any power tool to protect your eyes from flying debris.
- Tape measure or ruler: Used to measure line length before winding.
Selecting the Correct Trimmer Line Gauge
Trimmer line comes in different thicknesses, measured in inches (decimal) or millimeters. Common gauges include .080 inch, .095 inch, and .105 inch. Using the wrong gauge can result in poor cutting performance, line breakage, or the trimmer head not functioning properly. Consult your trimmer’s manual or the model plate on the trimmer for the correct gauge. When in doubt, most consumer trimmers use .080 or .095 inch line.
How Much Line Should I Purchase?
Spool capacity varies by model. Bump-feed heads typically hold 15–20 feet of line, while fixed-line heads can accommodate 50+ feet. Buying pre-packaged trimmer line (usually 50–100 feet per spool) is more economical than purchasing line by the foot. You’ll use the line gradually over time as you respool, so buying in bulk makes sense.
How to Remove the Trimmer Head
Safe and correct removal of the trimmer head is the first step to successful respooling.
Disassembling a Bump-Feed Head
Most bump-feed heads are held on by a central cap or cover that either screws on or clips in place. Follow these steps:
- Unplug your electric trimmer or turn off your gas-powered trimmer and allow the engine to cool.
- Locate the cap or cover at the center of the trimmer head. It usually has a small notch or slot.
- Use a flathead screwdriver to gently pry or turn the cap counterclockwise until it comes free. Some models may require a specific tool—if you’re unsure, check your manual.
- Once the cap is removed, you’ll see the spool underneath. It may be held in by a small center bolt or may simply lift out. If there’s a bolt, remove it with the appropriate wrench or screwdriver.
- Carefully lift the spool out of the housing. Be aware that springs or spacers may be attached and could fall out—set them aside in a safe place so you don’t lose them.
Disassembling a Fixed-Line Head
Fixed-line heads typically feature a larger cap with two or more notches around the edge. To remove:
- Locate the two notches (or slots) on opposite sides of the spool cap.
- Insert two flathead screwdrivers into these notches and turn counterclockwise simultaneously to unscrew the cap.
- Once the cap comes free, the spool will be accessible. Lift it out carefully and note any springs or washers underneath.
What to Watch Out For
When opening the trimmer head, be careful not to lose small components like springs, washers, or spacers. These are critical for proper reassembly. If your trimmer head has a bump mechanism (a small spring and rubber bumper), handle it gently and keep it in a safe spot. Some older models may have line remaining on the spool—use needle-nose pliers to pull it out carefully.
Measuring and Preparing Your Trimmer Line
Getting the line length right is essential for proper spooling and trimmer performance.
How to Measure the Correct Length
Most trimmers specify the correct line length in their manual or on a decal attached to the trimmer. If that information isn’t available, a general rule is to use enough line to wrap around the spool 2–3 times completely. For most bump-feed heads, this is approximately 10–15 feet. Measure the line using a tape measure, then cut it to length using scissors or a utility knife. Cut the line at a slight angle to make threading it through the eyelets easier.
Should I Soak the Line Before Spooling?
Some users soak trimmer line in warm water for 10–15 minutes before winding to make it more flexible and easier to wrap tightly. This is optional but can reduce tangles and make the line sit better on the spool. If you soak the line, pat it dry with a towel before winding.
Step-by-Step Spooling Instructions
This is the core of the respooling process. Follow each step carefully to ensure proper winding.
Step 1: Identify the Winding Direction
Look at your spool for arrows or directional markings. These arrows show which direction the line should be wound. If there are no arrows visible, consult your manual. Winding in the wrong direction is one of the most common mistakes and will prevent the line from feeding properly. The direction matters because the spool design assumes line will be wound a specific way to feed smoothly from the eyelets.
Step 2: Locate and Prepare the Starting Point
Most spools have a small notch or hook near the center where you anchor the line before winding. Insert one end of your trimmer line into this notch—this secures it so the line won’t slip during winding. If your spool doesn’t have a notch, hold the line against the spool with one hand while you wind with the other.
Step 3: Wind the Line Tightly and Evenly
Using your fingers or a small winding tool (some spools come with one), begin winding the line around the spool in the direction indicated. Wind tightly and evenly, layer by layer, so that each wrap sits snugly against the previous one. Loose winding leads to tangles and poor line feeding. Work methodically, keeping tension on the line as you go. Continue until you’ve wound all the line you measured onto the spool, leaving about 6–8 inches of line extending from the spool.
Step 4: Secure the End of the Line
Once all line is wound, most spools have a small notch or slot on the rim where you secure the loose end. Insert the 6–8 inch tail into this notch. This prevents the wound line from unwinding and keeps everything neat until reassembly.
Step 5: Thread the Line Through the Eyelets
Before reassembling the head, you need to route both line ends through the eyelets (the small holes where the trimmer line exits the head). On bump-feed heads, these are usually on the plastic guard or housing. Thread each line end through its respective eyelet—typically there are two eyelets on opposite sides. Make sure the line passes completely through so it hangs freely. If your model has only one eyelet or uses a different configuration, consult your manual.
Troubleshooting During Winding
If your line tangles or gets crossed during winding, stop immediately. Unwind back to where the tangle started, straighten the line, and resume winding. It’s better to take extra time than to wind a tangled spool that won’t feed properly. If you make a mistake winding the entire spool, unwind it completely and start over—the line is reusable.
Reassembling Your Trimmer Head
With the line spooled and threaded, it’s time to put the trimmer head back together.
Reinserting the Spool
Carefully lower the wound spool back into the trimmer head housing. Make sure any springs, washers, or spacers that were underneath are in their correct positions. If your spool has a center hole, align it with the center post in the housing. Lower the spool evenly so nothing gets pinched or misaligned.
Replacing the Center Cap
Once the spool is seated in the housing, replace any bolts or fasteners you removed earlier. Then screw or clip the center cap back on. Turn it clockwise until it’s snug—don’t over-tighten, as this can crack the plastic cap or damage the internal mechanism. The cap should sit flush with the top of the head.
Final Line Adjustment
Before using your trimmer, pull gently on both line ends to ensure they feed smoothly from the eyelets. They should extend 2–3 inches beyond the trimmer guard. If the line doesn’t feed easily, the spool may be wound incorrectly or something inside the head is misaligned—disassemble and check.
Test Before Use
Plug in your electric trimmer (without the cutting head guard attached) and trigger the throttle briefly to see if the bump mechanism advances the line as expected. For gas-powered models, start the engine and let it idle briefly. The line should feed smoothly when you tap the head on the ground (for bump-feed models). If nothing happens or the line doesn’t move, stop immediately and review your spooling and reassembly steps.
Troubleshooting Common Spooling Issues
Even experienced users encounter problems. Here’s how to diagnose and fix the most common issues.
Line Won’t Feed Properly After Spooling
If the line doesn’t advance when you tap the trimmer head on the ground (or doesn’t pull out when you demand it on a fixed-line model), the problem is usually one of the following:
- Wrong winding direction: The most common issue. Check your spool or manual for directional arrows and respool if necessary.
- Spool wound too loosely: Loose winding allows the line to slip. Unwind and re-spool with more tension.
- Line stuck in the housing: The line may have twisted around the center post or gotten caught on the spool housing rim. Disassemble, straighten the line, and reassemble.
- Bump mechanism damaged: If the small rubber bumper or spring inside the head is broken or missing, the automatic advance won’t work. Check your manual for replacement parts.
Line Jamming During Use
If the line suddenly stops advancing or breaks frequently during trimming:
- Line wound too tightly: Extremely tight winding can prevent smooth feeding. Respool with slightly less tension.
- Wrong line gauge: Using line thicker than specified for your trimmer can cause jamming. Check your manual and respool with the correct gauge.
- Debris in the housing: Grass clippings or dirt inside the head can jam the mechanism. Open the head and clean out any debris before respooling.
Line Breaking Frequently
Premature line breakage usually indicates one of these problems:
- Wrong line type or quality: Low-quality or incorrect gauge line breaks more easily. Use line from a reputable manufacturer that matches your trimmer specifications.
- Worn eyelets: If the eyelets have rough edges or burrs, they’ll cut the line. Feel inside the eyelets with your finger—if they’re rough, carefully smooth them with fine-grit sandpaper or replace the housing.
- Hitting hard objects: Striking rocks, pavement, or metal fence posts will break any line. Be mindful of what you’re trimming near.
Tips for Maintaining Your Trimmer Spool
Proper maintenance extends the life of your trimmer and keeps the spooling mechanism working smoothly.
How Often Should I Respool?
Most users respool every 2–4 weeks during regular mowing season, depending on how frequently they use the trimmer and the size of their yard. Some heavy users may need to respool weekly. You’ll know it’s time when the line is worn down to about 1 inch on each side of the guard.
Can I Use Any Brand of Trimmer Line?
You should use line that matches your trimmer’s gauge specifications, but the brand is less critical. Most quality aftermarket lines work fine and are cheaper than original equipment manufacturer (OEM) line. Avoid extremely cheap or unknown brands, which tend to break more easily or tangle frequently. Read reviews or ask your local equipment retailer for recommendations.
Storage and Off-Season Care
When storing your trimmer for the winter or an extended period, don’t leave the spool wound with old line. Remove the line before storage, as it can dry out, harden, or become tangled. Store the trimmer in a dry place, and keep replacement trimmer line in a cool, dry spot (not exposed to direct sunlight, which can degrade the material).
Frequently Asked Questions
Q: What happens if I wind the line in the wrong direction?
A: The line won’t feed properly from the spool. It may bunch up inside the housing or refuse to advance when you tap the trimmer head. Always check your spool or manual for directional arrows before winding.
Q: Can I use thicker line on my trimmer than the manual specifies?
A: No, using line that’s too thick for your trimmer can cause jamming, reduce cutting efficiency, and strain the motor. Always use the gauge specified in your manual. Thicker line is designed for more powerful trimmers.
Q: How do I know if my spool is damaged and needs replacement?
A: Signs of a damaged spool include cracks in the plastic, a warped or bent center post, worn eyelets, or a bump mechanism that no longer works. If the spool itself is cracked or severely warped, it’s usually cheaper to replace it than repair it. Check your manual for replacement spool part numbers.
Q: Is it normal for trimmer line to break occasionally during use?
A: Some line breakage is normal, especially if you hit hard objects or use the trimmer in thick brush. However, if you’re breaking line multiple times per mowing session, check your line gauge, eyelet condition, and spooling technique. Persistent breakage usually indicates one of these three issues.
