Introduction
Ego’s battery-powered weed eaters have become a top choice for homeowners and landscapers alike, thanks to their zero-emission operation, quiet performance, and low maintenance requirements. Unlike gas-powered trimmers, Ego models don’t require oil changes, spark plug replacements, or carburetor tuning, but they do rely on a replaceable trimmer line to cut through weeds, grass, and overgrowth. Over time, this line will wear down, fray, or break from contact with rocks, concrete, and thick vegetation. If you’ve ever asked yourself How to String an Ego Weed Eater? you’re not alone—this is one of the most common maintenance tasks for Ego owners, and it’s far easier than you might think. With just a few basic tools and 10-15 minutes of your time, you can replace the line yourself without paying for a professional service call, and get your trimmer back to peak performance in no time.
- What You’ll Need to String an Ego Weed Eater
- Safety Precautions Before You Start
- Identify Your Ego Weed Eater Model
- Step-by-Step: Stringing a Bump-Feed Ego Weed Eater
- Step-by-Step: Stringing an Auto-Feed Ego Weed Eater
- Comparison: Bump-Feed vs. Auto-Feed Ego Trimmers
- Common Mistakes to Avoid When Stringing an Ego Weed Eater
- Tips for Extending Your Trimmer Line’s Lifespan
- Troubleshooting Common Post-Stringing Issues
- Frequently Asked Questions
- Conclusion
What You’ll Need to String an Ego Weed Eater
Mastering How to String an Ego Weed Eater? starts with gathering the right supplies, so don’t skip this step. Many Ego owners assume they need special branded tools to replace their trimmer line, but that’s not the case. In fact, most of the supplies you need are likely already lying around your garage. The only non-negotiable item is the correct replacement trimmer line for your specific Ego model—using the wrong size or type of line is the most common cause of feeding issues and premature wear.
Required Tools
- Replacement Ego-compatible trimmer line (correct diameter for your model)
- Flathead screwdriver (most Ego trimmers include one in the box, but any small flathead will work)
- Needle-nose pliers (optional, for pulling out stubborn old line)
- Thick work gloves (to avoid cuts from sharp trimmer line)
- Clean rag (to wipe away grass clippings and debris from the trimmer head)
Replacement Line Specifications
Ego designs their trimmers to work with specific line diameters, and using the wrong size will cause feeding jams, increased motor strain, and reduced cutting performance. Most residential Ego bump-feed trimmers use 0.080-inch round line, while heavy-duty models designed for thick overgrowth use 0.095-inch round line. Never use serrated, square, or twisted line unless your owner’s manual explicitly states it’s compatible—these specialty lines put extra strain on the motor and can damage the feed mechanism. You can find the required line size printed on a label on the trimmer shaft, or listed in your owner’s manual.
Safety Precautions Before You Start
While stringing an Ego weed eater is a low-risk task, it’s still important to follow basic safety protocols to avoid injury or damage to your tool. The most critical step is always removing the battery pack before you begin working—Ego trimmers have a safety lock to prevent accidental startup, but disconnecting the power source entirely eliminates any risk of the trimmer turning on while your hands are near the cutting head. Sharp trimmer line can cause deep cuts, so wearing a pair of thick work gloves is non-negotiable, even if you’re an experienced DIYer.
Work in a well-lit, flat area, and lay out a small towel or mat to catch any small parts that might fall while you’re disassembling the head. Finally, keep children and pets away from your work area, as small parts like spools and line pieces can be choking hazards. Never use damaged or frayed line for replacement, as it can break mid-use and fly off at high speed, causing injury.
Identify Your Ego Weed Eater Model
Ego produces a wide range of weed eaters, from lightweight residential trimmers to heavy-duty commercial models, and each requires a specific line diameter and spool design. Using the wrong line for your model will cause feeding issues, increased wear on the motor, and even permanent damage to the trimmer head. The easiest way to find the correct line size is to check the label printed on the trimmer shaft, usually near the battery mount. You can also reference your owner’s manual, which lists the exact line specifications for your model. If you’ve lost your manual, you can find a digital copy on Ego’s official website by entering your model number.
Common Ego Trimmer Models and Their Line Requirements
- Ego ST1500 (bump feed, 0.080” round line)
- Ego ST1511T (auto feed, 0.080” round line)
- Ego ST1530 (bump feed, 0.095” round line for thicker weeds)
- Ego ST1612T (auto feed, 0.080” round line)
- Ego Power+ 56V Commercial Trimmer (bump feed, 0.095” line)
Most entry-level Ego residential trimmers use 0.080” line, while heavy-duty models designed for thick overgrowth use the thicker 0.095” option. If you’re unsure of your model, the model number is printed on a sticker on the side of the motor housing, or on the original packaging if you still have it.
Step-by-Step: Stringing a Bump-Feed Ego Weed Eater
Bump-feed trimmers are the most common Ego model for residential use, and they rely on the user tapping the head on the ground to release more line as it wears down. The stringing process for these models is quick and straightforward, even for first-time DIYers.
Step 1: Remove the Old Trimmer Line
First, remove the battery pack from the trimmer to avoid accidental startup. Locate the line release button on the bottom of the trimmer head—this is a small plastic tab or button that locks the spool in place. Press the release button, then twist the trimmer head counterclockwise to remove it from the shaft. Pull the old spool out of the head, and pull out any remaining old line to discard it. If there’s a lot of grass or debris built up in the head, use your clean rag to wipe it out before proceeding. If your model has a built-in line cutter on the side of the head, use it to cut the old line cleanly if it’s stuck.
Step 2: Prep the Trimmer Spool
Inspect the spool carefully for any cracks, warping, or broken tabs. Ego spools are made of durable plastic, but they can crack if you drop the trimmer or overtighten the spool cover. If the spool is damaged, replace it with an OEM or compatible aftermarket spool—never try to use a cracked spool, as it can break during operation and send line flying at high speed. Locate the line guide holes on the spool: most Ego bump-feed spools have two small holes on opposite sides, one for each end of the line, and a directional arrow printed on the top that shows which way to wind the line.
Step 3: Wind the New Trimmer Line
Cut a 10-12 foot length of the correct diameter line for your model—most Ego bump-feed spools hold exactly 10 feet of 0.080” line. Insert one end of the line into one of the guide holes on the spool, and pull it through until 2-3 inches stick out the other side. Tuck this end into the small notch on the edge of the spool to hold it in place while you wind. Hold the end tight, and wind the line clockwise around the spool, keeping it taut and evenly spaced at all times. Don’t overlap the line, as this will create thick spots that cause jams. When you’re done winding, leave 2-3 inches of line sticking out of the second guide hole, and tuck that end into the notch as well if your spool has one. Critical: always wind the line in the direction the arrow on the spool points—winding it in reverse will prevent the line from feeding when you bump the head.
Step 4: Reinstall the Spool and Test
Align the spool’s tabs with the slots in the trimmer head, then push the spool in until it clicks into place. Reattach the trimmer head to the shaft, twisting it clockwise until it locks tightly. Reinsert the battery pack, then test the feed by turning the trimmer on, holding it at full speed, and bumping the head on a smooth, hard surface (like a patio or sidewalk) 2-3 times. You should see 2-3 inches of line extend from both sides of the head with each bump. If the line doesn’t advance, double-check that you wound it in the correct direction, and that there’s no slack in the line inside the head. If your model has a bump tension knob, adjust it to control how much line is released per bump—turn it clockwise for less line, counterclockwise for more. (See Also:What Oil Goes In A Weed Eater)
Step-by-Step: Stringing an Auto-Feed Ego Weed Eater
Auto-feed Ego trimmers eliminate the need to bump the head to advance line, automatically releasing 2-3 inches of line every 1-2 seconds while the trimmer is running at full speed. These models are ideal for large yards or heavy-duty use, and the stringing process is just as simple as bump-feed models.
Step 1: Remove the Auto-Feed Spool
Start by removing the battery pack from the trimmer. Locate the release lever on the side of the auto-feed head, press it down, and pull the head straight off the shaft. Twist the spool cover counterclockwise to remove it, then pull the old spool out of the head. Discard any remaining old line, and use your rag to wipe away any grass or debris from the spool housing and line guide hole. If your model has a built-in line cutter, use it to cut the old line flush with the spool before removing it to avoid sharp ends.
Step 2: Wind the Line Correctly for Auto-Feed
Cut a 10-12 foot length of the correct diameter line for your model—most Ego auto-feed spools hold 10 feet of 0.080” line. Insert one end of the line into the single guide hole on the spool, and pull it through until 2-3 inches stick out the other side. Tuck this end into the small notch on the edge of the spool to hold it in place while you wind. Wind the line clockwise (follow the directional arrow on the spool) tightly and evenly, keeping it taut at all times to avoid loose loops. Don’t overlap the line, as this will cause jams in the auto-feed mechanism. When you’re done winding, leave 2-3 inches of line sticking out of the guide hole.
Step 3: Reassemble and Calibrate
Align the spool’s tabs with the slots in the trimmer head, then push the spool in until it clicks into place. Screw the spool cover back on clockwise until it’s tight. Reattach the head to the shaft, twisting it clockwise until it locks. Reinsert the battery pack, then turn the trimmer on and let it run at full speed for 10-15 seconds. The auto-feed system will advance the line automatically during this time to prime the mechanism. If the line doesn’t advance, press the calibration button on the side of the head 2-3 times to manually advance it. If it still doesn’t work, check that the line is seated fully in the guide hole, and that you wound it in the correct direction. Note that some Ego auto-feed models have speed-sensitive feed, meaning the line will only advance if the trimmer is running at full speed—make sure you’re holding the throttle fully open when testing.
Comparison: Bump-Feed vs. Auto-Feed Ego Trimmers
If you’re trying to decide between a bump-feed and auto-feed Ego trimmer, or just want to understand the differences between the two line-feeding systems, the table below breaks down the key features, pros, and cons of each design. Both systems are easy to string, as outlined in the steps above, but they’re designed for different use cases.
| Feature | Bump-Feed Ego Trimmers | Auto-Feed Ego Trimmers |
|---|---|---|
| How Line Advances | User taps the trimmer head on the ground to release 2-3 inches of line per bump | Line advances automatically every 1-2 seconds while the trimmer is running at full speed |
| Ideal Use Case | Light residential trimming, small yards, edging around flower beds and walkways | Large yards, thick weeds, heavy-duty trimming, commercial or frequent use |
| Line Wear Rate | Lower, since line only advances when needed | Slightly higher, as line advances continuously during use |
| Ease of Stringing | Simple, 2-hole spool design, no calibration needed | Equally simple, single-hole spool, minimal assembly steps |
| Common Ego Models | ST1500, ST1530, ST450 | ST1511T, ST1612T, Power+ 56V Auto-Feed Trimmer |
For most residential users with small to medium-sized yards, a bump-feed model is more than sufficient, as it uses line more efficiently and is less likely to waste line when you’re edging around tight spaces. If you have a large yard, thick weeds, or use your trimmer frequently for commercial work, an auto-feed model will save you time by eliminating the need to bump the head constantly.
Common Mistakes to Avoid When Stringing an Ego Weed Eater
Even experienced DIYers make mistakes when stringing their Ego weed eater, but these errors are easy to avoid if you know what to watch for. One of the most common mistakes is using a line diameter that’s too thick for your model—while it might seem like thicker line will cut through weeds better, it will actually put extra strain on the motor, cause feeding jams, and reduce the trimmer’s runtime. Another common error is winding the line in the reverse direction: Ego spools are designed to unwind clockwise when you bump the head or run the auto-feed, so winding counterclockwise will prevent the line from advancing at all.
Overlapping the line when winding is another frequent issue, which creates thick spots on the spool that catch on the feed mechanism and cause jams. Finally, many users forget to remove the battery before starting work, which can lead to accidental startup and serious injury—always disconnect the power source first. Using a damaged spool is another risky mistake: cracked or broken spools can shatter during operation, sending plastic shrapnel and line flying at high speed. Always inspect your spool for damage before installing new line, and replace it if you see any cracks or broken tabs.
“The #1 cause of trimmer line issues is using the wrong line diameter for your model. Always double-check your owner’s manual before buying replacement line to avoid costly mistakes.” — Ego Power+ Official Maintenance Guide
Tips for Extending Your Trimmer Line’s Lifespan
Proper line maintenance doesn’t just make stringing easier—it also extends the life of your trimmer and reduces the amount of line you go through over time. One of the best ways to extend line life is to avoid trimming against hard surfaces like concrete, brick, and gravel whenever possible. These surfaces wear down line 3-5 times faster than grass and soft soil, so take the time to edge around walkways and driveways carefully, or use a manual edger for tight spaces. (See Also:What String Does A Ryobi Weed Eater Take)
After each use, wipe the trimmer head and spool with a dry rag to remove grass clippings and dirt, which can build up and cause the line to wear unevenly. Store your trimmer and extra line in a cool, dry place out of direct sunlight—UV exposure makes trimmer line brittle and prone to breaking, while moisture can cause it to warp. If you notice the line wearing down unevenly, check the trimmer head for damage— a bent head will cause the line to hit the ground at an angle, wearing it down faster on one side. Finally, don’t force the trimmer through thick, woody weeds or saplings—use a brush cutter or pruning saw for these tasks, as forcing the line will cause it to snap and can damage the motor.
Troubleshooting Common Post-Stringing Issues
Even if you follow all the steps correctly, you may run into minor issues after stringing your Ego weed eater. The good news is that almost all of these problems are easy to fix with a few quick checks. If your line won’t advance when you bump the head, first check that you wound the line in the correct direction—this is the cause of 80% of bump-feed issues. If the direction is correct, check for slack in the line: if there’s too much loose line inside the head, it will tangle and won’t feed. Pull the line tight and rewind it if needed.
If the line keeps jamming, check that you didn’t overlap the line when winding, and that you’re using the correct line diameter for your model. Debris in the feed path can also cause jams, so wipe out the head thoroughly before reinstalling the spool. If your line breaks immediately after installation, it may be damaged from being wound too tightly, or the spool may have sharp edges that are cutting the line—inspect the spool for damage and rewind the line with a little less tension.
For auto-feed models that won’t advance, first check that the line is seated fully in the guide hole, then press the calibration button 2-3 times to prime the system. Low battery power can also slow or stop the auto-feed mechanism, so make sure your battery is fully charged before testing. If the line feeds too much or too little, adjust the feed calibration on your model if it has one, or rewind the line with slightly more or less tension.
Frequently Asked Questions
How often do I need to replace the line on my Ego weed eater?
Most residential users who trim their yard once a week will need to replace their trimmer line every 2-4 months. If you trim near concrete, gravel, or thick weeds frequently, you may need to replace it as often as every 1-2 months. Always inspect the line before each use for fraying, uneven wear, or weak spots—replacing it early will prevent it from breaking mid-use, which can be dangerous and damage your trimmer.
Can I use aftermarket trimmer line in my Ego weed eater?
Yes, as long as the line is the correct diameter (0.080” or 0.095” depending on your model) and is round-shaped (not square or serrated, unless your model specifies it). Aftermarket line works just as well as OEM Ego line for most users, and is often more affordable. Just avoid cheap, low-quality line that breaks easily, as it will lead to more frequent replacements and potential jams.
Why does my Ego weed eater line keep breaking?
This is usually caused by one of three issues: using the wrong line diameter, winding the line too tightly, or trimming against hard surfaces like concrete or rocks. It can also happen if the spool is damaged, or if the trimmer head is bent. If you’ve checked all of these and the line still breaks, contact Ego customer support to rule out a motor or feed mechanism issue. (See Also:How To Wrap Craftsman Weed Eater String)
Do I need to lubricate the trimmer line before installing it?
No, Ego does not recommend lubricating the trimmer line. Lubricant can attract dirt and debris, which will build up in the trimmer head and cause jams. The line is designed to work dry, and adding lubricant will not improve cutting performance or extend line life.
How much line do I need to wind on the spool?
Most Ego bump-feed spools hold 10-12 feet of 0.080” line, while auto-feed spools hold 8-10 feet. Cut your line to the correct length before winding to avoid excess slack. Never overfill the spool, as this will cause the line to overlap and jam. If you’re unsure of the capacity, check your owner’s manual for the exact recommended length for your model.
Can I string an Ego weed eater without the included tools?
Yes, you only need a flathead screwdriver to remove the trimmer head, and a pair of pliers if you have trouble pulling the old line out. No special Ego-specific tools are required for basic line replacement. If you don’t have a flathead screwdriver, a small coin (like a quarter) can also be used to press the release button on most models.
Conclusion
By following this step-by-step guide to How to String an Ego Weed Eater? you’ll never have to pay for a professional tune-up again. Whether you have a bump-feed or auto-feed model, the process only takes a few minutes with the right tools and correct line. Avoid common mistakes like using the wrong line diameter or winding the line in reverse, and follow the tips in this guide to extend the life of your trimmer line and your tool overall. Regular maintenance like this is part of what makes Ego’s battery-powered tools so reliable, and with proper care, your weed eater will keep your yard looking neat for years to come. If you run into issues that aren’t covered here, consult your owner’s manual or contact Ego’s customer support team for further assistance.