How Do You Restring a Milwaukee Weed Eater? Rewinding

Introduction

Milwaukee is a trusted name in outdoor power equipment, known for building durable, high-performance weed eaters that can tackle even the toughest overgrown yards. But even the most reliable Milwaukee trimmer will eventually stop cutting effectively when its trimmer line wears down, frays, or breaks from impact with rocks, concrete, or thick vegetation. Many homeowners assume they need to pay a professional $30 or more to fix the issue, or even replace the entire tool, but that’s not the case. Restringing a Milwaukee weed eater is a simple, 5-to-10-minute DIY fix that costs just $5 to $10 in replacement line, and requires no special tools or technical skill. If you’re asking, “How Do You Restring a Milwaukee Weed Eater?” you’re in luck: this comprehensive guide covers every step of the process, from choosing the right replacement string to troubleshooting common issues, for both bump feed and automatic feed Milwaukee models. By the end, you’ll be able to restring your trimmer quickly and correctly, saving you time and money for years to come.

Why Your Milwaukee Weed Eater String Breaks So Often

Before diving into the restringing process, it’s helpful to understand why your trimmer line wears out so quickly in the first place. The most common causes of frequent string breakage include:

• Impact with hard surfaces: Hitting rocks, concrete, fence posts, or tree trunks while trimming is the number one cause of string breaks, as the impact snaps the line or causes it to fray.
• Using the wrong string diameter: String that is too thin will break easily under normal use, while string that is too thick strains the trimmer motor and causes premature wear on the line.
• Incorrect winding: Twisting, overlapping, or winding the string in the wrong direction on the spool causes tangles and jams that lead to frequent breaks.
• Old, brittle string: Exposure to UV sunlight, extreme temperatures, and moisture can make trimmer line brittle over time, even if it hasn’t been used much. This is especially common for string stored in garages or sheds over the winter.
• Overloading the trimmer: Trying to cut vegetation that is too thick for your string’s rated capacity (for example, cutting 1-inch thick brush with 0.065-inch string) will cause the line to snap instantly.

Understanding these common causes will help you choose the right string and follow proper restringing techniques to make your new line last as long as possible.

Tools and Materials You’ll Need

One of the best parts of restringing a Milwaukee weed eater is that you don’t need any special or expensive tools to get the job done. Most of the items you’ll need are already lying around your garage or toolbox. For most models, you will need:

• Replacement Milwaukee weed eater string (correct diameter and type for your model, see the next section for sizing guidance)
• Scissors or a sharp utility knife (to cut new string to the correct length)
• Clean rag (to wipe grass, debris, and old string fragments off the trimmer head)
• Work gloves (to protect your hands from sharp, frayed string edges)
• Small flathead screwdriver or paperclip (optional, for prying open locked trimmer heads or releasing spools)

No power tools are required for this process, and you won’t need to purchase any specialized equipment unless your model has a unique spool design (check your owner’s manual for model-specific requirements).

Types of Milwaukee Weed Eater String (and Which to Choose)

Milwaukee recommends specific string types and diameters for their weed eater models, and using the wrong type can lead to frequent breakage, jams, or even damage to the trimmer’s motor and feed mechanism. There are two main shapes of trimmer line to choose from, plus two common diameter sizes for residential and commercial use:

You can find the exact recommended string size for your specific Milwaukee model printed on the bottom of the trimmer head, or listed in your owner’s manual. Most residential models use 0.065-inch round or square string, while commercial-grade models use 0.080-inch diameter. Milwaukee also sells pre-cut, branded replacement string that is sized specifically for their trimmers, which is a good option for beginners who want to avoid cutting string to the wrong length. Never use a string size larger than the manufacturer’s recommendation, as this will strain the motor, reduce runtime, and may void your tool’s warranty.

Step-by-Step Guide: How Do You Restring a Milwaukee Weed Eater?

Milwaukee produces two main types of trimmer heads for their weed eaters: bump feed (the most common, which requires you to tap the head on the ground to advance the string) and automatic feed (which advances string automatically as you trim, no bumping required). The restringing process is slightly different for each, so we’ve broken the steps down by model type below.

Replacing String on Bump Feed Milwaukee Models

Bump feed models are the most widely sold Milwaukee weed eaters, and their restringing process is straightforward once you get the hang of the winding direction. Follow these steps carefully:

1. Disconnect the weed eater from its power source first. For corded models, unplug the tool from the electrical outlet. For cordless models, remove the battery pack completely. This step is critical to prevent accidental startup while you’re working, which can cause serious hand or finger injuries.
2. Place the weed eater on a flat work surface, trimmer head facing up. Use your clean rag to wipe away any grass, debris, or old string fragments from the head and spool.
3. Locate the locking tab on the bottom of the trimmer head. Press the tab inward while rotating the head counterclockwise to release it from the drive shaft. Pull the head straight off the shaft and set it aside in a safe spot.
4. Remove the empty spool from the inside of the trimmer head. Most Milwaukee bump feed heads have a small plastic cover on the bottom of the spool that you can pry open with a flathead screwdriver if it is stuck. Take out any remaining old string pieces and set the spool aside.
5. Take your new replacement string and cut two equal lengths, each 1.5 times the length of your trimmer head’s cutting radius. For most 15-inch Milwaukee models, this works out to 10 to 12 feet per piece. Cut the ends of the string at a 45-degree angle to make threading through the spool holes easier. Make sure both pieces are exactly the same length to avoid excessive vibration during use.
6. Thread one end of the first string piece through the small hole in the center of the spool, leaving 2 to 3 inches of string sticking out of the bottom of the spool. Hold this short end in place against the spool as you wind the string tightly and evenly around the spool, in the direction indicated by the arrow printed on the side of the spool (almost always clockwise for Milwaukee models). Do not overlap the string as you wind, as this will cause jams and feeding issues later.
7. Once you’ve wound the entire length of the first string, leave 4 to 5 inches of loose string at the end, and tuck this end into the small notch on the edge of the spool to hold it in place.
8. Repeat steps 6 and 7 with the second string piece, winding it in the exact same direction as the first string. Tuck the loose end into the spool notch when finished.
9. Align the two string pieces so they are parallel and even, with the ends sticking out of the bottom of the spool by 6 to 8 inches (the ideal cutting length for most residential use). You can trim them to this length now if they are longer.
10. Place the loaded spool back into the trimmer head, making sure the string ends are fed through the guide holes on the top of the head. Snap the spool cover back on if you removed it earlier.
11. Line up the tabs on the trimmer head with the slots on the drive shaft, then rotate the head clockwise until it locks into place. You should hear a distinct click when the head is secure.
12. Reconnect the power source (plug in the corded model or reinsert the battery pack), then test the trimmer by tapping the head on the ground while holding the trigger down. The string should advance smoothly with each tap. If it doesn’t, double-check that you wound the string in the correct direction and that the ends are not tangled.

Replacing String on Automatic Feed Milwaukee Models

Automatic feed Milwaukee models advance string automatically as you trim, so you don’t need to tap the head on the ground to extend the line. The restringing process is slightly simpler for these models, as you don’t need to worry about calibrating the bump feed mechanism. Follow these steps:

1. Disconnect the power source first, just as you would with a bump feed model, to avoid accidental startup during the process.
2. Place the weed eater on a flat surface, trimmer head facing up, and wipe away any grass or debris from the head with your clean rag.
3. Press the release tab on the bottom of the trimmer head and rotate the head counterclockwise to remove it from the drive shaft. Some automatic feed models require you to press a button instead of a tab to release the head, so check your owner’s manual for model-specific instructions.
4. Remove the spool from the head. Most automatic feed Milwaukee heads come with a pre-wound replacement spool, so you can simply swap out the old spool for a new one without winding string yourself. Some models allow you to refill the existing spool with new string, which is a more cost-effective option.
5. If you are refilling an existing spool, cut a single length of string 1.5 times the cutting radius of your head (10 to 12 feet for 15-inch models). Thread one end through the center hole of the spool, leaving 2 to 3 inches sticking out the bottom.
6. Wind the string tightly and evenly around the spool in the clockwise direction indicated by the arrow printed on the side of the spool, with no overlapping. Leave 4 to 5 inches of loose string at the end, and tuck it into the notch on the spool edge to hold it in place.
7. If you are using a pre-wound replacement spool, simply remove the plastic wrap from the new spool and pull the loose string end out from the bottom of the spool.
8. Align the string ends with the guide holes on the top of the trimmer head, then place the loaded spool back into the head and snap the plastic cover on securely.
9. Reattach the trimmer head to the drive shaft by rotating it clockwise until you hear a click, indicating it is locked in place.
10. Reconnect the power source and test the trimmer by holding the trigger down while moving it through grass. The string should extend automatically as you trim, no bumping required. If it doesn’t advance, check that you installed the spool in the correct direction (the arrow on the spool should match the arrow on the trimmer head) and that the string is not tangled.

Tips for Making Your New String Last Longer

Proper usage and maintenance habits can double or even triple the life of your replacement trimmer line, reducing how often you need to restring your Milwaukee weed eater. Follow these simple tips to get the most out of your new string:

• Use the correct string diameter for your model and use case: 0.065-inch string is ideal for light grass trimming, while 0.080-inch string is better for thick brush and commercial use. Never exceed the manufacturer’s recommended size for your model.
• Avoid cutting near hard surfaces like concrete, rocks, and fence posts whenever possible. If you must trim near these surfaces, slow down and avoid scraping the trimmer head against them to reduce impact on the string.
• Don’t overload the trimmer by cutting vegetation that is thicker than your string’s rated capacity. For 0.065-inch string, avoid cutting stems thicker than 1/2 inch; for 0.080-inch string, avoid stems thicker than 3/4 inch.
• Store extra replacement string in a cool, dry place out of direct sunlight. UV exposure and moisture can make string brittle and prone to breaking, even if it’s never been used.
• Wind the string tightly and evenly on the spool when restringing: loose, uneven winding causes tangles and jams that wear out string faster and cause feeding issues.
• Clean the trimmer head regularly to remove grass and debris buildup, which can cause the string to bind and break prematurely. Wipe the head down with a dry rag after each use to keep it in good condition.
• If you frequently cut near hard surfaces, switch to square serrated string, which is more impact-resistant and less likely to break from accidental contact with rocks or concrete.

Common Mistakes to Avoid When Restringing

Even experienced DIYers make these common errors when restringing their Milwaukee weed eaters, which can lead to string breakage, jams, or even damage to the trimmer’s motor. Avoid these mistakes to make the process faster and ensure your new string lasts as long as possible:

• Overfilling the spool: Many people wind as much string as possible onto the spool, but this causes the string to overlap and bind, leading to constant jams and breaks. Only wind the recommended length of string, and leave a small gap between the top of the spool and the string layers to prevent overlapping.
• Winding the string in the wrong direction: If you wind the string counterclockwise (the wrong direction for almost all Milwaukee models), the string will not advance properly when you bump the head or use the automatic feed. Always follow the arrow printed on the spool, which clearly indicates the correct winding direction.
• Using the wrong string type or diameter: As mentioned earlier, using string that is too thick will strain the motor and reduce runtime, while string that is too thin will break constantly. Check your owner’s manual for the recommended size before purchasing replacement string.
• Not securing the loose string ends: If you don’t tuck the loose end of the string into the notch on the spool after winding, it will come undone while you’re working, leading to a tangled mess that requires you to start the restringing process over.
• Twisting the string while winding: Twisting causes the string to bind on the spool and not feed properly. To avoid twisting, hold the string taut as you wind, and don’t let it loop or kink as you wrap it around the spool.
• Skipping the safety step of disconnecting power: It’s tempting to skip unplugging the trimmer or removing the battery to save time, but accidental startups are a common cause of hand and finger injuries during restringing. Always disconnect the power source before you start working on the trimmer head.

Troubleshooting Common Post-Restringing Issues

Even if you follow all the steps correctly, you may run into small issues after restringing your Milwaukee weed eater. Here are the most common problems and how to fix them quickly:

• String won’t advance when I bump the head (bump feed models): This is almost always caused by winding the string in the wrong direction, or overlapping the string on the spool. Remove the spool, unwind the string, and rewind it in the correct direction, making sure there are no overlaps.
• String keeps breaking immediately after restringing: Check that you cut the string to the correct length (6 to 8 inches for most models) – longer string puts too much strain on the motor and causes breaks. Also, make sure the string is not tangled or twisted on the spool.
• Trimmer head is vibrating excessively after restringing: This is almost always caused by uneven string lengths or tangled string on the spool. Turn off the trimmer, remove the spool, and adjust the string ends so they are exactly the same length and not tangled.
• String is not cutting evenly: This usually means one side of the string is longer than the other. Adjust the string ends so they are exactly the same length, then test the trimmer again.
• Automatic feed models won’t advance string: First, make sure you installed the spool in the correct direction (the arrow on the spool should face the same direction as the arrow on the trimmer head). If that’s correct, check that the string is not tangled, and that the feed mechanism is not blocked with grass or debris.
• String is jamming constantly: This is almost always caused by overfilling the spool or winding the string unevenly. Remove the spool, take out all the string, and rewind it tightly and evenly, with no overlapping, leaving a small gap at the top of the spool. If you’ve tried all these fixes and your trimmer still isn’t working properly, contact Milwaukee customer support for model-specific assistance, as there may be an issue with the drive shaft or feed mechanism that requires professional repair.

Frequently Asked Questions

How often should I restring my Milwaukee weed eater?

The frequency depends on how often you use the trimmer and what you’re cutting. For light residential use (trimming grass once a week), you’ll need to restring every 2 to 3 months. For heavy use (cutting thick brush or commercial use), you may need to restring every 1 to 2 weeks. You’ll know it’s time to restring when the string becomes frayed, brittle, or shorter than 4 inches, or when the trimmer stops cutting effectively even with a full spool. If you store your weed eater in a garage or shed over the winter, the string may become brittle from temperature changes, so you may need to restring more often in the spring.

Can I use generic replacement string for my Milwaukee weed eater?

Yes, you can use high-quality generic replacement string as long as it matches the diameter and type recommended for your specific Milwaukee model. Avoid cheap, low-quality string, as it is more prone to breaking and can damage your trimmer’s feed mechanism. Look for string labeled as compatible with Milwaukee weed eaters, or check the size requirements in your owner’s manual before purchasing to ensure a proper fit.

What size string does my Milwaukee weed eater use?

Most residential Milwaukee weed eaters use 0.065-inch diameter round or square string, while commercial-grade heavy-duty models use 0.080-inch diameter string. You can find the exact recommended size for your model printed on the bottom of the trimmer head, or listed in your owner’s manual. Never use a string size larger than the manufacturer’s recommendation, as this can strain the motor, reduce runtime, and may void your tool’s warranty.

Why does my string keep jamming after restringing?

String jams are almost always caused by one of three issues: overfilling the spool, winding the string unevenly or in the wrong direction, or using string that is too thick for your model. To fix the jam, remove the spool, take out all the string, and rewind it tightly and evenly in the correct direction, making sure there are no overlaps and that you don’t overfill the spool. If jams persist, check that the feed mechanism is not blocked with grass or debris.

Do I need to replace the entire spool if the string breaks?

No, you do not need to replace the entire spool if the string breaks. Most Milwaukee weed eater spools are designed to be refilled with new string, which is much more cost-effective than buying a whole new spool. Only replace the entire spool if it is cracked, broken, or the feed mechanism is damaged.

Can I restring a Milwaukee weed eater without removing the head?

For most Milwaukee models, you will need to remove the trimmer head from the drive shaft to access the spool and restring it. Some newer models have a quick-release spool that allows you to remove the spool without taking off the entire head, but you will still need to access the bottom of the head to remove the spool. Check your owner’s manual for model-specific instructions.

Conclusion

Restringing a Milwaukee weed eater is one of the simplest, most cost-effective maintenance tasks you can do to keep your outdoor power equipment in top shape. Unlike paying a professional $30 or more for a service call, or replacing the entire tool when the string wears out, restringing takes just 5 to 10 minutes, costs $5 to $10 in replacement line, and requires no special tools or technical skill. We covered the key steps to answering the question, “How Do You Restring a Milwaukee Weed Eater?”: choose the correct string type and diameter for your model, follow the proper winding direction for your bump feed or automatic feed trimmer head, avoid common mistakes like overfilling the spool or winding the string incorrectly, and use our troubleshooting tips if you run into issues after installation. By following the steps and best practices outlined in this guide, you’ll be able to restring your Milwaukee weed eater quickly and correctly every time, extending the life of your tool and keeping your yard looking neat all season long.