How to Replace Weed Eater String Troy Bilt? Easy DIY Guide

Introduction

Troy Bilt weed eaters are a favorite among homeowners and landscaping professionals for their durability, power, and ease of use. But even the most reliable trimmer will underperform when its cutting string is worn, frayed, or too short to work effectively. Many people assume replacing weed eater string requires a trip to a repair shop or a pricey service call, but the truth is, it’s a simple 10-to-15-minute DIY task that anyone can complete with basic household tools. If you’ve been searching for How to Replace Weed Eater String Troy Bilt? you’re in the right place: this comprehensive guide walks you through every step of the process, from identifying when your string needs replacing to choosing the right replacement type, avoiding common mistakes, and extending the life of your new string. By the end of this guide, you’ll have the confidence to tackle this maintenance task yourself, save money on repairs, and keep your Troy Bilt trimmer running at peak performance all season long.

• Introduction
• Understanding Your Troy Bilt Weed Eater
• When to Replace Your Weed Eater String
• Tools and Materials You’ll Need
• Step-by-Step Guide: How to Replace Weed Eater String Troy Bilt
• Replacing String on a Bump Feed Troy Bilt
• Replacing String on an Autofeed Troy Bilt
• Choosing the Right Replacement String
• Tips and Best Practices for Longer String Life
• Common Mistakes to Avoid When Replacing String
• Frequently Asked Questions
• Conclusion

Understanding Your Troy Bilt Weed Eater

Troy Bilt produces a wide range of gas and electric weed eaters for residential and commercial use, and while the string replacement process is nearly identical across all models, there are two key differences you’ll need to account for: the type of string feed system your trimmer uses, and the recommended string size for your specific model. Most Troy Bilt weed eaters use one of two feed systems: bump feed, which requires you to tap the trimmer head on the ground to release more string, or autofeed, which automatically advances the string when you release the throttle after cutting. Knowing which type you have will ensure you follow the correct steps for replacement, and prevent jams or damage to your trimmer head.

Common Troy Bilt Weed Eater Models

Some of the most popular Troy Bilt weed eater models include the TB145 17-Inch 25cc 2-Cycle Gas Trimmer, the TB154 17-Inch 25cc 4-Cycle Gas Trimmer, the TB180 17-Inch 25cc 2-Cycle Gas Trimmer, and the TB135 13-Inch 15-Amp Electric Trimmer. The TB145, TB154, and TB180 all use bump feed systems, while newer autofeed models include the TB240 17-Inch 25cc 2-Cycle Gas Trimmer and the TB137 13-Inch 20-Volt MAX Lithium-Ion Cordless Trimmer. If you’re unsure which model you have, check the label on the trimmer shaft or the back of the trimmer head for the model number, and refer to your owner’s manual for specific replacement guidelines.

When to Replace Your Weed Eater String

Replacing your weed eater string at the right time will keep your trimmer running efficiently, prevent unnecessary strain on the engine, and ensure you get clean, even cuts every time. Waiting too long to replace worn string can lead to poor performance, increased fuel consumption, and even damage to your trimmer head or engine. Knowing the signs that your string needs replacing will help you stay on top of maintenance and avoid costly repairs down the line.

Signs Your String Needs Replacing

There are several clear signs that your Troy Bilt weed eater string is ready for replacement. First, inspect the string before each use: if it is frayed, split, or has visible notches and worn spots, it will cut poorly and is at risk of breaking mid-use. Second, if the string has worn down to less than 4 inches in length, it will not be able to cut through thick weeds or grass effectively, and will put extra strain on your trimmer’s engine. Third, if your trimmer is smoking or sputtering while in use, it may be because the worn string is creating too much friction as it spins. Finally, if your string is jamming frequently or not advancing properly, it may be too worn or tangled to function correctly, and replacing it will resolve the issue.

Tools and Materials You’ll Need

Replacing the string on your Troy Bilt weed eater requires only a few basic tools and materials, most of which you likely already have at home. Having everything ready before you start will make the process faster and more efficient, and ensure you don’t have to pause mid-task to hunt for supplies. Here’s what you’ll need:

• Replacement weed eater string: Make sure to get the correct diameter and type for your Troy Bilt model (we’ll cover how to choose the right string later in this guide).
• Work gloves: Protect your hands from sharp string ends and any debris in the trimmer head.
• Safety glasses: Shield your eyes from grass, dirt, and small debris when testing your trimmer after replacement.
• Wire cutters or heavy-duty scissors: To cut the replacement string to the correct length.
• Small flathead screwdriver (optional): For older Troy Bilt models with stubborn spool caps that are hard to twist off by hand.
• Small brush or old toothbrush (optional): To clean out grass and debris from the trimmer head before installing the new spool.

Step-by-Step Guide: How to Replace Weed Eater String Troy Bilt

The exact steps for replacing your Troy Bilt weed eater string will vary slightly depending on whether your model has a bump feed or autofeed system. Below, we’ve broken down the process for both feed types, with clear, easy-to-follow instructions for each. Before you begin, always prioritize safety: if you have a gas-powered model, disconnect the spark plug wire to prevent accidental startup. For electric models, unplug the trimmer from the power outlet or remove the battery pack. Never attempt to replace the string while the trimmer is plugged in or the spark plug is connected.

Replacing String on a Bump Feed Troy Bilt

Bump feed systems are the most common on Troy Bilt residential weed eaters, and they are designed for easy, tool-free string replacement. Follow these steps to replace the string on your bump feed model: (See Also:How To Replace Electric Weed Eater String)

1. Disconnect the power source: For gas models, pull the spark plug wire off the spark plug to prevent the trimmer from accidentally starting while you work. For electric models, unplug the trimmer or remove the battery pack. This is the most important safety step, and should never be skipped.
2. Locate the trimmer head and spool: The spool is located at the bottom of the trimmer head, usually covered by a round plastic cap. Flip the trimmer over so the head is facing up for easier access.
3. Remove the spool cap: Twist the spool cap counterclockwise to loosen it. Some models have small release tabs on the side of the cap that you’ll need to press in while twisting. Once loose, pull the cap straight off to expose the string spool inside.
4. Remove the old spool: Pull the old spool straight out of the trimmer head. You may need to wiggle it slightly to loosen it if it’s stuck. Once removed, discard the old string, and use a small brush to clean out any grass, dirt, or debris from inside the trimmer head and spool cavity. Buildup of debris can cause jams and prevent the new string from advancing properly.
5. Cut the new string to length: Most bump feed spools require two pieces of string, each cut to a length equal to twice the diameter of the spool, or per the specifications in your owner’s manual. For most Troy Bilt bump feed models, this is 2 x 10 feet, or 20 inches total (10 inches per side). Use wire cutters to cut the string to the correct length.
6. Thread and wind the string: Insert one end of the string through the eyelet on the spool, leaving about 4 inches of string sticking out of the eyelet. Hold the spool steady and wind the string tightly and evenly around the spool, following the direction of the arrow printed on the side of the spool (almost always clockwise for bump feed models). Repeat with the second piece of string on the opposite side of the spool, again leaving 4 inches of string sticking out of the eyelet.
7. Reinsert the spool: Align the tabs on the spool with the slots inside the trimmer head, then push the spool straight in until it clicks into place. Make sure the spool is seated fully and does not wobble.
8. Secure the spool cap: Place the spool cap back over the spool, then twist it clockwise until it is snug. Do not over-tighten the cap, as this can make it difficult to remove the next time you need to replace the string.
9. Test the trimmer: Reconnect the spark plug wire (for gas models) or plug in the trimmer/reinsert the battery (for electric models). Turn on the trimmer and tap the head on the ground while the string is spinning to advance it. The string should extend 4-5 inches from the head, and cut through grass and weeds smoothly. If the string does not advance, double-check that you wound it in the correct direction and left enough string sticking out of the eyelets.

Replacing String on an Autofeed Troy Bilt

Autofeed (or automatic feed) systems are designed to advance the string automatically when you release the throttle after cutting, so you don’t have to bump the head on the ground. The replacement process is similar to bump feed, but there are a few key differences to note. Follow these steps to replace the string on your autofeed Troy Bilt model:

1. Disconnect the power source: Just like with bump feed models, disconnect the spark plug wire for gas trimmers, or unplug/remove the battery for electric/cordless models to prevent accidental startup.
2. Locate the autofeed trimmer head: Autofeed heads have a small window on the side that allows you to see the string inside, and release tabs on the side of the head to remove the spool assembly.
3. Remove the spool assembly: Press the two release tabs on the side of the trimmer head, then pull the spool assembly straight out. Some models require you to twist the spool slightly after pressing the tabs to release it, so check your owner’s manual if it doesn’t pull out easily.
4. Remove the old string and clean the head: Pull the old string off the spool, and discard it. Use a small brush to clean out any grass, dirt, or debris from inside the trimmer head and spool cavity, as buildup can cause the autofeed mechanism to jam.
5. Cut the new string to length: Autofeed spools use a single continuous piece of string, cut to a total length of 12-15 feet (6-7 feet per side) for most Troy Bilt models. Check your owner’s manual for the exact recommended length for your model, as some larger trimmers require longer string.
6. Thread the string through the head: Insert one end of the string through the feed hole on one side of the trimmer head, and the other end through the feed hole on the opposite side. Pull both ends through until they are even, with about 6-7 inches of string sticking out of each side of the head.
7. Wind the string onto the spool: Align the spool with the feed holes, then wind each end of the string tightly and evenly around its respective side of the spool, following the direction of the arrow printed on the spool (usually counterclockwise for autofeed models, which is the opposite of bump feed). Leave about 4 inches of string sticking out of each side of the spool after winding.
8. Reinsert the spool assembly: Align the spool with the slots inside the trimmer head, then push it straight in until you hear a click, indicating the release tabs have locked into place. Make sure the spool is seated fully and does not wobble.
9. Test the autofeed mechanism: Reconnect the power source, turn on the trimmer, and cut through a patch of grass or weeds. Release the throttle after cutting, and the string should advance automatically by 2-3 inches. If the string does not advance, double-check that you wound it in the correct direction and left enough string sticking out of the feed holes.

Choosing the Right Replacement String

Using the correct replacement string for your Troy Bilt weed eater is critical for optimal performance, and to avoid damage to your trimmer head or engine. The wrong string size or type can cause jams, poor cutting performance, and excessive wear on your trimmer’s components. When shopping for replacement string, there are three key factors to consider: material, diameter, and shape.

String Materials

Most replacement weed eater string is made from one of three materials: standard nylon, polymer blend, or stainless steel. Standard nylon is the most affordable option, and works well for light residential use on grass and thin weeds, but it frays quickly when used on thick vegetation or hard surfaces. Polymer blend string is more expensive, but it is more durable, resistant to heat and abrasion, and lasts 2-3 times longer than standard nylon, making it a better choice for regular use. Stainless steel string is designed for heavy-duty commercial use on woody brush and dense vegetation, but it is more expensive and can damage older trimmer heads that are not designed for metal string. For most Troy Bilt residential models, polymer blend or standard nylon string is the best choice.

String Diameter

The diameter of your replacement string is one of the most important factors to get right, as using a string that is too thick or too thin will cause performance issues. Most Troy Bilt residential weed eaters use .065 inch diameter string, which is the standard size for light to medium residential use. If you have a larger, more powerful Troy Bilt model designed for thick weeds and light brush, you may need .080 inch diameter string for better cutting power. Using a string that is too thick will put extra strain on your trimmer’s engine, cause jams, and reduce the life of your trimmer head. Using a string that is too thin will break quickly, and will not cut through thick weeds effectively. Always check your owner’s manual for the exact recommended string diameter for your model.

String Shape

Replacement string comes in three main shapes: round, square, and serrated. Round string is the most common, and works well for all-purpose residential use on grass and thin weeds. Square string has sharper edges that cut through thicker weeds and light brush more effectively, but it creates more noise and can wear down faster on hard surfaces. Serrated string has small teeth along the edges that are designed to cut through woody brush and dense vegetation, making it the best choice for heavy-duty use. For most homeowners, round .065 inch string is more than sufficient for regular lawn maintenance.

Tips and Best Practices for Longer String Life

With proper care and maintenance, you can extend the life of your replacement weed eater string and reduce how often you need to replace it. These simple tips will help you get the most out of your string, and keep your Troy Bilt trimmer running smoothly for longer:

• Always disconnect the power source before working on your trimmer: This is the most important safety rule, and will prevent accidental startup that could cause serious injury.
• Do not over-wind the string: Winding the string too tightly or too many times around the spool can cause tangles, jams, and put extra strain on the trimmer’s engine. Follow the length guidelines in your owner’s manual, and leave 4-5 inches of string sticking out of each eyelet after winding.
• Keep the string at the correct length: Most Troy Bilt weed eaters perform best with 4-5 inches of string extending from the head. Longer string strains the engine, reduces cutting efficiency, and breaks more quickly. If your string is longer than 5 inches, trim it to the correct length with wire cutters.
• Clean the trimmer head regularly: Grass, dirt, and debris can build up inside the trimmer head and spool cavity, causing jams and preventing the string from advancing properly. Wipe out the head with a dry cloth after each use, and do a deeper clean with a small brush every few months.
• Avoid hitting hard surfaces: Hitting rocks, sidewalk edges, or other hard objects with your weed eater string will cause it to fray, break, and wear out much faster. Try to keep the string 1-2 inches above the ground when trimming along hard edges, and use a edging tool for precise cuts along sidewalks and driveways.
• Store your trimmer properly: When storing your Troy Bilt weed eater for extended periods (such as over the winter), remove the string entirely to prevent it from becoming brittle and breaking. Store the trimmer in a cool, dry place out of direct sunlight, as UV rays can degrade nylon string over time.

Common Mistakes to Avoid When Replacing String

Even experienced DIYers can make mistakes when replacing weed eater string, leading to jams, poor performance, and even damage to their trimmer. Avoiding these common mistakes will make the replacement process faster and easier, and ensure your new string works perfectly from the start: (See Also:How To Remove Head On Milwaukee Weed Eater)

• Skipping the spark plug disconnect: This is the most dangerous mistake you can make. Even if you think the trimmer is off, an accidental bump of the throttle can cause the string to spin at full speed, leading to serious cuts or eye injuries. Always disconnect the spark plug or remove the battery before starting any maintenance.
• Winding the string in the wrong direction: Every Troy Bilt spool has a directional arrow printed on the side that shows which way to wind the string. Winding in the wrong direction will cause the string to tangle, jam, and not advance properly when you use the trimmer. If you’re unsure, check the arrow on the old spool or in your owner’s manual.
• Using the wrong string diameter: As mentioned earlier, using string that is too thick or too thin will cause performance issues. Always check your owner’s manual for the recommended diameter, and avoid using string that is larger than .080 inches unless your model is specifically designed for it.
• Not leaving enough string sticking out: If you don’t leave 4-5 inches of string sticking out of each eyelet after winding, the string will not advance when you use the trimmer. For bump feed models, you’ll have to manually pull the string out every few feet, and for autofeed models, the string may not advance at all.
• Over-tightening the spool cap: Tightening the spool cap as much as possible may seem like a good idea to keep it from coming loose, but over-tightening can crack the plastic cap or make it impossible to remove the next time you need to replace the string. Tighten the cap until it is snug, but stop as soon as you feel resistance.
• Not aligning the spool tabs correctly: When reinserting the spool into the trimmer head, make sure the tabs on the spool fit into the slots on the head. If the spool is misaligned, it will wobble, cause the string to jam, and may damage the trimmer head over time.

Frequently Asked Questions

How often should I replace my Troy Bilt weed eater string?

The frequency with which you need to replace your Troy Bilt weed eater string depends on how often you use the trimmer and the type of string you use. For light residential use (1-2 hours per week), standard nylon string will need to be replaced every 1-2 months. For medium use (3-5 hours per week), plan to replace it every 2-3 months. Polymer blend string lasts 2-3 times longer than standard nylon, so it will need to be replaced less frequently. Always inspect your string before each use for fraying, wear, or short length, and replace it as soon as you notice any damage.

Can I use third-party replacement string for my Troy Bilt?

Yes, you can use third-party replacement string for your Troy Bilt weed eater, as long as it matches the diameter and type recommended in your owner’s manual. Many third-party brands produce high-quality string that meets or exceeds the performance of original equipment manufacturer (OEM) Troy Bilt string, at a lower cost. Avoid cheap, low-quality string that frays quickly, as it can cause jams, poor cutting performance, and damage to your trimmer head.

Why is my new string jamming after replacement?

Jamming after string replacement is almost always caused by one of a few common issues. First, you may have used the wrong string diameter for your model, which is too thick to fit through the trimmer head’s feed holes. Second, you may have wound the string in the wrong direction, causing it to tangle inside the spool. Third, you may have over-wound the string, causing it to overlap and jam. Fourth, you may not have left enough string sticking out of the eyelets, so it cannot advance properly. To fix the issue, remove the spool, double-check the string size and winding direction, and rewind the string following the steps in this guide.

Do I need special tools to replace the string on my Troy Bilt?

No, you do not need any special tools to replace the string on most Troy Bilt weed eaters. The vast majority of models use a simple twist-off or tab-release spool system that requires no tools at all to remove and reinstall. The only tools you may need are wire cutters to trim the string to length, work gloves, and safety glasses. (See Also:How To Make A Weed Eater Scooter)

How do I know if my Troy Bilt has a bump feed or autofeed system?

You can easily tell which feed system your Troy Bilt has by looking at the trimmer head. Bump feed models have a round, smooth head with a small button on the bottom, and you have to tap the head on the ground while the trimmer is running to release more string. Autofeed models have a head with a small rectangular window on the side that shows the string inside, and the string advances automatically when you release the throttle after cutting.

Conclusion

Mastering How to Replace Weed Eater String Troy Bilt? is a simple, valuable skill that every Troy Bilt owner should have in their DIY toolkit. Replacing your trimmer’s string takes less than 15 minutes, requires no special tools, and costs a fraction of the price of a professional service call. By following the step-by-step instructions in this guide for your specific feed type, choosing the right replacement string for your model, and avoiding the common mistakes we covered, you can keep your Troy Bilt weed eater running at peak performance all season long. Regular string maintenance will not only improve your trimmer’s cutting efficiency, but also extend the life of your machine and save you money on costly repairs down the line. So next time you notice your string is frayed or worn, don’t hesitate to replace it yourself – with this guide, you’ll have it done in no time.