How to Load String in Craftsman Weed Eater? Bump Feed Load

Introduction

If you own a Craftsman weed eater, you’ve likely had to replace the trimmer line at some point, especially if you use it regularly for lawn care, edging, or clearing overgrown weeds. The bump feed system is one of the most common designs across Craftsman models, and learning how to load string in Craftsman weed eater correctly will save you time, money on replacement parts, and frustration when your tool stops mid-job. A dull or empty trimmer line can leave you with uneven edges, missed weeds, and a lawn that looks unkempt, even if you’ve spent hours mowing. Many users assume string replacement is complicated, but it’s a simple 10-minute task once you know the process. This guide will walk you through every step, from gathering supplies to troubleshooting common issues, so you can get back to yard work quickly without needing to visit a repair shop.

• Introduction
• Understanding Craftsman Weed Eater Bump Feed Systems
• Tools and Materials You’ll Need
• Step-by-Step Guide: How to Load String in Craftsman Weed Eater
• Preparing Your Weed Eater for String Replacement
• Removing the Old Spool and String
• Preparing the New String for Loading
• Loading the String Onto the Spool
• Reinstalling the Spool and Testing
• Bump Feed vs. Autofeed Weed Eater String Systems
• Tips for Extending String Life and Weed Eater Performance
• Common Mistakes to Avoid When Loading String
• Frequently Asked Questions
• Conclusion

Understanding Craftsman Weed Eater Bump Feed Systems

Craftsman has used bump feed systems in their weed eaters for decades, and the design has remained largely consistent across models, which means the string loading process is almost identical for most Craftsman bump feed trimmers. The only major variations come from the spool release mechanism (twist-lock vs. tab-lock) and the recommended string diameter for different model sizes. Small, lightweight residential models typically use .065 inch string, while larger, more powerful models designed for thick brush use .080 inch string for added durability. Understanding how this system works will make the string loading process make more sense, as you’ll understand how the spool fits into the head and how the line feeds out during use.

How Bump Feed Mechanisms Work

A bump feed system is a mechanism that releases a small length of trimmer line when you tap the bottom of the weed eater head against the ground while the tool is running. This is different from automatic feed systems that release line without user input, and it’s designed to give you control over how much line you deploy, reducing waste. Most Craftsman weed eaters use a spool housed inside a round or curved trimmer head, and the bump feed system relies on a spring-loaded mechanism that engages when you bump the head. When you tap the head, a small lever inside the trimmer head pushes against the spool, rotating it slightly and releasing a pre-cut length of line (usually 2-3 inches) from the bottom of the head. The line is held in place by two small notches on the spool, and as the line wears down from cutting grass and weeds, you can bump the head repeatedly to release more line until the spool is empty. This design is popular because it’s low-maintenance and doesn’t require any electrical or mechanical adjustments to feed line, unlike some older manual feed systems that require you to pull line out by hand.

Tools and Materials You’ll Need

Before you start loading string into your Craftsman weed eater, gather the following supplies to make the process as smooth as possible:

• Replacement trimmer line: Make sure you get the correct diameter for your Craftsman model, usually .080 or .065 inch. Check your owner’s manual if you’re unsure, as using the wrong size can cause feeding issues and damage to your tool.
• Small flat-head screwdriver or spool release tool: Some models require this to release the spool, while others have a twist-lock mechanism that can be released with a coin or butter knife if you don’t have a screwdriver. Avoid using metal tools that can scratch the plastic trimmer head.
• Scissors or trimmer line cutters: To trim the string to the correct length after loading.
• Clean rag: To wipe away grass and debris from the trimmer head before you start working.
• Optional: Small brush or compressed air: To clean out built-up debris from the trimmer head and feed mechanism if it’s clogged.

Most importantly, make sure the weed eater is turned off and the power source is disconnected before you start working. For gas models, remove the spark plug wire to prevent accidental startup. For cordless models, take out the battery pack. For electric models, unplug the power cord from the outlet. This will keep you safe while you work on the tool.

Step-by-Step Guide: How to Load String in Craftsman Weed Eater

The process for loading string into a Craftsman bump feed weed eater is nearly identical across all models, with only minor variations for spool release mechanisms. Follow these steps to load new string quickly and correctly.

Preparing Your Weed Eater for String Replacement

1. Disconnect the power source: For gas-powered Craftsman models, remove the spark plug wire to prevent the engine from starting accidentally. For cordless models, take out the battery pack. For electric models, unplug the cord from the outlet. If you’re using a gas model, make sure the engine is cool before you start working, as a hot engine can cause burns if you accidentally touch the muffler or cylinder head.
2. Lay the weed eater on a flat surface, trimmer head facing up, to give you easy access to the spool.
3. Wipe away any built-up grass, dirt, or debris from the trimmer head and spool housing with your clean rag. This will prevent dirt from getting inside the mechanism when you remove the spool.
4. If your model has a guard or shield over the spool, remove it first by twisting or unscrewing it, depending on your model’s design. Set the guard aside in a safe place so you don’t lose it.

Removing the Old Spool and String

1. Locate the spool release mechanism: Most Craftsman bump feed models have a twist-lock spool that you turn counterclockwise to release, while others have a small tab that you press to pop the spool out. Check your owner’s manual if you can’t find the release mechanism.
2. If it’s a twist-lock model, grip the spool firmly and turn it counterclockwise until it releases from the housing. If it’s a tab model, press the tab inward while pulling the spool straight out of the head.
3. Pull the old spool out of the housing, and remove any remaining string from the spool and the head.
4. Inspect the spool and the feed mechanism inside the head for any damage or built-up debris. If the spool is cracked or the feed notches are worn, you may need to replace the entire spool assembly before loading new string. If the spool is intact, use your small brush or compressed air to clean out any grass or dirt from the feed mechanism inside the head.

Preparing the New String for Loading

1. Cut a length of replacement trimmer line that’s roughly 10-12 feet long. Most Craftsman spools hold about 10 feet of .080 line, or 12 feet of .065 line, so this length will give you enough string to wind the spool without excess.
2. Find the center point of the string by folding it in half, so you have two equal lengths. If your replacement string is coiled, straighten it out first by laying it in the sun for a few minutes or pulling it tight between two fixed points to prevent tangling while winding.
3. If your spool has a small notch or hole in the center, insert the folded end of the string into that notch to hold it in place while you wind the line. Some spools also have a small tab that you can tuck the folded end under to secure it.

Loading the String Onto the Spool

1. Hold the spool in one hand, with the center notch facing up.
2. Wind the two lengths of string around the spool in the direction indicated by the arrows on the spool (almost all Craftsman spools have a clockwise winding direction, but check the arrows to be sure). Wind the string tightly and evenly, keeping tension on the ends as you go to prevent loose winding. Loose winding will cause the string to overlap and tangle as it feeds out, leading to jams and broken line.
3. Don’t overfill the spool: leave about 1/4 inch of space between the wound string and the edge of the spool, so it fits easily into the trimmer head without jamming. Overfilled spools put pressure on the feed mechanism and can cause the line to tangle or break.
4. Once the string is wound, tuck the loose ends of the string into the small notches on the sides of the spool. These notches hold the ends in place so they don’t come loose while you reinstall the spool. Make sure the ends are tucked securely, as loose ends can get caught in the feed mechanism and cause jams.

Reinstalling the Spool and Testing

1. Align the spool with the opening in the trimmer head, making sure the notches with the loose string ends are facing the bottom of the head (where the line feeds out). Installing the spool upside down is one of the most common causes of feeding issues, so double-check the alignment before pushing the spool into place.
2. Push the spool straight into the head until it clicks into place (for tab-lock models) or turn it clockwise until it locks (for twist-lock models). Make sure the spool is seated fully in the housing, as a loose spool will not feed line correctly.
3. Pull the two loose ends of the string out from the bottom of the trimmer head, so they’re even in length. Trim them to 2-3 inches if they’re longer than that, using your scissors or line cutters. Excessively long line can get caught on the guard and not feed out properly.
4. Reattach any guard or shield you removed earlier, making sure it’s secured tightly to prevent debris from getting inside the head.
5. Reconnect the power source: reattach the spark plug wire for gas models, insert the battery for cordless models, or plug in the power cord for electric models.
6. Start the weed eater and test the bump feed: tap the bottom of the trimmer head against the ground while the tool is running, and you should see 2-3 inches of line extend from the bottom. If the line doesn’t extend, turn off the tool and check that the spool is installed correctly and the line is seated in the feed notches.

Bump Feed vs. Autofeed Weed Eater String Systems

While bump feed is the most common system on Craftsman weed eaters, some models use an automatic feed (autofeed) system that releases line without requiring you to bump the head. It’s helpful to understand the differences between the two, especially if you’re shopping for a new Craftsman weed eater or troubleshooting feeding issues. The table below breaks down the key differences between the two systems:

If you have an autofeed Craftsman model, the string loading process is slightly different: you don’t need to leave notches in the spool, and you may need to feed the line through a small hole in the head before winding it onto the spool. Always check your owner’s manual for model-specific instructions, as autofeed systems have different winding and installation requirements than bump feed models.

Tips for Extending String Life and Weed Eater Performance

Proper string loading and maintenance will not only make your string last longer, but it will also keep your Craftsman weed eater running smoothly for years. Follow these tips to get the most out of your tool:

• Use the correct string diameter for your model: Using thicker string than recommended will put extra strain on the engine and cause the spool to jam, while thinner string will break more frequently. Check your owner’s manual for the recommended size for your specific model.
• Store spare string in a cool, dry place: Exposure to sunlight and extreme temperatures can make trimmer line brittle or warped, causing it to break easily during use. Keep spare string in a sealed container in your garage or shed to prolong its lifespan.
• Avoid trimming against hard surfaces: Cutting against concrete, rocks, wooden fences, or tree trunks will wear down the string much faster and can damage the spool mechanism. If you need to edge along a hard surface, use a guard or adjust the cutting angle to minimize contact with the hard material.
• Clean the trimmer head after each use: Wipe away grass and dirt from the spool housing and feed mechanism after every use to prevent buildup that can cause the spool to stick or the line to jam. You can use a small brush or compressed air to clean hard-to-reach areas inside the head.
• Don’t overfill the spool: Leave 1/4 inch of space between the wound string and the edge of the spool to avoid jams and tangles. Overfilled spools put pressure on the feed mechanism and can cause the line to break or tangle as it feeds out.
• Keep a spare loaded spool on hand: If you wind a spare spool with string and keep it in your garage, you can swap out an empty spool in seconds instead of winding new string on the spot when you’re in the middle of a yard work project.

Common Mistakes to Avoid When Loading String

Even experienced users can make small mistakes when loading string that lead to feeding issues and reduced tool performance. Avoid these common errors to keep your Craftsman weed eater running smoothly:

• Winding the string in the wrong direction: If you wind the string counterclockwise on a model that requires clockwise winding, the line will not feed out correctly when you bump the head. Always check the arrows on the spool before winding to ensure you’re using the correct direction.
• Forgetting to tuck the string ends into the spool notches: If the loose ends aren’t secured, they can come loose while you’re winding, causing the string to tangle inside the spool. Always tuck the ends into the side notches before reinstalling the spool.
• Installing the spool upside down: If the notches with the loose string ends are facing the top of the trimmer head instead of the bottom, the line will not feed out. Always make sure the notches are aligned with the feed opening at the bottom of the head before pushing the spool into place.
• Using old or damaged string: Even if the string is the correct diameter, old, frayed, or brittle string will break easily and can get tangled in the spool. Always use new, high-quality trimmer line when replacing your spool.
• Skipping the pre-loading cleaning step: If there’s old grass and debris inside the trimmer head, it can get caught in the feed mechanism and cause the new string to jam. Take an extra 30 seconds to wipe out the head with a rag before installing the new spool to avoid this issue.

Frequently Asked Questions

How often do I need to load string in my Craftsman weed eater?

The frequency depends on how often you use the tool and what you’re cutting. If you’re trimming light grass and weeds a few times a month, a single spool of string can last 2-3 months. If you’re cutting thick weeds, brush, or edging along concrete regularly, you may need to replace the string every 1-2 weeks. You’ll know it’s time to load new string when the line is worn down to less than 1 inch, or when bumping the head no longer releases more line. If you notice the line breaking frequently even when you’re not hitting hard surfaces, it may be time to replace it even if there’s still some length left, as worn string is more prone to breaking.

Can I use third-party trimmer string in my Craftsman weed eater?

Yes, as long as the string matches the recommended diameter for your model. Many third-party brands make high-quality trimmer line that works just as well as OEM Craftsman string, and it’s often less expensive. Just avoid using string that’s too thick or too thin, as this can cause feeding issues and damage to your tool. Always check the packaging to confirm the string diameter matches your model’s requirements before purchasing third-party line.

Why is my string not feeding out after I load it?

There are a few common reasons for this issue: first, the spool may be installed upside down, so the feed notches are not aligned with the bottom opening of the trimmer head. Second, the string ends may not be tucked into the spool notches, so they’re not positioned to feed out. Third, the spool may be overfilled, causing the string to jam inside the head. Fourth, the bump feed mechanism may be stuck with grass or debris, so try cleaning the inside of the trimmer head with a small brush or compressed air. If none of these fixes work, check that the string is wound in the correct direction, as reverse winding will prevent the line from feeding out when you bump the head.

Do I need to wear gloves when loading string?

While it’s not strictly required, wearing gloves is a good idea, especially if you’re using a gas-powered Craftsman weed eater. The trimmer head can be sharp from recent use, and the string ends can cut your fingers if you’re not careful. Gloves also protect your hands from any grease or debris on the spool and trimmer head, and they provide extra grip when removing or installing the spool.

Can I load multiple strands of string on the spool?

No, you should only load one continuous strand of string folded in half, as described in the step-by-step guide. Loading multiple strands will cause the spool to overfill, leading to jams and feeding issues. Most Craftsman spools are designed to hold a single 10-12 foot strand of string, so there’s no need to use multiple strands. Using multiple strands can also put extra strain on the feed mechanism, leading to premature wear and damage.

How do I know what size string to use for my Craftsman weed eater?

The recommended string diameter is listed in your owner’s manual, which is the best source for model-specific information. If you don’t have the manual, you can usually find the information on the Craftsman website by entering your model number. Most standard Craftsman weed eaters use either .065 inch (for light-duty residential use) or .080 inch (for thicker weeds and brush) trimmer line. If you’re unsure, you can also check the side of the old spool, as the recommended diameter is usually printed on it.

Conclusion

Learning how to load string in Craftsman weed eater is a simple, essential skill for any homeowner or landscaper who uses this popular tool regularly. By following the step-by-step guide outlined above, you can replace your trimmer line in 10 minutes or less, without needing to take your tool to a repair shop or pay for professional maintenance. Remember to always disconnect the power source before working on your weed eater, use the correct string diameter for your model, and wind the string in the correct direction to avoid feeding issues. With proper maintenance and correct string loading, your Craftsman weed eater will perform reliably for years, making lawn care and yard work faster and easier. If you run into any issues, refer to your owner’s manual or consult the FAQ section above for troubleshooting tips.