How to Wrap Craftsman Weed Eater String? Bump Head

Introduction

Learning how to wrap Craftsman weed eater string on a bump head is a fundamental skill for any homeowner or landscaping professional who wants a clean, efficient cut every time. A properly loaded trimmer head feeds line smoothly, reduces wear on the motor, and prevents frustrating interruptions during yard work. This guide walks you through the entire process, from understanding the bump‑head mechanism to selecting the right line, executing a flawless wrap, and maintaining the head for long‑term performance. Whether you are a first‑time user or looking to refine your technique, the step‑by‑step instructions, practical tips, and troubleshooting advice below will help you achieve professional results with minimal effort.

• Understanding the Bump Head Mechanism
• Tools and Materials Needed
• Safety Precautions
• Choosing the Right Trimmer Line
• Step‑by‑Step Guide: How to Wrap Craftsman Weed Eater String
• Tips and Best Practices
• Common Mistakes and How to Avoid Them
• Troubleshooting: String Not Feeding Properly
• Maintenance and Storage
• Frequently Asked Questions
• Conclusion

Understanding the Bump Head Mechanism

The bump head, also called a “tap‑and‑go” head, releases new line when the user lightly taps the head against the ground while the trimmer is running. Inside the housing, a spool holds a length of nylon line wound in a specific direction. Centrifugal force pulls the line outward, and the tap action advances the spool just enough to expose fresh cutting length. Craftsman models typically use a dual‑line spool, meaning two equal lengths of line feed simultaneously, providing a wider cutting swath. Knowing the rotation direction of the spool (usually indicated by an arrow on the head) is critical because winding the line opposite to that direction will cause the line to jam or fail to feed. The head also contains a spring‑loaded eyelet that guides the line out of the housing; keeping this eyelet clean ensures smooth operation. Familiarity with these components makes the wrapping process intuitive and reduces the chance of errors.

Tools and Materials Needed

Before you begin, gather the following items so the job proceeds without interruptions:

• Craftsman weed eater with bump head installed
• Replacement trimmer line (diameter matching the head specification, typically .080‑.095 in)
• Scissors or a sharp utility knife for cutting line
• Work gloves to protect hands from sharp edges
• Safety glasses or goggles
• Clean rag or brush for removing debris from the head
• Owner’s manual for model‑specific line length and winding direction

Having the correct line diameter is essential; a line that is too thick will not feed, while a line that is too thin may break under load. The manual often lists the maximum line length the spool can hold—usually 15‑20 feet per side for dual‑line heads. Cutting the line to the exact length before winding saves time and prevents excess line from bunching inside the housing.

Safety Precautions

Safety should always be the first priority when servicing any power equipment. Follow these precautions before you start wrapping the string:

• Turn off the engine and disconnect the spark plug wire (or remove the battery on cordless models) to prevent accidental starts.
• Allow the trimmer to cool completely if it has been running recently.
• Wear safety glasses to protect your eyes from any stray line fragments.
• Use gloves to avoid cuts from the line’s sharp ends.
• Work on a stable, flat surface with good lighting.
• Keep children and pets away from the work area.

These steps eliminate the risk of injury and ensure you can focus on the winding technique without distraction.

Choosing the Right Trimmer Line

Not all trimmer line is created equal. The performance of your Craftsman bump head depends heavily on line shape, material, and diameter. Round line is the most common and works well for general grass trimming. Twisted or serrated line cuts thicker weeds more aggressively but can increase vibration. Square or star‑shaped line offers a sharper cutting edge for heavy brush but may wear the head’s eyelet faster. For most residential Craftsman models, a .080‑inch round nylon line provides a balanced mix of durability and feed reliability. If you frequently tackle dense brush, consider a .095‑inch twisted line, but verify that your head’s maximum diameter rating accommodates it. Always purchase line from reputable brands to avoid inconsistencies in diameter that can cause feeding problems.

Step‑by‑Step Guide: How to Wrap Craftsman Weed Eater String

Follow these ordered steps to load your bump head correctly. Each step includes the rationale so you understand why the action matters. (See Also:How To Change String In A Weed Eater)

1. Remove the bump head. Press the release tabs (or unscrew the retaining knob) and pull the head off the drive shaft. This gives you full access to the spool.
2. Open the spool. Most Craftsman heads split into two halves. Separate them by pressing the side latches or unscrewing the center cap. Keep the spring and eyelet components together so they do not get lost.
3. Clean the spool and eyelet. Use a rag or brush to remove grass clippings, dirt, and old line fragments. A clean path prevents the new line from snagging.
4. Cut two equal lengths of line. Measure the length specified in the manual (typically 15‑20 feet per side). Cut both pieces at the same time to ensure they are identical.
5. Identify the winding direction. Look for an arrow molded on the spool or the head housing. The line must be wound in the direction of that arrow; otherwise the centrifugal force will pull the line inward instead of outward.
6. Insert the first line end. Feed one end of the first line piece into the anchor hole on the spool’s inner flange. Pull it through until a few inches remain protruding.
7. Wind the first line. Holding the spool steady, wind the line neatly in tight, even layers following the arrow direction. Avoid crossing lines; each layer should sit directly on top of the previous one.
8. Secure the first line. When you reach the end, tuck the loose end into the retaining notch or slot on the spool flange. This prevents the line from unwinding during re‑assembly.
9. Repeat for the second line. Insert the second line into the opposite anchor hole (dual‑line spools have two anchor points 180° apart). Wind it in the same direction, keeping the two lines separated by the spool’s central divider.
10. Re‑assemble the spool. Snap the two halves together, ensuring the spring and eyelet sit correctly. Verify that both line ends protrude through the eyelets.
11. Re‑attach the bump head. Align the head with the drive shaft, push until the release tabs click, or tighten the retaining knob securely.
12. Test the feed. Reconnect the spark plug wire (or battery), start the trimmer, and lightly tap the head on the ground. Fresh line should extend evenly from both sides.

Detailed Walkthrough for Dual‑Line vs Single‑Line Bump Heads

Most Craftsman residential trimmers ship with a dual‑line bump head, but some older or compact models use a single‑line spool. The winding procedure is identical except that a single‑line spool has only one anchor hole and no central divider. When winding a single‑line spool, you simply fill the entire spool circumference with one continuous line. The key difference is line consumption: dual‑line heads use twice as much line per reload, so you’ll replace line more often, but they deliver a wider cut. If you ever need to convert a dual‑line head to single‑line operation (for lighter work), you can wind only one side and leave the other anchor empty, but the head’s balance may be slightly affected.

Tips and Best Practices

• Pre‑stretch the line. Pull each cut length gently before winding; this reduces memory coils that can cause uneven feeding.
• Wind under slight tension. Keeping the line taut while winding creates tight, uniform layers that release cleanly.
• Do not overfill. Leave a small gap (about ¼ inch) between the outer line layer and the spool flange to allow the line to expand under centrifugal force.
• Match line length to spool capacity. Exceeding the recommended length forces line into the eyelet, leading to jams.
• Inspect the eyelet regularly. A worn or cracked eyelet will fray the line and cause premature breakage.
• Store spare line in a cool, dry place. UV exposure and moisture degrade nylon, making it brittle.
• Use the correct line diameter for your model. Refer to the owner’s manual; using a larger diameter than specified can stall the motor.

Common Mistakes and How to Avoid Them

Even experienced users can fall into habits that reduce trimmer performance. Below are the most frequent errors and practical fixes.

• Winding opposite to the arrow. This causes the line to retract instead of extend. Always double‑check the arrow before you start winding.
• Crossing the two lines on a dual‑line spool. Crossed lines tangle and prevent independent feed. Keep each line on its own side of the central divider.
• Leaving excess line protruding from the anchor hole. Long tails can snag on the housing. Trim the anchor ends to about ½ inch after securing.
• Using worn or contaminated line. Old line that has been exposed to sunlight becomes brittle. Replace line at the start of each season.
• Forgetting to clean the eyelet. Grass buildup creates friction. A quick brush after every few uses keeps feed smooth.
• Over‑tightening the retaining knob. Excessive force can crack the head housing. Tighten until snug, then stop.

Troubleshooting: String Not Feeding Properly

If the bump head fails to release new line after tapping, run through this quick diagnostic checklist:

1. Check line length. Too much line can bind inside the housing. Remove the head and verify the line does not exceed the spool flange.
2. Inspect the eyelet for damage. Cracks or sharp edges will catch the line. Replace the eyelet if necessary.
3. Verify winding direction. Re‑wind if the line was installed opposite the arrow.
4. Examine the spring. A weak or broken spring cannot push the spool forward on tap. Replace the spring assembly.
5. Confirm the head is seated correctly. A misaligned head can prevent the spool from rotating freely.
6. Test with the engine at operating speed. Low RPM may not generate enough centrifugal force to pull line out.

Most feeding issues resolve after one of these steps. If problems persist, consult the Craftsman service manual or contact a certified repair center.

Maintenance and Storage

Proper care extends the life of both the bump head and the trimmer line. After each use, wipe the head housing with a dry cloth to remove grass sap and debris. Periodically (every 20‑30 hours of operation) disassemble the head, clean the spool, eyelet, and spring, and apply a light coat of silicone spray to the moving parts—avoid petroleum‑based lubricants, which can degrade nylon. When storing the trimmer for the off‑season, remove the line from the spool to prevent permanent set, and keep the head in a sealed plastic bag with a desiccant packet to control humidity. Store the trimmer in a dry, temperature‑controlled area away from direct sunlight. These habits keep the bump head feeding reliably year after year.

Frequently Asked Questions

How often should I replace the trimmer line on my Craftsman bump head?

Replace the line whenever it becomes shorter than about 2‑3 inches on each side, or at the start of each mowing season. Frequent heavy‑brush work may require more frequent reloads. (See Also:How To Load Auto Feed Weed Eater)

Can I use a larger diameter line than the manual specifies?

Using a larger diameter than recommended can overload the motor, cause excessive vibration, and prevent the line from feeding. Always stay within the manufacturer’s specified range.

Why does my bump head not release line when I tap it?

Common causes include overfilled spool, wrong winding direction, a damaged eyelet, or a weak spring. Follow the troubleshooting steps in the article to isolate the issue.

Is it okay to run a dual‑line head with only one line loaded?

You can, but the head will be unbalanced, leading to increased vibration and uneven wear. It is better to load both sides or switch to a single‑line head designed for that purpose.

Which line shape cuts the fastest?

Square or star‑shaped line cuts thick weeds fastest, but it also wears the eyelet quicker and may not feed as smoothly in all Craftsman heads. Round line offers the most reliable feed for everyday grass trimming.

How should I store spare trimmer line?

Keep spare line in its original packaging or a sealed container, away from sunlight and moisture. UV exposure makes nylon brittle, reducing its lifespan. (See Also:Which Is Better Echo Or Husqvarna Weed Eater)

Conclusion

Mastering how to wrap Craftsman weed eater string on a bump head transforms a routine chore into a quick, reliable process that keeps your trimmer performing at its best. By understanding the bump‑head mechanism, selecting the appropriate line, following the precise winding steps, and applying the maintenance tips outlined above, you will minimize downtime, reduce line waste, and achieve a cleaner cut every time you tackle the yard. Remember to respect safety precautions, avoid common winding mistakes, and troubleshoot feeding issues promptly. With consistent practice, reloading the bump head becomes second nature, letting you focus on the results—a neatly trimmed lawn and a well‑maintained tool ready for the next job.