Introduction
Learning how to load Stihl weed eater string correctly keeps your trimmer running smoothly and extends the life of the cutting head. The FixCut head, found on many Stihl models, uses a simple spool‑and‑line system that can be reloaded in a few minutes once you understand the mechanism. This guide walks you through every stage, from gathering the right tools to troubleshooting common problems, so you can get back to trimming with confidence.
- Understanding the FixCut Head
- Tools and Materials Needed
- Safety Precautions
- Step‑by‑Step Guide to Load String
- Common String Types and Compatibility
- Troubleshooting Common Issues
- Tips and Best Practices
- Common Mistakes to Avoid
- Maintenance After Reloading
- Frequently Asked Questions
- Conclusion
Understanding the FixCut Head
The FixCut head is a bump‑feed trimmer head that stores a length of nylon line on a spool inside a protective housing. When the line wears down, you tap the head on the ground to advance fresh line. The head consists of three main parts: the outer cover, the spool, and the spring‑loaded bump knob. Knowing each component helps you avoid forcing parts and makes reloading faster. Stihl designs the FixCut head for tool‑free line changes, but a small screwdriver can help pry the cover if it sticks.
Tools and Materials Needed
Before you start, gather the following items:
- Replacement trimmer line (typically .095 in or .105 in diameter for most Stihl models)
- Clean work surface or a sturdy bench
- Gloves to protect your hands from sharp line ends
- Small flat‑head screwdriver (optional, for stubborn covers)
- Owner’s manual for your specific model (for line length specifications)
Having everything at hand prevents interruptions and ensures you use the correct line gauge, which is critical for proper feeding.
Safety Precautions
Always disconnect the spark plug wire or remove the battery before servicing the trimmer. This eliminates accidental starts while your hands are near the cutting head. Wear safety glasses to shield your eyes from any snapped line fragments. Keep the work area clear of bystanders, especially children and pets. If the trimmer has been running recently, allow the engine to cool completely to avoid burns.
Step‑by‑Step Guide to Load String
- Remove the head cover. Press the release tabs on the sides of the FixCut head and lift the cover off. If tabs are tight, gently insert a flat‑head screwdriver to pry them open.
- Take out the spool. Pull the spool straight out of the housing. Note the orientation of the line guide slots; they must face the same direction when you reinstall.
- Clean the spool and housing. Wipe away grass clippings, dirt, and old line fragments with a dry cloth. Debris can cause feeding problems later.
- Cut the new line to length. Consult your manual for the exact length—usually 10–12 feet for a single‑line spool. Cut two equal pieces if your model uses a dual‑line system.
- Insert the line into the anchor holes. Feed one end of each line piece into the designated anchor hole on the spool. Push until the line seats firmly.
- Wind the line evenly. Turn the spool in the direction indicated by the arrow on the spool (usually clockwise). Keep tension steady so the line lays flat without overlapping.
- Leave a short tail. Stop winding when about 6 inches of line remain free. These tails will feed out when you bump the head.
- Reassemble the head. Place the spool back into the housing, align the line guide slots, snap the cover onto the tabs, and give the bump knob a firm tap to seat the line.
Common String Types and Compatibility
Choosing the right line diameter and shape affects cutting performance and head longevity. The table below compares the most common options for Stihl FixCut heads. (See Also:How To Wind Weed Eater String Ryobi)
| Line Diameter | Shape | Best For | Typical Models |
|---|---|---|---|
| .080 in | Round | Light grass, edging | FS 40, FS 45 |
| .095 in | Round | General purpose, medium weeds | FS 55, FS 56, FS 70 |
| .105 in | Round | Heavy brush, thick weeds | FS 80, FS 90 |
| .095 in | Twisted | Reduced vibration, longer life | All FixCut heads |
| .105 in | Serrated | Aggressive cutting, tough stems | Professional series |
Always verify the maximum line diameter listed in your owner’s manual. Using a line that is too thick can jam the spool, while a line that is too thin may break prematurely.
Troubleshooting Common Issues
If the line does not advance after bumping, check these points:
- Ensure the line is wound in the correct direction; reversed winding prevents feed.
- Confirm the line tails are long enough—at least 4–6 inches—to engage the feed mechanism.
- Inspect the bump knob spring for damage; a broken spring will not release line.
- Look for debris lodged in the line guide slots; clean with compressed air if needed.
If the line breaks frequently, consider switching to a twisted or serrated line for added durability, and avoid cutting hard objects like rocks or metal.
Tips and Best Practices
- Store spare line in a cool, dry place to prevent brittleness.
- Wind the line tightly but not so tight that it binds; a smooth, even layer feeds best.
- Replace the line before it wears down to the spool core; this avoids sudden breakage during work.
- Periodically lubricate the bump knob pivot with a light machine oil to keep the feed action smooth.
- Keep the trimmer head clean after each use; grass buildup accelerates wear on the spool and cover.
Common Mistakes to Avoid
- Using the wrong line diameter—always match the specification in the manual.
- Over‑winding the spool, which causes the line to overlap and jam.
- Forgetting to leave sufficient tail length; short tails will not feed.
- Reinstalling the spool upside down; the line guide slots must face the correct direction.
- Skipping the cleaning step; old debris is a leading cause of feed failure.
Maintenance After Reloading
After you have successfully loaded new line, run the trimmer at low speed for a few seconds to verify smooth feeding. Check that the line extends evenly on both sides (for dual‑line heads). Tighten any loose screws on the head cover. Schedule a full inspection of the trimmer head every 25 hours of operation: examine the spool for cracks, the bump knob for wear, and the housing for cracks. Regular maintenance prevents unexpected downtime and keeps the FixCut head performing like new.
Frequently Asked Questions
How often should I reload the line?
Reload whenever the line wears down to about 2 inches remaining on the spool. Frequent users may need to reload every few hours of heavy cutting.
Can I use any brand of trimmer line?
Yes, as long as the diameter and shape match Stihl’s specifications for your model. Quality brands tend to last longer and feed more reliably. (See Also:How To Remove Spool On Dewalt Weed Eater)
Why does the line keep breaking?
Common causes include hitting hard objects, using line that is too thin for the job, or a worn spool with sharp edges. Inspect the spool and switch to a heavier or twisted line if breakage persists.
Do I need to remove the spark plug wire every time?
Yes. Disconnecting the spark plug wire or removing the battery eliminates the risk of accidental starts while your hands are near the cutting head.
What is the correct winding direction?
Most Stihl FixCut spools have an arrow molded on the side indicating clockwise winding. Follow that arrow; winding opposite will prevent line feed. (See Also:How To Restring A Dewalt Battery Weed Eater)
Conclusion
Mastering how to load Stihl weed eater string on a FixCut head is a straightforward process that pays off in smoother operation and longer equipment life. By understanding the head components, using the correct line, following the step‑by‑step loading procedure, and applying the maintenance tips outlined above, you can keep your trimmer ready for any yard task. Regular inspection and proper line selection prevent the most common feeding problems, ensuring you spend more time trimming and less time troubleshooting.