Introduction
Reloading the cutting line on a Stihl weed eater is a routine maintenance task that keeps your trimmer performing at its best. Whether you are a homeowner tackling a weekend yard project or a professional landscaper who relies on the tool daily, knowing how to reload Stihl weed eater string correctly saves time, reduces frustration, and extends the life of the trimmer head. This guide walks you through every aspect of the process, from identifying the type of head on your model to executing a clean, tangle‑free reload. By the end you will feel confident handling any Stihl trimmer head and be equipped with tips that prevent common pitfalls.
- Understanding Your Stihl Weed Eater
- Types of Stihl Trimmer Heads
- Tools and Materials Needed
- Safety Precautions
- Step‑by‑Step Guide to Reload String
- Detailed Steps for Fixed‑Line Head
- Detailed Steps for Bump‑Feed Head
- Detailed Steps for Auto‑Feed Head
- Common Mistakes and How to Avoid Them
- Tips for Longer Line Life
- Comparison Table: Fixed‑Line vs Bump‑Feed vs Auto‑Feed
- Maintenance After Reloading
- Frequently Asked Questions
- Conclusion
Understanding Your Stihl Weed Eater
Stihl produces a wide range of string trimmers, from lightweight battery‑powered models like the FSA 56 to heavy‑duty gas units such as the FS 240. Despite differences in power source, the line‑loading mechanism is largely determined by the trimmer head rather than the engine. Before you begin, locate the model number on the housing or the owner’s manual; this tells you exactly which head type you have and which line diameter the manufacturer recommends. Using the correct diameter — typically 0.080 in, 0.095 in, or 0.105 in — ensures proper feed tension and cutting efficiency.
Types of Stihl Trimmer Heads
Stihl trimmer heads fall into three main categories. A fixed‑line head (often called a “spool” or “manual” head) holds a pre‑cut length of line that you wind onto the spool yourself. A bump‑feed head advances line automatically when you tap the head on the ground while the engine is running. An auto‑feed head (sometimes marketed as “Easy‑Feed” or “AutoCut”) uses a spring‑loaded mechanism that releases a set length of line each time the throttle is engaged. Knowing which style you own dictates the exact reloading steps, so identify the head before purchasing replacement line.
Tools and Materials Needed
Gather the following items before you start: a fresh spool of Stihl‑approved trimmer line in the correct diameter, a pair of clean work gloves, a small flat‑head screwdriver (for heads with a retaining screw), and a clean rag to wipe away debris. If your model uses a bump‑feed head with a removable cover, a 5 mm socket or hex key may be required. Having everything at hand prevents interruptions and reduces the chance of contaminating the new line with dirt or oil.
Safety Precautions
Always turn off the engine and disconnect the spark plug wire (or remove the battery) before servicing the trimmer head. Wear safety glasses to protect your eyes from any stray line fragments. Keep the work area well‑lit and free of flammable materials. If you are working on a gas‑powered unit, allow the engine to cool completely to avoid burns. Following these precautions eliminates the risk of accidental starts and injury while you handle the cutting line.
Step‑by‑Step Guide to Reload String
The following high‑level overview applies to all Stihl heads. Subsequent sections break down the nuances for each head type.
- Remove the trimmer head from the shaft (if required by your model).
- Open the head cover or spool retainer according to the head design.
- Discard any old, worn line and clean the spool cavity.
- Cut a length of new line matching the manufacturer’s specification (usually 10–25 ft).
- Wind the line onto the spool in the direction indicated by arrows on the head.
- Leave the recommended tail length (typically 4–6 in) protruding from the eyelets.
- Reassemble the head, ensuring the cover clicks or screws securely.
- Reattach the head to the shaft and reconnect the spark plug or battery.
- Test the trimmer at low speed to verify smooth line feed.
Detailed Steps for Fixed‑Line Head
Fixed‑line heads are the simplest to service. After removing the head, locate the spool release button or unscrew the central knob. Pull the spool out and note the winding direction arrows — usually a clockwise arrow for the upper groove and a counter‑clockwise arrow for the lower groove. Cut two equal lengths of line (or a single length if the head uses a single groove). Insert one end of each line into the anchor holes, then wind each line neatly, keeping tension even to avoid overlaps. When the spool is full, thread the free ends through the eyelets on the head housing, snap the spool back into place, and secure the cover. Double‑check that the line feeds freely by gently pulling the tails.
Detailed Steps for Bump‑Feed Head
Bump‑feed heads have a spring‑loaded spool that advances line when the head is tapped. Begin by removing the head cover — often a twist‑off cap or a screw‑on ring. Extract the spool and discard any remaining line. Inspect the spring and the feed pawl for wear; replace if they appear deformed. Cut a single length of line (typically 20–25 ft) and insert one end into the spool’s anchor hole. Wind the line tightly in the direction of the arrow, maintaining a consistent layer. Leave about 5 in of line extending from the spool’s exit port. Reinstall the spool, compress the spring, and replace the cover, ensuring the bump knob moves freely. Tap the head on the ground a few times while the engine runs to confirm proper feed.
Detailed Steps for Auto‑Feed Head
Auto‑feed heads (e.g., Stihl AutoCut) use a centrifugal mechanism that releases a preset length of line each time the throttle is opened. These heads usually have a removable spool cartridge. Open the cartridge by pressing the release tabs, then pull out the old spool. Clean any grass buildup from the cartridge interior. Insert a new pre‑wound spool — Stihl sells factory‑wound cartridges that eliminate manual winding — or wind your own line following the same arrow direction as the fixed‑line head. If winding manually, keep the line taut and avoid crossing strands. Snap the cartridge back into the head housing, making sure the retaining clips engage fully. Start the trimmer and engage the throttle; the head should automatically extend line to the correct length.
Common Mistakes and How to Avoid Them
One frequent error is using the wrong line diameter, which causes either excessive drag (too thick) or premature breakage (too thin). Always consult the owner’s manual for the exact spec. Another mistake is winding the line in the wrong direction; this leads to line feeding backward or jamming. Follow the arrows on the spool or head housing precisely. Over‑filling the spool creates tension that can snap the line or damage the feed mechanism — stop winding when the spool is about 80 % full. Forgetting to leave the proper tail length results in the line not reaching the cutting eyelet, so measure the recommended 4–6 in before reassembly. Finally, neglecting to clean the head before reloading allows debris to interfere with the feed spring or pawl, causing erratic line advance.
Tips for Longer Line Life
- Choose a high‑quality, round‑profile line for general trimming; twisted or serrated lines cut faster but wear quicker.
- Store spare line in a cool, dry place away from direct sunlight to prevent UV degradation.
- Trim at the lowest effective RPM; excessive speed generates heat that weakens the line.
- Avoid forcing the trimmer into dense, woody stems — use a blade attachment for that material.
- Periodically lubricate the bump‑feed spring with a light silicone spray to maintain smooth operation.
Comparison Table: Fixed‑Line vs Bump‑Feed vs Auto‑Feed
| Feature | Fixed‑Line Head | Bump‑Feed Head | Auto‑Feed Head |
|---|---|---|---|
| Line Loading | Manual winding required | Manual winding, then bump to advance | Pre‑wound cartridge or manual wind; auto advances |
| Ease of Use | Simple but time‑consuming | Moderate; requires tapping | Easiest; hands‑free operation |
| Line Control | Full control over length | Controlled by bump frequency | Preset length per throttle engagement |
| Typical Applications | Light residential use | General residential & commercial | Heavy commercial, high‑volume work |
| Maintenance | Low; occasional spool cleaning | Spring and pawl inspection needed | Cartridge replacement; internal mechanism service |
Maintenance After Reloading
After you have successfully reloaded the string, run the trimmer at idle for a minute to let the line settle. Inspect the head for any wobble or unusual vibration, which could indicate a mis‑seated spool or a damaged drive shaft. Clean the air filter and check the spark plug (or battery contacts) as part of a routine post‑service checklist. Lubricate the gearbox according to the service interval in the manual — typically every 25 hours of operation. Keeping a maintenance log helps you track line consumption and anticipate when the next reload will be needed.
Frequently Asked Questions
How often should I reload the line?
Line life varies with cutting conditions, but a typical residential user reloads every 2–4 hours of active trimming. Heavy commercial use may require reloading every hour.
Can I use any brand of trimmer line?
While many aftermarket lines fit Stihl heads, using Stihl‑approved line guarantees the correct diameter, material quality, and feed compatibility. Off‑brand line can cause jamming or premature wear.
Why does my line keep breaking?
Common causes include using line that is too thin for the head, winding the line too loosely, hitting hard objects like rocks or curbs, and operating at excessively high RPM. Address each factor to reduce breakage.
Do I need to remove the head to reload?
On most Stihl models you can reload without detaching the head from the shaft, but removing the head provides better access and reduces the chance of dropping parts into the engine housing.
What is the correct line length for a fixed‑line head?
Most fixed‑line heads require 10–15 ft per groove. Check the specific model’s manual; over‑filling can cause feeding problems.
Conclusion
Mastering how to reload Stihl weed eater string empowers you to keep your trimmer running smoothly throughout the season. By identifying your head type, gathering the right tools, observing safety protocols, and following the step‑by‑step instructions for fixed‑line, bump‑feed, or auto‑feed heads, you eliminate guesswork and avoid the most common reloading errors. Regular maintenance — cleaning the head, inspecting the feed mechanism, and using the proper line diameter — extends both line life and overall trimmer performance. With these practices in place, you will spend less time wrestling with tangled line and more time achieving a clean, professional‑looking edge on every lawn.