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 own a compact FS 56 or a professional‑grade FS 91, the process follows the same basic principles: remove the spent spool, prepare fresh line, wind it correctly, and reinstall the head. This guide walks you through every detail of How to Reload String on Stihl Weed Eater? so you can get back to clean edges and tidy lawns without a trip to the service center.
Table of Contents
- Understanding Your Stihl Weed Eater Head Types
- Tools and Materials Needed
- Safety Precautions
- Step-by-Step Guide to Reload String
- Reloading Specific Models: FS 56, FS 70, FS 91
- Comparison Table: Trimmer Line Types
- Tips for Longer Line Life
- Common Mistakes and How to Avoid Them
- Maintenance Beyond String Reloading
- Frequently Asked Questions
- Conclusion
Understanding Your Stihl Weed Eater Head Types
Stihl trimmers ship with three main head designs. Knowing which one you have determines the exact reloading steps.
Fixed Line Head
A fixed line head holds a single length of line that is trimmed to length each time it wears down. It is simple, lightweight, and common on entry‑level models. Reloading involves pulling the old line out, threading a new piece through the eyelet, and cutting to the recommended length.
Bump Feed Head
The bump feed (or “tap‑and‑go”) head advances line automatically when you tap the head on the ground. Inside, a spring‑loaded spool holds a reserve of line. Reloading requires opening the spool, winding new line in the correct direction, and seating the spool back into the housing.
Auto Feed Head
Auto feed heads use a centrifugal mechanism that releases line as the head spins. They are less common on consumer models but appear on some professional units. The reloading procedure is similar to the bump feed, but you must also verify that the centrifugal pawls move freely after re‑assembly.
Tools and Materials Needed
Gather the following before you start:
- Replacement trimmer line (match the diameter specified in your owner’s manual, typically 0.080 in., 0.095 in., or 0.105 in.)
- Scissors or a sharp utility knife for clean cuts
- Gloves to protect your hands from sharp edges
- Safety glasses
- A clean rag or shop towel
- Optional: a small flat‑head screwdriver for heads with a retaining screw
Using the correct line diameter is critical; an undersized line will break prematurely, while an oversized line can jam the feed mechanism.
Safety Precautions
Before any maintenance, observe these safety steps:
- Turn the engine off and disconnect the spark plug lead to prevent accidental starts.
- Allow the cutting head to cool completely if the trimmer was recently used.
- Wear safety glasses and gloves at all times.
- Work on a stable, flat surface with good lighting.
- Keep bystanders, especially children and pets, at a safe distance.
Following these precautions eliminates the risk of injury from rotating parts or sharp line ends.
Step-by-Step Guide to Reload String
The following ordered list covers the universal procedure for bump‑feed and auto‑feed heads, which are the most common on Stihl trimmers.
1. Remove the Spool
Press the two release tabs on the sides of the head simultaneously, then pull the spool straight out. On models with a retaining screw, loosen the screw with a flat‑head screwdriver before lifting the spool.
2. Clean the Head
Wipe the interior of the head housing and the spool with a rag. Remove any grass clippings, dirt, or old line fragments that could impede the feed mechanism.
3. Measure and Cut New Line
Consult your manual for the exact length; a typical bump‑feed spool requires 10–12 feet of line. Cut the line cleanly with scissors or a utility knife. Avoid frayed ends, as they can catch inside the spool.
4. Load the Line onto the Spool
Insert one end of the line into the anchor hole on the spool. Wind the line tightly and evenly in the direction indicated by the arrow on the spool (usually clockwise). Keep tension consistent to prevent overlapping loops. Leave about 6 inches of line protruding from the exit eyelet.
5. Reinstall the Spool
Align the spool’s notches with the tabs on the head housing, then push the spool in until it clicks securely. If your model uses a retaining screw, tighten it just enough to hold the spool without stripping the threads.
6. Test the Feed
Reconnect the spark plug lead, start the engine, and gently tap the head on the ground. The line should advance smoothly. If it does not, repeat steps 1–5, paying close attention to winding direction and tension.
Reloading Specific Models: FS 56, FS 70, FS 91
While the core steps remain identical, minor variations exist across popular Stihl models.
- FS 56 – Uses a compact bump‑feed head with a single release tab. The spool holds 10 ft of 0.080 in. line. No retaining screw is present.
- FS 70 – Features a larger bump‑feed head with dual tabs and a retaining screw. Accepts 0.095 in. line; the spool capacity is 12 ft.
- FS 91 – Professional model equipped with an auto‑feed head. The centrifugal pawls must be inspected for free movement after reloading. Uses 0.105 in. line, 15 ft per spool.
Always verify the line diameter and length in the model‑specific manual before purchasing replacement line.
Comparison Table: Trimmer Line Types
| Line Shape | Diameter (in.) | Best For | Durability |
|---|---|---|---|
| Round | 0.080 – 0.105 | General residential trimming | Moderate |
| Square | 0.095 – 0.105 | Thick weeds, heavy brush | High |
| Twisted | 0.080 – 0.095 | Reduced vibration, quieter operation | Moderate |
| Serrated | 0.095 – 0.105 | Aggressive cutting, tough stems | High |
Choose a line shape that matches the vegetation you tackle most often. Square and serrated lines cut faster but wear the head slightly quicker.
Tips for Longer Line Life
- Store replacement line in a cool, dry place; UV exposure makes nylon brittle.
- Cut line at a 45° angle to reduce fraying when it exits the eyelet.
- Avoid forcing the trimmer through dense, woody stems; let the line do the work.
- Periodically lubricate the spool’s axle with a light silicone spray to keep the feed smooth.
- Inspect the head for cracks or worn tabs before each reload; a damaged head will not feed correctly.
Common Mistakes and How to Avoid Them
- Winding the line in the wrong direction – Follow the arrow on the spool; reverse winding causes the line to jam.
- Over‑filling the spool – Excess line creates bulk that prevents the bump mechanism from advancing.
- Using the wrong diameter – Undersized line snaps; oversized line binds. Match the manual specification exactly.
- Neglecting to clean the head – Debris buildup leads to uneven feed and premature line breakage.
- Skipping the test tap – Always verify feed operation before returning to work; it saves time later.
Maintenance Beyond String Reloading
Keeping your Stihl weed eater in top shape involves more than just fresh line. Regularly check the air filter, spark plug, and fuel filter according to the service schedule. Clean the cooling fins on the engine to prevent overheating. Lubricate the gearbox (if equipped) with the recommended Stihl gear oil. Sharpen or replace the cutting blade on models that accept a metal blade attachment. A well‑maintained powerhead extends the life of the trimmer head and reduces the frequency of line reloads.
Frequently Asked Questions
How often should I reload the string on my Stihl weed eater?
Reload frequency depends on usage intensity and vegetation type. For typical residential lawn care, expect to reload every 2–4 hours of cutting time. Heavy brush or commercial use may require reloading every hour.
What line size do I need for my Stihl trimmer?
Consult the owner’s manual for the exact diameter. Most consumer models use 0.080 in. or 0.095 in., while professional units often require 0.105 in. Using the correct size ensures proper feed and cutting performance.
My bump feed isn’t advancing line. What should I do?
First, verify that the line is wound in the correct direction and that the spool is not over‑filled. Clean any debris from the head housing. If the problem persists, inspect the spring and pawl for wear; replace the head assembly if components are damaged.
Can I use non‑Stihl brand trimmer line?
Yes, any high‑quality nylon line that matches the required diameter and shape will work. However, Stihl‑branded line is engineered for optimal feed consistency and durability in Stihl heads.
How should I store spare trimmer line?
Keep line in its original packaging or a sealed plastic bag, away from direct sunlight and extreme temperatures. This prevents moisture absorption and UV degradation, both of which weaken the line.
Conclusion
Mastering How to Reload String on Stihl Weed Eater? is a straightforward skill that saves time, money, and frustration. By identifying your head type, gathering the right tools, following the step‑by‑step winding procedure, and observing safety precautions, you ensure reliable line feed every time you tap the head. Selecting the appropriate line shape and diameter for your tasks, avoiding common winding errors, and performing routine powerhead maintenance further extend the intervals between reloads. With this comprehensive guide, you can keep your Stihl trimmer cutting cleanly and efficiently season after season.