Introduction
Replacing 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 put line on Stihl weed eater models correctly saves time, reduces frustration, and extends the life of the cutting head. This guide walks you through every aspect of the process, from identifying the type of head on your machine to selecting the proper line diameter, and finishes with a clear, step‑by‑step walkthrough that you can follow in the garage or on the job site.
- Understanding Your Stihl Weed Eater Head Types
- Choosing the Right Trimmer Line
- Tools and Safety Gear You’ll Need
- Preparing the Weed Eater for Re‑spooling
- Step‑by‑Step Guide: How to Put Line on Stihl Weed Eater
- Loading a Bump‑Feed Head
- Loading a Fixed‑Line Head
- Loading a Dual‑Line Head
- Comparison Table: Head Types vs. Line Loading Methods
- Tips and Best Practices for Long‑Lasting Line
- Common Mistakes and How to Avoid Them
- Frequently Asked Questions
- Conclusion
Understanding Your Stihl Weed Eater Head Types
Stihl manufactures several cutting‑head designs, and each one requires a slightly different loading technique. The three most common categories are bump‑feed (also called tap‑feed), fixed‑line, and dual‑line heads. A bump‑feed head releases new line when you tap the head against the ground while the engine is running. Fixed‑line heads hold a pre‑cut length of line that you replace manually when it wears out. Dual‑line heads accept two separate strands, providing a wider cutting swath and often a more balanced cut. Identifying which head you have is the first step because the loading procedure, line capacity, and even the recommended line diameter differ between them. Look for a model number on the head housing or consult the owner’s manual; the manual will also list the maximum line diameter the head can accommodate.
Choosing the Right Trimmer Line
Not all trimmer line is created equal. Line comes in various diameters (typically 0.065 in, 0.080 in, 0.095 in, and 0.105 in), shapes (round, square, star, or twisted), and materials (nylon, co‑polymer, or reinforced with aluminum particles). For most residential Stihl models, a 0.080 in round nylon line offers a good balance of durability and cutting efficiency. Professional users who tackle thick brush may prefer a 0.095 in square or star‑shaped line because the edges slice through woody stems more cleanly. Always verify the maximum line diameter printed on the head or in the manual; using a line that is too thick can jam the feed mechanism, while a line that is too thin may break prematurely. Purchase line in bulk spools if you use the trimmer frequently, as this reduces cost per foot and ensures you always have a fresh supply on hand.
Tools and Safety Gear You’ll Need
Before you begin, gather a few basic items: a clean work surface, a pair of heavy‑duty gloves, safety glasses, and a small pair of needle‑nose pliers for stubborn line ends. If your model uses a retaining cap that requires a hex key, keep the appropriate size (usually 4 mm or 5 mm) nearby. A rag or shop towel is handy for wiping away grass debris and oil residue from the head. Most importantly, make sure the engine is completely off and the spark plug wire is disconnected to prevent accidental starts while your hands are near the cutting head. Taking these precautions protects both you and the equipment.
Preparing the Weed Eater for Re‑spooling
Start by placing the trimmer on a stable bench or the ground with the cutting head facing up. Remove any debris, grass clippings, or old line fragments from the head housing using a brush or compressed air. If the head has a removable spool, release the latch or unscrew the retaining cap according to the manufacturer’s instructions. For bump‑feed heads, you may need to depress a release button while pulling the spool out. For fixed‑line heads, simply unwind the old line from the spool. Inspect the spool for cracks, warping, or excessive wear; a damaged spool should be replaced before loading new line to avoid feeding problems later.
Step‑by‑Step Guide: How to Put Line on Stihl Weed Eater
The following ordered list covers the universal steps that apply to most Stihl heads. Specific nuances for each head type are detailed in the subsequent sections.
- Disconnect the spark plug wire to eliminate any chance of accidental ignition.
- Remove the cutting head from the drive shaft if your model allows quick‑release; otherwise, work with the head in place.
- Open the head housing by releasing the latch, unscrewing the cap, or pressing the release button.
- Extract the spool (or the fixed‑line cartridge) and discard any remaining old line.
- Measure the new line according to the head’s capacity—typically 10–15 ft for a single‑line spool and 20–30 ft total for a dual‑line head.
- Insert the line into the anchor hole(s) on the spool, following the directional arrows molded into the plastic.
- Wind the line evenly in the direction indicated (usually clockwise), keeping tension consistent to prevent overlapping or gaps.
- Leave the recommended tail length (usually 4–6 in) protruding from the exit eyelets.
- Re‑install the spool into the head housing, ensuring the line feeds through the eyelets without kinking.
- Secure the head housing by snapping the latch, tightening the cap, or re‑engaging the release button.
- Reconnect the spark plug wire and start the engine. Tap the head gently on the ground (for bump‑feed) to verify proper line advance.
Loading a Bump‑Feed Head
Bump‑feed heads are the most common on Stihl residential trimmers. After opening the head, you will see a spool with two anchor holes opposite each other. Feed one end of the line into the first anchor, pull it through until the tail is about 5 in long, then wind the line in the direction of the arrow—usually clockwise when viewed from the top. Keep the line tight and lay each coil snugly against the previous one; avoid crossing the line over itself. When the spool is full, thread the free end through the exit eyelet on the head housing. Repeat the same process for the second anchor if the head uses a dual‑line bump feed. Once both lines are seated, snap the spool back into the housing, close the latch, and you are ready to test the feed action.
Loading a Fixed‑Line Head
Fixed‑line heads do not have a spool that winds; instead, they use a pre‑cut length of line that sits in a channel around the perimeter of the head. Begin by cutting a piece of line to the length specified in the manual—often around 12 in per side for a single‑line head. Insert one end of the line into the anchor slot, then guide the line around the channel following the molded groove. The line should sit flat without twisting. When you reach the opposite anchor, trim any excess so the line ends are flush with the anchor openings. Some fixed‑line heads have a small retaining clip that snaps over the line to hold it in place; engage this clip if present. Re‑attach the head to the shaft, reconnect the spark plug, and you’re done.
Loading a Dual‑Line Head
Dual‑line heads accept two separate strands, which can be loaded either as a single long piece folded in half or as two individual lengths. The folded‑method is faster: cut a length of line twice the recommended single‑line length (e.g., 20 ft for a head that normally takes 10 ft per side), fold it in half, and insert the looped end into the central anchor hole. Pull the loop through until the two free ends are equal, then wind both strands simultaneously in the direction of the arrow, keeping them side by side. If your head uses separate anchors for each line, treat each anchor as a single‑line spool and follow the bump‑feed winding procedure for each. Dual‑line heads often have a wider exit eyelet; ensure both lines pass through cleanly without binding.
Comparison Table: Head Types vs. Line Loading Methods
| Head Type | Line Capacity (per side) | Loading Method | Typical Line Diameter | Feed Mechanism |
|---|---|---|---|---|
| Bump‑Feed (Single Line) | 10–15 ft | Wind onto spool, anchor holes | 0.080–0.095 in | Tap to advance |
| Bump‑Feed (Dual Line) | 10–15 ft each | Wind two strands simultaneously or folded | 0.080–0.095 in | Tap to advance |
| Fixed‑Line | Pre‑cut 10–12 in per side | Lay line in channel, secure with clip | 0.080–0.095 in | Manual replacement |
| Dual‑Line Fixed | Pre‑cut 10–12 in each | Two separate channels, each with clip | 0.080–0.095 in | Manual replacement |
Tips and Best Practices for Long‑Lasting Line
Using the right technique when loading line can dramatically increase its lifespan. First, always wind the line under slight tension; loose coils create slack that leads to tangling and uneven feed. Second, avoid over‑filling the spool—leave a small gap (about 1/8 in) between the outer coil and the spool flange to allow the line to expand slightly during operation. Third, store spare line in a cool, dry place; exposure to sunlight and moisture degrades nylon, making it brittle. Fourth, periodically clean the head’s exit eyelets with a soft brush to remove grass buildup that can cause the line to snag. Fifth, when cutting heavy brush, use a slower engine speed and let the line do the work rather than forcing the head, which reduces line breakage. Finally, replace the line before it wears down to the core; a worn line cuts poorly and puts extra strain on the motor.
Common Mistakes and How to Avoid Them
One frequent error is using a line diameter larger than the head’s rating, which jams the feed mechanism and can damage the spool. Always double‑check the maximum diameter stamped on the head. Another mistake is winding the line in the wrong direction; the arrows on the spool are there for a reason—reversing them causes the line to feed backward or not at all. Over‑tightening the retaining cap can crack the plastic housing, so tighten only until snug. Some users forget to disconnect the spark plug wire, creating a safety hazard; make this a non‑negotiable habit. Lastly, neglecting to trim the line tails to the recommended length leads to excess line whipping around, which can strike the operator or damage nearby objects. Follow the manual’s tail‑length guideline (usually 4–6 in) for safe operation.
Frequently Asked Questions
What line diameter should I use for my Stihl FS 56 RC?
The Stihl FS 56 RC typically accepts a maximum line diameter of 0.095 in. For general lawn trimming, a 0.080 in round nylon line works well; for thicker weeds, you can step up to 0.095 in square or star‑shaped line.
Can I use any brand of trimmer line, or must it be Stihl branded?
You can use any high‑quality trimmer line that matches the diameter and shape specifications in your owner’s manual. Stihl‑branded line is engineered for their heads, but reputable aftermarket lines (e.g., Oregon, Husqvarna, or generic co‑polymer) perform equally well when the specs match.
Why does my bump‑feed head not advance line when I tap it?
Common causes include a jammed spool, line wound in the wrong direction, or the line being too thick for the head. Open the head, verify the wind direction, ensure the line moves freely, and confirm the diameter is within spec.
How often should I replace the trimmer line?
Replace the line when it wears down to about 1/4 in from the spool core or when cutting performance noticeably drops. For heavy commercial use, this may be every few hours; for occasional residential use, a spool can last several weeks.
Is it necessary to remove the head from the shaft to reload line?
On most Stihl models you can reload line with the head still attached, provided you have enough clearance to open the housing. However, removing the head gives you better access and reduces the chance of dropping small parts into the engine compartment.
What should I do if the line keeps breaking near the eyelet?
Check for sharp edges or burrs on the eyelet that may be cutting the line. Lightly file any rough spots with a fine file. Also ensure you are not using a line diameter that exceeds the head’s rating, as excessive friction at the eyelet causes premature breakage.
Conclusion
Mastering the process of loading new cutting line onto your Stihl weed eater is a straightforward skill that pays dividends in cutting efficiency and equipment longevity. By identifying your head type, selecting the appropriate line diameter, and following the step‑by‑step instructions outlined above, you can confidently tackle the task without guesswork. Remember to observe safety precautions, keep the spool wound evenly, and perform routine inspections of the head and eyelets. With these practices in place, you’ll spend less time troubleshooting line feed issues and more time achieving a clean, professional‑looking trim. The next time you need to know how to put line on Stihl weed eater models, refer back to this guide for a reliable, repeatable workflow.