How to Remove Weed Eater Head Stihl? Stihl Head Remove

Introduction

If you own a STIHL string trimmer or weed eater, at some point you will need to remove the cutting head to replace the line, switch to a different cutting attachment, or perform routine maintenance. Knowing how to remove weed eater head Stihl models properly can save you time, prevent damage to your tool, and keep your yard work running smoothly. This guide walks you through every step of the process, from identifying your head type to safely detaching it without harming internal components. Whether you have a bump-feed, auto-feed, or fixed-line head, the instructions below cover the most common STIHL designs and help you avoid the mistakes that lead to stripped gears or broken drive shafts.

Table of Contents

• Why Remove the Weed Eater Head?
• Tools You Will Need
• Safety First: Preparing Your Workspace
• Identifying Your STIHL Head Type
• Step-by-Step Removal Process
• Removing a Bump-Feed Head
• Removing an Auto-Feed Head
• Removing a Fixed-Line Head
• Removing a Multi-Tool Cutting Head
• Head Type Comparison Table
• Troubleshooting Common Problems
• Tips and Best Practices
• Common Mistakes to Avoid
• When to Call a Professional
• Frequently Asked Questions
• Conclusion

Why Remove the Weed Eater Head?

Before diving into the removal steps, it helps to understand why this task comes up so frequently. The cutting head is one of the most exposed parts of your STIHL trimmer, which means it wears out faster than almost any other component. Here are the main reasons users remove the head:

• Line replacement: The nylon line inside bump-feed and auto-feed heads wears down with use. Removing the head makes it easy to reload fresh line.
• Attachment upgrades: Switching from string to a blade, brush cutter, or specialty attachment requires head removal.
• Cleaning and maintenance: Debris, grass clippings, and sap can build up inside the head housing. Taking it off lets you clean thoroughly.
• Damage repair: A cracked housing, jammed line, or seized bearing often means the head must come off for inspection or replacement.
• Seasonal storage: Many users remove the head before long-term storage to prevent moisture buildup and protect internal gears.

Understanding these motivations helps you approach the job with the right mindset and tools, reducing the chance of accidental damage during removal.

Tools You Will Need

Having the right tools on hand makes removal faster and safer. Gather these items before you begin:

• Flathead screwdriver: Useful for prying off retaining clips or releasing tension tabs.
• Phillips-head screwdriver: Some STIHL heads use Phillips screws to secure the housing.
• Socket set or wrench set: A 10mm or 13mm socket often fits the central retaining bolt.
• Gloves: Protect your hands from sharp line ends and dirty surfaces.
• Workbench or stable surface: Work on a clean, flat area to avoid dropping small parts.
• Flashlight or phone light: Helps you see inside the head housing if debris is present.
• Owner’s manual: Always check your specific model number for torque specs and part diagrams.

While some heads can be removed by hand, using the proper tools prevents stripping screws and reduces strain on internal components.

Safety First: Preparing Your Workspace

Never rush into removing a STIHL cutting head without taking a few safety precautions. Follow these steps to protect yourself and your equipment:

1. Disconnect the spark plug wire: Pull the spark plug boot off the plug to prevent accidental starting.
2. Drain excess fuel: If the tank is nearly full, siphon or run the engine until the fuel line is mostly empty to reduce fire risk.
3. Work in a ventilated area: Avoid inhaling fumes from fuel, oil, or grass clippings.
4. Set the tool upright: Place the trimmer on a stable surface or use a vise with soft jaws to hold the shaft steady.
5. Inspect for damage: Look for cracked housings, worn gears, or loose bolts before applying force.

These simple steps eliminate most of the hazards associated with head removal and set you up for a smooth process.

Identifying Your STIHL Head Type

STIHL produces several head styles, and the removal method varies slightly depending on the model. Take a moment to identify yours:

• Bump-feed head: Features a plastic bump knob on the bottom. Tap it on the ground to feed line while operating.
• Auto-feed head: Automatically releases line when the trigger is released. No bump knob required.
• Fixed-line head: Pre-loaded with line that must be manually replaced. Often found on older or budget models.
• Multi-tool head: Accepts various attachments like blades, brushes, or saw blades. Usually has a quick-release mechanism.

Refer to your owner’s manual or STIHL’s online parts lookup tool using your model number if you are unsure. Correct identification prevents wasted effort and potential damage.

Step-by-Step Removal Process

The following general procedure applies to most STIHL weed eater heads. Specific variations are covered in the sections below:

1. Turn off the engine and disconnect the spark plug wire. This is non-negotiable for safety.
2. Place the trimmer on a stable surface. A workbench or sturdy table works best.
3. Locate the central retaining bolt or screw. It is typically at the center of the head and may be covered by a cap or label.
4. Loosen the retaining bolt. Use the appropriate wrench or socket. Turn counterclockwise to loosen.
5. Remove any retaining clips or tabs. Some heads have a plastic clip that must be pressed or pried off before the head lifts away.
6. Pull the head straight up. Do not twist or force it; the spindle should slide off cleanly.
7. Inspect the spindle and gearbox. Check for wear, debris, or damage before installing a new head.
8. Clean the area thoroughly. Remove grass, sap, and old line fragments from the housing.

This sequence works for nearly every STIHL model, but the details differ depending on the head type. The next sections explain those differences in detail.

Removing a Bump-Feed Head

Bump-feed heads are the most common type and are found on popular models like the STIHL FS 56, FS 70, and FS 91 R. Here is how to remove them:

1. Turn off the engine and remove the spark plug wire. Always start here.
2. Flip the trimmer upside down or lay it on its side on a soft surface. This gives you access to the bottom of the head.
3. Locate the central bolt or screw. On most bump-feed heads, it is a 10mm bolt under a small plastic cap.
4. Pry off the plastic cap carefully. Use a flathead screwdriver if needed, but avoid cracking the cap.
5. Use a 10mm socket or wrench to turn the bolt counterclockwise. Hold the head steady with one hand to prevent it from spinning.
6. Once the bolt is fully removed, lift the head straight upward. The line spool should come off with it.
7. Inspect the spindle for debris or damage. Clean it with a wire brush if necessary.

Tip: If the bolt is seized, apply penetrating oil and let it sit for 10 minutes before retrying. Never use excessive force, which can strip the threads.

Removing an Auto-Feed Head

Auto-feed heads are slightly different because they do not have a bump knob. Instead, they use an internal mechanism to advance line. Removal steps include:

1. Disconnect the spark plug wire and secure the trimmer. Same safety protocol applies.
2. Remove the outer housing cover if present. Some auto-feed heads have a snap-on cover that must be pried off.
3. Find the central mounting bolt. It may be recessed deeper than on bump-feed models.
4. Use a socket extension or deep socket to reach the bolt. A standard 10mm socket often works, but longer bolts may require additional tools.
5. Loosen and remove the bolt completely. Keep it in a safe place so it does not roll away.
6. Slide the head assembly off the spindle. It should lift away cleanly once the bolt is gone.
7. Check the auto-feed mechanism for jams. If line is tangled, remove it before reinstalling or replacing the head.

Auto-feed heads tend to accumulate more debris because they run continuously. Regular cleaning during removal helps maintain performance.

Removing a Fixed-Line Head

Fixed-line heads are simpler in design but still require careful removal. These steps apply to models like the STIHL FS 38 and older FS-series trimmers:

1. Safety first: disconnect the spark plug wire. Never skip this step.
2. Turn the trimmer upside down on a soft cloth. This protects the housing from scratches.
3. Locate the retaining screw or bolt. On fixed-line heads, it is often a visible Phillips or hex-head screw.
4. Loosen the screw using the appropriate driver. If it is tight, gently tap the screwdriver handle to break loose corrosion.
5. Remove the screw entirely and set it aside. Some screws are captive and stay attached to the head; others drop out completely.
6. Lift the head straight up to remove it. The fixed line spool should come off with the housing.
7. Examine the spindle and surrounding area for wear. Replace the head if the spool is damaged or the line groove is worn.

Fixed-line heads are the easiest to remove and reinstall, but they also tend to wear out faster due to constant friction against surfaces.

Removing a Multi-Tool Cutting Head

Multi-tool heads accept different attachments such as blades, brushes, or saw blades. These heads usually feature a quick-release mechanism that differs from standard string heads. Here is the typical removal process:

1. Disconnect the spark plug wire and place the trimmer on a stable surface.
2. Locate the quick-release lever or button. It is often on the side of the head or near the central bolt.
3. Press or flip the release mechanism. You may hear a click or feel the tension release.
4. Turn the head counterclockwise while holding the release. Some models require you to twist and pull simultaneously.
5. Once loose, lift the head straight off the spindle. Be careful not to let it drop, as attachments can be heavy.
6. Inspect the quick-release mechanism for debris or damage. Clean it with compressed air if necessary.

Multi-tool heads are designed for versatility, but their mechanisms can jam if not cleaned regularly. Always check the release lever after each use.

Head Type Comparison Table

Choosing the right head for your needs depends on your trimming tasks and maintenance preferences. The table below compares key features of each STIHL head type:

This comparison helps you choose the right head for your workflow and understand what removal challenges to expect.

Troubleshooting Common Problems

Even with careful technique, you may run into issues during head removal. Here are solutions to the most frequent problems:

• Bolt won’t budge: Apply penetrating oil and wait 10–15 minutes. Gently tap the wrench with a hammer to break corrosion. Never use a cheater bar, which can strip the bolt.
• Head stuck on spindle: Wiggle it gently side to side while pulling upward. If it remains stuck, check for a hidden retaining clip or screw underneath.
• Retaining clip broken: Remove all fragments before continuing. A broken clip can jam the spindle or damage the new head.
• Spindle spins freely: Use a locking wrench or vise grip on the flat spots of the spindle to hold it still while loosening the bolt.
• Missing screw or bolt: Refer to your model number and order a replacement from STIHL or an authorized dealer. Do not operate without it.
• Debris jamming the mechanism: Use compressed air or a soft brush to clear grass, sap, and old line from the housing and spindle.

Most problems stem from neglecting routine maintenance. Cleaning the head after each use prevents buildup that leads to these issues.

Tips and Best Practices

Follow these expert tips to make head removal easier and extend the life of your STIHL trimmer:

• Always disconnect the spark plug wire first. This single habit prevents accidental starts and protects your hands.
• Keep a small container nearby for screws and bolts. Losing a tiny part in the grass wastes time and can damage your mower if mowed over.
• Use the correct tool size. Forcing a too-large or too-small wrench damages bolt heads and makes future removals harder.
• Clean the head regularly. A quick wipe-down after each use prevents sap and debris from bonding to plastic parts.
• Store the head in a dry place. Moisture causes corrosion on metal components and degrades plastic housings over time.
• Replace worn line promptly. Short or frayed line reduces cutting efficiency and strains the motor.
• Refer to your owner’s manual. STIHL updates torque specifications and part numbers, so always verify with your exact model.
• Mark the orientation of the head before removal. A small scratch or photo helps you reinstall it correctly.