Featured Image: [Image of a Stihl trimmer with the string wrapped around the head]
With its efficient design and powerful engine, the Stihl trimmer is an indispensable tool for lawn care and landscaping. Ensuring that it’s properly strung is crucial for optimal performance and efficiency. While it may seem daunting at first, stringing a Stihl trimmer is a relatively straightforward process that can be mastered with the right steps. Whether you’re a seasoned pro or a novice gardener, understanding how to string a Stihl trimmer will enhance your yard work and keep your outdoor spaces looking their best.
Before embarking on the stringing process, gather the necessary materials: a length of Stihl trimmer string, a pair of safety glasses, and a pair of gloves. Additionally, familiarizing yourself with the parts of the Stihl trimmer, such as the trimmer head, spool, and eyelet, will make the task easier. With safety in mind, always wear safety glasses and gloves when handling the trimmer and its components. Once you have everything you need, you’re ready to begin stringing your Stihl trimmer.
To ensure the string is properly aligned and wound onto the spool, follow these steps: Cut the Stihl trimmer string to the appropriate length, typically specified in the owner’s manual. Insert one end of the string into the eyelet located on the trimmer head, then wind the string tightly around the spool in a clockwise direction. Once the string is wound onto the spool, secure it by threading the end through the hole in the trimmer head. With the string properly strung, your Stihl trimmer is ready for action, delivering precise cutting and effortless trimming.
Essential Tools and Materials
Before embarking on the stringing process, it’s crucial to gather the necessary tools and materials. This will ensure a smooth and efficient procedure.
Essential Tools
| Tool | Purpose |
|---|---|
| Protective Gloves | To safeguard your hands from sharp objects |
| Safety Glasses | To protect your eyes from debris |
| Wrench (or Allen Key) | To remove the bump cap and access the spool |
| Fuel Mixture | To power the trimmer (if necessary) |
Essential Materials
| Material | Purpose |
|---|---|
| Trimmer Line | The cutting medium; choose the appropriate thickness and material for your needs |
| Trimmer Spool | The reel that holds and releases the trimmer line |
| Bump Cap | The cover that protects the spool and automatically extends the line when tapped |
With these tools and materials in hand, you’re ready to embark on the stringing process with ease.
Assembling the Trimmer Housing
1. **Inspect Trimmer Head for Damage.** Before assembling the trimmer head, always inspect it for any visible cracks or damage. If any damage is found, replace the trimmer head immediately to ensure safe operation.
2. **Remove the Bolt.** Using a wrench or socket, loosen and remove the bolt that secures the trimmer head to the drive shaft.
3. **Install the Trimmer Head.** Align the trimmer head with the drive shaft and slide it into place. Ensure that the drive shaft aligns with the socket inside the trimmer head.
4. **Tighten the Bolt.** Secure the trimmer head to the drive shaft by tightening the bolt using a wrench or socket. Avoid overtightening, as this can damage the bolt or housing.
5. **Insert the Trimmer Line.** With the trimmer head firmly attached, insert the trimmer line into the holes or slots on the trimmer head. Follow the manufacturer’s instructions for proper line length and winding direction.
6. **Wind the Trimmer Line.** Use the winding mechanism or button on the trimmer head to wrap the trimmer line around the spool. Ensure that the line is wound evenly and securely, following the designated direction and tension indicated by the manufacturer.
7. **Adjust the Trimmer Line Length.** Depending on the trimmer model, there may be an option to adjust the length of the trimmer line. Use the line adjustment mechanism to shorten or lengthen the line as desired before use.
8. **Secure the Trimmer Head.** Once the trimmer line is wound, secure the trimmer head to the shaft by tightening the bolt using a wrench or socket. Again, avoid overtightening.
Installing the Drive Shaft
To install the drive shaft, align the splines on the shaft with the splines on the engine housing. Push the shaft into the housing until it clicks into place. To remove the drive shaft, simply pull it straight out of the housing.
Connecting the Drive Shaft to the String Head
To connect the drive shaft to the string head, unhook the spring from the string head. Insert the square end of the drive shaft into the hole in the string head, and then reconnect the spring. Make sure that the spring is properly seated in the groove on the string head.
Adjusting the Length of the String
To adjust the length of the string, turn the adjustment knob on the string head. Turning the knob clockwise will shorten the string, and turning it counterclockwise will lengthen the string. The optimal length for the string is about 12 inches.
| Length of String | Recommended Use |
| 6-8 inches | Edging and trimming delicate plants |
| 10-12 inches | General trimming and cutting grass |
| 14-16 inches | Clearing heavy brush and weeds |
Mounting the Trimmer Head
To begin, ensure that the engine is turned off and cooled down. Locate the trimmer head, which is usually a circular plastic component at the end of the shaft. Most Stihl trimmers feature a Quick Release™ system for easy head removal.
Grasp the trimmer head firmly and rotate it counterclockwise to detach it from the shaft. Once the head is removed, you can proceed to the next step.
Insert the new trimmer head into the shaft and align it with the corresponding slots. Ensure that the head is fully seated and secure. Turn the head clockwise to tighten it onto the shaft. You will feel some resistance, which is normal as the head tightens into place.
To double-check the tightness, grasp the trimmer head and try to rotate it by hand. If it moves, tighten it further. However, avoid overtightening, as this can damage the threads or the head itself.
Adjusting the Throttle Cable
The throttle cable on a Stihl trimmer controls the speed of the engine. It’s important to adjust the throttle cable properly to ensure that the trimmer runs smoothly and efficiently.
To adjust the throttle cable, follow these steps:
- Start the trimmer and let it run for a few minutes to warm up the engine.
. - Stop the trimmer and disconnect the spark plug wire.
- Locate the throttle cable adjustment screw on the carburetor. It’s usually a small screw with a spring around it.
- Turn the adjustment screw clockwise to increase the idle speed, or counterclockwise to decrease the idle speed.
- Start the trimmer and check the idle speed. The idle speed should be set so that the trimmer runs smoothly without bogging down.
- If necessary, repeat steps 3-5 until the idle speed is correct.
. - Once the idle speed is set, reconnect the spark plug wire and start the trimmer.
- Check the throttle response. The trimmer should accelerate smoothly when you squeeze the trigger.
- If the throttle response is not smooth, readjust the throttle cable.
The following table provides a summary of the throttle cable adjustment procedure:
| Step | Action |
|---|---|
| 1 | Start the trimmer and let it run for a few minutes to warm up the engine. |
| 2 | Stop the trimmer and disconnect the spark plug wire. |
| 3 | Locate the throttle cable adjustment screw on the carburetor. |
| 4 | Turn the adjustment screw clockwise to increase the idle speed, or counterclockwise to decrease the idle speed. |
| 5 | Start the trimmer and check the idle speed. The idle speed should be set so that the trimmer runs smoothly without bogging down. |
| 6 | If necessary, repeat steps 3-5 until the idle speed is correct. |
| 7 | Once the idle speed is set, reconnect the spark plug wire and start the trimmer. |
| 8 | Check the throttle response. The trimmer should accelerate smoothly when you squeeze the trigger. |
| 9 | If the throttle response is not smooth, readjust the throttle cable. |
Connecting the Fuel Line
To connect the fuel line, follow these detailed steps:
1. Locate the Fuel Filter
Identify the small, cylindrical fuel filter located near the carburetor on the engine.
2. Remove the Old Fuel Line
Using a pair of pliers, gently pull the old fuel line off the fuel filter nipple.
3. Measure and Cut New Fuel Line
Measure the length of the old fuel line and cut a new piece of fuel line to the same length.
4. Insert Fuel Line into Grommet
Push one end of the new fuel line into the grommet located on the fuel tank.
5. Connect Fuel Line to Filter
Push the other end of the fuel line onto the fuel filter nipple until it is securely connected.
6. Prime the Fuel System
To prime the fuel system, press the primer bulb located on the carburetor repeatedly until you feel resistance. This will pump fuel into the carburetor and prepare the engine for starting.
| Tools Needed: |
|---|
| Pliers |
| New fuel line |
Inspecting and Tightening Screws
Inspect the screws that hold the trimmer head and shaft together. Ensure they are securely tightened using a screwdriver. Loose screws can cause the trimmer head to wobble or come off during operation, leading to potential safety hazards.
Tightening Screws (Step-by-Step)
Follow these steps to tighten the screws on your Stihl trimmer:
- Locate the screws: Identify the screws that secure the trimmer head to the shaft.
- Check for tightness: Use a screwdriver to check if the screws are already tightened. If they are loose, they will turn easily.
- Tighten screws: Using a screwdriver, carefully tighten each screw until it is snug but not overtightened. Avoid using excessive force to prevent damage to the threads.
- Inspect: Once tightened, inspect the trimmer head to ensure it is firmly attached to the shaft.
Recommended Torque Settings
Refer to the table below for recommended torque settings for tightening the screws on your Stihl trimmer:
| Screw Type | Torque Setting |
|---|---|
| M5 Screws | 5-7 Nm |
| M6 Screws | 8-10 Nm |
Testing the Trimmer
Once you’ve strung your trimmer, it’s important to test it to make sure it’s working properly. Start by holding the trimmer at a slight angle to the ground and pulling the starter cord to start the engine. Slowly increase the speed of the engine until the cutting line begins to spin. If the line is spinning too slowly, you may need to adjust the idle speed of the engine.
Once the line is spinning at the desired speed, hold the trimmer parallel to the ground and gently nudge the cutting line towards a patch of grass. The line should easily cut through the grass without stalling or bogging down the engine. If the line is not cutting properly, you may need to check the sharpness of the line or adjust the angle of the trimmer head.
If the trimmer is working properly, you can begin trimming your lawn or garden. Be sure to hold the trimmer at a slight angle to the ground and keep the cutting line moving in a consistent direction. Avoid pressing too hard on the trimmer, as this can cause the engine to bog down or the line to break.
Troubleshooting the Trimmer
If you’re having trouble with your trimmer, there are a few things you can check:
Is the engine running properly? Make sure the spark plug is clean and properly gapped, and that the air filter is not clogged. If the engine is still not running properly, you may need to take it to a qualified technician.
Is the cutting line spinning freely? If the line is tangled or jammed, it can prevent the trimmer from cutting properly. Check the line for any knots or obstructions, and make sure the spool is not damaged.
Is the trimmer head angled correctly? The trimmer head should be held at a slight angle to the ground to allow the cutting line to cut effectively. If the head is not angled correctly, the line may not make contact with the grass or may cut too deeply.
| Problem | Possible Solution |
|---|---|
| Trimming line is not cutting properly | Check the sharpness of the line. Adjust the angle of the trimmer head. |
| Engine is bogging down | Hold the trimmer at a slight angle to the ground. Reduce the speed of the engine. |
| Trimming line is breaking | Use a heavier line. Reduce the speed of the engine. |
How to String a Stihl Trimmer
Follow these steps to properly string your Stihl trimmer:
-
Ensure the trimmer is turned off and disconnected from the power source.
-
Unlock the trimmer head by pressing the release button.
-
Remove any old string from the head.
-
Cut two pieces of trimmer line, each approximately 10-12 feet long.
-
Insert one end of each line into the holes on the trimmer head.
-
Pull the strings through the holes until the ends meet in the center of the head.
-
Tie the two ends of the string together using a square knot.
-
Wind the strings around the spring inside the trimmer head.
Troubleshooting Common Issues
-
**The trimmer head is not spinning.**
- Check if the trimmer line is properly wound around the spring inside the head.
- Inspect the trimmer line for any tangles or obstructions.
- Make sure the trimmer head is securely fastened to the trimmer shaft.
- Ensure the trimmer is powered on and the engine is running smoothly.
-
**The trimmer is not cutting grass.**
- Check if the trimmer line is long enough to extend beyond the cutting blade.
- Inspect the trimmer blade for any damage or dullness.
- Adjust the trimmer head to the correct cutting height.
-
**The trimmer line is breaking prematurely.**
- Use a thicker gauge trimmer line for heavier cutting tasks.
- Avoid cutting through thick or wet grass, as it can put excessive strain on the line.
- Check if the trimmer head is damaged or if there are any burrs on the cutting blade.
| Line Length | Trimmer Size |
|---|---|
| 10-12 feet | Small trimmers |
| 15-18 feet | Medium trimmers |
| 20-24 feet | Large trimmers |
How to String a Stihl Trimmer
1. Gather your materials: Stihl trimmer, trimmer line, and protective gloves.
2. Disconnect the spark plug for safety.
3. Locate the trimmer head and remove the cover.
4. Remove the old trimmer line from the spool.
5. Cut two new pieces of trimmer line to the desired length.
6. Insert one end of each trimmer line into a hole on the spool.
7. Wrap the trimmer line around the spool in the direction indicated by the arrows.
8. Insert the other end of each trimmer line into the remaining holes on the spool.
9. Reattach the trimmer head cover.
10. Feed the trimmer line through the trimmer head and adjust the length to your preference.
Maintenance and Storage Tips
1. Clean the trimmer head regularly to remove debris.
2. Inspect the trimmer line frequently and replace it when it becomes worn or damaged.
3. Lubricate the trimmer head according to the manufacturer’s instructions.
4. Store the trimmer in a dry, well-ventilated area.
5. Drain the fuel from the trimmer before storing it for extended periods.
Troubleshooting
If you are having trouble with your Stihl trimmer, consult the user manual or contact a qualified repair technician.
Recommended Trimmer Line
Stihl recommends using the following trimmer line for best performance:
| Line Type | Diameter | Length |
|---|---|---|
| Round | 0.080 inches | 20 to 25 feet |
| Square | 0.095 inches | 15 to 20 feet |
How to Successfully String a Stihl Trimmer
To ensure optimal performance, properly stringing a Stihl trimmer is crucial. Here’s a comprehensive guide to help you achieve the best results:
- Unwind the Spool: Unwind the spool’s line by pulling the string gently out of the storage area.
- Align the Holes: Locate the two holes in the spool and align them with the corresponding holes on the trimmer head.
- Thread the String: Insert one end of the string through one of the holes in the spool and out through the opposite hole.
- Tighten the Knot: Pull the string through until a small loop is formed at the bottom of the spool. Then, tighten a knot to secure the line.
- Wind the Spool: Wind the spool according to the direction indicated by the arrows or instructions on the trimmer. Ensure proper tension by winding evenly and tightly.
- Trim the Excess Line: Once the spool is wound, trim any excess line that extends beyond the trimmer head.
- Reinstall the Spool: Place the spooled line assembly back into the trimmer head and ensure it is securely fastened.
People Also Ask About How to String a Stihl Trimmer
How often should I replace the string?
The frequency of string replacement depends on usage and conditions. Generally, it’s recommended to replace the string when it becomes worn, frayed, or breaks.
What type of string is best for my Stihl trimmer?
Stihl trimmers are designed to use specific types of trimmer line, such as round, square, or twisted lines. Refer to your trimmer’s manual for the recommended string size and type.
Can I use any spool with my Stihl trimmer?
No, it is important to use spools specifically designed for your Stihl trimmer model. Using incompatible spools can cause damage or malfunction.
