Maintaining a well-manicured lawn requires the proper tools, and a functional weed wacker is essential for taming overgrown grass and weeds. When the string on your Stihl weed wacker wears down or breaks, it’s crucial to restring it promptly to ensure optimal performance. This comprehensive guide will provide you with step-by-step instructions and valuable tips to help you restring your Stihl weed wacker like a pro. Whether you’re a seasoned gardener or a first-time user, this article will empower you with the necessary knowledge and skills to keep your weed wacker operating at its peak.
Before embarking on the restringing process, gather your essential tools and materials. You will need a replacement trimmer line compatible with your Stihl weed wacker model, safety glasses, a pair of gloves, and a flathead screwdriver or hex key (depending on your model’s design). It’s always advisable to refer to your weed wacker’s user manual for specific instructions and safety precautions.
With your tools and materials ready, it’s time to begin restringing your Stihl weed wacker. First, disconnect the spark plug wire to ensure safety during the process. Next, locate the trimmer head and remove it by unscrewing the retaining bolt or nut. Once the trimmer head is detached, you can access the empty spool and remove any remaining string or debris. Carefully unwind the new trimmer line from its packaging, making sure to avoid tangles and knots. Follow the designated path for stringing the line through the spool and eyelet holes, as per your weed wacker’s specific design. Once the line is properly threaded, use the flathead screwdriver or hex key to tighten the retaining bolt or nut securely.
Safety Precautions Before Restringing
Before embarking on the restringing process, it’s paramount to prioritize safety to prevent any mishaps or injuries:
1. Disconnect the Power Source:
This is a crucial step that often gets overlooked. Make sure to unplug the weed wacker from its power source, whether it’s a power outlet or battery. A running weed wacker poses a significant safety hazard during restringing, so always ensure it’s fully powered down.
To safely disconnect the power source:
| For Electric Weed Wackers | For Gas-Powered Weed Wackers |
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2. Wear Protective Gear:
It’s advisable to wear proper protective gear while handling the weed wacker, even during restringing. This includes:
- Gloves: To protect your hands from cuts or abrasions.
- Safety glasses: To shield your eyes from flying debris or sharp line segments.
- Earplugs or noise-canceling headphones: To minimize noise levels and protect your hearing.
3. Allow the Weed Wacker to Cool Down:
If you’ve been recently using the weed wacker, let it cool down for a while before attempting to restring it. This is especially important for gas-powered models, as the engine and muffler can retain heat for an extended period. Handling a hot weed wacker can lead to burns or discomfort.
Gathering Essential Materials
Before embarking on the restringing process, gather the following essential materials:
Line trimmer string
Choose a string diameter and type that is compatible with your Stihl weed wacker model. Common diameters range from 0.080 inches to 0.130 inches, while types include nylon, copolymer, and twisted.
Consider the following factors when selecting string:
– Diameter: Thicker strings offer greater cutting power but are more aggressive on surfaces. Thin strings are less likely to damage delicate vegetation.
– Type: Nylon is the most affordable option, copolymer is more durable, and twisted string combines the strengths of both nylon and copolymer.
Replacement spool
If your Stihl weed wacker uses pre-wound spools, purchase a new spool that is the correct size and shape for your model. Ensure that the spool is empty or has very little string remaining.
Safety glasses
Wear safety glasses during the restringing process to protect your eyes from flying string or debris.
Gloves
Gloves can protect your hands from abrasion and dirt while handling the trimmer string.
Additional Materials
Depending on your specific Stihl weed wacker model, you may need additional materials such as:
– Screwdriver or wrench – Flathead screwdriver – Needle-nose pliers
Note: It is recommended to consult your Stihl weed wacker user manual for specific instructions and recommended materials for your model.
Choosing the Right String Type
Selecting the appropriate string type for your Stihl weed wacker is crucial for efficient operation and optimal performance. There are various factors to consider, including the intended use, string diameter, and material composition.
Intended Use
Consider the nature of the vegetation you will be clearing. For light trimming and edging, a thinner string, typically 0.065 inches or 0.080 inches in diameter, may suffice. For thicker weeds and brush, opt for a thicker string, such as 0.095 inches or 0.110 inches, to ensure adequate cutting power.
String Diameter
String diameter plays a significant role in the weed wacker’s performance. Thinner strings rotate faster, resulting in a cleaner cut but may break more easily when encountering tougher vegetation. Thicker strings offer greater durability and can handle more challenging tasks, but they may produce a coarser cut. The following table outlines the typical string diameters available for Stihl weed wackers:
| Diameter (inches) | Intended Use |
|---|---|
| 0.065 | Light trimming and edging |
| 0.080 | General purpose trimming and edging |
| 0.095 | Tougher weeds and brush |
| 0.110 | Heavier brush and dense vegetation |
Material Composition
Weed wacker strings are typically made from nylon, a durable and cost-effective material. However, other materials, such as copolymer or polyamide, offer additional benefits. Copolymer strings are more flexible and less prone to breaking, while polyamide strings provide superior cutting power and durability.
Removing the Old String
To remove the old string, follow these steps:
1. **Turn off the weed wacker and remove the spark plug.** This is a safety precaution to prevent the weed wacker from starting while you are working on it.
2. **Locate the spool cap.** The spool cap is usually located on the bottom of the weed wacker head. It is typically a round or square cap that is held in place by a few screws.
3. **Remove the spool cap.** Once you have located the spool cap, remove the screws that are holding it in place. The spool cap should then come off easily.
4. **Remove the old string.** The old string is usually wound around the spool. To remove it, simply unwind it from the spool. Be careful not to lose the spring that is located on the spool. The spring is what helps to keep the string in place.
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| If the old string is difficult to remove, you can use a pair of pliers to help you. |
| Once you have removed the old string, be sure to clean the spool and the spool cap. This will help to prevent the new string from getting tangled. |
Preparing the New String
Before you begin restringing your Stihl weed wacker, you need to prepare the new string. This involves cutting the string to the correct length and feeding it through the trimmer head.
1. Cut the String to the Correct Length
The correct length of the string will vary depending on the model of your weed wacker. However, most trimmer heads require a string that is between 18 and 24 inches long. To cut the string, use a sharp knife or scissors.
2. Feed the String Through the Trimmer Head
Once the string is cut to the correct length, you need to feed it through the trimmer head. To do this, first locate the hole in the trimmer head that the string will enter.
3. Thread the String Through the Hole
Once you have located the hole in the trimmer head, take one end of the string and thread it through the hole. Be sure to thread the string in the direction that the arrows on the trimmer head indicate.
4. Wind the String Around the Spool
Once the string is threaded through the hole, you need to wind it around the spool inside the trimmer head. To do this, hold the string taut with one hand and turn the trimmer head with the other hand. Wind the string around the spool in a clockwise direction.
5. Extend the String to the Desired Length
Once the string is wound around the spool, you need to extend it to the desired length. To do this, simply pull the string out of the trimmer head until it reaches the desired length. Be sure to leave about 6 inches of string unwound so that you can tie a knot in the end.
Threading the String through the Head
Threading the string through the trimmer head involves several steps:
1. Remove the Trimmer Head
Depending on the model, twist or unscrew the trimmer head to detach it from the shaft.
2. Unwind and Cut the String
Unwind the old string completely from the spool. Measure and cut two new strings to the specified length, usually around 20-25 feet.
3. Separate and Insert the Strings
Separate the two strings and insert one into each of the holes on the trimmer head. Each string should enter from the outside and feed towards the center.
4. Push the Strings through the Guide Tube
Locate the guide tube inside the trimmer head. Push the strings through the guide tube until they reach the trimmer shaft hole.
5. Feed the Strings through the Shaft
Insert the strings into the shaft hole and feed them through until they reach the desired length. Leave about 6 inches of string protruding.
6. Wind the Strings onto the Spool
To ensure proper loading and consistent string release, follow these steps:
| Step | Description |
|---|---|
| a. | Turn the trimmer head clockwise to wind one string onto the spool. Tighten the spring mechanism by twisting it a few times. |
| b. | Repeat step a with the second string, winding it counterclockwise onto the spool. Tension the spring by twisting it a few times. |
| c. | Continue alternating between the two strings, winding them tightly while keeping the spring tensioned. |
| d. | Once the desired length of string is wound, secure the strings by pushing them into the notches on the spool. |
Winding the String Around the Spool
Follow these detailed steps to wind the string around the spool:
1. Hold the empty spool in one hand and the string in the other.
2. Insert the end of the string into the hole in the center of the spool.
3. Wrap the string around the spool in a clockwise direction, making sure to keep the string taut.
4. Continue wrapping the string around the spool until it reaches the outer edge.
5. Cut the string to the desired length, leaving a few inches of excess.
6. Feed the excess string through the hole in the side of the spool and pull it tight.
7. Advanced Technique for Optimal Performance:
To ensure maximum line life and prevent tangles, employ the following advanced technique:
| Step | Description |
|---|---|
| a) | Create a small loop in the end of the string (approx. 1 inch). |
| b) | Insert the loop into the hole in the spool and wind the remaining string in a counterclockwise direction. |
| c) | This technique creates a “reverse coil” that helps prevent the line from overwinding and reduces tangling. |
Adjusting the String Length
Once the trimmer line is replaced, it’s crucial to adjust the string length for optimal performance. Here are the steps to do it:
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Locate the String Adjuster: Identify the string adjuster, which is usually located on the trimmer head. It could be a knob, a button, or a lever.
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Adjust the Length: Rotate or press the string adjuster to increase or decrease the string length. Aim for a length that’s slightly shorter than the diameter of the trimmer head.
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Use a Measuring Tool: For precise adjustment, use a tape measure or ruler to set the desired string length, ensuring it’s equal on both sides.
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Check the Trim Path: Start the trimmer and check the cutting path. If the string is too long, it may whip and cause damage. If it’s too short, it may not cut effectively.
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Make Gradual Adjustments: Don’t overadjust the string length in one go. Make small adjustments and check the cutting path until you find the optimum length.
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Secure the String: Once the length is set, use the string retainer or other mechanism to keep the string in place.
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Trim Excess String: If there is any excess string extending beyond the trimmer head, use a pair of scissors to trim it flush.
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Regular Maintenance: Check and adjust the string length regularly to ensure optimal cutting performance. As the trimmer line wears down, the string length will decrease, requiring periodic adjustments.
| Recommended String Length | Trimmer Head Diameter |
|---|---|
| 2.5 – 3 inches (63 – 76 mm) | 10 – 12 inches (254 – 305 mm) |
Reassembling the Weed Wacker
Once the trimmer head and gear case are assembled, it’s time to reassemble the weed wacker. Start by aligning the trimmer head assembly with the gear case and inserting the drive shaft into the gear case. Secure the trimmer head assembly with the lock nut.
Step 9: Connecting the Drive Shaft to the Engine
To connect the drive shaft to the engine, you’ll need to first remove the starter cover and locate the drive shaft coupling. Align the drive shaft coupling with the corresponding coupling on the engine and insert it. Secure the coupling with the retaining bolts. Make sure the drive shaft is properly connected to both the engine and the gear case before continuing.
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Once the drive shaft is connected, reinstall the starter cover and torque the bolts to the manufacturer’s specifications. The weed wacker is now reassembled and ready to use.
Troubleshooting Common Issues
1. Line Not Feeding Correctly
Ensure the line spool is not jammed or tangled. Check the feed cord and spring for any damage or blockage.
2. Engine Starts But Stops Immediately
Inspect the fuel line for leaks or damage. Ensure the fuel tank has enough fuel and that it is fresh (less than 30 days old).
3. Engine Overheats
Clean the air filter and spark plug to remove any dirt or debris. Check the muffler for any blockages.
4. Engine Stalls Under Load
Replace the spark plug and clean the carburetor. Check the air filter and replace if necessary.
5. String Breaks Too Often
Use high-quality string and avoid using it in areas with sharp objects. Check the string guide for any wear or damage.
6. Poor Cutting Performance
Inspect the cutting head for any damage or bent blades. Sharpen or replace the blades if necessary.
7. Line Spools Too Fast
Adjust the line spool tension by tightening the spring. Ensure the string is properly wound around the spool.
8. Excessive Vibration
Check the engine mountings for any looseness. Balance the cutting head to reduce vibrations.
9. Line Not Cutting Grass
Ensure the line is long enough and properly extended. Check the cutting head for any damage or misalignment.
10. Engine Does Not Start
Check the spark plug and replace if necessary. Inspect the ignition coil and fuel system for any problems. Ensure the fuel is fresh and the air filter is clean. If the problem persists, contact a professional mechanic.
How to Restring a Stihl Weed Wacker
Restringing a Stihl weed wacker is a relatively simple task that can be completed in a few minutes with the right tools and materials. Here are the steps on how to restring a Stihl weed wacker:
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Remove the old line.
Start by removing the old line from the weed wacker. To do this, simply pull the line out of the spool and discard it. -
Wind the new line onto the spool.
Next, take the new line and wind it onto the spool. Be sure to wind the line in the direction indicated by the arrows on the spool. -
Insert the new line into the head.
Once the line is wound onto the spool, insert the new line into the head. To do this, simply thread the line through the hole in the head and pull it until it is taut. -
Wind the line around the spool.
Next, wind the line around the spool. To do this, simply hold the spool in one hand and the line in the other hand. Then, wrap the line around the spool until it is taut. -
Cut the line.
Once the line is wound around the spool, cut the line to the desired length. To do this, simply use a sharp knife or scissors to cut the line. -
Replace the head.
Finally, replace the head on the weed wacker. To do this, simply line up the head with the body of the weed wacker and push it into place.People Also Ask About How to Restring a Stihl Weed Wacker
How often should I restring my Stihl weed wacker?
You should restring your Stihl weed wacker every 2-3 months, or more often if you use it frequently.
What type of line should I use for my Stihl weed wacker?
You should use a line that is compatible with your Stihl weed wacker. You can find the recommended line type in your weed wacker’s manual.
How do I know if my Stihl weed wacker is out of line?
There are a few signs that your Stihl weed wacker is out of line:
- The line is not feeding properly.
- The line is breaking frequently.
- The weed wacker is vibrating excessively.
