Introduction
This manual provides instructions for the safe and effective use of your Oregon Trimmer Line Refill, Model 24-518-10. This product is designed for quick and easy installation into the compatible Oregon Head 24-550, ensuring efficient garden and lawn maintenance.

Image: Oregon 3mm Trimmer Line Refills (Model 24-518-10) for Head 24-550.
Safety Information
Always prioritize safety when handling and using power tools and accessories. Adhere to the following guidelines:
- Always wear appropriate personal protective equipment (PPE) such as safety glasses, gloves, and hearing protection when handling trimmer line and operating a string trimmer.
- Ensure the string trimmer is turned off and disconnected from its power source (unplugged or battery removed) before installing or replacing the trimmer line.
- Keep hands and feet clear of the cutting head during operation.
- Store trimmer line in a cool, dry place away from direct sunlight and heat to maintain its integrity.
- Keep out of reach of children and pets.
Package Contents
Your Oregon Trimmer Line Refill package should contain:
- 10 x Oregon Trimmer Line Refills (Disk-shaped, 3mm diameter, 5.52m length each)
Installation Instructions
This trimmer line is designed for quick and easy installation into the compatible Oregon Head 24-550. Follow these steps for proper installation:
- Step 1: Prepare the Trimmer Head. Ensure your string trimmer is powered off and unplugged (or battery removed). Locate the trimmer head (Oregon Head 24-550).
- Step 2: Remove Old Line (if applicable). If there is old line remaining, carefully remove it from the trimmer head.
- Step 3: Insert New Line. The Oregon Trimmer Line Refill is disk-shaped. Insert one end of the new line into the designated opening on the Oregon Head 24-550. Feed the line through until it is centered or until the specified length protrudes from both sides, following the specific loading instructions for your 24-550 trimmer head.
- Step 4: Secure the Line. Ensure the line is securely seated in the trimmer head mechanism.
- Step 5: Verify Installation. Gently pull on the line to confirm it is properly installed and will not easily dislodge during operation.
Refer to your Oregon Head 24-550 manual for detailed instructions on line loading specific to that head model.
Operating Instructions
Once the trimmer line is correctly installed in your Oregon Head 24-550, you can operate your string trimmer according to its manufacturer's instructions. Observe the following general operating practices:
- Always maintain a firm grip on the trimmer during operation.
- Keep bystanders and pets at a safe distance from the operating area.
- Avoid contact with hard surfaces, rocks, or metal objects to prolong line life and prevent damage.
- If the line becomes too short during operation, advance the line as per your trimmer head's design (e.g., bump-feed mechanism or manual advancement).
Maintenance
The Oregon Trimmer Line Refill is a consumable item and requires no specific maintenance other than proper storage and timely replacement.
- Replace the line when it becomes too short, worn, or damaged for effective cutting.
- Regularly inspect the trimmer head for any signs of wear or damage that could affect line performance or safety.
- Store unused line in its original packaging in a cool, dry place, away from direct sunlight and extreme temperatures, to maintain its flexibility and strength.
Troubleshooting
If you encounter issues with your trimmer line, consider the following common solutions:
Line Not Feeding
If the trimmer line is not feeding correctly:
- Ensure the line is installed correctly in the Oregon Head 24-550. Refer to the trimmer head's specific manual for detailed instructions.
- Check for any tangles, knots, or obstructions within the trimmer head mechanism.
- Verify that the line diameter (3mm) is appropriate and recommended for your specific trimmer head model.
- Ensure the line has not fused together due to excessive heat or improper storage.
Line Breaking Frequently
If the trimmer line breaks too often:
- Avoid hitting hard objects such as rocks, fences, concrete, or tree trunks.
- Ensure the line is not excessively long for the trimmer's guard, which can cause undue stress and breakage.
- Inspect the trimmer head eyelets for wear or sharp edges, which can fray and weaken the line.
- Ensure the line is fresh and has been stored correctly. Old, dry, or brittle line is more prone to breaking.
Specifications
| Brand | Oregon |
| Model Number | 24-518-10 |
| Compatible Head | Oregon Head 24-550 |
| Line Diameter | 3 mm (0.118 inches) |
| Line Length (per refill) | 5.52 meters (18.1 feet) |
| Line Type | Disk-shaped |
| Quantity per Pack | 10 refills |
Warranty and Support
For detailed warranty information, product registration, or customer support, please refer to the official Oregon website or contact your local Oregon dealer. It is recommended to keep your purchase receipt as proof of purchase.