Maintaining your string trimmer is essential for keeping your yard neat and tidy. One of the most common maintenance tasks is replacing the cutting line. If you’ve never done it before or want to ensure you’re doing it correctly, this guide will walk you through how to replace the line on your string trimmer step-by-step with ease.
Why Replace the Line on Your String Trimmer?
Over time, the cutting line wears down or breaks during use. Using a worn-out line can reduce trimming efficiency and damage your trimmer. Regularly replacing the line ensures optimal performance and extends the life of your tool.
Tools and Materials You’ll Need
Before you begin, gather the following:
- Replacement trimmer line (check your model’s specifications for the correct diameter and length)
- Scissors or a utility knife
- Gloves (optional, for protection)
Step 1: Prepare Your String Trimmer
- Turn off the trimmer and disconnect it from any power source (unplug it or remove the battery).
- Place the trimmer on a flat surface for easy access to the spool.
Step 2: Remove the Spool Cap
Locate the spool housing on the head of your string trimmer. Most models have tabs or screws holding the cap in place.
- Press the tabs or unscrew the cap to remove it.
- Carefully pull out the spool from the housing.
Step 3: Remove the Old Line
- Take out any remaining old line from the spool.
- Clean the spool and the housing area to remove dirt or debris.
Step 4: Wind the New Line
This is the critical part in how to replace the line on your string trimmer step-by-step:
- Cut a length of the new line, usually about 10-15 feet, depending on your trimmer.
- Insert one end of the line into the anchor hole or slot on the spool.
- Wind the line evenly and tightly in the direction indicated on the spool (usually an arrow).
- Leave about 6 inches of line unwound at the end.
Step 5: Reassemble the Spool and Trimmer Head
- Secure the loose end of the line in the notch on the spool.
- Place the spool back into the housing carefully.
- Pull the free end of the line through the eyelet or hole on the trimmer head.
- Snap or screw the spool cap back into place.
Step 6: Test Your String Trimmer
- Reconnect your power source.
- Turn on the trimmer briefly to check that the line feeds correctly and spins freely.
Final Tips for Replacing Your Trimmer Line
- Always use the correct diameter line for your model.
- Avoid overfilling the spool with too much line.
- Replace your trimmer line regularly to maintain efficiency.
Replacing the cutting line on your string trimmer is a straightforward process that anyone can do with the right guidance. By following this step-by-step guide on how to replace the line on your string trimmer step-by-step, you’ll ensure your tool is always ready for the job, helping you keep your lawn looking perfect all season long.

