How to Restring a String Trimmer: A Complete Step-by-Step Guide
Restringing a string trimmer involves removing the spool, winding new line onto it in the correct direction, securing the ends, and reassembling the head. While the exact process varies by model (such as bump-feed versus fixed-line heads), the general principles apply to most trimmers. Always consult your specific model’s manual for detailed instructions.
Understanding the String Trimmer Restringing Process
Restringing, or replacing the line, is essential maintenance for any string trimmer (also known as a weed eater or weed whacker). The trimmer line is a consumable part that wears down with use. Using the correct line diameter is critical because it ensures proper cutting performance and prevents damage to the trimmer’s motor or gear head. Most trimmers are designed for a specific line thickness, often ranging from 0.065 to 0.095 inches.
The most common trimmer head is the bump-feed head, which dispenses more line when the user taps the head on the ground. Another type is the fixed-line head, where you manually cut and secure short lengths of line. Some newer models use pre-wound cartridges. This guide focuses primarily on the universal steps for the widely used bump-feed spool system.
Safety and Preparation Before You Begin
Before you start, always prioritize safety. Disconnect the power source completely to prevent accidental startup. For battery-powered trimmers, remove the battery. For corded electric trimmers, unplug the cord. For gas-powered models, ensure the engine is off and cool.
Gather the necessary materials and tools:
- Replacement trimmer line of the correct diameter for your model.
- Scissors or line cutters to trim the line to length.
- A small flat-head screwdriver or pliers (sometimes needed to release spool tabs or remove the head cap).
- Clean rags to wipe debris from the spool housing.
Cleaning the area around the spool housing before you begin prevents dirt and grass from interfering with the new line.
Step-by-Step Guide to Restringing a Bump-Feed Trimmer
Follow these general steps for most bump-feed trimmer heads. Look for directional arrows or diagrams on your spool, as they provide model-specific guidance.
Step 1: Remove the Old Spool or Trimmer Head
Locate the release mechanism on your trimmer head. This is often two tabs on the side of the spool that you press inward, or a cap that unscrews. Press the tabs or unscrew the cap to release the spool from the trimmer head housing. Pull the spool straight out. If there is any remaining old line, unwind and discard it.
Step 2: Clean the Spool Housing
With the spool removed, inspect the housing. Use a rag to wipe away any built-up grass clippings, dirt, or debris. Check that the eyelets (the metal or plastic guides where the line exits) are clear and undamaged.
Step 3: Wind the New Line onto the Spool
This is the most critical step. Look for arrows on the spool indicating the winding direction (usually clockwise). Some spools have two separate chambers for a dual-line head.
- Cut a length of new trimmer line. A common length is 20-30 feet, but check your manual.
- Find the starting notch or anchor point on the spool. Secure the end of the line in this notch.
- Wind the line firmly and evenly onto the spool, following the directional arrow. Keep the coils neat and tight to prevent jamming.
- Leave about 6 inches of line free at the end.
Step 4: Secure the Line Ends in the Spool’s Notches
Once wound, secure the free end of the line into one of the notches on the spool’s outer rim. These notches hold the line in place during reassembly. For dual-line spools, repeat the process for the second line, starting from the opposite anchor point.
Step 5: Reassemble the Trimmer Head and Feed the Line
Insert the wound spool back into the trimmer head housing. Align it correctly and press or screw it into place until it clicks. Feed the secured line ends through the eyelets on the trimmer head. Once through, pull the line to release it from the notches. The line should now be free to spin. Test the bump-feed mechanism by gently tapping the head on the ground; the line should advance slightly.
Special Considerations for Different Trimmer Models
The process above is a universal guide, but variations exist. Fixed-line trimmers do not use a spool. Instead, you cut one or two short lengths of line (often 10-15 inches each) and secure them directly in the trimmer head using a clamp or locking mechanism.
For specific brands like Stihl, Husqvarna, or Ryobi, the disassembly method or winding direction may differ. Always refer to the owner’s manual or the manufacturer’s website for model-specific diagrams. Some trimmers use a pre-wound cartridge system, which simplifies the process to a simple swap but can be more expensive.
Troubleshooting Common Restringing Issues
- Line jams or won’t feed: This is often caused by overfilling the spool, winding the line in the wrong direction, or debris in the housing. Re-wind the spool, ensuring it’s not too full and the line is tight.
- Line breaks immediately: The line may be too low quality, the wrong diameter, or you may be using the trimmer on hard surfaces like pavement. Ensure you’re using the manufacturer-recommended line.
- Spool won’t spin: Check that the spool is fully seated and locked into the housing. Also, ensure the line isn’t tangled around the gear head.
Frequently Asked Questions
What is the best way to store extra trimmer line?
Store trimmer line in a cool, dry place away from direct sunlight. UV rays can degrade the line over time, making it brittle. Keeping it in its original packaging or a sealed container helps maintain its flexibility.
Can I use a different diameter line than recommended?
It is not advisable. Using a line that is too thick can overwork the trimmer’s motor, cause excessive vibration, and lead to premature wear. A line that is too thin will break easily and reduce cutting efficiency. Always match the diameter specified in your owner’s manual.
How often should I restring my trimmer?
There is no fixed schedule. Restring whenever the line becomes too short to cut effectively or if it breaks frequently. Regular inspection before each use is good practice.
