How to Change the Line on a Weed Wacker: A Quick Answer
Changing the line on a weed wacker (also called a string trimmer) is a straightforward task that takes about 5–10 minutes. First, ensure the trimmer is powered off and disconnect the spark plug (for gas models) or remove the battery (for cordless models) for safety. Remove the trimmer head by pressing the tabs on the side or unscrewing it, then pull out the old spool and discard the remaining string. Cut a new piece of replacement line to the length specified in your owner’s manual—typically 10–25 feet depending on head design. Feed one or both ends of the line through the holes in the spool, wind it in the direction indicated by the arrows, and leave the correct amount sticking out (usually 4–6 inches). Thread the protruding ends through the eyelets in the head, reinstall the assembly, and give the trimmer a test run.
Understanding Your Weed Wacker: The Basics of a Trimmer Head
Before you begin, it’s helpful to identify the type of trimmer head you have, as the procedure can vary slightly. The main components include the trimmer head housing, the spool (which holds the line), the spool cap, and the line itself. The most common head types are:
- Bump-Feed (or Tap-and-Go) Head: This is the most popular type. You tap the head on the ground while it’s spinning to release more line from the spool automatically.
- Fixed-Line Head: This head uses pre-cut pieces of line that are threaded through and locked in place. There is no spool to wind.
Safety First: Always power off the trimmer completely. For gas trimmers, disconnect the spark plug wire. For electric or battery-powered models, unplug the cord or remove the battery. Wear gloves to protect your hands from sharp line ends and debris.
Key Factors to Consider Before You Replace the Line
Choosing the right replacement line is crucial for performance and to avoid damaging your trimmer.
- Line Diameter (Gauge): Your owner’s manual will specify the correct diameter, often between 0.065 inches and 0.155 inches. Using a line that is too thick can strain the motor or cause the head to jam.
- Line Material: Most lines are made of nylon. Specialty lines may be twisted, serrated, or made of composite materials for tougher weeds. Match the material to your typical yard conditions.
- Line Length: The manual will also specify the length needed to fill the spool. Overfilling can cause jams, while underfilling means you’ll be reloading too soon.
Step-by-Step: How to Remove the Old Line and Spool
Follow these steps to safely remove the old line:
- Remove the Trimmer Head: Most heads are held on by a spring-loaded tab or a screw. Press the tabs on opposite sides of the head and pull it straight off. Some models may require you to unscrew the head.
- Extract the Old Spool: Once the head is off, you’ll see the spool. Pull it straight out of the housing.
- Clear the Old Line: Unwind and discard any remaining line. If the line is tangled or jammed, you may need to use pliers to gently pull it free. Clean out any grass clippings or debris from the spool chamber with a dry cloth.
Step-by-Step: How to Measure, Cut, and Load the New Line
This is the core process, which differs slightly by head type.
For Bump-Feed Heads:
- Cut the Line: Measure and cut a single piece of line to the length specified in your manual (e.g., 25 feet).
- Feed and Wind: Look for the anchor point or hole in the center of the spool. Feed one end of the line through this hole until equal lengths hang from both sides. Wind both strands simultaneously in the direction of the arrows molded into the spool. Keep the line tight as you wind.
- Secure the Ends: When you reach the end of the spool, lock the line into the notches on the spool’s edge. Leave about 4–6 inches of line extending from each side.
- Reassemble: Place the wound spool back into the trimmer head housing. Thread the two line ends through the metal or plastic eyelets on the outside of the head. Snap or screw the head back onto the trimmer.
For Fixed-Line Heads:
- Cut Multiple Pieces: Cut several pre-measured pieces of line (e.g., 10 inches each), as specified by the head design.
- Thread and Lock: Thread one piece of line through an eyelet, pull it through until equal lengths are on both sides, and lock it into the designated slot or notch inside the head. Repeat for other eyelets.
- Reassemble: Once all lines are threaded and locked, reinstall the head onto the trimmer.
Tips, Troubleshooting, and When to Get Help
- Line Won’t Feed: Ensure you wound the line in the correct direction (follow the arrows). Check that the line isn’t tangled in the spool. For bump-feed heads, a weak or broken spring inside the head may need replacement.
- Line Keeps Breaking: You may be using a line that is too thin or low-quality for your yard. Upgrade to a thicker gauge or a more durable material like twisted nylon.
- Line Jams: This often happens if the spool is overfilled. Use only the recommended length. Also, ensure the line ends are threaded properly through the eyelets and aren’t catching on the housing.
- When to Replace More Than Just the Line: If the spool is cracked, the spring is weak, or the eyelets are worn, it’s time to replace the entire trimmer head assembly. Consult your manual or a professional for parts.
Frequently Asked Questions
How often should I replace the trimmer line?
There’s no set schedule. Replace the line whenever it becomes too short to cut effectively or if it breaks. Keeping a spare pre-wound spool on hand can make the process even faster.
Can I use any brand of replacement line?
Yes, as long as it matches the diameter (gauge) and material recommended in your owner’s manual. Using the wrong gauge can damage the trimmer’s motor or head mechanism.
What if my trimmer head doesn’t have arrows showing the wind direction?
Consult your owner’s manual. As a general rule, you should wind the line so that it feeds out in the same direction the trimmer head spins during operation. This is typically clockwise when looking at the head from below.
