String Trimmer Spool Replacement: A Quick DIY Guide

string trimmer spool replacement

Replacing the string trimmer spool is a straightforward maintenance task that can significantly improve your trimmer’s performance. This guide will walk you through the five essential steps to replace your string trimmer spool quickly and efficiently, ensuring you get back to maintaining your yard with minimal downtime.

Understanding Your String Trimmer Spool

The spool is a critical component of your string trimmer, holding the cutting line and feeding it out as needed. Over time, spools can wear down, crack, or become damaged, leading to issues like line tangles, inconsistent feeding, or complete failure to dispense line. Recognizing these signs early can prevent more extensive damage to your trimmer head.

Gathering the Right Tools and Parts

Before you begin, ensure you have the correct replacement spool for your specific string trimmer model. Consult your trimmer’s manual or the manufacturer’s website to verify compatibility. You’ll typically need the new spool, a pair of pliers (optional, for stubborn caps), and your owner’s manual for reference. Always ensure the trimmer is unplugged or the spark plug wire is disconnected for safety.

  • Replacement spool (correct model)
  • Pliers (optional)
  • Owner’s manual
  • Safety gloves

Step-by-Step Spool Replacement Process

Our Picks for the Best String Trimmer in 2026
As an Amazon Associate I earn from qualifying purchases.
Num Product Action
1 Cordless String Trimmer Compatible with Milwaukee M18 18V Battery(Tool Only), 12-Inch 3-in-1 Weed Eater with 8500RPM Upgraded Motor, Automatic Line Feed Weed Wacker for Lawn Edging and Mowing-Red Check Cordless String Trimmer Compatible with Milwaukee M18 18V Battery(Tool Only), 12-Inch 3-in-1 Weed Eater with 8500RPM Upgraded Motor, Automatic Line Feed Weed Wacker for Lawn Edging and Mowing-Red on Amazon
2 WORX Cordless String Trimmer & Lawn Edger, 12'' Electric Weed Wacker with 5.5 LBS, 20V Weed Eater with 90° Pivoting Head, Battery & Charger Included, WG170.2 Check WORX Cordless String Trimmer & Lawn Edger, 12'' Electric Weed Wacker with 5.5 LBS, 20V Weed Eater with 90° Pivoting Head, Battery & Charger Included, WG170.2 on Amazon
3 20V 12" Cordless String Trimmer With 2 X 4.0Ah Battery and Charger, Electric Grass Trimmer Battery Powered Eater String, Edger Lawn Tool Grass Cutter With 8pcs Line, Lawn Mover For Garden Yard, Orange Check 20V 12" Cordless String Trimmer With 2 X 4.0Ah Battery and Charger, Electric Grass Trimmer Battery Powered Eater String, Edger Lawn Tool Grass Cutter With 8pcs Line, Lawn Mover For Garden Yard, Orange on Amazon
4 BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp Lightweight Electric Weed Eater (BESTA510) Check BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp Lightweight Electric Weed Eater (BESTA510) on Amazon
5 CRAFTSMAN WEEDWACKER® String Trimmer, 6.5 Amp, 14-Inch (CMEST913) Check CRAFTSMAN WEEDWACKER® String Trimmer, 6.5 Amp, 14-Inch (CMEST913) on Amazon
6 Houselife 12" Cordless Weed Eater Compatible with Dewalt 20V Max Battery (No Battery), Auto Feed Cordless String Trimmer&Weed Wacker, Lightweight Electric 20V Weed Trimmer&Edger for Lawn, Garden, Yard Check Houselife 12" Cordless Weed Eater Compatible with Dewalt 20V Max Battery (No Battery), Auto Feed Cordless String Trimmer&Weed Wacker, Lightweight Electric 20V Weed Trimmer&Edger for Lawn, Garden, Yard on Amazon
7 BLACK+DECKER String Trimmer, Electric, 14-inch (BESTE620) Check BLACK+DECKER String Trimmer, Electric, 14-inch (BESTE620) on Amazon
8 WORX Cordless String Trimmer & Lawn Edger, 12'' Electric Weed Wacker with 4.6 LBS, 20V Weed Eater with 90° Pivoting Head, Batteries & Charger Not Included, WG170.9 Check WORX Cordless String Trimmer & Lawn Edger, 12'' Electric Weed Wacker with 4.6 LBS, 20V Weed Eater with 90° Pivoting Head, Batteries & Charger Not Included, WG170.9 on Amazon
9 Cordless String Trimmer Compatible with Dewalt 20V MAX Battery, 12-Inch Weed Wacker Cordless Auto Line Feed,Electric Weed Eater Battery Powered Grass Trimmer w/6 Line Spools(Tool Only) Check Cordless String Trimmer Compatible with Dewalt 20V MAX Battery, 12-Inch Weed Wacker Cordless Auto Line Feed,Electric Weed Eater Battery Powered Grass Trimmer w/6 Line Spools(Tool Only) on Amazon
10 BLACK+DECKER 20V MAX Weed Eater, Edger and Sweeper Combo, Includes 2 Batteries and Charger, Cordless Electric Weed Wacker and 130 Mph Hard Surface Leaf Blower, 10 in. (LCC222) Check BLACK+DECKER 20V MAX Weed Eater, Edger and Sweeper Combo, Includes 2 Batteries and Charger, Cordless Electric Weed Wacker and 130 Mph Hard Surface Leaf Blower, 10 in. (LCC222) on Amazon

The process typically involves removing the old spool, cleaning the housing, and installing the new one. First, locate the tabs or clips on the trimmer head cap. Press these in or twist the cap counter-clockwise to remove it. Once the cap is off, carefully lift out the old spool. Take note of how the line is wound and oriented, as this will be crucial for installing the new spool correctly.

Installing the New Spool and Testing

With the old spool removed, take a moment to clean any debris, grass, or dirt from the spool housing. This prevents future jams and ensures smooth operation. Now, align the new spool with the housing, making sure the line is threaded through the appropriate eyelets or guides. If your new spool comes pre-wound, ensure the line ends are accessible. Once the spool is seated correctly, replace the trimmer head cap, ensuring it clicks securely into place or is tightened properly. Give the line a gentle tug to confirm it feeds smoothly.

Tips for Extending Spool Life

To maximize the lifespan of your new spool, avoid hitting hard surfaces like concrete or rocks, which can cause premature wear and damage. Store your trimmer in a clean, dry place to prevent material degradation. Regularly inspect the spool for cracks or signs of wear, and replace it proactively when necessary. Using the correct line diameter for your trimmer also reduces stress on the spool mechanism.

Get our weekly buyer guide

Practical specs, not advice. Unsubscribe anytime.

As the founder of ReviewNpicks, I'm dedicated to providing in-depth and reliable information on string trimmers. With 10+ years of experience in the lawn care industry, I've developed a deep understanding of what makes a string trimmer truly effective. My goal is to leverage my knowledge to help both homeowners and professionals choose the best tools for their needs, ensuring they achieve pristine and efficient lawn maintenance.

Get our weekly buyer guide

Practical specs, not advice. Unsubscribe anytime.