1. Introduction
This manual provides instructions for the CDIYTOOL SB-864 replacement trimmer spools. These spools are designed for use with specific Greenworks string trimmer models, offering a convenient and efficient solution for maintaining your lawn and garden equipment. Please read this manual carefully before installation and use to ensure proper function and safety.
2. Safety Information
Important Safety Precautions:
- Always wear safety glasses, long pants, and closed-toe shoes when operating a string trimmer.
- Ensure a safe distance from others, pets, and objects while the trimmer is in use.
- Do not operate the trimmer near flammable materials or in hazardous environments.
- Always disconnect the trimmer from its power source before performing any maintenance, including spool replacement.
- Keep hands and feet away from the cutting line and rotating parts.
3. Product Components
Each package contains 12 replacement trimmer spools. Each spool comes pre-wound with 16 feet of 0.065-inch diameter trimmer line.
Figure 1: A package of twelve CDIYTOOL replacement trimmer spools. Each spool features blue trimmer line wound around a black plastic core.
4. Compatibility
These replacement trimmer spools are compatible with the following Greenworks string trimmer models:
- 21222A
- 21602
- 21062
- 21132
- 21242
- 21282
- 21312
- 21302
- 21342
- 21262
- 2100302
They are also compatible with Single Line 24V and G-MAX 40V thread cutting machine models that use a 0.065-inch diameter line.
Figure 2: Visual representation of the trimmer spools fitting various Greenworks trimmer models, highlighting broad compatibility.
5. Specifications
| Feature | Specification |
|---|---|
| Brand | CDIYTOOL |
| Model Number | SB-864 |
| Line Length per Spool | 16 feet (approximately 4.9 meters) |
| Line Diameter | 0.065 inches |
| Material | 70% Nylon + 30% Glass Fiber |
| Color | Blue line, Black spool |
| Quantity | 12 spools per package |
Figure 3: A detailed view of a single trimmer spool, indicating its 0.065-inch diameter and 16-foot line length.
Figure 4: An illustration highlighting the durability and material composition (nylon polyamide) of the trimmer line, noting its round shape for safe use.
6. Setup and Installation
Replacing the trimmer spool is a straightforward process that typically requires no additional tools. Always ensure your trimmer is disconnected from its power source (battery removed or unplugged) before beginning.
- Power Disconnection: Ensure the string trimmer is turned off and disconnected from its power source (e.g., remove the battery pack or unplug the power cord).
- Remove Spool Cap: Locate the spool cap on the trimmer head. Depending on your trimmer model, this may involve pressing release tabs or twisting the cap counter-clockwise to remove it.
- Remove Old Spool: Carefully lift out the empty or damaged spool from the trimmer head.
- Insert New Spool: Take a new CDIYTOOL replacement spool. Ensure the trimmer line is properly secured in the small notch on the spool to prevent it from unwinding prematurely. Align the new spool with the housing and gently place it into position.
- Feed Line Through Eyelet: Guide the end of the trimmer line through the eyelet on the trimmer head. If your trimmer has an auto-feed mechanism, ensure the line is correctly positioned for this function.
- Replace Spool Cap: Reattach the spool cap, ensuring it clicks securely into place or is twisted clockwise until tight.
- Test Line Feed: Briefly connect the power source and activate the trimmer to ensure the line feeds correctly. If the line does not feed, repeat the installation steps.
7. Operating Instructions
Once the new spool is installed, operate your string trimmer according to its original manufacturer's instructions. The CDIYTOOL replacement line is designed for efficient cutting of grass and weeds. Its aerodynamic shape helps reduce drag, contributing to more effective trimming.
Figure 5: A user operating a string trimmer with the replacement spool, demonstrating typical use for edging and trimming.
Figure 6: Another view of a user operating a string trimmer, highlighting the product's effectiveness in cutting grass and weeds.
8. Maintenance
- Storage: Store unused spools in a cool, dry place away from direct sunlight to preserve the line's integrity.
- Inspection: Before each use, inspect the trimmer line for any signs of wear, fraying, or damage. Replace the spool if the line appears compromised.
- Cleaning: Keep the trimmer head and spool area clean from grass clippings and debris to ensure proper line feeding.
9. Troubleshooting
If you encounter issues with your replacement trimmer spool, consider the following:
- Line Not Feeding:
- Ensure the spool is correctly seated in the trimmer head.
- Check if the line is tangled or jammed within the spool.
- Verify that the line is properly threaded through the eyelet.
- The line might be fused together due to heat. Remove the spool, unwind a few inches, and re-thread.
- Excessive Line Breakage:
- Avoid hitting hard surfaces like concrete, rocks, or fences.
- Ensure the line is not too old or brittle (though these are new spools, proper storage is key for future use).
- Check if the trimmer head has any burrs or sharp edges that could be cutting the line.
10. Support
For further assistance or inquiries regarding CDIYTOOL products, please refer to the retailer where the product was purchased or visit the official CDIYTOOL brand store online.
Note: This product does not come with an explicit manufacturer's warranty statement in the provided information. Please consult your retailer for return or exchange policies.





