Introduction
Restringing a Dewalt battery weed eater is a routine maintenance task that keeps your trimmer cutting cleanly and efficiently. Whether you own a 20V MAX model or a more powerful 60V FLEXVOLT unit, the basic process is similar, but there are subtle differences in spool design and line capacity that are worth understanding. This guide walks you through everything you need to know, from identifying when the line is worn to loading fresh trimmer line with confidence. By the end you will be able to answer the question How to Restring a Dewalt Battery Weed Eater? for any model in the lineup.
- Understanding Your Dewalt Battery Weed Eater
- When to Restring
- Tools and Materials Needed
- Safety Precautions
- Step-by-Step Restringing Guide
- Comparison Table: 20V vs 60V Restringing Differences
- Tips for Optimal Line Performance
- Common Mistakes and How to Avoid Them
- Maintenance After Restringing
- Frequently Asked Questions
- Conclusion
Understanding Your Dewalt Battery Weed Eater
20V vs 60V Models
Dewalt offers two primary voltage platforms for their cordless string trimmers. The 20V MAX series is designed for light‑to‑medium residential use, featuring a compact motor and a single‑line spool that holds roughly 10‑15 feet of .065‑inch line. The 60V FLEXVOLT series targets heavier commercial duty, delivering higher torque and a dual‑line bump‑feed head that can accommodate up to 20 feet of .080‑inch or .095‑inch line. Knowing which platform you own determines the line diameter, spool capacity, and the exact loading technique.
Key Components
Every Dewalt battery weed eater shares a few core parts: the motor housing, the trigger and speed control, the shaft, the cutting head assembly, and the replaceable spool. The cutting head on 20V models typically uses a fixed‑line spool that you remove entirely, while many 60V models employ a bump‑feed head that lets you advance line without removing the spool. The spool itself contains a spring‑loaded hub, a line guide, and a retaining cap. Familiarity with these parts makes the restringing process smoother and helps you avoid damaging the feed mechanism.
When to Restring
Line wear is the most obvious indicator that it’s time to restring. If the trimmer starts to leave uncut grass, the line frays, or you hear a “slapping” sound as the line hits the guard, the line is too short or worn. Another sign is reduced cutting speed; the motor may rev higher because the line no longer provides enough resistance. For heavy‑duty 60V units, you may also notice the bump‑feed mechanism failing to advance line, which often means the line has become tangled inside the spool. As a rule of thumb, inspect the line after every 30‑45 minutes of continuous use and replace it whenever the remaining length drops below three inches.
Tools and Materials Needed
Restringing requires only a few basic items, most of which you likely already have in your tool kit.
- Replacement trimmer line (match the diameter recommended for your model: .065‑inch for most 20V, .080‑inch or .095‑inch for 60V).
- Scissors or a utility knife for cutting the line to length.
- Gloves to protect your hands from sharp line ends.
- Safety glasses to shield your eyes from debris.
- A clean rag for wiping the spool and head.
- Optional: a small flat‑head screwdriver if your spool retaining cap uses a screw.
Always purchase line that is labeled “compatible with Dewalt” or meets the same diameter and material specifications. Using the wrong gauge can cause feeding problems or excessive motor strain.
Safety Precautions
Before you begin, remove the battery pack from the trimmer. This eliminates any chance of accidental start‑up while your hands are near the cutting head. Wear safety glasses and gloves throughout the procedure. Work on a stable surface, preferably a workbench or a clean patch of grass, so the spool does not roll away. Keep the trimmer’s guard in place; it protects you from flying line fragments during the test run. Finally, never attempt to restring a hot motor—allow the unit to cool for at least ten minutes after use.
Step-by-Step Restringing Guide
The following ordered list covers the complete restringing process for both 20V and 60V Dewalt battery weed eaters. Follow each step in sequence; skipping a step can lead to line tangles or improper feeding.
- Remove the battery. Press the release latch and slide the battery pack off the tool. This is the single most important safety step.
- Detach the spool. On 20V models, press the two side tabs on the spool cap and pull the spool straight out. On 60V bump‑feed heads, rotate the retaining cap counter‑clockwise until it releases, then lift the spool assembly off the shaft.
- Clear old line. Unwind any remaining line from the spool. Discard the used line; do not attempt to reuse it because it has lost its tensile strength.
- Inspect the spool. Check the spool hub, spring, and line guide for cracks or debris. Wipe them clean with a rag. A damaged spool should be replaced before loading new line.
- Cut new line to length. Measure approximately 12‑15 feet for a single‑line 20V spool, or 20‑25 feet for a dual‑line 60V spool. Cut the line cleanly with scissors; a frayed end makes threading difficult.
- Thread the line. Locate the anchor hole on the spool hub. Insert one end of the line into the hole and pull it through until the line is centered. For dual‑line spools, repeat with the second line in the opposite anchor hole.
- Wind the line. Hold the spool steady and wind the line tightly and evenly in the direction indicated by the arrow on the spool (usually clockwise). Keep tension consistent to prevent overlapping loops. Stop winding when the line reaches the fill line marked on the spool flange.
- Secure the line ends. Tuck the free ends into the retaining notches or slots on the spool flange. This prevents the line from unspooling during operation.
- Reinstall the spool. Align the spool with the drive shaft and press it firmly until the side tabs click (20V) or rotate the retaining cap clockwise until it locks (60V). Ensure the spool spins freely without wobble.
- Reattach the battery. Slide the battery pack back onto the tool until it clicks securely.
- Test the trimmer. Start the motor at low speed, then gradually increase to full throttle. Tap the bump‑feed head on the ground (60V) or pull the trigger (20V) to verify that line feeds smoothly. Adjust the line length if it extends beyond the guard.
Comparison Table: 20V vs 60V Restringing Differences
| Feature | 20V MAX Models | 60V FLEXVOLT Models |
|---|---|---|
| Typical Line Diameter | .065 inch | .080 – .095 inch |
| Spool Type | Fixed single‑line spool | Dual‑line bump‑feed head |
| Line Capacity | 10‑15 ft | 20‑25 ft |
| Removal Method | Press side tabs, pull spool | Rotate retaining cap, lift spool |
| Feeding Mechanism | Manual pull‑trigger advance | Bump‑feed on ground |
| Typical Use Case | Residential lawns, light weeds | Commercial sites, thick brush |
Tips for Optimal Line Performance
Getting the most life out of your trimmer line involves a few habits that go beyond the basic restringing steps.
- Use the correct diameter. Over‑sizing the line forces the motor to work harder and can cause premature wear on the drive shaft.
- Store line in a cool, dry place. UV exposure and moisture make nylon brittle, leading to breakage during operation.
- Wind line under tension. Loose winding creates gaps that cause the line to snag or feed unevenly.
- Trim the line to the guard length. Excess line extends past the cutting guard, increasing drag and reducing cutting efficiency.
- Rotate the spool periodically. On dual‑line heads, swapping the left and right lines every few uses promotes even wear.
- Clean the head after each use. Grass clippings and dirt can accumulate in the feed mechanism, causing the bump‑feed to jam.
Common Mistakes and How to Avoid Them
Even experienced users can fall into traps that make restringing frustrating or damage the tool.
- Forgetting to remove the battery. This is the number one cause of accidental starts. Always double‑check that the battery is detached before touching the spool.
- Using the wrong line gauge. A .095‑inch line in a .065‑inch spool will not feed and can strip the hub threads. Verify the spec on the spool label.
- Over‑filling the spool. Packing line past the fill line prevents the spool from rotating freely and can crack the flange.
- Winding in the wrong direction. The arrow on the spool indicates the correct wind direction; winding opposite causes the line to unwind during operation.
- Neglecting the retaining notches. If the line ends are not secured, they will pull out on the first throttle squeeze, leaving you with no cutting line.
- Skipping the test run. A quick test at low speed reveals feeding problems before you commit to a full job.
Maintenance After Restringing
Once the new line is loaded and tested, a few post‑restringing habits will extend the life of both the line and the trimmer.
- Wipe the cutting head and guard with a dry cloth to remove any dust or grass residue.
- Inspect the battery contacts for corrosion; clean with a soft brush if needed.
- Store the trimmer indoors, away from direct sunlight and extreme temperatures.
- Charge the battery to about 50 % if the tool will sit unused for more than a month; this preserves cell health.
- Periodically check the spool spring tension. A weak spring can cause inconsistent line feed on bump‑feed models.
Frequently Asked Questions
What line diameter should I use for my Dewalt 20V trimmer?
Most Dewalt 20V MAX string trimmers are designed for .065‑inch diameter line. Using a thicker line can overload the motor and cause the spool to jam.
Can I use 60V line on a 20V model?
No. The 60V line is typically .080‑inch or .095‑inch, which is too thick for the 20V spool and motor. Always match the line diameter to the specifications printed on your spool or in the owner’s manual.
How often should I restring my Dewalt battery weed eater?
Inspect the line after every 30‑45 minutes of cutting. Replace it when the remaining length falls below three inches or when you notice fraying, reduced cutting performance, or feeding issues.
Why does my bump‑feed head not advance line after restringing?
Common causes include winding the line in the wrong direction, over‑filling the spool, or debris lodged in the feed mechanism. Verify the wind direction arrow, ensure the line is below the fill line, and clean the head thoroughly.