Fixing Your DeWalt 20V Weed Eater

Kim Anderson

-Nov 2, 2025

Is your DeWalt 20V weed eater not working as it should? Don't worry, you're not alone. Many users experience issues, but with some troubleshooting and basic repairs, you can often get your string trimmer back in action. This guide provides actionable steps, expert insights, and real-world examples to help you diagnose and fix common problems. We'll cover everything from simple fixes to more complex repairs, ensuring you have the knowledge to maintain your DeWalt weed eater and keep your yard looking its best.

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Understanding Your DeWalt 20V Weed Eater

Before diving into repairs, it's essential to understand the basic components of your DeWalt 20V weed eater. This knowledge will help you diagnose problems more effectively.

Key Components:

Motor: The heart of your trimmer, providing the power to spin the cutting string.
Battery: The 20V battery pack that powers the motor. Proper battery maintenance is crucial.
String Head: The part that holds the cutting string. Issues here are very common.
Shaft: The structural component connecting the motor to the string head.
Switch/Trigger: Controls the operation of the trimmer.

Common Problems and Solutions for Your DeWalt 20V Weed Eater

Now, let's explore the most frequent issues and how to resolve them. Remember to always disconnect the battery before performing any repairs.

1. Weed Eater Won't Start

If your DeWalt 20V weed eater doesn't start, the problem usually lies in one of these areas:

Dead Battery: The most obvious cause. Check the battery's charge level and recharge if necessary. Ensure the battery is correctly inserted into the trimmer.
Faulty Switch: Sometimes, the switch or trigger can fail. Try to test the switch with a multimeter to ensure it is working correctly. Replace the switch if needed.
Motor Issues: In rare cases, the motor may be faulty. This could require professional repair or replacement.

2. Weed Eater Runs Intermittently

Intermittent operation can be frustrating. Here are some potential causes and solutions:

Loose Connections: Check all wire connections, especially those near the switch and motor. A loose connection can cause intermittent power.
Battery Problems: A failing battery may provide inconsistent power. Try a different, fully charged battery to see if the issue resolves. Consider a new battery if the problem persists.
Overheating: If the trimmer overheats, it may shut down intermittently. Allow it to cool down and avoid overworking it.

3. Weed Eater String Issues

String issues are very common and often easily fixed:

String Not Advancing: The most frequent problem. Check if the string spool is jammed. If so, clear the jam. Also, make sure that the string is correctly wound.
String Breaking Frequently: Use the recommended string type and diameter for your DeWalt weed eater model. Avoid trimming against hard surfaces.
String Head Problems: The string head may be damaged. Replace the head if necessary.

4. Motor Problems

Motor issues can be more complex to diagnose:

Motor Overheating: If the motor overheats frequently, it could be due to excessive use or an internal fault. Ensure proper ventilation and avoid overloading the trimmer.
Unusual Noises: Grinding or squealing sounds may indicate a failing motor. In this case, professional repair or replacement might be necessary.

Step-by-Step Repair Guide

Let's walk through some common repair steps:

1. Replacing the String

Safety First: Disconnect the battery.
Remove the Spool: Open the string head and remove the old string and spool.
Wind the New String: Follow the manufacturer's instructions to wind the new string correctly onto the spool.
Insert the Spool: Place the spool back into the string head.
Test: Reconnect the battery and test the trimmer.

2. Cleaning and Maintenance

Regular cleaning and maintenance can prevent many issues.

Clean After Each Use: Remove grass, debris, and dirt from the trimmer after each use.
Inspect the String Head: Check the string head for damage or wear.
Lubricate: Lightly lubricate moving parts as recommended in the manual.

3. Troubleshooting the Switch

Disconnect the Battery: Safety first.
Locate the Switch: Find the switch, often near the handle.
Test the Switch: Use a multimeter to test the switch. If it doesn't conduct electricity when pressed, it's faulty and needs to be replaced.
Replace the Switch: Install a new switch.

Expert Tips and Tricks

Use the Right String: Using the correct string type and diameter is essential for optimal performance. Refer to your owner's manual for recommendations.
Proper Battery Care: Store batteries in a cool, dry place. Avoid extreme temperatures. Fully charge the battery before storage.
Regular Inspections: Regularly inspect your weed eater for wear and tear.
Preventive Maintenance: Keep the trimmer clean and well-lubricated.

Professional Assistance

Sometimes, repairs require professional help. Don't hesitate to seek assistance if you are not comfortable performing repairs yourself.

Authorized Service Centers: DeWalt has authorized service centers that can perform complex repairs.
Local Repair Shops: Local small engine repair shops may be able to help. Ensure they have experience with DeWalt products.

Citations

DeWalt Official Website: For specifications and model-specific information.
Consumer Reports: For general power tool troubleshooting tips.
Manufacturer's Manual: For detailed instructions and safety guidelines.

Frequently Asked Questions (FAQ)

1. Why is my DeWalt 20V weed eater not starting?

Common causes include a dead battery, a faulty switch, or motor issues. Check the battery charge, inspect the switch, and if the problem persists, consult a professional.

2. How do I replace the string on my DeWalt weed eater?

Disconnect the battery. 2. Remove the spool. 3. Wind new string correctly onto the spool. 4. Insert the spool back into the head. 5. Test.

3. What type of string should I use?

Use the type and diameter recommended in your owner's manual. Using the wrong string can cause poor performance or damage.

4. How can I prevent my weed eater string from breaking?

Avoid trimming against hard surfaces like concrete or fences. Use the recommended string type and diameter. — Cal Poly Vs. Utah: Where To Watch The Football Showdown

5. My weed eater runs, but the string won't advance. What should I do?

Check for a jammed spool. Clean out any debris and ensure the string is wound correctly. — Yourina OnlyFans Leaked: Understanding The Risks And Staying Safe

6. How do I maintain the battery of my DeWalt 20V weed eater?

Store batteries in a cool, dry place. Avoid extreme temperatures. Fully charge the battery before storage.

7. When should I take my weed eater to a professional?

If you're uncomfortable performing repairs or if the problem is complex (e.g., motor issues), seek professional help at an authorized service center or local repair shop.

Conclusion

By following these troubleshooting steps and repair guides, you can keep your DeWalt 20V weed eater running smoothly. Proper maintenance, understanding common problems, and knowing when to seek professional help are key to extending the life of your trimmer. Always prioritize safety, and don't hesitate to consult the manual or seek professional assistance for more complex issues. With the right care, your DeWalt weed eater will help you maintain a beautiful yard for years to come. In our testing, we found that consistent maintenance significantly reduces the likelihood of breakdowns.