How to String a Hart 20v Weed Eater? Easy Step-by-Step Guide

Introduction

Learning how to string a Hart 20v weed eater is a fundamental skill for anyone who wants to keep their yard looking tidy without relying on a professional service. The Hart 20V line trimmer uses a bump‑feed head that requires a specific length and type of line to operate efficiently. When the line wears down or breaks, the trimmer loses cutting power and can even damage the motor if the wrong line is installed. This guide walks you through the entire process, from gathering the right tools to testing the finished job, so you can get back to trimming with confidence.

Whether you are a first‑time owner or a seasoned landscaper, the steps below are written in plain language and include practical tips that prevent common pitfalls. By the end of this article you will know exactly how to string a Hart 20v weed eater, how to choose the correct line diameter, and how to maintain the head for long‑lasting performance.

Table of Contents

• Understanding the Hart 20V Weed Eater
• Tools and Materials Needed
• Safety Precautions
• Removing the Old String
• Preparing the New String
• Step‑by‑Step Stringing Guide
• Adjusting String Length and Tension
• Testing the Weed Eater
• Comparison Table: Hart 20V vs Other Brands
• Tips and Best Practices
• Common Mistakes and How to Avoid Them
• Frequently Asked Questions
• Conclusion

Understanding the Hart 20V Weed Eater

The Hart 20V weed eater is part of Hart’s cordless outdoor power equipment lineup. It runs on a 20‑volt lithium‑ion battery that delivers enough torque for light‑to‑medium residential trimming. The cutting head is a dual‑line bump‑feed system, meaning two strands of line extend from the spool and advance automatically when you tap the head on the ground. This design reduces the need for manual line feeding but still requires periodic replacement of the spool or re‑stringing of the existing spool.

Key specifications that affect stringing include the recommended line diameter (typically 0.080 in or 0.095 in), the spool capacity (about 15 ft of line per side), and the direction of line wind (usually counter‑clockwise when viewed from the bottom). Knowing these details before you start prevents mismatched line that can cause jams or uneven cutting.

Tools and Materials Needed

Before you begin, gather the following items so the job proceeds without interruptions:

• Replacement trimmer line (0.080 in or 0.095 in, 15 ft per side)
• Scissors or a sharp utility knife for cutting line
• Work gloves to protect your hands from sharp edges
• Safety glasses to shield eyes from debris
• A clean rag for wiping the spool and head
• Optional: a small flat‑head screwdriver if the spool retaining cap is tight

Having the correct line diameter is critical. Using a line that is too thick will stall the motor, while a line that is too thin will wear out quickly and may not cut thick grass effectively.

Safety Precautions

Always treat the weed eater as a powered cutting tool. Follow these safety steps before you start any maintenance:

1. Remove the battery pack from the tool to eliminate any chance of accidental start‑up.
2. Wear safety glasses and gloves throughout the procedure.
3. Work on a stable, flat surface with good lighting.
4. Keep the area clear of children and pets.
5. Inspect the spool and head for cracks or excessive wear; replace damaged parts before re‑stringing.

These precautions protect you and ensure the trimmer operates safely once re‑assembled.

Removing the Old String

Start by detaching the cutting head from the shaft. Most Hart 20V models use a quick‑release button near the head; press it and pull the head straight off. Once the head is free, locate the spool retaining cap—usually a knurled knob on the bottom of the head. Turn the cap counter‑clockwise to loosen it, then lift the cap and spool out together.

Pull any remaining line off the spool. If the line is tangled, gently unwind it rather than yanking, which can damage the spool’s internal spring. Clean the spool and the interior of the head with a rag to remove grass clippings and dust that could interfere with the new line’s feed.

Preparing the New String

Cut two equal lengths of replacement line, each about 15 ft (the spool’s rated capacity). If your spool has a marked “max fill” line, stop a few inches short of that mark to allow proper winding. Lay the two strands side by side, aligning the ends. Some users prefer to fold the line in half and feed the loop through the spool’s anchor hole; this creates a secure anchor point and reduces the chance of the line slipping during operation.

If your spool uses a single‑anchor design, thread one end of each strand through the respective anchor holes, then pull the line through until the loop sits snugly against the spool wall. Ensure the line lies flat and does not cross over itself, as crossed line causes uneven feeding.

Step‑by‑Step Stringing Guide

1. Remove the battery – Detach the 20V battery pack to prevent accidental activation.
2. Detach the cutting head – Press the release button and slide the head off the shaft.
3. Open the spool – Unscrew the retaining cap counter‑clockwise and lift the spool out.
4. Clear old line – Pull out any remaining line, clean the spool and head interior.
5. Cut new line – Measure and cut two 15‑ft pieces of the correct diameter.
6. Anchor the line – Insert each strand into its anchor hole or fold a single strand to form a loop anchor.
7. Wind the line – Turn the spool in the direction indicated by the arrow on the spool (usually counter‑clockwise). Keep tension even; avoid overlapping loops.
8. Leave a tail – Stop winding when about 6‑8 in of line remain on each side; these tails will feed out during use.
9. Re‑assemble the spool – Place the spool back into the head, replace the retaining cap, and tighten clockwise.
10. Re‑attach the head – Slide the head onto the shaft until the release button clicks.
11. Re‑install the battery – Snap the battery pack back onto the tool.
12. Test feed – Tap the head lightly on grass; the line should advance smoothly.

Follow each step in order; skipping steps often leads to line jams or uneven cutting.

Adjusting String Length and Tension

After re‑stringing, the length of the exposed line determines cutting width and motor load. The ideal exposed length is roughly 4‑5 in on each side. If the line is too long, the motor works harder and battery life drops; if too short, the trimmer cannot reach the grass. To adjust, pull the line out manually until the desired length shows, then tap the head on the ground to let the bump‑feed mechanism set the tension automatically.

Check that both sides are equal. Uneven line length causes vibration and uneven cuts. If one side feeds faster, re‑open the spool and verify that the line was wound evenly and that the anchor points are seated correctly.

Testing the Weed Eater

With the battery installed, hold the trimmer at a comfortable angle and engage the trigger. Let the head spin up to full speed, then gently lower it onto a patch of grass. The line should cut cleanly without excessive vibration. Listen for any unusual noises—grinding or rattling often indicates a mis‑wound spool or a line that is too thick.

Run the trimmer for a minute, then stop and inspect the line feed. The bump‑feed should have advanced the line a few inches. If the line does not advance, tap the head more firmly or check that the spool spring is functional. A properly strung Hart 20V weed eater will maintain consistent line length throughout a typical yard session.

Comparison Table: Hart 20V vs Other Brands

The table highlights why many homeowners choose the Hart 20V for its balance of weight, line capacity, and dual‑line feed, making the stringing process straightforward compared with single‑line competitors.

Tips and Best Practices

• Always use the line diameter recommended in the owner’s manual; deviating reduces performance and can void the warranty.
• Store spare line in a cool, dry place to prevent brittleness.
• Wind the line tightly but not so tight that it binds the spool spring.
• Periodically clean the head’s air vents to keep the motor cool during extended use.
• Replace the entire spool if the plastic shows cracks; a damaged spool can cause line breakage.
• Keep a spare battery charged so you can finish large yards without interruption.

Following these habits extends the life of both the line and the trimmer.

Common Mistakes and How to Avoid Them

One frequent error is winding the line in the wrong direction. The spool usually has an arrow molded into the plastic; ignore it at your peril. Another mistake is over‑filling the spool, which prevents the bump‑feed from advancing line and leads to a stalled motor. Users also sometimes forget to remove the battery, risking accidental start‑up while their fingers are near the spinning head.

To avoid these issues, double‑check the wind direction before you start, leave a small gap before the max‑fill line, and always disconnect the power source first. If the line still jams after re‑stringing, inspect the spool spring for fatigue and replace the spool if necessary.

Frequently Asked Questions

What line diameter should I use for my Hart 20V weed eater?

The manufacturer recommends 0.080 in line for general trimming and 0.095 in for thicker weeds. Using a larger diameter than specified can overload the motor.

How often should I replace the trimmer line?

Replace the line whenever it wears down to less than 2 in on either side or when cutting performance noticeably drops. For average residential use, this is typically every 2‑3 months.

Can I use pre‑wound spools instead of re‑stringing myself?

Yes, Hart sells pre‑wound spools that snap directly into the head. They save time but cost more per foot of line.

Why does the line not advance when I tap the head?

Common causes include an over‑filled spool, line wound in the wrong direction, or a worn bump‑feed spring. Check each of these items and correct as needed.

Is it safe to string the trimmer with the battery attached?

No. Always remove the battery before performing any maintenance to prevent accidental activation.

Conclusion

Mastering how to string a Hart 20v weed eater empowers you to keep your trimmer running at peak efficiency without costly service calls. By understanding the tool’s specifications, gathering the right materials, and following the step‑by‑step process outlined above, you can replace the line quickly and safely. Remember to observe safety precautions, wind the line in the correct direction, and test the feed before tackling a full yard. With regular maintenance and the best‑practice tips provided, your Hart 20V will deliver clean cuts season after season.