How to String a Grass Trimmer: A Complete Guide for Fast, Reliable Results

Learning how to string a grass trimmer is simpler than it seems. You just need the right line, some basic tools, and clear steps on rewinding the spool. Keep 6 to 20 feet of new string ready.

Leave 4 to 6 inches free at the spool’s end. This setup helps with smooth trimming.

Start by removing any old string and cleaning the trimmer head. Watch how the string winds on the spool. Make sure to secure the last few inches tight.

This prevents the string from slipping. This setup makes your trimmer cut efficiently and prevents the line from tangling or breaking early.

Knowing the type and thickness of line to use is key. Most trimmers work well with .065 to .080 inches thick string.

But check your model for specifics. Keeping the spool vertical while winding helps keep the line tight and neat.

How to String a Grass Trimmer Correctly Step-By-Step

Replacing the string in your grass trimmer helps keep it cutting efficiently. You’ll start by safely removing the old string and spool from the trimmer head.

Then, cut a fresh line and wind it neatly. So it feeds smoothly during use.

Follow these steps to string your grass trimmer correctly. Have your new trimmer line ready, matching the diameter recommended by your machine’s manual. Make sure the trimmer is powered off and unplugged or the battery is removed for safety.

You’ll need a flathead screwdriver to open the trimmer head. Some models require a tool to do this. Check your model before starting.

1. Remove the trimmer head: Unlock or unscrew the trimmer head cover. Some models require pressing tabs or twisting the head counterclockwise. Clean out any debris and old line to prepare for new string.
2. Take out the spool: Gently pull the spool from the head. Note how the old line was wound around it. This will help you wind the new line correctly.
3. Cut the new line: Measure 15 to 25 feet of line. The exact length depends on your trimmer’s spool size. Cut the line cleanly to prevent frays and tangles.
4. Wind the line: Find the arrow on the spool that shows winding direction. Secure one end of the line in the notch on the spool. Roll the line around the spool evenly and tight. Keep the lines side by side. Avoid overlapping the line.
5. Thread through the eyelets: Pull both ends of the line through the eyelets. Make sure the line is even on both sides. Leave about 6 inches of line extending from each hole.
6. Secure the line on the spool: Snap the line ends into the notches. This holds the line tightly in place. This stops the line from unraveling before you reassemble the trimmer head.
7. Reassemble the trimmer head: Place the spool back in the head. Match the arrows on the spool with the head’s direction. Tuck the line ends into the eyelets again. Snap or screw the head cover back on tightly.

Make sure the spool moves freely when you pull on the lines. Lines stuck together or wound backwards can cause feeding problems. Check for too much line if the spool won’t fit or close.

Also look for tangled string causing issues. Proper winding and securing keeps your trimmer working smoothly. It prevents extra stops to fix the line.

Which Trimmer Line Types and Thicknesses Should You Use?

Choose a trimmer line based on your grass type, trimmer model, and cutting needs. Round lines work well for regular grass. You’ll want thicker or shaped lines for tough weeds and thicker stems.

Overview of Common Line Shapes and Uses

Round lines are the most common and easiest to wind on the spool. They work well for cutting regular lawn grass but struggle with thicker weeds. Twisted lines provide stronger cutting power and run quieter, making them suitable for tougher grass types.

Serrated or star-shaped lines deliver sharp edges that cut heavy weeds and thick stems more easily. The downside is they wear out faster and can be more expensive. Using the right shape can make trimming faster and cleaner.

Choose the line shape that matches your yard conditions and trimmer use.

Thickness Recommendations by Trimmer Power and Grass Type

The most common line diameters range from 0.065 to 0.095 inches for residential use. Thin 0.065-inch line suits light trimming and soft grass but breaks quickly on concrete or thick weeds. Medium 0.080-inch line fits most homeowner trimmers and lawn conditions.

For thick grass and tougher weeds, go with 0.095-inch or thicker lines. Larger diameter lines cut better and last longer but may strain smaller or electric trimmers. Check your trimmer manual for the maximum line size before upgrading thickness.

Pick the line thickness that suits your trimmer power and the weeds you face.

Compatibility Tips for Popular Trimmer Brands

Not all trimmer lines fit every model. Check your manual or manufacturer’s website for recommended line diameter and type. Some models handle thicker line but may ship with a smaller diameter for light jobs.

Single-line trimmers such as the BLACK+DECKER 20V MAX EASYFEED use lines up to 0.080 inch thick. Husqvarna trimmers commonly handle thicker 0.095-inch lines for heavy-duty trimming. Using incorrect line thickness can cause the spool to jam and put stress on the motor.

Use the line size your trimmer manual says. This avoids damage to your tool. It also keeps your trimmer working well.

Tools and Materials Needed Before Restringing Your Trimmer

Before you restring your grass trimmer, gather the right tools, trimmer line, and safety gear. Having these ready makes the process faster and safer. It also helps avoid damage or injury.

Essential Tools for Most Trimmers

You generally need a few basic tools to take off the trimmer head or spool cover. A screwdriver or a small wrench often works, depending on your model. Some trimmers have a quick-release system, which means no extra tools are required.

Besides tools for opening the head, keep a clean cloth handy. Use it to wipe away dirt and grease quickly. This helps keep your tools working well.

It ensures the spool winds smoothly and avoids jamming. Also, keep a small container nearby to hold screws or parts so they don’t get lost.

Selecting the Right Replacement Line

Check your trimmer’s manual for the correct diameter and type of trimmer line. Using the wrong size can cause poor cutting or even damage the trimmer. Most homeowners use lines between 0.065 and 0.095 inches thick.

You can buy pre-wound spools or cut your own line to the needed length. Some lines are round, while others are square or twisted shapes.

The shape affects cutting power and noise. So match your line to your work needs and trimmer type.

• Check the manual for line diameter and shape
• Buy pre-wound spools for ease or loose line to wind yourself
• Use lines approved for your electric or gas model
• Keep several spools handy to avoid delays
• Store lines in a cool, dry place to prevent brittleness

Choosing the right line ensures your trimmer runs efficiently and lasts longer. Using off-brand or wrong thickness lines risks jamming and increased wear.

Safety Gear to Protect Yourself

Your eyes and hands need protection when restringing and using a trimmer. Always wear safety glasses to shield your eyes from flying debris and line snapback. Thick work gloves prevent cuts and scrapes while handling the line and parts.

Keep long sleeves and pants on to protect skin from flying bits when trimming. Noise can be loud.

So wearing ear plugs or earmuffs is wise, especially with gas trimmers. Turn off and unplug the trimmer or remove the battery before restringing.

• Safety glasses or goggles
• Thick work gloves
• Long sleeves and pants
• Hearing protection for noisy models
• Ensure the trimmer is powered off before starting

Following these safety steps reduces injury risk during restringing. It also prepares you to use the trimmer more confidently.

How to Wind and Secure Trimmer Line the Right Way

Wind the trimmer line in the direction of the arrow on the spool. This arrow matches the head’s rotation direction during trimming. Winding against that arrow causes tangles and poor feeding.

Keep the line tight as you wind. Hold the spool firmly in one hand while wrapping the line with the other. Loose winding can cause the line to slip or bunch up inside the spool.

After winding, you need to secure the line ends. Place each end of the string into the small notches on the spool’s edge. These notches prevent the line from unraveling before you reinstall the spool.

• Follow the arrow stamped on your spool to wind the line.
• Use firm tension but don’t overstretch the string.
• Leave about 6 inches of line free outside the notches.
• Insert line ends into spool notches to lock them in place.
• Feed the line ends through the eyelets or holes in the trimmer head.
• Check for two equal lengths if using dual-line trimmers.
• Tuck the line ends properly before closing and locking the cap.

Securing the line ends well stops unraveling during use. You don’t want the line spilling out when the spool spins fast. Also, make sure you feed the line through the trimmer head’s eyelets before sealing the cap.

If your trimmer uses dual lines but the spool has only one hole, pull the string until it divides equally on both sides. That keeps the line balanced and feeds smoothly. Checking these small points saves time and frustration in the yard.

Differences Between Single-Line, Dual-Line, and Bump Feed Heads

Trimmer heads come in single-line and dual-line types. Each type changes how you restring the line. You need to know the difference for proper upkeep.

Single-line heads use one piece of string, which winds through one slot. Dual-line heads hold two pieces of string. So you split your line into two equal parts and wind each separately.

Dual-line heads cut wider areas fast. They speed up trim jobs a lot. But they take more time to restring.

Bump feed heads have a knob or bumper on the bottom. You tap this knob on the ground to feed more line. It’s a simple way to control line feed.

This action releases more line automatically while you’re trimming. To restring bump feed heads, thread line through the holes. Make sure the arrows on the knob match the eyelets.

This keeps the line feeding properly. It’s important to keep line lengths equal on both sides. Bump feed heads need more hands-on control than automatic ones.

They are easier to fix if the line jams. This saves you time in repairs.

Single-line heads are usually simpler and cheaper. They take less time to restring but cut a narrower path. Dual-line heads cut more grass per pass and make trimming near edges easier.

They need two equal lengths of line cut and wound properly. You must keep line lengths matched.

Otherwise, the line can jam or wear unevenly. This causes trimming problems.

With bump feed heads, you need to first remove old line. Feed new line through the eyelets carefully. Keep the bump knob arrows lined up with these eyelets.

This avoids line feed issues. This alignment keeps line feeding smooth and prevents jams. You wind the line carefully around the spool in the right direction before reassembling the head.

Bump feed heads usually cost less than automatic ones. They require tapping the knob on the ground to feed line. This means more work as you trim.

Always cut your line to the recommended length. Wind it in the right direction, too. This helps avoid jams during trimming.

Common Mistakes When Restringing and How to Fix Them

One common mistake is winding the trimmer line the wrong way. Check for an arrow on the spool that shows the winding direction. Winding the line against the arrow stops it from feeding right.

It can also cause the trimmer to jam. Follow the arrow direction on the spool.

Using the wrong line thickness also causes problems. Using a line that’s too thick might not fit your trimmer. It can also damage the trimmer head parts.

Too thin line breaks quickly or wears out fast. Check your trimmer’s manual for the right line thickness.

Choose a spool that matches this size. This helps the line wear out slower.

Another issue is putting too much line on the spool. Overloading makes the line tangle under the cover.

That prevents smooth feeding and can damage the head. Use only the amount recommended by the manufacturer, usually around 10 to 15 feet per spool.

• Winding line against the arrow direction
• Using line either too thick or too thin
• Overfilling the spool with too much line
• Failing to secure the line ends in the spool notches
• Forcing the spool back without line properly seated
• Ignoring tangles or twists before reassembling the head
• Using old, brittle, or damaged trimmer line

Before snapping the spool back, hook the line ends on the notches. This keeps the line in place. It stops the line from slipping.

The line will slip if its ends aren’t secured in the notches. This causes tangles inside the spool.

Secure each end tightly before use. Also, check for twists or kinks in the line and straighten them out first.

First, check the line size if it won’t feed or breaks fast. Also, see if the spool is filled properly. This fixes most feeding problems.

Then look for jams inside the head by removing the cover. Clean out any tangled knots or leftover bits.

Replace worn or brittle line with fresh material. Correct winding and secure ends help keep the line feeding smoothly without breaking.

When and How Often to Replace Your Grass Trimmer Line

Your grass trimmer line needs replacing when it wears down or breaks frequently. The string has likely worn out if it gets tangled or struggles cutting. Regular use can wear the line thin, making trimming less effective and causing uneven cuts.

How often you replace your trimmer line depends on use. Cutting thick plants wears it faster. Use frequency also matters.

Heavy, thick grass or weeds wear out the line faster than light trimming. Most people replace the line every few weeks during peak growing season. For occasional use, replacing it every 1 to 3 months might be enough.

Proper maintenance helps your trimmer line last longer. Trim thick brush slowly to avoid quick wear and check the string often for thinning. Keep your line length within the recommended limits.

This is usually 6 to 20 feet. It varies by trimmer model. Wearing sturdy, long pants and eye protection protects you from flying debris during replacement and trimming.

• Replace line if it snaps more than once per session
• Check line thickness and wear before each use
• Remove and rewind new line every 1 to 3 months in heavy use
• Use the correct string type and thickness for your trimmer model
• Avoid trimming in wet conditions to reduce line wear
• Use pre-wound spools for easy replacement on compatible trimmers
• Keep your engine fuel mix correct if your trimmer has a two-cycle engine

Replacing your trimmer line usually takes 10 to 15 minutes. Some models need you to remove the trimmer head. Others let you swap spools quickly.

Always follow your manufacturer’s recommendations for line length and type to avoid damage. Doing so keeps your trimmer cutting cleanly and prevents motor strain.

Troubleshooting Trimming Issues After Restringing

Uneven trimming or line feed problems often come from a few common issues. Check the trimmer line, the spool, and the head condition first. Fixing these usually gets your trimmer cutting right again.

Line Not Feeding Properly

Start by checking the trimmer line for tangles or knots on the spool. The line won’t feed when you bump or pull the trigger if stuck.

The line might be too thick for your trimmer head. Wrong types can block feeding.

Look for a snagged line in the eyelet hole where the string feeds out. Dirt, grass, or debris can jam this hole and stop line movement.

Use a small tool or compressed air to clean it out. This lets the line pass freely again.

• Remove the spool and inspect for knots or tangles
• Use the recommended line thickness for your trimmer model
• Check the eyelet for blockages or damage
• Rewind the line evenly, avoid loose loops
• Clean debris from the head and spool area

Try these fixes before assuming you need new parts. Often, a simple rewind solves feeding issues.

Uneven Line Lengths Causing Vibration

Uneven line can cause your trimmer to vibrate or cut poorly. One string longer than the other hits the grass unevenly, leading to a rough cut. This also strains the trimmer motor and wastes line faster.

Stop and check the line length each time you restring. Make sure both sides are as close to the head’s recommended length as possible. Trim extra line if needed to balance the cutting edges.

Line that’s worn down unevenly could mean a line feed problem. One side staying short means the head may be dirty or damaged. Check the bump feed mechanism for smooth action.

Replacing Worn Trimmer Heads

Trimmer heads wear out over time and can cause poor line feeding or cutting. Cracks, worn-out bumpers, or broken tabs can stop the head from spinning or releasing line properly. Check your head for damage regularly.

Replace the head if it looks cracked or warped. Also swap it if line feed isn’t smooth after winding.

New heads cost about $15 to $40 depending on model, a worthwhile cost for better performance. This step may save your trimmer from more expensive repairs later.

Always use the head type and size recommended for your trimmer to avoid feed problems.

Step-by-Step Action Plan for Stringing Your Grass Trimmer

Follow these steps to restring your trimmer quickly and correctly. Check each step to confirm you’re on track.

1. Before you start: Gather your replacement line, screwdriver, and gloves. Make sure your trimmer is off and cool.
2. Step 1: Remove the spool cap by pressing the tabs or unscrewing it. The spool should come off easily.
3. Step 2: Measure and cut the right length of new line based on your trimmer’s manual. Too short or too long won’t feed properly.
4. Step 3: Insert one end of the line into the spool hole. Wind it tightly in the direction of the arrow on the spool.
5. Step 4: Secure the line ends into the slots on the spool to keep them tight. This prevents tangling inside the head.
6. Step 5: Replace the spool carefully into the trimmer head. Snap or screw the cap back on securely.
7. Step 6: Test the trimmer line by pulling the bump knob. Turn the trimmer on at low speed. Check if the line feeds properly. The line should feed out smoothly.
8. After 2 weeks: Check the line length and tension again. Replace or rewind if the line feeds poorly or breaks frequently.

Frequently Asked Questions

How to Replace Trimmer Line with Bump Feed Head?

Disconnect power and open the trimmer head to remove the empty spool. Wind the new line in the marked direction. Feed it through eyelets.

Reinstall the spool and test feed before trimming. This keeps the line feeding smoothly.

Which Way Do I Wind My String Trimmer?

Wind your trimmer line in the spool’s direction arrow. This prevents tangling and feeding problems. An arrow is usually marked on the spool or inside the trimmer head.

How to Reline a Line Trimmer?

Remove the old line and spool, then wind new line onto the spool. Feed both ends through eyelets for balance. Make sure the line is even on both sides to avoid vibration.

How to Properly Edge with a String Trimmer?

Hold the trimmer so the string spins vertically along the edge. Walk slowly along the edge, trimming grass and weeds cleanly. A vertical string gives neat, straight edges.

Can I Use a Line Thicker Than My Trimmer Recommends?

Using thicker line can overload the motor and cause damage. Stick to the manufacturer’s recommended diameter for best performance. Thicker isn’t always better and may void your warranty.

How Do I Know When My Trimmer Line Needs Replacing?

Replace the line if it breaks easily. Also replace it when less than half its original thickness remains. Dull or brittle line reduces trimming power and can damage your trimmer head.

Before You Go

Stringing your grass trimmer right saves time and gives a cleaner cut. Try restringing the line yourself before your next trimming session. Doing this keeps your lawn edges sharp and your tool in good shape.