How to Replace String on a DeWalt Trimmer

On this page (9 sections)

1. What should you check before DeWalt trimmer string replacement?
2. How do you replace string on a standard DeWalt trimmer head?
3. How do you reload a DeWalt QuickLoad head?
4. How do you replace string on a DeWalt trimmer without tangles?
5. Should you use a pre-wound spool or loose line?
6. What should you do if the replacement line will not feed?
7. How often should you replace DeWalt trimmer string?
8. When should you replace the whole trimmer head?
9. What is the simplest DeWalt trimmer string replacement method?

DeWalt trimmer string replacement starts with removing the battery, opening the spool head, and winding approved line in the direction marked on the spool. A pre-wound spool is the fastest option, while loose line gives you more control over the refill.

Before starting, identify your DeWalt trimmer model and inspect the head design. Some models use a standard spool that you wind by hand, while others use a quick-loading head designed around a faster refill method.

If you are new to this tool category, our guide explains what a weed trimmer is and how trimmers differ from edgers. For the terminology, see weed eater vs string trimmer.

What should you check before DeWalt trimmer string replacement?

Check the model, line diameter, spool shape, and winding direction before removing the old line. The wrong diameter or spool can cause poor feeding, excess vibration, or a line that will not fit the head.

Remove the battery or disconnect the power source. Put on eye protection, clear grass from the head, and wait until all moving parts stop.

Look for an arrow on the spool. That arrow shows the winding direction, and the line should sit in neat, even layers rather than crossing over itself.

For model selection, compare the best DeWalt string trimmer options before replacing parts on an older tool. A worn head, cracked cap, or damaged eyelet may need more than new line.

How do you replace string on a standard DeWalt trimmer head?

Open the head, remove the old spool, wind the new line evenly, and lock the ends into the spool slots. These steps apply to a hand-wound design, but your model manual takes priority if the head differs.

1. Remove the battery and place the trimmer on a stable surface.
2. Press the cap tabs or use the release method shown for your model.
3. Lift off the cap and remove the empty spool.
4. Clean grass and dirt from the inside of the head.
5. Cut the approved line to the length specified for your model.
6. Insert one end into the spool's anchor hole.
7. Wind in the arrow direction with firm, even tension.
8. Leave enough line outside the spool to fit into its holding slots.
9. Place the spool back into the head and guide the line through the eyelets.
10. Snap the cap into place and pull the line free from the holding slots.

Do not wind beyond the spool's rim. A spool that is too full can drag against the cap and stop the line from feeding.

Which loose DeWalt line suits a refill?

The DEWALT DEWALT-DWO1DT802-3/PACK DWO1DT802 String Trimmer Line is a loose-line option with 0.080-in line, 3 packs, and 225 ft per pack. It suits readers who want to refill a compatible spool instead of buying a pre-wound replacement.

The product data identifies compatibility with several DeWalt models, including DCST920B, DCST920P1, DCST970, DCST990, and related types. Check your exact model and type before installation because a similar model name does not guarantee a matching spool.

Keep the loose line dry and free from kinks. When cutting a new section, use the diameter and length specified for your head rather than choosing by appearance.

How do you reload a DeWalt QuickLoad head?

A QuickLoad head is reloaded by aligning the line with the loading marks, feeding it through the head, and twisting the cap to draw the line into place. This design can reduce the winding work, but the line still needs to be the correct diameter.

Remove the battery before touching the head. Cut an equal length of approved line, pass it through the guide openings, and center it so both ends are similar in length.

Turn the cap in the direction shown on the head. Stop when the line is evenly loaded and the ends extend the required distance.

Do not force the cap if it binds.

The DEWALT QUICKFEED STRING TRIMMER HD uses a QuickLoad spool feature and comes pre-wound with dual 0.080-in aerodynamic line. It also accepts DeWalt 0.095-in line and is intended for compatible DeWalt cordless string trimmers.

This option suits readers who want to reduce winding time or who have trouble keeping loose line evenly tensioned. Confirm that your trimmer accepts this head design before ordering.

For a damaged cap, worn eyelet, or other head problem, compare the best DeWalt string trimmer replacement head options. Replacing the entire head can make sense when new line does not solve repeated feeding problems.

How do you replace string on a DeWalt trimmer without tangles?

Prevent tangles by winding slowly, keeping steady tension, and laying each turn beside the previous one. Crossed line can pinch inside the spool and stop feeding.

Keep the line inside the spool's guide path. If it jumps over the rim, unwind it and start again instead of pushing the crossed section down.

Leave the line ends in the spool's retaining slots until the spool is seated. Release them only after the line passes through the head eyelets.

A line that is too long can also strike the guard or overload the head. Use the model's specified length and let the cutter on the guard set the working length after the head starts.

Should you use a pre-wound spool or loose line?

Choose a pre-wound spool for speed, and choose loose line for repeated refills from one spool. The best choice depends on whether you value a faster change or more control over line supply.

A pre-wound replacement reduces the chance of uneven winding. The DEWALT QUICKFEED STRING TRIMMER HD is the most direct fit here for compatible QuickLoad heads.

Loose line works well when your spool is in good condition and you are comfortable following the arrow and keeping the layers even. The DEWALT DEWALT-DWO1DT802-3/PACK DWO1DT802 String Trimmer Line provides 0.080-in line in 3 packs, with 225 ft per pack.

The WORX 20V 12" 2-in-1 Cordless String Trimmer is a separate cordless trimmer and edger option, not a DeWalt replacement spool. For choosing a trimmer to use with a zero-turn mower, see string trimmers for zero-turn mowers.

It has a 12-in cutting diameter, 0.065-in line diameter, 7,600 rpm no-load speed, two 20V Power Share batteries, a 20V charger, a trimmer spool, support wheels, and a safety guard.

Its Command Feed spool uses a push-button line-feed system, and the head tilts 90 degrees. The rubberized wheels support edging, while the adjustable spacer guard helps keep the line away from plants and lawn ornaments.

For a hand-operated edging option, see manual lawn edger guide.

Choose this tool only if you want a different complete trimmer and edger platform. Its 0.065-in line is not a substitute for selecting line for a DeWalt head.

What should you do if the replacement line will not feed?

Remove the spool and check the winding direction, line diameter, cap fit, and eyelets. Most feeding problems start with a spool that is crossed, overfilled, installed backward, or paired with the wrong head.

First, disconnect the battery. Pull the line through the eyelets by hand and inspect whether it moves freely.

If the line is trapped, remove the spool and unwind the damaged section. Reload it with even tension and leave the ends in the retaining slots until the cap is secured.

Inspect the cap for cracks and the eyelets for sharp wear. A damaged part can cut the line quickly, so compare best replacement spools for DeWalt string trimmers if the spool itself is worn.

For a DCST922, use the guide to best replacement parts for the DeWalt DCST922 to separate a line problem from a larger parts issue.

How often should you replace DeWalt trimmer string?

Replace line when it becomes too short, brittle, tangled, or difficult to feed. The schedule depends on the grass, pavement contact, edging work, and how often you use the trimmer.

Inspect the spool before each session. If the line breaks repeatedly at the eyelets, check for rough edges, incorrect winding, or a line diameter that does not match the head.

Our guide to How Often Should You Replace String Trimmer Line? covers wear signs and storage habits. Keep the spool clean, avoid dragging the head across hard surfaces, and store loose line where it will not kink.

When should you replace the whole trimmer head?

Replace the head when the cap, spool seat, eyelets, or housing is damaged and a correct refill still will not feed. New line cannot repair a cracked head or a worn guide.

A head replacement also makes sense when the existing design is difficult to reload and a compatible quick-loading head would better suit your routine. Follow the trimmer manual for removal and installation.

Read How to Replace a Trimmer Head? before changing the complete assembly. Disconnect the battery, confirm the thread and fit, and tighten parts only as the manual directs.

What is the simplest DeWalt trimmer string replacement method?

Use a compatible pre-wound spool when speed matters, or wind 0.080-in loose line carefully when you want repeated refills. Always match the spool and line to your exact DeWalt model and head design.

Choose the DEWALT QUICKFEED STRING TRIMMER HD for a compatible QuickLoad setup. Choose the DEWALT DEWALT-DWO1DT802-3/PACK DWO1DT802 String Trimmer Line when your model accepts its 0.080-in line and you want to refill a usable spool.

If the head is cracked or the line keeps binding after careful rewinding, replace the head instead of repeating the same refill. The right DeWalt trimmer string replacement is the one that matches the model, diameter, spool, and winding system.

Frequently asked questions

What size line does a DeWalt string trimmer use?

Many DeWalt replacement options use 0.080-inch line, but the correct size depends on your trimmer model and head. Some DeWalt heads also accept 0.095-inch line.

Check the model instructions before loading line so the spool feeds correctly and the motor is not overloaded.

How do you put string on a DeWalt trimmer?

Remove the battery, take off the spool cap, and remove the empty spool. Cut the approved line to the manual's length, place it in the spool's anchor hole, wind it in the arrow direction, leave the ends in the holding slots, and reinstall the spool and cap.

Why is my DeWalt trimmer line not feeding?

Line may not feed if it is wound in the wrong direction, packed too tightly, crossed over itself, or held in the wrong spool slots. Remove the spool and rewind it evenly.

Also check that the cap is seated correctly and that the line size matches the trimmer head.

Is a pre-wound spool easier than loose trimmer line?

Yes, a pre-wound spool usually makes DeWalt trimmer string replacement faster because the line is already wound. Loose line costs less per refill in some cases and lets you choose the approved diameter, but it requires careful winding and correct spool placement.