Changing the Trimmer Line on a Troy-Bilt String Trimmer

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To change the trimmer line on a Troy-Bilt string trimmer, follow these steps:

1. Turn off the trimmer and disconnect it from the power source.

2. Remove the trimmer head cover by twisting it counterclockwise.

3. Take out the old trimmer line spool from the trimmer head.

4. Cut a new trimmer line to the desired length, following the manufacturer’s recommendations.

5. Insert one end of the trimmer line into the anchor hole on the spool.

6. Wind the trimmer line tightly and evenly around the spool, following the direction indicated on the spool.

7. Insert the other end of the trimmer line into the opposite anchor hole on the spool.

8. Place the trimmer line spool back into the trimmer head.

9. Reattach the trimmer head cover by twisting it clockwise.

10. Test the trimmer to ensure the new trimmer line is working properly.

Remember to always consult the user manual for specific instructions for your Troy-Bilt string trimmer model.


Troy-Bilt is a well-known company that manufactures lawn equipment, including gas-powered string trimmers. These trimmers come in heavy-duty models with four-stroke engines and lightweight models with two-stroke engines. Just like any other string trimmer, you will need to replace the line periodically. The method for doing this may vary depending on the model. However, Troy-Bilt offers the convenience of restringing without disassembling the head to remove a spool, which is not common among other trimmer manufacturers. If you have a standard bump-feed model, you will need to remove the spool to restring it.

When purchasing string for your trimmer, you will notice that it comes in different cross-sectional diameters. The diameter can range from 0.080 inches for mowing short grass to 0.155 inches for tough jobs such as brush clearing. It is crucial to consult your user manual to ensure that you choose the correct string for your model. Using a string with a larger diameter can potentially damage the trimmer motor.

Replacing String on a Fixed-Line Head

A fixed-line head trimmer requires a single short length of string. Unlike other heads that continuously feed string as you work, a fixed head must be restrung each time the string ends wear short. The line for this type of trimmer has a diameter of 0.105 inches and offers a long reach, making it easier to trim in tight areas.

Instead of a spool, the string for a fixed head trimmer comes in precut short lengths. To restring the trimmer, you need to grasp the old string and pull it out. Then, feed a new precut length through one of the holes on the side of the head. Push the string until it comes out the other side and pull on both ends to make sure they are even.

Restringing a Click N Trim Head

Restringing a Click N Trim head requires two equal lengths of string, each about 10 feet long. Before starting, make sure to disable the trimmer by removing the spark plug wire. Feed the end of one length through a hole on the side of the trimmer head and push it until it comes out of the hole on the opposite side. Bend the end and insert it into the hole adjacent to the one it just emerged from to secure the string in place.

Repeat the same process with the other length of string. Then, hold the head cover with one hand while cranking the head counterclockwise to wind the string onto the head. Leave approximately 6 inches of string protruding from both sides. This is a bump-feed head, so the string will advance whenever you tap the head on the ground while the trimmer is running.

Restringing a Standard Bump-Feed Head

For a standard bump-feed model, you will need to remove the spool to restring it. Start by unscrewing and removing the bump knob, and then take out the spool and spring. Feed a 10-foot length of string through each of the two holes in the top of the spool and pull them through until there is about 3 inches left. Bend the short end of each line and insert it into the anchor hole next to it. Wind both strings around the spool in the direction of the arrow until there are about 6 inches of string remaining.

Replacing the spool on a trimmer

When replacing the spool on your trimmer, make sure to follow these steps:

  1. Feed the end of each string through the hole in the trimmer head.
  2. Pull the string all the way through, while maintaining tension.
  3. Set the spring and spool in place.
  4. Screw the bump knob back on.

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