How to install a string on a Stihl trimmer

Written by eric blankenburg
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How to install a string on a Stihl trimmer
Installing a new string on your Stihl trimmer is easy. (line trimmers image by Horticulture from

The monofilament string on Stihl trimmers comes in different sizes and shapes, and every model uses a specific type based on the diameter of the string. Most home and garden centres carry a wide selection of lines. Due to the removable spool retainer, you can buy this string in bulk and cut it off as needed.

Skill level:

Things you need

  • Scissors
  • Properly sized trimmer line

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  1. 1

    Flip the trimmer upside down. Insert your fingers into the tabs of the autocut cover and pull it off.

  2. 2

    Unscrew the locking nut on the centre of the head. Push down on the spool cover, twist it counterclockwise and take it off.

  3. 3

    Pull out the spool retainer; make sure the centre spring stays inside it. Remove any old string from the retainer.

  4. 4

    Cut off two 20 cm (8 feet) lengths of line.

  5. 5

    Insert one of the lines into one of the anchor holes. These holes are located on the upper and lower part of the spool on the outside ring.

  6. 6

    Twist the string around the spool in the direction of the arrow on top of the spool retainer. Keep the string tight and wind it in even lines; leave about a 6 mm (1/4 inch) of space between the top and the string.

  7. 7

    Stick the remaining 15 cm (6 inches) or so in the notched slot on the upper part of the flange.

  8. 8

    Insert the second line into the other anchor hole and wind the string, following the direction of the arrows. Stick the remaining string into the slot on the lower flange.

  9. 9

    Put the spool retainer back on the shaft; push down and twist it clockwise to lock it in place. Screw the locking nut in place and reattach the autocut cover.

Tips and warnings

  • Don't overload or overtighten the string, because it can get fused together from heat and friction inside the head.

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