How to Thread a Grass Trimmer Line

Written by will charpentier
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How to Thread a Grass Trimmer Line
A properly "loaded" string trimmer makes fanciful lawn designs neat. (lawn image by Margerretta from

As the seasons change, so do the sounds, and spring and summer are no exception. Both bring the sound of lawnmowers, leaf blowers and string trimmers--humming, roaring and buzzing their way through the weekend. Occasionally, though, a partial hush will fall over the world of yard work as a string trimmer is taken out of service, its high-pitched whirring silenced because it must have its string--really a piece of monofilament--replaced.

Skill level:

Things you need

  • Trimmer monofilament line

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  1. 1

    Turn off the trimmer and lay it on a flat surface, such as a driveway, work bench or porch, with the trimmer head facing up. Unplug the trimmer, if it's electric, or pull the sparkplug wire off the sparkplug if it's gas.

  2. 2

    Hold the trimmer head steady with one hand and unscrew the trimmer head cover with the other. Trimmers generally rotate clockwise, so turn the cover counterclockwise. If the head won't unscrew, look for a locking tab and depress the tab to unscrew the cover.

  3. 3

    Remove the empty spool from the trimmer. If you're replacing the old spool with a pre-wound spool, set the new spool in place and insert 6 to 8 inches of line through the hole in the housing.

  4. 4

    Thread an inch of the replacement line for a single-strand trimmer through the loop in the housing. If your trimmer is a double-strand model, feed about 15 feet through the loop.

  5. 5

    Search for the arrow on the spool indicating the direction in which to wind the line. Wind the line around the spool in straight, even wraps until the spool is about 3/4 full. If the string trimmer is a double-strand trimmer, wind both the left and right lines in the same direction.

  6. 6

    Pull about 6 inches of line out of each eyelet in the housing. Slip the spool back into the housing, fitting the tabs on the housing to the spool. Screw the cover back onto the spool.

Tips and warnings

  • Test the line's proper operation by turning the trimmer on, then, while the trimmer head is turning, bump the head on the ground. The trimmer, if the line dispenser is working correctly, will dispense about 1 inch of line.

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