How to Replace Lines in a Grass Trimmer


A grass trimmer is a very useful yard tool to own. It makes trimming around fence posts, mailboxes or anything else that sticks up from the ground very easy. A grass trimmer has a hard, plastic string that is wound around a spool. The spool spins and the string cuts through grass, weeds and small sticks. Eventually the plastic string wears away and you will need to replace the entire spool. This is a very simple process.

Step 1

Turn the grass trimmer upside down so you can look under the protective hooding. Clean the underside to remove stuck-on grass clippings. Use either a garden hose to spray it or a wet rag to wipe it down.

Step 2

Unscrew the cap holding the spool in place. You may be able to do this by hand, or there may be a screw holding it in place. Remove the cap and the old spool from the grass trimmer.

Step 3

Put a new spool in place or wind new string around the old spool. If you are winding the old spool with new string, you will need approximately 5 to 6 feet of string to fill the spool. Do not overfill, as this will cause slippage.

Step 4

Put the spool back in the trimmer and screw the cap back on to hold the spool in place.

Tips and Warnings

  • If you are changing the spool to an electric grass trimmer, make sure the trimmer is unplugged first.

Things You'll Need

  • Garden hose
  • Rag
  • Replacement string spool
  • Screwdriver


  • Toro: Trim & Edge Electric Trimmers
Keywords: grass trimmer string, grass trimmer spool, change spool, grass trimmer lines, string trimmer

About this Author

Robin Gonyo has been writing for several years now. She has a deep love for gardening and has spent a vast amount of time researching that subject. Previously she has written for private clients before joining Demand Studios. She hopes to share her knowledge with others through her writing.