Hello Skip B,

We are sorry to hear the problem you are experiencing with trimmer line. We would like to make some suggestions to improve your experience. Trimmer line usually breaks because of line crowding. This occurs when the trimmer head is held too close to hard objects that can break the line such as brick, cement, rocks, or fencing. Keeping the line at full extension, and not crowding it, reduces line breakage problems. We suggest cutting with the bare tip of the line because this is the section which moves at the highest speed. Do not let it hit into grass. Ease the line into vegetation, bit by bit from the edge. Line can also get wrapped around thick vegetation and become tangled, breaking the line. Listen to the sound of the machine and when the line slows down; back off out of the grass. Hope these suggestions help however, if you still have questions or an unresolved issue after going through this troubleshooting guide please contact Greenworks Pro toll-free helpline at 1-855-345-3934.