I have a curved shaft 25cc 2 stroke Troy-bilt weed eater model #Tb32ec. I was using it to cut down some tall grass and it just quit cutting. It never bogged down or stalled out. I made sure that the string or grass did not get tangled up in the head or neck. The head spins just like it should, and isn't froze up. The motor still runs very strong. What could cause this?
Every time you use them, Periodically tap the head on the ground to advance the line. It's important, though, that the head rotates at full speed when you tap it because the centrifugal force of the spinning is what advances the string. Always tap the trimmer head on a soft surface, such as grass, and not on a hard surface, including concrete and wood, or you may damage the trimmer head. It's better to bump the head more often than less often. A blade on the guard automatically cuts the line to the right length. The line of a Weed Eater trimmer head won't advance if it is too short because not enough centrifugal force acts on it. That situation can happen if you don't tap the head often enough or the line becomes sheared by a piece of wire or a root. Running the trimmer with line that is 50 percent or less of the recommended length can cause the head to turn too quickly, which can wear out the engine. A broken spring also can be responsible for failure of the line to advance. The spring can be replaced by removing the spool from the head or by removing the head from the drive shaft, depending on the Weed Eater trimmer model.