Overview
This replacement trimmer head assembly provides reliable bump-feed line advancement for string trimmers and weed eaters. When the original head cracks, the bump knob wears out, or the internal spring loses tension, line feeding becomes inconsistent. A new aftermarket trimmer head restores smooth, on-demand line advancement.
Key specifications
- Replacement bump-feed trimmer head assembly
- Tap-to-advance line feed mechanism
- Includes bump knob and internal spring
- Compatible with standard trimmer line diameters
Compatibility
This trimmer head is designed for Husqvarna string trimmers as listed above. Confirm the thread size and direction match your trimmer’s drive shaft before ordering.
Installation notes
Disconnect power from the trimmer. Unscrew the old bump knob or trimmer head from the drive shaft. Thread the new head onto the shaft, following the specified thread direction (typically left-hand or right-hand as marked). Wind fresh trimmer line onto the spool per the arrow markings before use.
Common questions
Q: Will this T25 Tap Advance trimmer head fit my Husqvarna 128LD and does it use the M10×1.25 left-hand thread?
Yes, this head is compatible with the Husqvarna 128LD and other listed models that use the M10×1.25 LH arbor. If you’re replacing the original head, just confirm your unit hasn’t been fitted with a different adapter, since some setups may also reference 3/8” RH depending on the shaft or attachment configuration.
Q: I have a Husqvarna 325L—how do I install this T25 Tap Advance head correctly without damaging the threads?
Lock the gearbox or shaft per your trimmer’s service method, then thread the head on by hand first to avoid cross-threading. Because many Husqvarna trimmers use a left-hand thread, you typically tighten it opposite of a standard bolt, so check the shaft thread direction before using tools.
Q: How do I reload line in this T25 Tap Advance head, and what should I do if the bump-feed stops advancing properly?
Open or align the spool as designed and load the correct trimmer line evenly on both sides so the head stays balanced during use. If line stops feeding, clean out packed grass and debris, inspect the spring and spool for wear, and make sure the line isn’t oversized or wound too tightly inside the head.
