SKU: 31247010046

128LD T25 Trimmer Head - Fits Husqvarna 124L, 125L, 128L, 128LD - Replaces 966674401

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Description

128LD T25 Trimmer Head - Fits Husqvarna 124L, 125L, 128L, 128LD - Replaces 966674401128LD Trimmer Head T25 Key Features High Efficiency Tap 'N Go Feed: Specifically designed for entry level and mid range trimmers, the T25 head provides reliable line advancement with a simple tap on the ground, allowing for continuous operation without stopping. Easy Reload Open Eyelets: Features a simplified spool design with open eyelets that make reloading trimmer line faster and less prone to tangling compared to traditional closed loop heads.

128LD Trimmer Head T25

Key Features

  • High-Efficiency Tap 'N Go Feed: Specifically designed for entry-level and mid-range trimmers, the T25 head provides reliable line advancement with a simple tap on the ground, allowing for continuous operation without stopping.
  • Easy-Reload Open Eyelets: Features a simplified spool design with open eyelets that make reloading trimmer line faster and less prone to tangling compared to traditional closed-loop heads.
  • Reinforced Blue Bump Knob: The signature blue knob is manufactured from high-density, wear-resistant polymer to ensure a long lifespan even when used on abrasive surfaces like gravel or dry soil.
  • Optimized Centrifugal Balance: Engineered to reduce vibration and shaft wobble, which protects the trimmer's flexible drive cable and reduces user fatigue during extended yard work.
  • Pre-Wound Performance Line: Usually comes pre-loaded with premium 0.080" or 0.095" diameter line, offering an aggressive cut and high durability for residential trimming and edging.

Replaces / Cross-Reference Part Numbers

  • 966674401
  • 537338306
  • 537338310
  • 5373383-02
  • 578446101

Compatibility & Fitment

This "T25" head is the standard replacement for Husqvarna's lightweight and consumer-grade straight-shaft trimmers. Key compatible models include:

  • Husqvarna 120 Series: 122L, 124L, 125L, 125C, 125LDX, 128L, 128LD, 128LDX, 128R, 128RJ, 129L, 129LD.
  • Husqvarna 200 & 300 Series: 223L, 223R, 322C, 323C, 325C, 325CX.
  • Technical Specification: Fits models utilizing an M10 x 1.25 LHF (Left Hand Female) arbor thread.
  • Note: While designed for straight-shaft trimmers, it is also compatible with specific Husqvarna curved-shaft models that use the M10 thread.

When to Replace

  • Worn-Through Bump Surface: The blue center knob has ground down from pavement contact to the point where the internal spring is visible or the line no longer advances.
  • Cracked Outer Housing: Visible fractures or chips in the black plastic shell, which can lead to the head shattering at high RPMs.
  • Line Overlapping/Welding: The internal spool or divider is damaged, causing the line to melt together or jam inside the head during use.
  • Eyelet Failure: The metal line exits (eyelets) are missing or have developed deep grooves, causing the trimmer line to snap off inside the head repeatedly.
  • Excessive Vibration: The head is no longer balanced due to uneven wear, putting undue stress on the gear head and the trimmer's motor.

Installation Tips

  • Left-Hand Threads: This head is Left-Hand Threaded. To tighten it onto the trimmer, you must turn the head Counter-Clockwise.
  • Lock the Shaft: Insert a small hex key or the factory locking pin into the gear head hole to hold the shaft stationary while you spin the old head off and the new one on.
  • Spool Direction: When reloading line, follow the arrows molded into the internal spool. Winding the line in the wrong direction will prevent the Tap 'N Go mechanism from functioning.
  • Soak Your Line: To extend the life of your trimmer line, soak the spool in water for 24 hours. This keeps the nylon flexible and much more resistant to snapping at the eyelet.
  • Clean the Housing: Every time you reload the line, shake out any dirt or grass trapped inside the head to ensure the internal spring and spool move freely.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31247010046

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