Mac Allister Strimmer Head Replacement: A Practical Guide

The Mac Allister brush cutter is a popular choice for landscapers and homeowners alike, thanks to its robust construction and reliable performance. Over time, however, the cutting head can wear out or become damaged, requiring a replacement. This article walks you through the Mac Allister Strimmer Head Replacement process, drawing on insights from a recent SurgicalUnboxing review and practical tips from the Stihl String C 25‑2 guide.

Why Replace a Strimmer Head?

What You’ll Need

  1. New Mac Allister strimmer head (compatible model)
  2. Socket wrench set (usually 10 mm or 12 mm)
  3. Brush cutter line (matching the new head)
  4. Thread‑locking fluid (optional)
  5. Clean cloth and light lubricant for bearings

Step‑by‑Step Easy Guide to Replacement

Below is a concise, step‑by‑step approach that mirrors the Step by step easy guide to found in many online tutorials.

  1. Disconnect the Power Source
    Turn off the brush cutter and remove the battery or disconnect the fuel line to prevent accidental starts.
  2. Remove the Old Head
    Using the appropriate socket, loosen the head mounting bolts. If the head feels stuck, gently tap the bolt ends with a rubber mallet. Once free, lift the head off the shaft.
  3. Inspect the Shaft
    Check for burrs or damage. Clean with a cloth and apply a light coat of lubricant to the bearings.
  4. Attach the New Head
    Align the new head’s mounting flange with the shaft. Tighten the bolts evenly to avoid warping. Apply a small amount of thread‑locking fluid if recommended by the manufacturer.
  5. Wind the Line on the Bobbin Case
    Refer to the Review of the angle gear of the brush cutter for proper line tension. Wind the line onto the bobbin, ensuring it sits snugly but not overly tight. This step is critical for maintaining optimal cutting performance.
  6. Re‑engage the Power Source