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Parts Question

    Brandon Williams
    My Husqvarna 128CD string trimmer had its bump knob break...
    Parts Question posted October 30, 2015 by Brandon Williams 
    127 Views, 3 Comments
    Question:
    My Husqvarna 128CD string trimmer had its bump knob break (and therefore the bump spring inside it).

    Is this possible to replace alone?

    I found a couple of parts, the bump knob and spring, are these the correct parts for the 128CD?

    Husqvarna String Trimmer Bump Knob 537419601

    Husqvarna String Trimmer Bump Knob Spring 530053241

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    Answer

     

    • Brandon Williams
      Well I went ahead and purchased these parts at RepairClinic.com as they were pretty cheap. The bump knob does appear to be an exact replacement. (Note in the picture the blue bump knob is OE but cracked) The bump knob spring is definitely not an exact replacement and doesnt appear to fit as it is larger in circumference, shorter in length and tapers. I will attach a picture in the next comment.
      1447769451529.jpg (2.4MB)

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    • Brandon Williams
      The bump knob springs compared. Mine is the one twisted at the end (damaged).
      1447769548306.jpg (2.3MB)

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    • Brandon Williams

      I did some further research and found a trimmer head exploded view of the 128CD. It seems the bump knob spring is this part number: 537338801 (and it does appear to be a match to Poulan part numbers - not sure what the relation is there)

      I ended up ordering the part from this listing on eBay for ~$4: http://www.ebay.com/itm/150481674411 and I can confirm that it is an exact replacement of the OEM bump knob spring on the Husqvarna 128CD.

      So if your bump knob happens to break and your bump knob spring, this spring and the bump knob I mentioned earlier are your cheapest bets/places for replacement. Very relieved that I was able to replace it with these two parts and not have to purchase a brand new entire head. (those are $20-$25)

      I have not tested the knob and spring with it running yet, but it fit and I feel sure it will function properly. I will update this if it doesn't function properly.

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