HELP > Nerve Damage Symptoms from RedMax BCZ2460S String Trimmer

Discussion in 'Lawn Mowing Equipment' started by diyer999, Aug 18, 2013.

  1. GrassGuerilla

    GrassGuerilla LawnSite Bronze Member
    Posts: 1,437

    It varies not just by brand or model. Even from unit to unit. Some are worse than others. I think it's the bearings in the shaft in some instances. Out of 4 bcz2401s trimmers, 2 were very smooth, one had mild vibes, one was almost unusable.

    If you remove the power head, and swap it to the trimmer head end of the shaft, often the vibe just goes away, or is greatly diminished. You may need to drill a hole in the aluminum shaft for the set screw. Be careful with the set screw in the casting. The casting is pretty thin.
     
  2. diyer999

    diyer999 LawnSite Member
    Posts: 121

    Ok, now its time to talk brands and models. If I get rid of this trimmer, and look for another brand or model it will most likely be one of the following:

    First off, as I said in my op, I have another RM trimmer that does not produce vibrations for me. The only reason I got this one is because my vibration-free trimmer does not take any attachments and I need to run a blade periodically. Maybe I would have been better off getting a reciprocator.

    I think I read about a Husqvarna 426 something, straight tube, very lightweight, and has great reviews, people seem to rave about it. Doesnt take attachments though, so it would be redundant to have two trimmers.

    A Stihl, although I have no idea what model that would be without any vibrations. I cant seem to find details about their products when I look at their online catalog.

    Maybe a Kawi, but since they are quitting the power tools, that might not be a good idea.

    I like the Maru BC2621 specs on paper, but I dont know how it is on vibrations in the real world

    One thing that didnt make sense to me when I thought about using a rubber damper to reduce vibrations, is that rubber transmits vibrations as well as absorbing them. I think Echo chose to use metal springs to reduce vibrations instead of rubber, like RM does. But I think the combo rubber/spring designs might have the least vibrations of all. Anyway, although this CTS might be common in this line of work, the fact that I have used a different RM model without any vibrations has to mean that it is an engineering issue.

    This is one of those times I wish I knew someone that has tried all of these products.
     
  3. diyer999

    diyer999 LawnSite Member
    Posts: 121

     
  4. Mickhippy

    Mickhippy LawnSite Platinum Member
    Posts: 4,205

    Diyer, Ive been running Kawi's for several years and suffer from the vibration problem.

    Look into "White Finger" or HAVS Hand & Arm Vibration Syndrome ...
    http://en.wikipedia.org/wiki/Vibration_white_finger

    Ive been using anti vib gloves for years now after a very bad bout of numb fingers that lasted months. Made several fingers hyper sensitive to EVERYTHING. They came good after a while and I stopped using the glove but then it came back again and have to wear a glove all the time now when using any machinery. I have slightly numb fingers as I type this.
    I'll have this for the rest of my life now, the damage is done. Its nerve damage rather than carpel tunnel.

    Since the numbness has started I would certainly recommend getting some gloves to lessen the chance of long term damage.

    Trouble with gloves though, other than the obvious heat issue is holding the trigger on a trimmer is more difficult as the gel or other makes the handle feel much thicker, this will stress your hand as it will feel like your dropping it all the time.
    Im fortunate in that my problem is in my left hand that holds the loop handle, I'd be screwed if it was in my right hand.

    I use Decade Drivers style glove on my left hand only. Decade have a Summer Weight glove that I like more but I have to buy a pair rather than the one so a waste of money.
     
  5. GrassGuerilla

    GrassGuerilla LawnSite Bronze Member
    Posts: 1,437

    The point of my previous post was that this vibe issue with trimmers transcends make and model, varying by the individual unit. IE some vibrate more, some less or hardly at all. Even with the same model. Often (in my experience) turning the bearings around will help. And also. I've never had a cable driven model vibrate as much as the hollow shaft models.
     
  6. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Posts: 3,712

    as a long time redmax user-the non strato models are smoother .
     
  7. Joey waid

    Joey waid LawnSite Member
    Posts: 109

    I own everything red max, I do not believe its the brand or it. My hands go numb hurt and I can't even open them in the morning. I try to sleep with my hands so they are fully extended and not in a ball, and this has really helped, I know a guy who wears gloves at night to keep his hands straight. I also move all my grips and handles on all my gear, I am 5'5" and I was also feeling pulled forward by standard Handel placement, so now I carry a t wrench with me when I get a unit to dial it in. I also try to swap hand when I trim long involved jobs ex specially when I trim bushes.
     
  8. diyer999

    diyer999 LawnSite Member
    Posts: 121

    That may be correct. I dont know for sure which is the correct medical issue, only that CTS and nerve damage is often discussed simultaneously.
     
    Last edited: Aug 19, 2013
  9. WayneJessie

    WayneJessie LawnSite Member
    Posts: 203

    The gloves I use are full finger units and are made out of a pretty breathable material. I don't find them to be uncomfortably hot at all. They must have some type of anti-microbe treatment to them since I have sweated in them for 3 yrs now and they still don't smell funky. I don't notice my RedMax vibrating any worse than my Shindy unless the line load is out-of-balance. Something about the head design allows it to be imbalanced if not loaded right.
     
  10. diyer999

    diyer999 LawnSite Member
    Posts: 121

    Do the solid steel driveshafts have less vibs than the hollow? I would consider one of them as a replacement?
     

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