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1 killed in man-lift accident in KC

Discussion in 'Safety Issues' started by heavylift, Nov 10, 2009.

  1. willie59

    willie59 Super Moderator

    Dec 21, 2008
    Service Manager
    Knoxville TN
    With all due respect icewater, your post is just a bit factually incorrect, and for safety reasons of readers who might operate one, I feel I should point out some facts.

    The operation envelope is designed to allow for full extension within the working envelope
    The machine I used as an example was a JLG 110HX. On that machine, the "operation envelope" is not designed to allow for full extension, it's designed to prevent full extension, to keep boom extension "within operation envelope". If it extends outside the envelope, the machine will become unstable and can tip. A 110HX at horizontal can not fully extend without tipping.

    the unit if properly set-up and outriggers extended will in fact allow for full boom extension without tipping
    The 110HX does not have outriggers, as most manlifts don't. Outriggers are an option on some models of manlifts, but not the norm. They are not an option on the 110.

    If the unit is tipping without a load and the boom is at horizontal the counterweight should be checked to make cetain it is correct, also the tires can come into play.
    The counterweight on the 110 is fixed on the machine. There is no adding, taking away, or changing of the counterweight on one. As for the tires, they have to be foam filled on the 110 for ballast weight as well as to protect from tire blowout while machine is extended.

    The extension sensor is tied into the tilt switch to disable elevation during unlevel conditions. 
    On a 110HX, the extension sensor is not tied to the tilt sensor, nor does the tilt sensor disable the elevation during unlevel conditions, wouldn't want someone operating a 110 thinking the tilt sensor would protect them from tipping the machine when it's unlevel when in fact it would not.
  2. jstachowiak

    jstachowiak Member

    Feb 12, 2010
    Jacksonville, FL
    Two workers in the basket, one died the other survived. both were reported to be attached to the lift platforms anchorage point.

    The picture on page 4-7 of the operator's manual appears to be the position the lift was in when it went over, except they did not have the boom 90 degrees to travel, infact it is 180 degrees from the travel position.

    Note the position of the knuckle. If the lower tower boom bleeds down at all (without the tower fly boom retracting) the knuckle moves outside the narrow tower path it has to follow to remain stable and upright. That knuckle has to follow a very narrow path as it is raised, this machine's tower boom section raises and extends as you operate one toggle switch. JLG's 800A and 600A and Genie's Z80 and Z135 do not operate this way. The tower boom on these aforementioned lifts raise first then the tower fly boom extends.

    In addition if you look at the service manual there is a check that requires that weight be put in the platform and the platform raised to determine if there is any bleed down.
  3. Truckin4life

    Truckin4life Well-Known Member

    Feb 10, 2010
    Concrete Plant Operator.
    Lubbock, TX
    That is not a jobsite rule, that is an osha regulation. Around here the joke is the require the harness so you dont bounce far from the basket.

    I hate to hear about something like this. But accidents do happen, my condolences to the suffering families.
  4. OFF

    OFF Senior Member

    Sep 30, 2009
    HD Mechanic/Shop Foreman
    Alberta, Canada
    Actually that regulation appeared soon after there was a fatality on a job site up here in the great white north. A mechanic loading a manlift onto a flatbed ramp truck, drove off the side of the truck, and was thrown (shot) out of the basket as the manlift tipped over. We don't even move a machine into the shop now without a harness on and attached.
  5. stock

    stock Senior Member

    Aug 4, 2008
    We have moved on and now were lost....
    Folks have a look at these Videos the are down loadable for those of you that want to.
    To help with this argument please take special note of
    IPAF CONEXPO 2008 "Only dummies don't wear harnesses in booms"


    I think it is fairly self explanatory.

    The other Videos may help with training.
    There is a wealth of information on this site all be it European but it can be used as "best practice"
    Last edited: Feb 16, 2010
  6. basumayra0910

    basumayra0910 New Member

    May 9, 2010