Hook lift truck - Need Help

Discussion in 'Heavy Equipment & Pavement' started by ShadyTree, Dec 30, 2013.

  1. mxridernorth

    mxridernorth LawnSite Senior Member
    Posts: 306

    When the hook begins to lift the bin off the ground, what is the distance between the bin hook and the rear of the truck. To maximize weight lifting capacity this distance should be as minimal as possible and the arc of the bottom front of the bin should just clear the rail/roller as the lift travels through its path.A guess of what the issue is (without seeing more photos) would be that the lift is installed to far to the rear. Can you show some side view photos?

    It's a pretty simple statics problem but I would need all relevant dimensions to help you work it out. I'd also need the empty front axle weight.
     
  2. ShadyTree

    ShadyTree LawnSite Member
    Posts: 63

    I totally agree with you about something is wrong with the truck. We have a smaller hooklift and have maxed out the lift capacity on some boxes and the truck still didn't come up in the front. I have been going back and forth with the people that installed it and swap loader. The best answer I got from swap loader was that is normal what is happening to my truck. They suggested a stabilizer after the fact and he won't come and see my truck because he doesn't think anything is wrong with it. I have the people that installed it coming next week so hopefully when they see it in person they can let the rep for swap loader know. I will try and get more images up with some dimensions so you guys can give me your best input.
     
  3. ShadyTree

    ShadyTree LawnSite Member
    Posts: 63

    I'll take some pictures tomorrow and also get you some dimensions. How would I get you front axle weight? Would I just put the front wheels on a scale? The front axle is a 20,000lbs with 46,000lbs rears.
     
  4. ShadyTree

    ShadyTree LawnSite Member
    Posts: 63

    Just found this picture. I had to crop it so I could upload it. Hope this helps give you an idea of the distant between the box and the truck.

    image.jpg
     
  5. ShadyTree

    ShadyTree LawnSite Member
    Posts: 63

    This was the amount of dirt I had in the box when I shot that video.

    image.jpg
     
  6. AEL

    AEL LawnSite Bronze Member
    Posts: 1,725

    If your truck can't even lift that box off the ground without the front wheels coming up , that is a serious issue and it makes the truck pretty much useless. Sorry I can't help more as I am not too familiar with hook lifts but I am with roll offs. Who ever manufactured and installed the hook lift should have known better and explained to you the possible issues with a shorter frame etc. best of luck and keep us posted.
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  7. mxridernorth

    mxridernorth LawnSite Senior Member
    Posts: 306

    I don't have any personal experience with hooklifts either but I can see why people with single axles have an easier time lifting loads. The center of rotation is between the rear axles on a tandem vs the rear axle on a single axle and in this case that adds 2ft to the equation. What is the wheel base of the truck and what is the empty FA weight. I can scale the dimensions of the rest from the drawing.

    Overlaying some lines and arcs onto the side view image (in order to simulate motion) it is apparent that you have two things working against you at the point the bin comes off the ground: the first is the bin weight and the second is the horizontal force as the hook tries to drag the the bin forward. I'm assuming that you are reversing at the same time as you are trying to lift? This will apply an opposite moment (down force at the front). Also, if possible, loading the bin to the rear as much as possible will help too.
     
  8. mxridernorth

    mxridernorth LawnSite Senior Member
    Posts: 306

    I was comparing your photo to the photo on the swaploader site and the pivot point of your frame does seem to be further back than theirs. The boom rotation pin on theirs is right on the tandem group center whereas on yours it appears back near the front of the rear-most axle? Hard to tell exactly from the perspective of the photo.
     
  9. AEL

    AEL LawnSite Bronze Member
    Posts: 1,725

    Picture of the roller i promised you

    roller.jpg
     
  10. NEUSWEDE

    NEUSWEDE LawnSite Bronze Member
    from Maine
    Posts: 1,147

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