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  1. #11
    Elite Member
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    Jul 2009
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    4,287
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    SW WA
    Tractor
    Kubota BX2360

    Default Re: Boom pole and top link

    Compare a typical 3-point boom to the lift arm of a post hole digger to see what I think the OP meant.

    Bruce

  2. #12
    Platinum Member
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    Jul 2007
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    874
    Location
    WV
    Tractor
    John Deere 1026R

    Default

    How about making it bend in the middle like the newer backhoe booms? This would allow you more clearance for whatever you were trying to lift.

  3. #13
    Super Member
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    Feb 2008
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    9,392
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    somewhere usa
    Tractor
    Deere 110tlb, 4520, x749, L130

    Default Re: Boom pole and top link

    Quote Originally Posted by swick1 View Post
    How about making it bend in the middle like the newer backhoe booms? This would allow you more clearance for whatever you were trying to lift.

    Most of the boom poles I have used have about a 60 degree bend in the boom about 18 to 24 inches from the end, works pretty good.

  4. #14
    Super Star Member LD1's Avatar
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    Apr 2008
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    10,516
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    Central Ohio
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    Kubota l3400

    Default Re: Boom pole and top link

    So what is really the question??

    The style that require the separate toplink lift more weight, but not as high.

    The style that is like a PHD (without using the TL), will lift higher, but wont lift as much weight
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


    Ford 5500 Backhoe
    Kubota L3400GST W/LA463 FEL
    2005 Dodge 3500 4x4 Diesel
    8N Rebuilt and restored
    Bushhog 306
    3 Homemade wood hauling trailers
    Dolmar 6400 84cc ported
    Sachs-Dolmar 120SI Ported
    (4) Sachs-Dolmar 116SI Ported
    Dolmar PS540
    Sachs-Dolmar 115i
    Sachs-Dolmar 117
    Sachs-Dolmar 112

  5. #15
    Veteran Member PhysAssist's Avatar
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    Aug 2011
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    1,228
    Location
    Upstate NY- see the BIG lake- look just below it...
    Tractor
    Kubota B2320

    Default Re: Boom pole and top link

    Quote Originally Posted by sparc View Post
    I think this is it.

    http://www.ag.ndsu.edu/aben-plans/6191.pdf


    The entire index of all plans available is here:

    Miscellaneous NDSU Ag CMS


    And in case you think you might need one, here's aplan for a Fallout Shelter for 6 people.
    http://www.ag.ndsu.edu/aben-plans/5957.pdf
    Hi Sparc,

    Thanks for the links.

    We already have a pretty decent shelter, but thanks anyway!

    Yours,
    Thomas

  6. #16
    Platinum Member
    Join Date
    Sep 2011
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    667
    Location
    vermont
    Tractor
    Hurlimann 435, Fordson E27n, Bolens HT-23

    Default Re: Boom pole and top link

    Quote Originally Posted by LD1 View Post
    So what is really the question??

    The style that require the separate toplink lift more weight, but not as high.

    The style that is like a PHD (without using the TL), will lift higher, but wont lift as much weight
    How did you arrive at this generalization?

    If the boom is long (tall), the force vectors bring the weight of the load very close to the far ends of the three point lower arms in spite of carrying the load some distance clear of the tractor.

    allowing a load nearly equal to the capacity of the lift. Adding a TL does not change this relationship.

    The "typical" boom pole does tend to act more like a cantilever than a crane however.

    Something I have never liked for moving heavy loads. And if it's light and low, I just use the bucket

  7. #17
    Veteran Member
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    Jul 2003
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    1,993
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    MN
    Tractor
    Ford 960, 7700, TW20, 1720; IHC H, 300; Ollie S77

    Default Re: Boom pole and top link

    Quote Originally Posted by gwdixon View Post
    How about adding a hydraulic top link for additional functionality?

    Just a random thought.
    That works well for me, with a regular 3pt type.

    The ones without the top link will pivot higher and faster - which requires more power from your 3pt as you double the speed/height, you need more lifting pressure.

    --->Paul

  8. #18
    Veteran Member
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    MN
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    Ford 960, 7700, TW20, 1720; IHC H, 300; Ollie S77

    Default Re: Boom pole and top link

    Quote Originally Posted by CalG View Post
    How did you arrive at this generalization?

    If the boom is long (tall), the force vectors bring the weight of the load very close to the far ends of the three point lower arms in spite of carrying the load some distance clear of the tractor.

    allowing a load nearly equal to the capacity of the lift. Adding a TL does not change this relationship.

    The "typical" boom pole does tend to act more like a cantilever than a crane however.

    Something I have never liked for moving heavy loads. And if it's light and low, I just use the bucket
    The top link style lifts a 1:1 ratio, lift the 3pt 2 feet and the boom raises 2 feet.

    They type without the top link work like a sissors lift, multiplying the height & speed of the end of the boom pole - depending on the angles used, could lift 2x as high, and require 2x as much power from the 3pt.

    --->Paul

  9. #19
    Super Star Member LD1's Avatar
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    Apr 2008
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    10,516
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    Central Ohio
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    Kubota l3400

    Default Re: Boom pole and top link

    Quote Originally Posted by CalG View Post
    How did you arrive at this generalization?

    If the boom is long (tall), the force vectors bring the weight of the load very close to the far ends of the three point lower arms in spite of carrying the load some distance clear of the tractor.

    allowing a load nearly equal to the capacity of the lift. Adding a TL does not change this relationship.

    The "typical" boom pole does tend to act more like a cantilever than a crane however.

    Something I have never liked for moving heavy loads. And if it's light and low, I just use the bucket
    Quote Originally Posted by rambler View Post
    The top link style lifts a 1:1 ratio, lift the 3pt 2 feet and the boom raises 2 feet.

    They type without the top link work like a sissors lift, multiplying the height & speed of the end of the boom pole - depending on the angles used, could lift 2x as high, and require 2x as much power from the 3pt.

    --->Paul
    Correct you are Paul. (rambler)

    The 3PH by nature is a parallelogram linkage. Allthough most of the time it is not set up as a perfect parallelogram. Even adjustments made to the toplink length and location (mounting hole) can effect lift capacity. If it were set up as a true parallelogram though, its lift capacity would be the SAME at ANY point on the boom. (provided enough front end weight).

    Think about it this way, The amount of travel distance of the hooking point on the boom in relation to the amount of travel at the "ball ends" of the 3PH is going to be how much you can lift.

    If you have a boom pole and set the 3PH up in a true parallelogram fashion, the hook of the boom, even 8' back, will have the exact same amount of travel as the 3PH ball ends. You can even modify (with toplink adjustments) the 3PH to where the hook has LESS travel than the 3PH, and you will be able to lift even MORE than the 3PH is rated for at the ball ends. And if you seet it up where the hook moves more, you will have less lift capacity.

    BUT...with a PHD type without a separate TL, ANY point behind 3PH pivot is moving MORE than the 3PH ends, thus MORE range of travel but LESS lift capacity.
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


    Ford 5500 Backhoe
    Kubota L3400GST W/LA463 FEL
    2005 Dodge 3500 4x4 Diesel
    8N Rebuilt and restored
    Bushhog 306
    3 Homemade wood hauling trailers
    Dolmar 6400 84cc ported
    Sachs-Dolmar 120SI Ported
    (4) Sachs-Dolmar 116SI Ported
    Dolmar PS540
    Sachs-Dolmar 115i
    Sachs-Dolmar 117
    Sachs-Dolmar 112

  10. #20
    Platinum Member
    Join Date
    Sep 2004
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    583
    Location
    south/central Va.
    Tractor
    Deutz Fahr Agrofarm 100, Stoll loader, bucket, forks & root grapple

    Default Re: Boom pole and top link

    Just thought I'd throw this in on a side note. I had a neighbor (passed away several years ago) that was using a boom pole without the top link and the pin that connects the pole to the top link connection broke. The pole came up and then moved forward pinning him against the steering wheel. He was lucky to just have some bruising and was very sore for about a week. Could have been much worse. So be careful and make sure the pins are secure and in good condition.
    Charolais

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