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  1. #11
    Veteran Member bandit67's Avatar
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    May 2004
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    1,543
    Location
    Foothills, Colorado
    Tractor
    B3000 HSDCC

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    I thought I'd talk to someone like WR Long to see if they could come up with an electric-over-hydraulic setup like they have for the FEL remotes. They add a hyd block to the FEL block, so maybe something similar could be added to the backhoe hyd block. I'd like a switch setup that I could add to the backhoe bucket curl joystick, like on a mini-ex.

    Actually might be a nice project for them to take on, since I'd bet they'd sell quite a few kits to owners of the smaller backhoes with mechanical thumbs. Worth a phone call, I guess.

    If I was a hydraulic guru, I'd design & build my own setup, but since I'm not, it would ultimately be cheaper for me to just buy someone else's properly designed system.
    2012 Kubota B3000, block heater, filled rears, rear wheel spacers, fender extensions, LA403 w/60" bucket, BH77 w/12" bucket & mechanical thumb, Kubota pin-type QA, Kubota forks, Caroni TM1600 flail, Buhler Allied YC6010 3pt blower, Meyer 72" FEL mounted plow, Midwest LR2072 rake



    Previous machines:

    2008 Kubota B3030 (Open Station), LA403, BH75, 4 - 55w halogen front & rear ROPS mounted worklights with L39 dash switches
    2004 Case NH DX24E Subcompact

    Kubotas from Barlow's

  2. #12
    Gold Member vic4news's Avatar
    Join Date
    May 2007
    Posts
    285
    Location
    Merrimack County, NH
    Tractor
    Kubota B3030

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    You might want to look at the Woods documentation for their mechanical to hydraulic conversion kit. Might give you some ideas of how you want to plump the valve.

    http://www.woodsequipment.com/upload...ls/MAN0815.pdf

  3. #13
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
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    7,105
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    I have a B26 with hydraulic thumb and man is it handy. I like the foot control plate as it allows you to continue with full function of the hoe will closing or opening the thumb although it is a little cramped on the operator platform with the paddle folded out. I bought it used with 68 hours last June and have 220 hours on it now. The thumb is plenty sturdy and needs same hydraulic pressue as the hoe to operate correctly. Seems to me that one could splice in an extra block on the Hoe controls and run to the thumb control valve pretty easily. You will need to weld on some clips to hold the new hydraulic lines in place. The fingers on the thumb need to match up so that they fall between the teeth on the bucket not on top of them.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  4. #14
    Gold Member CanuckPT's Avatar
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    Sep 2012
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    267
    Location
    West Chesterfield, NH
    Tractor
    2011 Kubota B3300SU

    Default

    Quote Originally Posted by PAPPASMURF View Post
    If I am correct (and I think I am) my dealer offered me a mechanical thumb or hydraulic thumb on my bh77 when I bought it in 2011. I didnt get either one (had already went over budget) but later after my purchase became interested and did research to find that it is offered and is pretty beneficial to those who would use it alot. Wish I had just a mechanical one myself!
    I'm about to pull the trigger on a Bro-Tek thumb for my BH77. I'll let you know how it goes!'
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade

  5. #15
    Silver Member KubotaToy's Avatar
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    Nov 2011
    Posts
    135
    Location
    SE Tennessee
    Tractor
    Kubota B2710HSD (hers) and L45 (mine), RTV1100 (mostly hers, but I get to drive it sometimes)

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    I let the dealer talk me into getting hydraulic thumb on my L45 which was already set up for it. Best money I ever spend!

    -photo_122311_003-jpg

  6. #16
    Gold Member CanuckPT's Avatar
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    Sep 2012
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    267
    Location
    West Chesterfield, NH
    Tractor
    2011 Kubota B3300SU

    Default

    Nice! I wish it was in my budget!
    Kubota BH77 Backhoe with Bro-Tek mechanical thumb & Bro-Tek Ripper Tooth; Loflin 48 inch forks; Bro-Tek 2" rear wheel spacers; StabilWorks custom stabilizers; EA 66" Box Blade

  7. #17
    Gold Member ericdube's Avatar
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    May 2010
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    323
    Location
    Massachusetts
    Tractor
    Kubota L4760

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    Have a read through this thread if you haven't already. If you can do it on a BX, then I'm sure it's definitely possible on a BH77!

    http://www.tractorbynet.com/forums/k...lic-thumb.html

  8. #18
    Veteran Member bandit67's Avatar
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    May 2004
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    1,543
    Location
    Foothills, Colorado
    Tractor
    B3000 HSDCC

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    Quote Originally Posted by CanuckPT View Post
    I'm about to pull the trigger on a Bro-Tek thumb for my BH77. I'll let you know how it goes!'
    I hated that thumb on my BH75, and sold it within a couple months of getting it. The kubota thumb on the BH77 is far superior. Still plan to eventually convert it to hydraulic.
    2012 Kubota B3000, block heater, filled rears, rear wheel spacers, fender extensions, LA403 w/60" bucket, BH77 w/12" bucket & mechanical thumb, Kubota pin-type QA, Kubota forks, Caroni TM1600 flail, Buhler Allied YC6010 3pt blower, Meyer 72" FEL mounted plow, Midwest LR2072 rake



    Previous machines:

    2008 Kubota B3030 (Open Station), LA403, BH75, 4 - 55w halogen front & rear ROPS mounted worklights with L39 dash switches
    2004 Case NH DX24E Subcompact

    Kubotas from Barlow's

  9. #19
    Gold Member
    Join Date
    Oct 2010
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    338
    Location
    NYS--Various Parts
    Tractor
    Ariens/Simplicity/Sears

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    Quote Originally Posted by wdchyd View Post
    Knowing the kind of damage that can happen to hyd thumbs, I elected to spare myself the trouble to modify my mechanical one.....If I was relying on using it for work (which I don't) then a hyd thumb conversion would be on my christmas list

    That said, I love the mechanical thumb....
    wdchyd,

    Can you please expand on this statement: "]Knowing the kind of damage that can happen to hyd thumbs, I elected to spare myself the trouble to modify my mechanical one....." Just never heard of any issues, other than if you try to put a thumb on a bucket where the teeth don't "mesh" between the two, then you can bend parts, I'm told. In other words, as Gary Fowler, said, above: "The fingers on the thumb need to match up so that they fall between the teeth on the bucket not on top of them."

    Curious as to what issues you've run into.

    Thanks,

    My Hoe

  10. #20
    Elite Member wdchyd's Avatar
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    Apr 2010
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    2,675
    Location
    Hooksett, NH
    Tractor
    Kubota B2320

    Default Re: BH77 - has anyone considered converting mechanical thumb to hydraulic?

    Not to poo-poo on anyones wishes to install one but realize I do cylinder rebuilding, and that includes damaged ones

    Many bent rods (leading to scored barrels cuz the piston head cocked sideways internally) have been diagnosed back to the problem of induced load

    Meaning a force pushing in to the thumb piston is greater than the hyd cylinder can survive from another source......the bucket curl.

    The bucket curls larger displacement and leverage can put extreme forces while clamping down using the curl cyl, unless there is a relief setup to allow extra pressure to relax (ie:work port reliefs in the control valve) during curl cyl use

    If the hyd thumb is properly installed, the thumb cyl should go back in when there is too much pressure.....not bend and self-destruct. Without the safety of the reliefs plumbed in to the base end of the thumb cyl, the pressure intensifies greater than the rated pressure of the cylinder (assuming the thumb cyl is smaller than the curl)

    Ideally either work ports reliefs or sizing the cylinder large enough to match is my recommendation

    I actually have no problem with hyd thumbs, just not on my machine, I don't make a living with it
    2010 Kubota B2320 FEL & BH65
    If it ain't fixed don't broke it!

    http://www.tractorbynet.com/content/...-month-wdchyd/

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