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  1. #1
    Platinum Member Monster5601's Avatar
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    May 2010
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    603
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    Oakland, MI
    Tractor
    Kubota B3030 R4 Tires

    Default Converting BH76 thumb to hydraulic

    Has anyone converted their BH76 mechanical thumb to hydraulic? What I am looking for are recommendations of a hydraulic cylinder.

    It looks like I need a 19" long cylinder, collapsed, 24" fully extented with 1 1/2 inch deep mounts.
    Bob, n8zcc

    Kubota B3030 with R4s
    LA403, 60" bucket with hooks, bolt-on tooth bar, ratchet rake
    BH76 with 16" bucket and thumb
    Kubota Pallet Folks
    Bush Hog 35-06 72" Rear Blade
    Bush Hog SBX60 Box Blade
    Bush Hog Razorback RZ160
    Kubota ZD323-60
    Kubota RTV900 with Curtis hydraulic angle plow

  2. #2
    New Member MattN03's Avatar
    Join Date
    Sep 2004
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    6
    Location
    Central KY
    Tractor
    Kubota B3200, LA504 FEL, BH76 Backhoe & Toro Z-Master 3000

    Default Re: Converting BH76 thumb to hydraulic

    Did you come up with a setup for a hydraulic thumb? I just picked up a used B3200 with a BH76 and would like to add a hydraulic thumb.

  3. #3
    Member
    Join Date
    Apr 2015
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    46
    Location
    Northeastern Pennsylvania
    Tractor
    Kubota MX5800 HST

    Default Re: Converting BH76 thumb to hydraulic

    Quote Originally Posted by Monster5601 View Post
    Has anyone converted their BH76 mechanical thumb to hydraulic? What I am looking for are recommendations of a hydraulic cylinder.

    It looks like I need a 19" long cylinder, collapsed, 24" fully extented with 1 1/2 inch deep mounts.
    A few years back, I converted my BH90 mechanical thumb to hydraulic using a Lion 20TL08-112 cylinder I ordered from Northern Tool. Here are the specs: TL 25 PSI (Discontinued) – Product Availability - Lion Hydraulics | Monarch Industries

    It's a 2" bore, 8 inch stroke tie rod type cylinder. The pin center min. is 18 1/4 and max. 26 1/4 . The product has since been discontinued but I'm sure Lion has a replacement.

    In my case, I had to weld mounting tabs on the boom and I located them to match the cylinder. The boom on the BH76 is already equipped with tabs but it looks like the above cylinder should fit.

    The biggest problem I had with the conversion was the control valve. The factory foot operated unit was too expensive and I didn't like the awkward location on the deck floor. I wound up using one of the tractor hyd. outlet ports. It's a stretch but I can reach the lever from the BH seat without taking my eye off the thumb.

    I traded the BH90 for a BH92 this spring which has a factory installed mechanical thumb. I haven't checked for sure but in looks like the Lion cylinder will work on the BH92 as well. I'm not sure if any of this helps you with your BH76 project though. Good Luck!

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