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  1. #11
    Elite Member Ken45101's Avatar
    Join Date
    Feb 2009
    Posts
    3,304
    Location
    southern Ohio
    Tractor
    Kubota M5040, M9540, B21 TLB, B2710, RTV900, JD 325 Skid steer, KX-121-3 mini excavator

    Default Re: Sheared ripper frame

    Quote Originally Posted by Drsmile View Post
    I'm at 38 on the pto. I'm chalking it up to being a novice and working soil I was not really familiar with. It did great ripping out roots and grading a dirt road that hadn't been touched in 7 yrs. That tractor stopped so fast my neck must have grown an inch when I hit that stump.
    THERE is your problem, IMO: going too fast (along with a light duty bb on a big tractor). I usually just let my tractor idle along, maybe 1200 rpm at most. Many a times I've come to a gentle stop with the wheels spinning when the BB hangs on something.

    The other thing that may help is to have your draft control set so that the 3pt lifts if it encounters a difficult spot.

    I have the heavier rated MBX on a 55 hp tractor.

    I would not significantly beef it up, that is probably the best failsafe point in the possible chain of other things you could break, all of them more expensive to repair.

  2. #12
    Bronze Member
    Join Date
    Jan 2012
    Posts
    81
    Location
    Mountaindale, Oregon
    Tractor
    Allis Chalmers ACD19, ACG; Kubota BX2200 FEL, B2710 FEL, L355SS FEL; Cat D47U, Ford 4600SU FEL

    Default Re: Sheared ripper frame

    Quote Originally Posted by Ken45101 View Post
    THERE is your problem, IMO: going too fast (along with a light duty bb on a big tractor). I usually just let my tractor idle along, maybe 1200 rpm at most. Many a times I've come to a gentle stop with the wheels spinning when the BB hangs on something.

    The other thing that may help is to have your draft control set so that the 3pt lifts if it encounters a difficult spot.

    I have the heavier rated MBX on a 55 hp tractor.

    I would not significantly beef it up, that is probably the best failsafe point in the possible chain of other things you could break, all of them more expensive to repair.
    I agree that you need to go very slow at least till you find all the hidden dangers. I bent a couple of rippers on the outside catching on tree roots but they only bent even though the tractor stopped dead. Go slow.
    Dennis

  3. #13
    Elite Member blueriver's Avatar
    Join Date
    Oct 2007
    Posts
    4,562
    Location
    S.E.Oklahoma
    Tractor
    JD 5520 Montana 4340 Farmall Super C

    Default Re: Sheared ripper frame

    The worst thing (my opinion) is that cut out in the frame to put the ripper teeth thru ... weakens that main frame. Take the rippers out lay a 1/2" flat strap from one end to the other underneath ... cut some 2x2 angle to go across ( 2 for each ripper) weld them to the 1/2" and put the ripper teeth in with two bolts to serve as shear pins.

    Clear as mud (right)
    "When selling a lifetime ... don't sell it short"
    auctioneer@southernauctionco.com

  4. #14
    New Member
    Join Date
    Mar 2013
    Posts
    17
    Location
    White, GA
    Tractor
    '10 McCormick CT50U / John Deere 650 / Bobcat 873 / CAT D3

    Default Re: Sheared ripper frame

    Well I was in range 2 gear 3 not going very fast. I was told the blade was a medium duty when I bought it. It was new on the lot, just had been sitting for year, so I got a fair deal on it. The root was massive, the root ball was around 3' after we dug it up. Someone must have cut it down at grade a year ago and grass / leaves covered it up. Everyone tells me this McCormick is a big tractor, but it seems tiny to me with the big Case and NewHollands around that my neighbors have (granted they raise cattle and such)... 43hp and 38 on the PTO just does not seem like to much for a 6' BB. The ripper tooth frame just seems like a weak design to me.

    I have the BB at a shop right now; will post up picks of the repair / beefing.

  5. #15
    Elite Member Ken45101's Avatar
    Join Date
    Feb 2009
    Posts
    3,304
    Location
    southern Ohio
    Tractor
    Kubota M5040, M9540, B21 TLB, B2710, RTV900, JD 325 Skid steer, KX-121-3 mini excavator

    Default Re: Sheared ripper frame

    Quote Originally Posted by Drsmile View Post
    Well I was in range 2 gear 3 not going very fast. I was told the blade was a medium duty when I bought it. It was new on the lot, just had been sitting for year, so I got a fair deal on it. The root was massive, the root ball was around 3' after we dug it up. Someone must have cut it down at grade a year ago and grass / leaves covered it up. Everyone tells me this McCormick is a big tractor, but it seems tiny to me with the big Case and NewHollands around that my neighbors have (granted they raise cattle and such)... 43hp and 38 on the PTO just does not seem like to much for a 6' BB. The ripper tooth frame just seems like a weak design to me.
    Third gear on road gear? That's fast for a box blade.

    As someone mentioned, your tractor is more powerful than the rated specs (35hp) for the blade. I think many of us have found that it's best to overbuy on implements rather than just marginally meeting the specs or under buying. I got tired of being a frequent customer at the local weld shop

    It's not a weak design, it's designed for what it is spec'd for. Everything has a failure point. Beef it up and it becomes heavier and more expensive. I have the medium duty version on my kubota M5040. Th heavy duty RBX blade is rated for 60 HP, the medium duty for 55 PTO HP tractors. Your blade is only rated for 35 HP.

    The RBX blade is 300 pounds heavier than your SBX blade.

  6. #16
    Veteran Member
    Join Date
    Jul 2003
    Posts
    1,481
    Location
    SW Indiana
    Tractor
    Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST

    Default Re: Sheared ripper frame

    Quote Originally Posted by Drsmile View Post
    The ripper tooth frame just seems like a weak design to me.
    Impossible to tell the wall thickness from that picture but my sense is that it's only 3/16 or less, the way it seemed to curl up. If so, I agree with you.

  7. #17
    Super Member
    Join Date
    Feb 2008
    Posts
    9,393
    Location
    somewhere usa
    Tractor
    Deere 110tlb, 4520, x749, L130

    Default Re: Sheared ripper frame

    That is a heavy tractor for that grade of a boxblade imo. A 5000+ lb tractor needs to be coupled to a medium duty boxblade. I agree with the others suggesting you go slower until you find everything in the ground.

    If it were me I would make the simple repair and reduce engine and travel speeds.

  8. #18
    Gold Member Herkypilot's Avatar
    Join Date
    Oct 2011
    Posts
    369
    Location
    Concord, NC
    Tractor
    Kubota MX5100 DT 4x4 & L3540 HST

    Default Re: Sheared ripper frame

    I have the same BB and it was sold as a medium duty. Behind my 50 hp MX it's performed fine. I have stopped the tractor with it several times without problem.
    I believe what the OP said was that he was in 3rd gear LOW, which I have done also while clearing an old logging road and spreading gravel.


    HP

  9. #19
    Platinum Member allen in texas's Avatar
    Join Date
    Oct 2007
    Posts
    751
    Location
    Levelland, TX
    Tractor
    Kubota Grand L 5740, loaded R1's w/642 lbs cast weight, 854 loader

    Default Re: Sheared ripper frame

    I've torn my box blade up in exactly the same manner. My blade is not tough enough for my tractor but I'll fix it and keep using it.
    It happens.
    KK 72" tiller Rears SPF 72 inch Flail, FL960 knives, Cammond BS72E 6 foot BB,
    HF Quick hitch, RBT3584 rear blade.
    assorted two and 4 row diamond bar equipment, all junky.
    20 ft Big Tex 70CH
    Maxey 14000# 16'x83" GN dump trailer
    Oliver 6241 3 bottom rollover moldboard plow
    http://www.youtube.com/watch?v=EdEStYYl1Ts
    I like straight furrows
    1960 model 102 Ford 14 inch two bottom rollover plow on my little L3240

  10. #20
    Platinum Member KYDan's Avatar
    Join Date
    Sep 2011
    Posts
    692
    Location
    Frankfort, KY
    Tractor
    Kubota MX5100 HST 4WD

    Default Re: Sheared ripper frame

    I have the Dirt Dog 72" rollover box blade and I have bent the shanks by hanging them on big rocks, but have not had any issues with the box itself. Bushhog blades are made by Dirt Dog. The 72" rollover box is rated at 45 PTO horsepower and weighs 710 lbs. I don't have any experience with the MBX box blade series. However, the MBX series Dirt Dog is rated at 65 hp 2WD and 55 HP 4WD. It does not specify PTO HP on their website, however, since it does specify PTO HP on the RO series I would think it is the same for the rest of their blade ratings. I also have R4 tires which will slip more readily than R1's.

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