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  1. #11
    Silver Member
    Join Date
    Aug 2011
    Posts
    125
    Location
    Theresa(Milwaukee) WI
    Tractor
    ford 800

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    On that same note, what is the approximate capacity of the 3pt on a ford 8N. I have a little over 1600 lbs of steel I beam on mine. Makes the filled tires squat a little, but been on there for the 17 years we've had it.

  2. #12
    Veteran Member
    Join Date
    Dec 2009
    Posts
    1,907
    Location
    S. W. Virginia
    Tractor
    Kubota B3200, Ford NAA, IH 454D, Case 1845C

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    Quote Originally Posted by sandpipe View Post
    I recently put a Land Pride 54inch 420lb box blade on my kubota B1750 4wd hst tractor. The manual said the weight limit for the rear lift arms are
    380lbs so I'm over by 40lbs.
    That blade is not too heavy for your tractor. If you are referring to the figure in the manual that states 'max load on lower links' or something to that effect, that figure is per lift arm. So you can actually safely lift 760lbs. Kubota also lists in the 'implement limitations' section the size of box blade they intended for the tractor. Generally these are pretty conservative and my guess is the blade you have is reasonably sized for your tractor.


    As for the fluid coming out, that is a bit disconcerting, but probably unrelated to the size to box blade you are using. Hopefully you can get it figured out.
    Kubota B3200
    Ford NAA Jubilee
    International 454D
    Case 1845C skid steer
    JD 265

  3. #13
    Veteran Member SSdoxie's Avatar
    Join Date
    Jun 2010
    Posts
    2,382
    Location
    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    Just thinking out loud but what about the lowering speed control, if not set to match weight of the blade, tractor shut off with hot oil then drop the blade. Could the oil pushed somewhere it's not supposed to go?
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  4. #14
    Elite Member
    Join Date
    Sep 2003
    Posts
    4,147
    Location
    New Brunswick, Canada
    Tractor
    Kubota L5030 HSTC, MF 5455, Kubota M120, Allis Chalmers 7010

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    No. The lowering speed control just adjusts the orifice returning to the sump from the 3 point valve.

    To those talking about the 3 point causing the main relief to bypass, what are you talking about? With position control that should never happen unless the hitch is out of adjustment.

    The only way to suck air into the 3 point lift cyl is to force the hitch to lift higher than its setting. I've done this lots and never sucked air but if the seals were poor it could happen.

  5. #15
    Elite Member
    Join Date
    Sep 2007
    Posts
    2,887
    Location
    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    """""To those talking about the 3 point causing the main relief to bypass, what are you talking about? With position control that should never happen unless the hitch is out of adjustment."""""

    Right on!!!!! If the relief is opening up, you should be doing some adjusting.

  6. #16
    Platinum Member
    Join Date
    May 2009
    Posts
    926
    Location
    South Mississippi
    Tractor
    2008 John Deere 5303 MFWD

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    Quote Originally Posted by J_J View Post
    Just about every tractor that has a 3pt system would have a 3pt relief or a pump relief, but it is most common to put the relief in the 3pt area. The tractor may or may not ever have a loader installed.

    If you have a hyd gage installed in the hyd system, when you raise the 3pt to max up, the relief valve will activate and screech. Look at the gage to see the relief pressure.

    If you raise the 3pt and do hear the screech, that means that the pressure is at a level set by whoever. Most relief valves are set equal to the loader valve if installed.

    The relief should be about 50 to100 psi below the max pump pressure.

    You need to check the relief pressure anyway to see if the hyd system is working as advertised.
    Your comment about the "relief valve will activate and screech" caught my attention. I have a JD 5303 with JD 522 FEL. I have noticed that I can hear a slight humming when the 3PT is fully lifted. The noise is not very loud and continues unless I bump the lift control down. I assume this is the lift pump running. I have noticed that when operating the FEL that if I reach the end of the dump cycle and still have the control in the dump position I hear a screeching type noise. I have also encountered this before when attempting to lift a heavy object that is beyond what the loader can lift. I have been concerned about the noise I hear and again to the best of my recollection these are the only times I hear it. Is it likely that this is what the noise is, the pressure relief activating before overloading the system?

  7. #17
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,919
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Is my box blade too heavy for my tractor and damaging the hydraulics?

    Everything you describe is related to the relief valve.

    Just expect to hear that noise, as it indicate that the hyd pressure is at the pressure setting for the that relief valve. That also indicates you are working at max force as the pressure is what develops the hyd force along with the size of the cyl.

    If you don't hear that noise when the cyl's are maxed out, then something is wrong.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

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