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  1. #1
    Gold Member
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    Apr 2010
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    Forfar, Ontario, Canada
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    1947 Massey Harris 30, 1960 Massey Ferguson 35 (Perkins), 1995 TAFE 351DI, 1980 Bolens G174, 2005 Kubota B7510

    Default How much pressure is too much?

    Just bought a '05 kubota B7510 HST with 210 hours. It has a remote attached to the ROPS. I changed the fittings to try my 3 pt hitch log splitter, which it ran well. But when I put a gauge on the line it read 2850 pounds and the manual says 1950 pounds. Previous owner used it briefly on a post hole digger, but its main job has been mowing with a 5' belly mower.

    Why (and how) should I turn it down?

    Thanks,

    Rod

    -img_6490-jpg-img_6489-jpg
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  2. #2
    Veteran Member banjodunn's Avatar
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    Jun 2008
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    1,228
    Location
    Oz

    Default Re: How much pressure is too much?

    G'day 1950psi seems low for relief pressure but I am not familiar with your machine or how remotes are tapped into it, we always set remotes up so they are protected by the machines relief valve so it remains at manufactures spec. Too much pressure will load up the pump and shorten the life of it and anything that happens to be upstream of your remote valve.

    As for adjusting your relief the black plastic cap down next to where your lever mounts to the valve should pull off and then undo the lock nut and back the stud out that is under that cap. Small changes can make a big difference so say back it off 1/4 turn then start up the machine and check the pressure on your gauge, continue to do this until you reach your figure.

    I like to do these change with the engine off as some valves you can get a small amount of oil leaking when you undo the locknut.


    Jon

  3. #3
    Veteran Member
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    Sep 2007
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    1,978
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    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: How much pressure is too much?

    I looked at your valve and seems like it's not plumbed right. What is the tee in it for? Where are the a and b ports? Now everything could be just fine, it just looks funny to me.

  4. #4
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
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    4,631
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: How much pressure is too much?

    Since you do not have a loader, someone has jacked up BOTH the system relief
    valve and the RV on the remote valve. The system RV on Kubotas is located
    on a valve/diverter block attached to the carcass of the tractor, usually near
    the implement hydraulic pump. 2000psi sounds about right for a deluxe B-series.

    If you lower the RV setting on only your AUX valve, this will protect the splitter
    and the 3-pt cylinder, since the AUX is most likely is plumbed upstream of your 3-pt, with its
    Power Beyond port.

  5. #5
    Gold Member
    Join Date
    Apr 2010
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    465
    Location
    Forfar, Ontario, Canada
    Tractor
    1947 Massey Harris 30, 1960 Massey Ferguson 35 (Perkins), 1995 TAFE 351DI, 1980 Bolens G174, 2005 Kubota B7510

    Default Re: How much pressure is too much?

    The tractor runs very well the way it's set. Why should I not leave it as it is? (Serious question.)

  6. #6
    Veteran Member banjodunn's Avatar
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    Jun 2008
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    Oz

    Default Re: How much pressure is too much?

    Too much pressure will load up the pump and shorten the life of it and anything that happens to be upstream of your remote valve.




    Jon[/QUOTE]

  7. #7
    Veteran Member
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    Sep 2007
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    1,978
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    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: How much pressure is too much?

    Quote Originally Posted by Rod in Forfar View Post
    The tractor runs very well the way it's set. Why should I not leave it as it is? (Serious question.)
    If it's working good don't change anything. Most of the time the a and b port are in line with the spool. That what I was looking at.

  8. #8
    Super Member Henro's Avatar
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    Jul 2003
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    5,294
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    Few miles north of Pgh, PA
    Tractor
    Kubota B2910, BX2200, Yardman 20HP pos...

    Default Re: How much pressure is too much?

    Hi,

    How do you know your Gauge is accurate? Before changing anything I would verify that the pressure gauge you are using is accurate...

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