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  1. #1
    Gold Member
    Join Date
    Jun 2006
    NW WA State
    1980 AC 5020

    Default I added washers to the pressure relief valves....

    Now we're cooking with gas. Or oil, as the case may be. Added a washer to one relief valve, checked max pressure. Added a washer to the other relief valve, checked max pressure. The loader control valve now lets go at the factory spec for the tractor. The tractor relief valve lets go a little higher, less than factory plus 15%, but I don't know exactly where yet, still waiting for some fittings to plug the pressure gauge into the tractor relief valve so I can get a solid reading on it. I had it up to factory plus 15% and removed one washer, so I know it's below that.

    200-300 extra psi's makes a difference. Hope I don't start blowing hoses now


  2. #2
    Super Member texasjohn's Avatar
    Join Date
    Oct 2005
    Central Texas, Jarrell
    Kubota Grand L5030HSTC

    Default Re: I added washers to the pressure relief valves....

    I don't think you''ll start blowing hoses..... I don't know exact actual breaking pressure, but probably approaching 2X the stated max pressure, depends, of course somewhat on age and condition of hoses.
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  3. #3
    Super Member
    Join Date
    Sep 2000

    Default Re: I added washers to the pressure relief valves....

    Good deal!

    No need to worry about the hoses. Burst is usually 3 or 4 times the operating pressure.

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