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  1. #1
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    Nov 2009
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    Default Pressure Relief Valve problem???

    Hello All

    I'm trying to help my brother troubleshoot a fail in the backhoe arm of his '92 JCB 214.

    While in use, he lost the ability to swing the boom from side to side. All other rams are working fine (ie he can extend the arm out, etc.) With the machine shut off, he can manually push the boom from side to side. We took out the pressure relief valve and nothing obvious stood out and all bits appeared in check.

    If anyone has any suggestions and/or anything we can check it'd be greatly appreciated!

    Thanks!!

  2. #2
    Advertiser kennyd's Avatar
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    Jul 2003
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    12,563
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    Westminster, MD
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    John Deere 4110, 455AWS

    Default Re: Pressure Relief Valve problem???

    Welcome to TBN

    Since the boom moves side to side with you pushing on it, the the problem is either in the valve itself, or the linkage connecting the joystick to the valve. My money is on the linkage.
    KennyD
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  3. #3
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    Talking Re: Pressure Relief Valve problem???

    Awesome, thanks alot m8, ill try it in the morning.

  4. #4
    Super Star Member J_J's Avatar
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    Sep 2003
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Pressure Relief Valve problem???

    Is there pressure going to the swing cylinders? Perhaps the cyl, or chain or what ever turns the boom has broken. Do you have a gage in the system? Does the valve go into relief. You should not be able to push the boom with the swing lever in neutral, as flow from the cylinders is blocked.
    J.J.

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

    Git er done.

  5. #5
    Epic Contributor
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    jinman's Avatar
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    Feb 2001
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    21,014
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Pressure Relief Valve problem???

    If one of the swing cylinders has blown an internal seal, it may be leaking so much internally that the boom's resistance is enough to cause all flow to bypass. When you stop the tractor or put the joystick in neutral, if the boom still moves easily by hand, you have to think it might be blown cylinder seal. Your boom swing cylinders are in parallel, but the reverse of each other. Because they are in parallel, one blown cylinder's seal will defeat the movement of both cylinders.

    You can remove the hoses from the swing cylinders and check for flow and pressure as the joystick is moved. If you plug both lines to a cylinder, it will lock if the internal seals are good. You'll have to check each cylinder individually while leaving the other open because one good cylinder will lock the boom if your put plugs in the ports. I'd plug one cylinder at a time while leaving the other open and see if I could move the boom. Reverse the plugs and try the other cylinder. Whichever one moves, that is the cylinder with the blown seal. You have to make sure the cylinder is full of oil before testing this way and it may be nearly impossible if the ports are on the bottom or side rather than the top. It might require removal of the cylinders. You just have to get a bit creative.
    Jim


  6. #6
    Gold Member
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    Oct 2006
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    Wascott, WI, USA
    Tractor
    2006 Jinma 354LE w/YD485

    Default Re: Pressure Relief Valve problem???

    I agree with jinman. In fact, if it weren't for what he was doing with his tractor in his avatar, I'd say he's pretty smart.
    Alcohol, Tobacco and Firearms should be a convenience store, not a government agency.

    2006 Jinma 354LE w/YD485, ZL-30 FEL, LW7 backhoe, Rear blade, tiller, brush hog, box blade, post hole auger, snowblower, boom pole, carry all

  7. #7
    Epic Contributor
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    jinman's Avatar
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Pressure Relief Valve problem???

    To quote Bartles and James: "Thanks for your support."
    Jim


  8. #8
    Super Star Member J_J's Avatar
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Pressure Relief Valve problem???

    Check your fluid level, if it is low, you may have cracked a fitting or a bad hose. Again, the boom should not move with the valve in neutral.
    J.J.

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

    Git er done.

  9. #9
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    Nov 2009
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    Default Re: Pressure Relief Valve problem???

    You can remove the hoses from the swing cylinders and check for flow and pressure as the joystick is moved

  10. #10
    Super Member dcyrilc's Avatar
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    Nov 2009
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    Woodinville, Washington
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    John Deere 2240 MFWD

    Default Re: Pressure Relief Valve problem???

    Quote Originally Posted by jinman View Post
    To quote Bartles and James: "Thanks for your support."
    Hey Jinman,

    What were you doin' in that pic?

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