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  1. #11
    Gold Member
    Join Date
    Nov 2000
    Posts
    350
    Location
    Henrietta, NY, USA
    Tractor
    790 John Deere, 2000

    Default Re: Power Beyond

    I'll start looking around this spring. Thanks

  2. #12
    Veteran Member jimgerken's Avatar
    Join Date
    Nov 2001
    Posts
    1,638
    Location
    Minnesota
    Tractor
    John Deere 3720

    Default Re: Power Beyond, relief valve???

    Does tapping into the PB port on an existing DSCV or SCV get you the advantage of being relief-valve protected, otherwise by plumbing into the block between the pump and the DSCV you'd be running without one, so your new valve would have to have it? I ask this because I've been told by two different vendors that a valve must have a relief valve in it, when adding it to a tractor. But I'm begining to suspect that if you are plumbed to the PB port of an existing valve you'd be protected by that valves relief valve and so your new add-on valve wouldn't need a relief valve in it.. I don't know this for sure but am reading between the lines on adding like a log splitter valve to the PB ports, the splitter valve is a simple single-spool without a releif and so it sort of adds up. What do you think?

  3. #13
    Elite Member
    Join Date
    Mar 2000
    Posts
    3,239
    Location
    Eastern Virginia
    Tractor
    EarthForce EF-5 mini-TLB (2001)

    Default Re: Power Beyond, relief valve???

    jimgerken - <font color=blue>Does tapping into the PB port on an existing DSCV or SCV get you the advantage of being relief-valve protected, otherwise by plumbing into the block between the pump and the DSCV you'd be running without one, so your new valve would have to have it?</font color=blue>

    Correct on all counts.

  4. #14
    Veteran Member hayden's Avatar
    Join Date
    Sep 2000
    Posts
    1,709
    Location
    MA/VT
    Tractor
    Kubota L5740 cab + FEL, Cat D5G dozer, Kubota KX121 excavtor

    Default Re: Power Beyond, relief valve???

    But won't the overall system relief valve kick in if you overload and have no relief valve in the control? I always thought the effect of a relief valve in a control was to allow a LOWER relief setting than the system pressure for that particular impelement/control. Isn't is basically relief valves in parallel and the lowest setting lets free first?

  5. #15
    Elite Member
    Join Date
    Mar 2000
    Posts
    3,239
    Location
    Eastern Virginia
    Tractor
    EarthForce EF-5 mini-TLB (2001)

    Default Re: Power Beyond, relief valve???

    Hayden - It was the overall system relief valve that we were talking about being circumvented - if you don't put the new circuit in after the front block, where the system relief valve is located, the new circuit isn't protected by it.

    If, as you mention, a circuit is installed after the system relief valve, and it contains its own relief valve, whichever one is set to the lower setting will "pop" first.

  6. #16
    Veteran Member hayden's Avatar
    Join Date
    Sep 2000
    Posts
    1,709
    Location
    MA/VT
    Tractor
    Kubota L5740 cab + FEL, Cat D5G dozer, Kubota KX121 excavtor

    Default Re: Power Beyond, relief valve???

    I see. I was thinking the relief valve was part of the pump and protected everything. I see now it's part of the 3PH lift and only protects the stuff downstream of the first block (like the lift and second block).

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