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  1. #1
    Super Member 3RRL's Avatar
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    Oct 2005
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    6,812
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    Foothills of the Giant Sequoia's, California
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    55HP 4WD KAMA 554 and 4 x 4 Jinma 284

    Default Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Hello gang,
    It's been a long time ...
    Today, I finally added a pressure gauge to my LW-8 Backhoe. You may remember that I got one from a friend, then fixed it all up and made a custom sub-frame for it to fit my 55HP Kama.

    This is the name of the thread about it: "Diamond Shape Sub-Frame for LW-8 Backhoe" with lots of photos.

    http://www.tractorbynet.com/forums/c...-frame-lw.html

    Anyway, here is my question ...
    Does anybody know what the max PSI I should set the pressure relief valve on the LW-8?
    It has self contained hydraulic system with a PTO mounted pump.

    After installing the gauge, I found out I was getting only about 1,700psi !!
    Right now I've adjusted the pressure relief valve to 2,250psi (same as the tractor hydraulics). However, I thought I remembered reading that the LW-8 and other Jinma backhoes have a higher relief setting than that? Maybe I'm wrong, but it doesn't hurt to ask all you experts out there.

    If you want to see some photos of the gauge mod, I can take some tomorrow and post them.
    Thank you,
    Rob-
    Rob-
    ...The Older I get...the Better I Used to be...
    Member of the Month

  2. #2
    Super Member greg_g's Avatar
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    Dec 2003
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    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    I don't have a technical figure for you Rob, but suggest you check the pressure rating that's marked on the hoses/cylinders/controller. It would seem logical to set the relief valve to at least 10% below the potentially weakest link.

    //greg//
    Last edited by greg_g; 11-06-2012 at 06:07 PM.
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  3. #3
    Elite Member RonMar's Avatar
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    May 2005
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    2,760
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Don't have specs for LW-8... FWIW, I believe my HW-03 is rated the same as my Jinma 284 tractor(looks like the same pump) at 16 MPa max, which converts to 2320 PSI... I think I set mine(loader and BH) around 2250 also...

    Of course we want to see pics of your gauge mod... Your mods are always cool and very well done
    Ron

  4. #4
    Super Member 3RRL's Avatar
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    Foothills of the Giant Sequoia's, California
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    55HP 4WD KAMA 554 and 4 x 4 Jinma 284

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Hi Greg and Ron, thanks for the replies.
    I guess I will stick with the 2250PSI I have it set to now. Just dug an 80' long trench and had plenty of power. Below are some photos showing the new gauge from front and back. I fastened it to the rear of the control housing with clamps and a shock absorbent hose liner. I cut the pressure line in to the valve and inserted a "T". All the fittings are re-usable hose fittings with JIC 1/2" for the pressure line, and 3/8" going to the gauge.

    Thank you,
    Rob-

    Rob-
    ...The Older I get...the Better I Used to be...
    Member of the Month

  5. #5
    R.I.P.
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    Location
    North Carolina
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    Kubota BX2200

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    I set mine to 2350, so I think around 2300 is a good number.
    Which is bigger?: a) $100 per month since the Big Bang or b) the US National Debt.

  6. #6
    Veteran Member Bob Rooks's Avatar
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    Feb 2007
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    Bothell & Silverdale, WA
    Tractor
    Yuchai Bulldozer

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Excellent work Rob.
    My LW-6 was set at 2,250, as is my LiTW BH7600. And FWIW, My Mustang skid steer remote hydraulics are also 2,250.

    Footnote: I'm running a Prince HC7-A PTO pump for the backhoe, and coincidentally, the dozer hydraulics are also set at 2,250 psig.
    Last edited by Bob Rooks; 11-07-2012 at 05:51 PM.
    Yuchai 306R dozer, Mustang 2040 skid steer, Mitsubishi MS035 Mini-Ex with four buckets and a rake, Trimble equipped 7' Dual Dozer with twin GCR-2 laser receivers, and a LiTW BH7600 back hoe (sold).

  7. #7
    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: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    3RRL ,

    Do you have a number or name on the pump .

    I would think the pressure would be in the 2250 to 2500 psi range.

    Is the pump like the Prince pumps or low profile PTO pump.

    http://www.surpluscenter.com/images/p9-1047C.jpg



    http://www.pegasus-industries.com/manuals/Backhoe.pdf
    J.J.

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

    Git er done.

  8. #8
    Super Member 3RRL's Avatar
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    Oct 2005
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    Foothills of the Giant Sequoia's, California
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    55HP 4WD KAMA 554 and 4 x 4 Jinma 284

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Thanks guys,
    Unfortunately, the riveted tag on the pump itself has been torn off so I was unable to identify the pump rating, which is why I posted the question. Anyway, the 2,250PSI setting seems to be comfortable for the hoe, so I will keep it there.
    Thanks again,
    Rob-
    Rob-
    ...The Older I get...the Better I Used to be...
    Member of the Month

  9. #9
    Platinum Member psj12's Avatar
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    Oct 2005
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    Short OK
    Tractor
    KIOTI 554

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Didn't you originally have an Italian BH on that Mount?

  10. #10
    Super Member 3RRL's Avatar
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    Oct 2005
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    Location
    Foothills of the Giant Sequoia's, California
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    55HP 4WD KAMA 554 and 4 x 4 Jinma 284

    Default Re: Need Max PSI Setting for LW-8 Backhoe Relief Valve

    Quote Originally Posted by psj12 View Post
    Didn't you originally have an Italian BH on that Mount?
    Yes, but when I got this one, I moved the Nardi Backhoe over to Loretta's Jinma. Made a nice subframe similar to this one for that tractor.
    Rob-
    ...The Older I get...the Better I Used to be...
    Member of the Month

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