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  1. #1
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    Default weak/slow hydraulics l 48 kubota

    Needing some info I have had field service out to check loader and backhoe pressure it has OEM new filters the pressure is set at 2875 the backhoe stalls under a load the loader struggles to pickup a load of dirt my local dealers can't tell me if the loader has a relief valve one says it does the other dealer says its under the seat any ideas

  2. #2
    J_J
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    Default Re: weak/slow hydraulics l 48 kubota

    Is your loader valve under the seat or up front.

    Show some pictures.
    J.J.

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

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  3. #3
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    Default Re: weak/slow hydraulics l 48 kubota

    Hyd outlet block has a relief and the loader also has 1. Backhoe has 6. The 3pt well have 1 and a safety valve.

  4. #4
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    Default Re: weak/slow hydraulics l 48 kubota

    Thanks ill try that

  5. #5
    J_J
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    Default Re: weak/slow hydraulics l 48 kubota

    Quote Originally Posted by Leejohn View Post
    Hyd outlet block has a relief and the loader also has 1. Backhoe has 6. The 3pt well have 1 and a safety valve.
    The BH should have one main relief, and maybe a work port relief for each spool.
    J.J.

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    Git er done.

  6. #6
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    Default Re: weak/slow hydraulics l 48 kubota

    That's right,I think the hyd block relief takes care of the backhoe.

  7. #7
    J_J
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    Default Re: weak/slow hydraulics l 48 kubota

    dale55 ,

    Please show a picture of the input side of the BH.
    J.J.

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  8. #8
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    Default Re: weak/slow hydraulics l 48 kubota

    Did you find out anything yet?

  9. #9
    J_J
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    Default Re: weak/slow hydraulics l 48 kubota

    I have seen more than a few BH's, and they all had a relief valve.

    What do you think would happen if you plugged in the pressure hose QD, and forgot to plug in the return or PB hose QD hose in a BH valve with out a relief valve. The main relief might catch the deadhead, might not.

    A BH valve with a relief would instantly sound off maybe protecting the hoses, valve and what else.

    If it did not have one, I would install an external relief valve.
    J.J.

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

    Git er done.

  10. #10
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    Default Re: weak/slow hydraulics l 48 kubota

    I'm sorry I have been busy working it, I got the dealer to print me a parts list out of the hydraulic system, since I have good pressure they want to run a flow test and check the suction screen, they did tell me the loader does not have a relief valve , there is one at the main block below the loader frame and one under the seat and one main in the backhoe control valve, it could be as simple as a bad o ring or debris in one of the quick disconnects, thanks for your help JJ and Lee John I'll post back when I get it figured out dale55

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