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  1. #1
    New Member
    Join Date
    Mar 2009
    Posts
    17
    Location
    Central Ma.
    Tractor
    B3300su

    Default B3300su Hydraulic Pressure Relief

    Hi,
    I figured i would try to post this here first.
    I want to check the pressure relief on my b3300su with loader and backhoe.Ive had it for alittle over a month now and Both seem alittle weak...when compared to my Yanmar 1500d.
    I ordered a gauge to check the pressure and it should be here this week.
    I am not sure where the pressure relief valve is? I would guess that shimming the loader valve would increase the pressure for both loader and backhoe?
    My owners manual says 2205psi for the loader....but cant find what the pump pressure is.
    I have been reading alot on here about hydraulics...but not much for my machine

    Thanks
    David

  2. #2
    Veteran Member
    Join Date
    Jun 2004
    Posts
    1,679
    Location
    Northeast MA
    Tractor
    Kubota B3200 with BH77 backhoe, Kubota B50 SSQA w/ 54" & 60" buckets, LandPride FDR1660

    Default Re: B3300su Hydraulic Pressure Relief

    Quote Originally Posted by dtherrien View Post
    Hi,
    I figured i would try to post this here first.
    I want to check the pressure relief on my b3300su with loader and backhoe.Ive had it for alittle over a month now and Both seem alittle weak...when compared to my Yanmar 1500d.
    I ordered a gauge to check the pressure and it should be here this week.
    I am not sure where the pressure relief valve is? I would guess that shimming the loader valve would increase the pressure for both loader and backhoe?
    My owners manual says 2205psi for the loader....but cant find what the pump pressure is.
    I have been reading alot on here about hydraulics...but not much for my machine

    Thanks
    David
    Do some searching here on TBN - there's been a number of threads about upping pressure to improve loader performance. I did the check on my B3200 (basically the same tractor as your B3300) - and found that the pressure was a little low on mine. Never got around to upping the pressure - if I remember correctly the pressure relief valve is in the hydraulic ports on the pumpkin under the seat. I'm at work now or I could pull the info up to verify that memory.

  3. #3
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
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    2,069
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: B3300su Hydraulic Pressure Relief

    The relief is under the right side console. It is in the loader valve. The one relief does the whole system. Unless there is one in the bh valve but either way the loader valve controls the whole system. Very easy to adjust.
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    Case 590SM-2
    JD 310D TLB
    Ford 555D sold
    Gehl 602 excavator

  4. #4
    New Member
    Join Date
    Mar 2009
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    17
    Location
    Central Ma.
    Tractor
    B3300su

    Default Re: B3300su Hydraulic Pressure Relief

    Thanks for the replies.
    Yes... the pressure relief on the loader valve controls the backhoe too. I removed the back tire to get a better look at it and you can see the power beyond goes to the backhoe.
    Harry at BXpanded helped me out too.
    When i get the gauge...I will take pictures of the whole process. Not much for info with pictures on the b3300 series. Next will be the injector pump timing.

  5. #5
    Super Star Member J_J's Avatar
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    Sep 2003
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    16,456
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    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: B3300su Hydraulic Pressure Relief

    If you have a FEL and BH mounted, then you probably have three reliefs, including the 3pt, and should be set the same.

    You should know the pumps max pressure and set it to about 50 to 100 psi below the pumps max pressure. If you want less pressure at the BH, you can do it by adjusting the relief valve on the BH valve.
    J.J.

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

    Git er done.

  6. #6
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
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    2,069
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: B3300su Hydraulic Pressure Relief

    Quote Originally Posted by J_J View Post
    If you have a FEL and BH mounted, then you probably have three reliefs, including the 3pt, and should be set the same.

    You should know the pumps max pressure and set it to about 50 to 100 psi below the pumps max pressure. If you want less pressure at the BH, you can do it by adjusting the relief valve on the BH valve.
    The 3pt has a max breakout relief to protect it from shock loads but it has no involvement with the actual function of the 3pt. Just an emergency blow off and is self contained. Other than that the only other relief is in the loader valve which controls the whole system. Max pump pressure is governed by this relief. If it fails closed for some odd reason then the pump could go to max developed pressure.
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    Case 590SM-2
    JD 310D TLB
    Ford 555D sold
    Gehl 602 excavator

  7. #7
    Gold Member
    Join Date
    Oct 2004
    Posts
    278
    Location
    Ohio
    Tractor
    Ferguson TO 20, Kubota B3300, BH77

    Default Re: B3300su Hydraulic Pressure Relief

    Quote Originally Posted by dtherrien View Post
    Thanks for the replies.
    Yes... the pressure relief on the loader valve controls the backhoe too. I removed the back tire to get a better look at it and you can see the power beyond goes to the backhoe.
    Harry at BXpanded helped me out too.
    When i get the gauge...I will take pictures of the whole process. Not much for info with pictures on the b3300 series. Next will be the injector pump timing.
    Will look forward to your photos of the process.

  8. #8
    New Member
    Join Date
    Mar 2009
    Posts
    17
    Location
    Central Ma.
    Tractor
    B3300su

    Default Re: B3300su Hydraulic Pressure Relief

    Just out of curiosity...where is the relief for the 3ph? And does it adjust the same way..with shims?
    Right now i dont think i would have a need to adjust it...but never know.
    The backhoe will be on 95% of the time.

  9. #9
    Veteran Member kuboman's Avatar
    Join Date
    Dec 2009
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    2,069
    Location
    Canada
    Tractor
    B3200, L5740,

    Default Re: B3300su Hydraulic Pressure Relief

    Quote Originally Posted by dtherrien View Post
    Just out of curiosity...where is the relief for the 3ph? And does it adjust the same way..with shims?
    Right now i dont think i would have a need to adjust it...but never know.
    The backhoe will be on 95% of the time.
    It is buried in the 3pt circuit and no it is not adjustable. You wouldn't want to mess with it anyway.
    L5740 LA854 loader
    L3130 LA723 loader sold
    B3200 LA504 loader
    B1550 sold
    B2620 sold
    B4200 sold
    F2680E
    GF1800
    Kubota RTV900
    JD 850D Gator sold
    JD F935 x 2 sold
    Case 590SM-2
    JD 310D TLB
    Ford 555D sold
    Gehl 602 excavator

  10. #10
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    16,456
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: B3300su Hydraulic Pressure Relief

    Quote Originally Posted by kuboman View Post
    The 3pt has a max breakout relief to protect it from shock loads but it has no involvement with the actual function of the 3pt. Just an emergency blow off and is self contained. Other than that the only other relief is in the loader valve which controls the whole system. Max pump pressure is governed by this relief. If it fails closed for some odd reason then the pump could go to max developed pressure.
    Do you have a relief valve on your hyd block?
    J.J.

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

    Git er done.

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