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  1. #1
    Silver Member
    Join Date
    Oct 2008
    Posts
    115
    Tractor
    Bx2230

    Default Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    It seems there are some differences between models when increasing hydraulic relief valve pressure. Here is the information from the BX 1830 / BX 2230 Workshop manual for increasing hydraulic pressure. I used my pictures because the WSM pictures are not very clear.

    Factory spec. for hydraulic relief valve activation is from 1778-1849 psi

    Shims are available in three thicknesses: .1mm (.0039 inch)
    .2mm (.0079 inch)
    .4mm (.0157 inch)
    pressure is increased approx. 39psi whenever the thickness of the adjusting shim is increased by .1mm.
    I added two .2mm shims, and re-torqued the relief valve plug to the factory spec of 28-45ft-lbs.


    Keywords : hydraulics pressure increase increasing 30 series kubota kabota BX Bx 1500 1800 1830 1850 22 2200 2230 2250 23 24 25 2660 Bx1500 Bx1800 Bx1830 Bx1850 Bx22 Bx2200 Bx2230 Bx2250 Bx23 Bx24 Bx25 Bx2660 subcompact sub-compact sub compact lift capacity loader FEL bucket
    Attached Thumbnails Attached Thumbnails -kubota-hydraulic-block-left-rear   -kubota-hydraulic-pressure-relief-valve   -kubota-pressure-relief-valve-spring   -kubota-pressure-relief-valve-torque  

  2. #2
    Gold Member
    Join Date
    Jun 2007
    Posts
    436
    Location
    MD and FL
    Tractor
    Kubota BX24

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    Same specs in BX24 WSM...
    John

    BX24-loaded R4s/60" MMM/rear bagger/arm rests, Woods RCC42, 3PT Splitter, TuffTop, Bro-Tek skidplates/thumb/ripper, BXpanded forks/bag, American Solutions grapple, Berlon mini-toothbar, home-made ROPS lights...more to come...

  3. #3
    Silver Member
    Join Date
    Mar 2005
    Posts
    211
    Location
    x
    Tractor
    x

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    The pictures are very simular to what my BX23 looks like too. Specs are the same as well. I set mine up to the 1850 PSI figure from a pre-adjustment measurement of 1620 PSI. In the process, I added about 0.4 mm the shim stack.

    Attached is a picture of the simple fixture used to check the pressure. The pressure difference was noticable.
    Attached Thumbnails Attached Thumbnails -img_3402a-jpg  

  4. #4
    Silver Member
    Join Date
    Oct 2008
    Posts
    115
    Tractor
    Bx2230

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    Update on hydraulic pressure adjustment: I have used my Bx2230 for a while now since adding two .2 mm shims to the hydraulic relief valve. Loader does a better job lifting out of a pile of dirt. That was my only complaint with the factory setting- the loader was a little slow coming out of a material pile. Now the loader operates as it should. The loader will raise the front of the tractor easily. Before the adjustment, I had to drive the tractor forward while lowering the bucket in order to lift the tractors front wheels.
    Mower, rear implements, and speed control pedal all work normally.
    Best of luck!

  5. #5
    Gold Member AceDeuce's Avatar
    Join Date
    Mar 2006
    Posts
    345
    Location
    Northern Virginia
    Tractor
    Kubota BX1500 w/ R1's and LA181 FEL

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    I'm getting ready to do my 400 hr service (actually a little overdue) and was planning on tuning up relief valve as part of the service. My question is---does this adjustment affect only the loader and other external hydraulics or will it also effect the HST?
    If you're gonna do it, do it right!

  6. #6
    Silver Member
    Join Date
    Mar 2005
    Posts
    211
    Location
    x
    Tractor
    x

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    I didn't notice any difference in the HST operation, after raising my releif pressure. The HST is driven by it's own pump. The increased pressure affects the loader, three point hitch and backhoe, or other loop hydraulics, if installed.
    I only increased mine by a couple of hundred pounds, but the difference was noticable.

  7. #7
    New Member
    Join Date
    Jul 2013
    Posts
    1
    Location
    whitesville ny
    Tractor
    kubota bx23

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    how can I increase hydraulic pressure on a bx23 kubota tractor

  8. #8
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,537
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    Do you know that it actually needs adjusting.

    If it is the first or only relief valve on the tractor, there is an adjusting nut close by the IN port on a loader valve and if at the rear for the 3pt, then you either turn the nut in or add shims to increase the pressure.

    You do need a hgage to do it right.

    About $30 to make a test set.
    Attached Thumbnails Attached Thumbnails -3000-psi-hyd-test-gage   -3000-psi-hyd-test-gage  
    J.J.

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

    Git er done.

  9. #9
    New Member
    Join Date
    Feb 2013
    Posts
    11
    Location
    New Jersey
    Tractor
    BX 23

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    Where is the best place to test for proper pressure? Can I use quick connect for BH under seat? I have a 04 BX23

    Thanks Anthony

  10. #10
    Super Member Scooby074's Avatar
    Join Date
    Aug 2006
    Posts
    6,393
    Location
    Nova Scotia
    Tractor
    BX 25, ZD 326

    Default Re: Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830

    just use the qa for the loader. Its downstream of a control valve

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