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  1. #1
    New Member
    Join Date
    Oct 2013
    Posts
    11
    Location
    Naples, FL
    Tractor
    1967 Case 580CK

    Default How to rebuild backhoe model 33 valve control box?

    Hi guys, first post! I need some help!

    I recently bought my neighbors 1967 580CK with a 33 backhoe for 2k. besides some rotted hoses and tire issues the biggest problem is the leaks at the backhoe control valves.
    I couldn't test it because of some busted hoses and it was also way to dirty in there to see anything.

    So I uninstalled the whole valve body and cleaned it nicely but now I'm not sure how to proceed.. which seals to replace? Ideally I'd like to replace them all, but an online parts store told me there are 200+ seals in there and it could run me $8-900 to buy them all.. I looked t the diagram in the Case parts website though and I could only see about 10-11 seals/valve so no more than 70-80 seal for the whole thing.

    -2qclch0-jpg

    What say you?
    Should I take the whole thing apart and replace only the damaged seals?
    Or install it back now that it's cleaned and the hoses are fixed to see where it leaks?

    Thanks in advance for any advice!

  2. #2
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    17,111
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: How to rebuild backhoe model 33 valve control box?

    I would recommend putting it back together and see where the leaks are.

    There are 3 to 4 o-rings between each section.

    There are o-rings on each spool top and bottom.
    J.J.

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

    Git er done.

  3. #3
    Elite Member
    Join Date
    Jan 2010
    Posts
    2,585
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: How to rebuild backhoe model 33 valve control box?

    Since you have already removed the valve assembly any way you apply pressure to the inlet and see what leaks? Build pressure slowly in case you missed plugging a flow path. Seals between the sections are typically the pressure and tank lines and can flatten and harden from time and heating cycles.
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  4. #4
    New Member
    Join Date
    Oct 2013
    Posts
    11
    Location
    Naples, FL
    Tractor
    1967 Case 580CK

    Default Re: How to rebuild backhoe model 33 valve control box?

    Thanks guys.
    I replaced the spool seal since I already had them ordered, put it all back together and it works, no leaks!

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