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  1. #1
    New Member
    Join Date
    Aug 2013
    Elbridge, New York
    Ford 753 Backhoe

    Default Control unit on ford 753 backhoe

    I have a Ford 753(series) T9-389(component) 3827(serial) backhoe mounted on a 1966 Ford model 4000 numbers C1Z76ZZ 6BZ 440Z16 gas 3cyl tractor.
    This means it is a 47 year old machine, but it still digs and works. My problem is that there is a pretty good hydraulic leak coming from the backhoe control unit located under backhoe seat. I have replaced about half of the hoes, but the rest are original. The leak seems to occur when I am pulling the arm back toward the tractor under pressure. It does not seem to be leaking where the hose connects to the control unit. My questions are is there any other place it could be leaking besides the hose connection??? Is there any place where I might purchase a new or reconditioned control unit????

  2. #2
    Veteran Member joecdeere's Avatar
    Join Date
    Apr 2002
    1948 Allis UC Hi-Crop Cane 1941 Allis WC 1948 Allis G 1948 Allis G 1949 Allis G 1954 Allis G 1959 Ferguson TO-35 1972 MF 135 1979 Power King 2418 1989 Ford 345C TLB

    Default Re: Control unit on ford 753 backhoe

    there are seals in each spool, along with if it was a multi piece valve there were o-rings between each section

    here's a look at the one piece style

  3. #3
    New Member
    Join Date
    Aug 2013
    Elbridge, New York
    Ford 753 Backhoe

    Default Re: Control unit on ford 753 backhoe

    Thank you very much.....

  4. #4
    Super Star Member LD1's Avatar
    Join Date
    Apr 2008
    Central Ohio
    Kubota MX5100

    Default Re: Control unit on ford 753 backhoe

    I will say it is very hard to pinpoint leaks on a control unit/spool assembly. the seals arent that expensive, I'd replace all the ones on the spools for sure.

    And they might not be standard o-rings either. Not sure on yours, but my 5500 valves had quad seals. Which is kinda like an 0-ring but a square-ish cross-section
    ".........there is only one way to find out."
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  5. #5
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Control unit on ford 753 backhoe

    You could be leaking from a number of places.

    Here is a suggestion.

    Clean all the fluid from the control valve.

    Go to NAPA or wherever and get some fluorescent dye and put in the hyd system, and use the BH a while. Work each function.

    Then in low light or darkness, use a black light and shine it on the control valve.

    The leak should fluoresce and glow yellowish green.

    Each spool has three opening, top, bottom, and load check valve.

    Each port. IN, TANK ,maybe PB

    A pin hole in a hose.

    Bad fitting.

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

    Git er done.

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