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  1. #1
    Veteran Member deerefan's Avatar
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    Aug 2005
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    louisiana
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    1952 8N, 2005 JD 5103

    Default Rebuilding hydraulic pump 1952 8N

    How involved is this? The hydraulics are getting real weak, struggles to lift my 4ft bushhog. I have good basic mechanical skills and basic hand tools, some air tools.

  2. #2
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Rebuilding hydraulic pump 1952 8N

    about 4 hrs to drop the pump R&R and put it back in.

    I'd spend another 4 hrs and go thru the hyd cover as well.

    many times a weak lift is a combo problem. worn pump, weak relief,a dn a very leaky piston cycl.

    a leaky piston can cause a weak lift even if the pump is good as it maxes out at 1700 psi and 2.85 gpm with the engine screaming. if the leak is huge fromt he a bad hydro piston.. you won't get much lift.

    you may or may not need a cyl.. I'd plan on a new piston, oring and backup washer.. top cover gasket.. 3 gaskets under the cyl.. pto flange gasket.. inspection cover gasket.. hyd pump lower gasket.. new relief valves.

    if the pump chambers need repalcing you will need gaskets and parts for them.

    have an fo-4 I&T manual on hand. you can fo this via cook book.

    trhis is a good time to clean the rear sump singe the pto shaft comes out.

    check it's seal as well.

  3. #3
    Super Member 94BULLITT's Avatar
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    Default Re: Rebuilding hydraulic pump 1952 8N

    Do you have water in your your oil?

  4. #4
    Veteran Member deerefan's Avatar
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    1952 8N, 2005 JD 5103

    Default

    Quote Originally Posted by 94BULLITT
    Do you have water in your your oil?
    Thanks Soundguy. No, no water in the oil. I will start on this soon and post back results.

  5. #5
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Rebuilding hydraulic pump 1952 8N

    post if you hit a snag.

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