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  1. #1

    Join Date
    Jan 2004
    Posts
    7
    Location
    MI.

    Default 1948 8n hydraulics

    I inherited a 48 8n,problem is the hydraulics didnt work for about 10yrs.the draft hook up was broke off and water got into the fluid after sitting out.after working on it ,changing fluid the hyd now lift but wont hold when clutch is in,also wont lower unless you put some weight on it.Any ideas or is a total rebuild of hyd system in order.what about the ram? thanks ,Joe

  2. #2
    Veteran Member
    Join Date
    Dec 2002
    Posts
    1,070
    Location
    Western Washington
    Tractor
    5300 JD 4X4

    Default Re: 1948 8n hydraulics

    Pull the top deck under the seat. you will know your worries then. Chances are that the ring around the piston has failed and is letting oil bypas the piston or the bore is pitted to the point of being useless. If you are having to put pressure on the links to bring it down I would have to say that it might be rusted inside. let us hope not. Maybe you can polish it up with a cylinder hone.

  3. #3
    Epic Contributor Soundguy's Avatar
    Join Date
    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: 1948 8n hydraulics

    Sounds like relief valve. Lots of times when the lift leaks while the pump isn't spinning is the relief.

    Here's a quick check... pull the right side dipstick cover, with the lift engaged and some weight on it.. pto turning, etc... use a flashlight, and look up at the inside under the top cover... excessive oil bypassing the cylinder will be rings. If you see squirts from the sides, there may be a blown gasket on the standpipe that sends the hyd oil up to the cylinder. Also a possibility of a blown gasket at the pump. If you see a swirl in the oil.. could be relief.
    Caution... don't stick your hands in... just look in.]

    Also. you will notice that under the seat is a little lever... up for position control.. horizontal for draft control. Since you say the toplink rocker and spring assembly was damaged... i would assume only the position control setting would work.

    Soundguy

  4. #4
    Veteran Member
    Join Date
    Jun 2002
    Posts
    1,044
    Location
    Southwest PA
    Tractor
    Deere 4710/reverser, JD 318 (still needs TLC), JD LT160

    Default Re: 1948 8n hydraulics

    There is a great video out on repairing old Ford hydraulic systems. A (moving) picture is worth a thousand words. Got the one for the NAA for my father-in-law. Seemed to be very helpful, lots of common symptoms/cure type info. There's a different video for the 2N/9N/8N group.

    Most of the 'restoration' places catering to the old Ford tractors seem to carry them.

    Tim

  5. #5

    Default Re: 1948 8n hydraulics

    You don't see to many old fords that will hold a load with out the pump pumping

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    47,501
    Location
    Central florida
    Tractor
    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: 1948 8n hydraulics

    My 52 8n will drop the 3pt in a bit less than a minute... the NAA will hold it up hours, and my 2n will hold it up at least a week before it has even drooped a few inches.... wish the 8n were like that...


    Soundguy

  7. #7
    Gold Member
    Join Date
    Oct 2003
    Posts
    372
    Location
    Bakersfield Ca.

    Default Re: 1948 8n hydraulics

    The relief valve on the Ferguson pump? On the 8N that drops fast.
    Chuck M.

  8. #8
    Platinum Member
    Join Date
    Jul 2003
    Posts
    594
    Location
    mid-south idaho
    Tractor
    Kuota L3130, Ford 9-n, Allis AC, and a JD 4020 with powershift

    Default Re: 1948 8n hydraulics

    just did one on a to35 last week. Early style scottish tie pump. 3 piont would fall in less than 30 sec. Replaced the pump with new pump, honed the lift cylinder and nwe piston and rings. Now it will hold for a week with little or no fall of the three point.

    The previous owner did not pay attentension to the type of oils he ran in the tractor. Makes a bunch of difference IMO.

    While we were at it we replaced the clutch and the transmission input shat seals. Lots of work, but he now knows what he has and can take care of it and it should last for years to come.

    The old fords suffer from the same type of problems many times. I have a 8N that I will do the same job in the spring.

    Dane

  9. #9
    New Member
    Join Date
    Mar 2012
    Posts
    2
    Location
    longbeach ms
    Tractor
    1948 8n ford

    Default Re: 1948 8n hydraulics

    i bought a 48n knowing the hydraulic didnt work. changed oil cleaned sump and still wont lift. opened right acess and reached around to find the left side of lift control arm broke.what consists of removing the top cover. thanks for your help

  10. #10
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    Location
    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: 1948 8n hydraulics

    on an 8n? pulling top cover?

    remove seat, then remoe bolts around perimiter only.. don't pull the 4 inner ones.

    lift cover comes right out / up.

    have a new gasket for the cover, available. nop rtv or goops.

    if you need / want more info, post back.

    r&r of N hyds is EZ... btdt..

    soundguy

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