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  1. #1
    Veteran Member
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    Jan 2002
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    1,561
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    South East Michigan
    Tractor
    New Holland TC30 Hydro 4x4, Gravely Zero Turn Mower

    Default Hydrostatic Steering

    Recently, there was a thread about the difference between power steering and hydrostatic steering. My NH TC30 has no mechanical linkage between the steering wheel and the front wheels. Only two hoses and a cylinder provide the steering connection. This, I understand, fits the description of hydrostatic steering. That being said, here's my question.... With the engine switched off, I can turn the steering wheel (with some effort) and I am able to get a small steering response in the front wheels. This indicates to me that there is some 'pump' effect in the steering system. Would anyone care to explain how this works?

  2. #2
    Gold Member
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    Feb 2001
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    436
    Location
    Mississippi
    Tractor
    Kubota M-4900

    Default Re: Hydrostatic Steering

    I think I was the one who started the thread about the diffences between the two systems. I understood the difference but didn't (and still don't) understand why the hydrostatic steering is supposed to be superior to power assisted steering.

    In response to your question, I believe the limited movement you get is from residual pressure in your system. I get some of the same thing from my Bota as it is brand new.

    I had an old International 444 whose hydraulics were completely shot. The pump provided enough pressure to steer it when the tractor was running but as soon as you shut it off the 3ph started falling and the steering was gone. You could spin the steering wheel like a top in both directions.

    I have some land about 2 1/2 miles from my house and have to travel on a pretty busy highway to get to it. I always wondered what would happen if I suddenly lost hydraulic pressure on my old tractor. I know for a fact my steering would be rendered useless. Would I be able to safely stop it before I ran in a ditch or crossed the yellow line into oncoming traffic? Scary thought. And this is supposed to be better than power assisted steering? I don't think so.

    Sorry for the rambling.

    TBone

  3. #3
    Platinum Member BTI's Avatar
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    Feb 2002
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    756
    Location
    Nelsonville, Ohio
    Tractor
    Haven't decided yet......It'll be a Kioti None the less

    Default Re: Hydrostatic Steering

    Kioti's are the same way if you turn the wheel with the tractor off the wheels still turn, the effort to do so must be increased but in a panic or emergency situation I think I could find PLENTY of strength to turn that wheel. [img]/w3tcompact/icons/shocked.gif[/img]
    BTI

  4. #4
    Gold Member
    Join Date
    Feb 2001
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    436
    Location
    Mississippi
    Tractor
    Kubota M-4900

    Default Re: Hydrostatic Steering

    It doesn't matter how strong you are, if you have hydrostatic steering the hydraulic pressure determines how much steering you have. There is no mechanical connection between the steering wheel and the wheels.

    I suspect your tractor may have power assisted steering which can still be steered by brute force without the hydraulics' assistance.

    TBone

  5. #5
    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: Hydrostatic Steering

    Are there no systems that are hyd steering, that also have a manually actuated pump (by steerring wheel motion ), yet also have no drag link?

    thought I had heard that this 'thing' existed.. but could be mistaken.

    Soundguy

  6. #6

    Join Date
    Dec 2001
    Posts
    193
    Location
    Mexico City
    Tractor
    NH TC21D

    Default Re: Hydrostatic Steering

    Jerry - You're correct that your NH TC tractor has what is generally refered to as "hydrostatic steering", and that it has no mechanical linkage from the steering wheel to the front tires. The reason why your tractor still has some steering when off is that the steering wheel is connected to a small rotor pump, that pushes oil into the steering system. For safety reasons, this pump also will act directly on the front axle when the power is off. However, you might of noticed, that steering with the power off takes considerable effort.

  7. #7
    Gold Member
    Join Date
    Feb 2001
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    436
    Location
    Mississippi
    Tractor
    Kubota M-4900

    Default Re: Hydrostatic Steering

    Soundguy I honestly don't know. The ones I have owned have not been set up that way. I would be interested to know if this "thing" did exist.

    TBone

  8. #8
    Gold Member
    Join Date
    Feb 2001
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    436
    Location
    Mississippi
    Tractor
    Kubota M-4900

    Default Re: Hydrostatic Steering

    Well, you live and learn. It sounds like the newer tractors have a system that does allow you to "pump your own" hydraulic pressure in the event of power loss. Thanks for explaining that one.

    TBone

  9. #9
    Veteran Member
    Join Date
    Jan 2002
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    Location
    South East Michigan
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    New Holland TC30 Hydro 4x4, Gravely Zero Turn Mower

    Default Re: Hydrostatic Steering

    Sounds reassuring. [img]/w3tcompact/icons/smile.gif[/img]

  10. #10
    Veteran Member
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    Apr 2000
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    1,589
    Location
    Western New York
    Tractor
    Kubota B2710

    Default Re: Hydrostatic Steering

    Thats how the steering works in my Zamboni. The pump is right on the back of the steering wheel and has the lines going up front to a hydro. cyl. I can steer when the motor is off, but it is hard.

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