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  1. #21
    Epic Contributor MossRoad's Avatar
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    South Bend, Indiana (near)
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    Power Trac PT425 2001 Model Year

    Default Re: PT Steering Project

    The current steering valve provides hydraulic pressure to the loader aux pto valve through a power beyond port if you remove the steering valve you will have to find a new power source for the loader aux pto valve. It also provides steering priority over that valve. You need a power source for the loader valve so why not off of the new steering valve
    MossRoad

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  2. #22
    Gold Member Clumber's Avatar
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    Northern Virginia
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    PT425 (Dec 2010)

    Default Re: PT Steering Project

    As MossRoad said, the main use/need of a spinner knob is one handed turning while operating the loader... However, I rarely use the knob anymore. I have weak wrists and it get painful after a while. There seems to be more "resistance" to turning from the steering wheel than seems necessary for hydraulic steering. Even frequent two hand turning is tiresome sometimes. Does anyone know what causes the resistance? Is it tune-able? I will watch this thread with interest. I think that the handle bar and the "stick" approaches are worth consideration.
    I married me a hippy, ran away with a stringy haired blond,
    Now we're both old and happy, fishing on our own Golden Pond. -- Merle Haggard


    PT 425 (Dec 2010), Blade, Snow Blower, Sweeper, Spreader, LMB, 4n1, Small Bucket/Teeth, Utility Grapple, Brush Cutter, Box Blade, Mini Hoe/Thumb, Forks, Power Dumper

  3. #23
    Platinum Member
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    N Central PA
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    PT 422

    Default Re: PT Steering Project

    Spinner knob is a must have for me too. I understand the comments on how it may be detrimental to some users. Personally, I get more wrist pain from using a computer mouse than I do the knob.
    If diamonds are a woman's best friend then why does man's best friend like to drink from the toilet??

  4. #24
    Elite Member woodlandfarms's Avatar
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    Los Angeles / SW Washington
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    PowerTrac 1850

    Default Re: PT Steering Project

    So I don't know squat about hydraulics compared to JJ and the rest of the gang, but I wonder if there would be a better control system than agricultural hydraulics. Maybe aircraft or manufacturing controls where control is much more precise and necessary.

    I feel you can do this but IMO you are going to have to cut off the control panel, probably where it attaches to the body and fab up a new goer with new guage positions .
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  5. #25
    J_J
    J_J is offline
    Super Star Member J_J's Avatar
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: PT Steering Project

    For those that have never seen the inside of a steering valve. This one does not have the PB port.

    Char-Lyn Hydraulic Steering Valve Autopsy - YouTube
    Last edited by J_J; 12-23-2012 at 11:47 AM.
    J.J.

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

    Git er done.

  6. #26
    Epic Contributor MossRoad's Avatar
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    South Bend, Indiana (near)
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    Power Trac PT425 2001 Model Year

    Default Re: PT Steering Project

    Well, for starters, the machines steer much more easily at full throttle. 3600 RPM gas engines are meant to be run at 3600 RPMs, so make sure you're running at full throttle. Anything less and you aren't running the engine's cooling fan fast enough to keep the engine cool, which can lead to heat build up in the engine and lessen engine life.

    2nd, I wonder if a larger diameter steering wheel would help? More leverage = easier turning. Some math genius here do the calculations and see how much leverage you would gain with a 1" or 2" diameter gain in a steering wheel.

    Or, let's post pictures of where the spinner knobs are mounted.

    Here's mine. It's a tad inside the ring of the steering wheel. I wonder if mounting it farther out from the center would gain significant leverage to decrease the force needed to turn the wheel. Of course, you'd have to be sure your won't be smacking the joystick with your knuckles.
    8792d1035743354-pt-additions-modifications-54-205404-spinner.jpg
    MossRoad

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  7. #27
    J_J
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: PT Steering Project

    Aircraft , tanks and a lot of things use HYD because it is the best thing for low power input to high power output at the moment.

    On the subject of spinner knobs, I always mount mine at about the 270 degree position with wheels pointed at 000.
    J.J.

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

    Git er done.

  8. #28
    Platinum Member
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    Eastern PA
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    PT 1845, Bobcat A300, JD Trail Gator

    Default Re: PT Steering Project

    Quote Originally Posted by stray View Post
    Why does one need a Power beyond valve if one dosn t use the lift valve while steering? I don t think you would but that may be hard to keep form doing.
    I think the use of power beyond ensures that steering has priority over lift/tilt. Because steering and lift/tilt are powered by the same pump, and because safety demands steering priority(in my opinion), then the appropriate implementation is power beyond rather than feeding steering and lift/tilt directly from the common pump.

  9. #29
    Epic Contributor MossRoad's Avatar
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    Power Trac PT425 2001 Model Year

    Default Re: PT Steering Project

    Right. Think about if your ran one pressure hose to the front of the tractor and put a TEE in it to feed a steering valve and the loader valve. You're steering along and open the FEL valve and your steering goes bye-bye without some sort of priority flow divider. Why add a priority flow divider when you can get the same effect with one valve that has a power beyond port?
    MossRoad

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  10. #30
    Platinum Member
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    Jan 2004
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    east TN
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    Power-trac 422 January 2003 model

    Default Re: PT Steering Project

    Ok so at this I do not really need a power beyond valve. Right? Just do not expect to steer while lifting, curling or locking a quick plate in. Or is there more to it than that? In this project let us say to avoid confusing that the steering valve must be removed and a leaver installed.
    Also I do understand about the full throttle rpm thing helping the steering valve operate easer. I even redesigned the spinner knob to be further out than the one moss pictured. You just want see the reasoning behind this project till consequences happen to you. If you have the power in your arm with no pain you are just going to keep cranking the wheel. As did I. It might be this never takes enough toll on you to be a concern. I know this. Good Luck! The thing is steering must go and leaver is to be installed. That is my reality.
    Thanks for covering these other things just want to keep on the track I intended. Steering NO-- Leaver YES. Now someone write another paragraph on the advantages of a steering valve. That would be hilarious (funny). LOL. Love you guys. Merry Christmas.
    PS. seriously don t mind me. Talk about steering wheels all you want to. I am having a good time here.

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