PTO HP vs motor HP confusion on 1023 in practice....
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Thread: PTO HP vs motor HP confusion on 1023 in practice....

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    tommott77's Avatar
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    Question PTO HP vs motor HP confusion on 1023 in practice with hydrostatic....

    Hi all,

    I was looking around for a small flail mower that would work with my little 1023. In my search I found a 41" flail that required an ambiguously stated 18HP. I contacted the seller to see if the 18hp was for engine or PTO HP. The response I got from the seller was as follows....

    " If it is a geared tractor then the 18 hp is PTO if it is hydrostatic then it is engine. The reason is the hydro can set engine speed / pto separate of the forward speed."

    I have yet to buy any PTO driven implements 1023, and this distinction is news to me. I believe that my 1023 has around 14-15 pto hp. Any thoughts as to if what the seller is saying holds water, and/or if I'd be ok as the seller states in actual practice?
    Last edited by tommott77; 04-24-2017 at 05:39 PM.
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    Senior GTT Super Slacker Gizmo2's Avatar
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    In my experience if the PTO driven implement is rated by HP it is a requirement of tractor PTO HP.
    Last edited by Gizmo2; 04-24-2017 at 06:34 PM.
    Keith

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    jgayman's Avatar
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    Quote Originally Posted by Gizmo2 View Post
    In experience if the PTO driven implement is rated by HP it is a requirement of tractor PTO HP.
    What ^^^^^ he said.

    " If it is a geared tractor then the 18 hp is PTO if it is hydrostatic then it is engine. The reason is the hydro can set engine speed / pto separate of the forward speed."


    The comment made by the seller makes no sense. PTO HP is PTO HP, it makes no difference whether hydro or geared. And to the best of my knowledge, ALL tractors, regardless of transmission type can set their engine speed/PTO speed separate from forward speed.
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    tommott77's Avatar
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    That's what I had figured originally, but they had some other implements rated differently.

    Anybody heard of this type of distinction of hp differences though with having a hyrdostatic vs geared tractors though? Not sure if I should take this guy for his word or look for something smaller.
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    56FordGuy's Avatar
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    Back in the day, tractors were rated by PTO HP and drawbar HP. The drawbar rating isn't used much anymore, at least not on smaller tractors. Engine HP ratings are the brainchild of someone with a marketing degree that's never set foot on a farm.

    The reason engine HP numbers are pretty much worthless is due to the drivetrain. A geared tractor will have less parasitic loss through the drivetrain so a 20 HP engine might put 18 to the PTO. A hydrostatic drivetrain has a higher parasitic load so that same 20 HP engine in a hydro tractor may only put 15 HP to the PTO because running the hydro pump saps more power than a clutch and gears. I'm just making up numbers to illustrate the principle, but at the end of the day when shopping for PTO implements you need to match them to the PTO HP your tractor has.
    -Blake

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    Senior GTT Super Slacker Gizmo2's Avatar
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    Drawbar HP.
    Haven't heard that in a loong time, never did completely understand it.
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    Keith

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    Old Pa-pa Old Cajun's Avatar
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    My little 1982 IH 274 is rated 30 HP Nissan engine, but 27.4 HP PTO.
    All gear driven.

    Guess that's why it's named a 274.
    Neil

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    Quote Originally Posted by Gizmo2 View Post
    Drawbar HP.
    Haven't heard that in a loong time, never did completely understand it.
    It relates to the actual pulling power of the tractor. Takes in many factors including engine HP, weight of the tractor, and gear ratios.
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    Senior GTT Super Slacker Gizmo2's Avatar
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    Quote Originally Posted by greenharley View Post
    It relates to the actual pulling power of the tractor. Takes in many factors including engine HP, weight of the tractor, and gear ratios.
    Well there ya have it. Exactly why I never understood it.
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    Keith

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    Quote Originally Posted by Gizmo2 View Post
    Drawbar HP.
    Haven't heard that in a loong time, never did completely understand it.
    Or belt HP.. Maybe some of you old geezers can relate to that.

    Sent from my LGL52VL using Tapatalk

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