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  1. #41
    Epic Contributor RoyJackson's Avatar
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    Nov 2001
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    20,367
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    Bethel, Vermont
    Tractor
    John Deere 4520 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: HST vs. Shuttle Shift?

    Quote Originally Posted by beppington View Post
    I don't think that's correct, as I stated in post #31 above. HST's seem to "rob", or utilize, about 1.5 HP more of the engine's HP than non-HST machines.

    The exact same tractor as my HST in non-HST format has 1.5 more PTO HP than mine, & I've encountered that same 1.5 HP difference many times.
    Yep, if the specs show both engine and PTO HP ratings, and a tractor is available with both gear and HST transmissions, the HST is alway a couple PTO HP lower. I'd estimate around 5-8 percent, n the average.
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

  2. #42
    Bronze Member US American's Avatar
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    Feb 2011
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    69
    Location
    NW Washington
    Tractor
    JD 4320 Reverser

    Default Re: HST vs. Shuttle Shift?

    I should have said it doesn't degrade pto power greatly. The difference in drawbar power, on the other hand, is very noticeable. My misstatement.
    JD 4320 Reverser R1s w/ 400x loader

  3. #43
    Gold Member LMan1967's Avatar
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    May 2011
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    275
    Location
    Kudzu, Alabama
    Tractor
    MF 1643

    Default Re: HST vs. Shuttle Shift?

    drawbar HP?
    Proverbs 31:6-7
    Lord, help me to be the kind of person my kudzu thinks I am.

  4. #44
    Epic Contributor RoyJackson's Avatar
    Join Date
    Nov 2001
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    20,367
    Location
    Bethel, Vermont
    Tractor
    John Deere 4520 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: HST vs. Shuttle Shift?

    Quote Originally Posted by LMan1967 View Post
    drawbar HP?
    Yep...pretty common measure of pulling power. I've never seen this metric used with CUTs, but larger tractors are rated by drawbar HP.
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

  5. #45
    Gold Member LMan1967's Avatar
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    May 2011
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    275
    Location
    Kudzu, Alabama
    Tractor
    MF 1643

    Default Re: HST vs. Shuttle Shift?

    Quote Originally Posted by RoyJackson View Post
    Yep...pretty common measure of pulling power. I've never seen this metric used with CUTs, but larger tractors are rated by drawbar HP.
    ack...theres just too much to learn...
    Proverbs 31:6-7
    Lord, help me to be the kind of person my kudzu thinks I am.

  6. #46
    Epic Contributor
    R.I.P.
    jinman's Avatar
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    Feb 2001
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    21,014
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    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: HST vs. Shuttle Shift?

    I think the reason the HST tractors always show a bit less HP at the PTO than non-HST tractors is that the HST charge pump always runs if the engine is running. Keeping the charge pump running and the HST pump flowing enough oil to lube and cool the transmission will take a small amount of HP even if the PTO power train goes straight through the HST transmission and the tractor is not moving. Of course the PTO HP numbers are maximum numbers anyhow, with the tractor not moving. When you are driving, the transmission and geartrain supplying power robs engine HP, and the PTO available HP drops. Even without a heavy load, you'll rob power from the PTO.
    Jim


  7. #47
    Super Star Member
    Join Date
    Feb 2008
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    11,138
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    somewhere usa
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    Deere 110tlb, 4520, x749, x758, L130

    Default Re: HST vs. Shuttle Shift?

    Quote Originally Posted by LMan1967 View Post
    ack...theres just too much to learn...


    Simple thing to do is try out an hst and you will find out how easy it is to use.

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