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  1. #1
    Member
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    Oct 2010
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    Australia
    Tractor
    JD 455

    Default PTO from hydraulic motor

    I have a JD with auxillery hydraulic ports but without a rear PTO. You can buy a rear PTO kit for this machine but they are no longer sold in Australia and are very expensive. I was thinking about using the machines aux hydraulic port and control valve to run a hydraulic motor that acts as a rear PTO. I have found a few motors at surplus centre that run about 500-600 rpm and provide the adequate torque for my purposes. A link to a motor I had in mind is here.

    I was just wondering has anyone attempted this before?

    And what coupler is required to fit the pump shaft to a PTO shaft.

    Thanks
    Matt

  2. #2
    Super Star Member J_J's Avatar
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    Sep 2003
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: PTO from hydraulic motor

    What is the hyd pressure on your pump? Do you have enough hyd flow to run that motor efficiently?

    * Dynamic Model Number JPPS-125 H4-K-P
    * Displacement 7.7 cu.-in./rev.
    * Pressure
    1400 PSI Cont.
    2000 PSI Int.
    * Torque
    1354 Cont. in.-lbs.
    * Speed
    512 RPM Cont.

    * Flow
    18 GPM Cont.

    I believe Surplus Hyd also has the splined coupler
    J.J.

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

    Git er done.

  3. #3
    Super Star Member J_J's Avatar
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: PTO from hydraulic motor

    5 GPM and 7.7 cu in, speed of hyd motor would be about 150 rpm
    J.J.

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

    Git er done.

  4. #4
    Member
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    Oct 2010
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    Location
    Australia
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    JD 455

    Default Re: PTO from hydraulic motor

    Looks like I have mixed up my l/min with gpm.

    The manual states the charge pump flow is 17.0 L/min (4.5gpm) observed
    and the relief valve 1066 psi

    its a JD 455. They operate FEL's from these ports usually.

  5. #5
    Member
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    JD 455

    Default Re: PTO from hydraulic motor

    Are these numbers too low to have a rear PTO with an rpm close to 540rpm.

  6. #6
    Super Member rswyan's Avatar
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    Northeast Ohio
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    Kubota B2910, Simplicity 18 CFC, Cub Cadet 782

    Default Re: PTO from hydraulic motor

    Quote Originally Posted by BrisMatt View Post
    Are these numbers too low to have a rear PTO with an rpm close to 540rpm.
    No - but they are too low to have a rear PTO with any kind of power behind it at that speed.

    4.5 GPM of flow run thru a motor with a displacement of 1.92 cu. in. yields 541 rpm

    but .... a motor with a displacement of 1.92 cu. in. ..... running at a pressure of 1066 ..... only yields 326 in lbs of torque (which is a little over 27 foot lbs, or almost 37 newton-meters, of torque )

    A larger displacement motor will get you more torque (some) at the same pressure .... but that will result in a slower speed, given your flow (gpm)

    I think you really need more flow and pressure to do any substantive work (as in a rear PTO)

  7. #7
    Member
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    JD 455

    Default Re: PTO from hydraulic motor

    Yes that equates to about 3hp.

    I do have a mid PTO which I dont require. It spins at 2000 rpm to run a mower deck. Perhaps a new pump hooked up to that to run a bigger motor. I see surplus centre has PTO motors that require about 20gpm.

  8. #8
    Super Member rswyan's Avatar
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    Kubota B2910, Simplicity 18 CFC, Cub Cadet 782

    Default Re: PTO from hydraulic motor

    Quote Originally Posted by BrisMatt View Post
    Yes that equates to about 3hp.
    Yup

    Quote Originally Posted by BrisMatt View Post
    I do have a mid PTO which I dont require. It spins at 2000 rpm to run a mower deck. Perhaps a new pump hooked up to that to run a bigger motor.
    I'm actually looking at doing that very thing myself - to drive a hydraulic pump to power a hydraulic motor to run a snowblower - see my thread here:

    Convert Rear PTO Snowblower to Front Hydraulic

    Quote Originally Posted by BrisMatt View Post
    I see surplus centre has PTO motors that require about 20gpm.
    It's not that they necessarily require it, it's that they are capable of using it ....

    Think about it this way:

    A particular flow (in GPM) thru a hydraulic motor (under no load) of a particular displacement will determine the speed of rotation.

    When the motor (and as a consequence, the hydraulic pump) encounters resistance, pressure builds - which provides the force/torque/power to accomplish work.

  9. #9
    Member
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    JD 455

    Default Re: PTO from hydraulic motor

    Where can I find a coupling to connect a hydraulic motor to the flywheel of my Yanmar Diesel engine out of my JD 455?
    Thanks
    Matt

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