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  1. #1
    Elite Member dodge man's Avatar
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    Kubota BX2350

    Default PTO generator speed

    Say you have a PTO generator that is meant for a 540 RPM tractor PTO. Say your tractor is suppose to be 540 rpm at 2600 rpm engine speed. This is more or less wide open or close to it. What happens to the generator output if you run you engine speed at say 2000 rpm. Do you still get 110 volts out of the generator and it will just carry less load?

  2. #2
    Veteran Member jeffinsgf's Avatar
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    Mar 2005
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    Springfield, MO
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    JD 4410

    Default Re: PTO generator speed

    No, that's a truly bad idea. What will change from the lower RPM is the frequency of the power. In other words, everything in your house is designed to work at 110 Volts (or 220 Volts) at a frequency of 60Hz. At a lower RPM you will be producing power at a lower frequency, say 50Hz, which will cause everything to run hot, slow and inefficient.

    My generator has a frequency meter on it. It hits a perfect 60Hz when the tractor tach is right on the little mark for 540 PTO.

    Your tractor was designed to run wide open all day and all night. It ain't a car engine. Don't worry about it. Throttle it up to where it is supposed to be and don't burn up all your appliances.
    4410 ePR, 3rd SCV, Skid Plates, TuffTop Canopy
    430 FEL, 48 BH, MX-5, Bush Hog Chipper, and more.

    455, 60" deck, MC-519, 3pt hitch

  3. #3
    Platinum Member atgreene's Avatar
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    2005 TB135 Excavator with Thumb, Quick Attach System, Ripper tooth, 3' Hydrauic Tilt Clean-up Bucket, Skeleton Bucket, 1986 Kubota 4150 with Loader and Quick Attach with Woods Forks, JD B, 1963 IH 504

    Default Re: PTO generator speed

    I had to add a freq. meter to my pto generator to keep it where it needed to be. The 540 mark on the tach was not accurate. Once I added the meter and could set it where it belonged at 60 hz, the pump, boiler motor etc... were much happier with me. Even the computer would work, through a ups, of course.

    Here's the link to the one I bought. PTO Generator Pricing

    And likewise to what Jeff says, these tracotrs aren't kids toys. Set it where it belongs and let 'er run. Much better for the engine to not be stumbling and playing catch-up with the governor when the well pump or furnace kicks on.

    Good luck.
    1986 Kubota 4150 w QA
    2005 Takeuchi 135 excavator
    2005 GMC 5500 10' Boss V
    1963 Oshkosh 1967
    2013 GMC 3500 6.0 w 9-2 Boss V Fisher poly Sander.
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    Local 740 Portland ME
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  4. #4
    Elite Member RonMar's Avatar
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    May 2005
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    Port Angeles WA
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    Jinma 284 delivered 06/28/05

    Default Re: PTO generator speed

    What Jeff said

    Freq is RPM dependant. A typiucal generator will most likley put out lower voltage if undersped. This is also known as a "Brown Out". Brown out's are VERY bad for electrical and electronic devices. A PTO genny needs to be run within 10% of the PTO RPM of 540 to produce adequate power.
    Ron

  5. #5
    Epic Contributor Soundguy's Avatar
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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: PTO generator speed

    Ditto all that... run the genny at rated rpm.

    Now.. if you had a tractor that had an economy pto setting for small pto loads, and you had enough hp to run at a lower engine rpm, then you could make that work.. but those are alot of "if's"


    soundguy

  6. #6
    Gold Member
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    Jan 2005
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    Western Illinois,just this side of heaven
    Tractor
    Kubota L3400 FEL

    Default Re: PTO generator speed

    dodgeman,
    it appears you may get a chance to test it out with the ice storm moving into western Illinois. Run that tractor to the rated rpm for pto. It will run for days and days with no problems. Tell us how it works if you loose power. I am sitting listening to rain falling on the roof outside and the temperature is 20. I hope we change to snow soon. We have the tractor hooked to the genny and ready to move into action. I hope that is enough insurance to ward off the ice storm. Good Luck
    Jim
    L3400 FEL

  7. #7
    Platinum Member atgreene's Avatar
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    2005 TB135 Excavator with Thumb, Quick Attach System, Ripper tooth, 3' Hydrauic Tilt Clean-up Bucket, Skeleton Bucket, 1986 Kubota 4150 with Loader and Quick Attach with Woods Forks, JD B, 1963 IH 504

    Default Re: PTO generator speed

    If you don't have a hertz meter, find an old clock with a second hand. Plug it into the genny and run it until you find the rpm that runs the clock at exactly 60 seconds per minute. That will work in a pinch.
    1986 Kubota 4150 w QA
    2005 Takeuchi 135 excavator
    2005 GMC 5500 10' Boss V
    1963 Oshkosh 1967
    2013 GMC 3500 6.0 w 9-2 Boss V Fisher poly Sander.
    IH 504, JD B, Ford 2n, Gehl 1475 Round Baler, JD 640 rake, Vermeer 2500 Bale Wrapper, Zetor 185 Drum Mower, New Idea 217 manure Spreader, Kuhn 4 star tedder, Farmi 501 winch.
    Local 740 Portland ME
    20 Scottish Highland Beef Cattle, 3 Herefords, 3 Goats, 2 Alpacas, 2 Llama, 72 chickens, and lots of maple trees.
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  8. #8
    Super Member JB4310's Avatar
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    Feb 2005
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    Central CT
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    J.D. 4310 E-hydro

    Default Re: PTO generator speed

    That's a great tip, only problem who has a plug in clock with a second hand any more?
    Does the 60 HZ have anything to do with 60 seconds in a minute?
    JD 4310; E hydro, 300CX, 48 BH, 60" box, 72" rake, 72" rear blade, cast pallet forks, 48", 61"HD & 73" high volume bucket.
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  9. #9
    Platinum Member atgreene's Avatar
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    Sebago, Maine
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    2005 TB135 Excavator with Thumb, Quick Attach System, Ripper tooth, 3' Hydrauic Tilt Clean-up Bucket, Skeleton Bucket, 1986 Kubota 4150 with Loader and Quick Attach with Woods Forks, JD B, 1963 IH 504

    Default Re: PTO generator speed

    Clock runs on a motor that is geared and calibrated to run on 60 cycle electrical a/c power thus will turn at 1 minute per revolution. Speed up the hz and it will turn faster, slow down the hz (speed of the generator) it will slow down. Kind of archaic way to do it, but it works.
    1986 Kubota 4150 w QA
    2005 Takeuchi 135 excavator
    2005 GMC 5500 10' Boss V
    1963 Oshkosh 1967
    2013 GMC 3500 6.0 w 9-2 Boss V Fisher poly Sander.
    IH 504, JD B, Ford 2n, Gehl 1475 Round Baler, JD 640 rake, Vermeer 2500 Bale Wrapper, Zetor 185 Drum Mower, New Idea 217 manure Spreader, Kuhn 4 star tedder, Farmi 501 winch.
    Local 740 Portland ME
    20 Scottish Highland Beef Cattle, 3 Herefords, 3 Goats, 2 Alpacas, 2 Llama, 72 chickens, and lots of maple trees.
    Facebook: Phillip View Farm

  10. #10
    Platinum Member Tom_Veatch's Avatar
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    Wichita, Kansas
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    Yanmar 2220D

    Default Re: PTO generator speed

    Quote Originally Posted by JB4310 View Post
    ...Does the 60 HZ have anything to do with 60 seconds in a minute?
    HZ or Hertz is the official, scientific term for "Cycles per Second", like "Amperes" or Amps is the term for electrical current ( A bit of useless information: 1 Ampere = 1 Coulomb per Second flowing past a given point. 1 Coulomb = 6.24150962915265 x 10^18 electrons).

    AC (Alternating Current) in the US is standardized at 60 Hz. The voltage alternates from maximum positive to maximum negative and back to maximum positive 60 times per second.
    Tom Veatch
    Wichita, KS
    USA

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