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  1. #1
    Member
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    Nov 2011
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    35
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    Harrisburg, PA
    Tractor
    John Deere 855

    Default Properly sizing PTO shaft

    Being a tractor newbie, I've never worked with implements that were PTO driven. Reading several threads recently about damage to PTO's, shafts, and implements due to improper sizing, I have a basic question for the board. How do you properly size a PTO shaft? As an example, if I was renting an attachment for my 855, how would I know I could use it without breaking something, assuming of course it was of a width and weight the tractor could handle. (I know I need to stick to stuff that is on the smaller side.)

  2. #2
    Elite Member
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    Dec 2007
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    3,023
    Location
    texas
    Tractor
    7040 HDC 1153 fel

    Default Re: Properly sizing PTO shaft

    Quote Originally Posted by laurelrun View Post
    Being a tractor newbie, I've never worked with implements that were PTO driven. Reading several threads recently about damage to PTO's, shafts, and implements due to improper sizing, I have a basic question for the board. How do you properly size a PTO shaft? As an example, if I was renting an attachment for my 855, how would I know I could use it without breaking something, assuming of course it was of a width and weight the tractor could handle. (I know I need to stick to stuff that is on the smaller side.)
    i think they are talking about messing the tractors pto up not the equipment its running.

  3. #3
    Elite Member JasG's Avatar
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    Jan 2004
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    3,163
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    CNY
    Tractor
    Kubota L3240

    Default Re: Properly sizing PTO shaft

    PTO driven equipment ussually has an min and max hp rating. You need to find out what those are and you and your tractor should be fine.

  4. #4
    Elite Member Zebrafive's Avatar
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    Aug 2010
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    2,897
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    South West MI
    Tractor
    John Deere 2030, John Deere 6415

    Default Re: Properly sizing PTO shaft

    The PTO shaft must be short enough to still have travel so it will not bottom out in the shortest position it will be in. This is normally when the PTO shaft is level. Mount the implement, but don't hook up the PTO shaft, raise until the shaft would be level, then see if the PTO shaft will collapse enough to install.
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  5. #5
    Veteran Member yelbike's Avatar
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    Nov 2011
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    Near Winnipeg, Mb, Canada
    Tractor
    John Deere 2305, 2320,Z465

    Default

    Zebrafive has it right except for the level part. Different tractors have different lifting arcs at the three point hitch. Just look where the shaft would be the shortest point, if would you can't install or uninstall the pto shaft the its too long.
    Don't take a chance with a long pto shaft!!! Been there done that, 10 k in damage to my tractor.
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  6. #6
    Member
    Join Date
    Nov 2011
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    35
    Location
    Harrisburg, PA
    Tractor
    John Deere 855

    Default Re: Properly sizing PTO shaft

    OK, so the dangers lie in using something your tractor just can't power and in using something with a shaft that's too long for the linkage. Thanks guys!

  7. #7
    Bronze Member PHIL850's Avatar
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    Apr 2006
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    99
    Location
    MASS and Northeast kingdom of VT
    Tractor
    JD 850

    Default Re: Properly sizing PTO shaft

    Be sure your Drive shaft is sized for the equipment you are running. Don't use a drive shaft designed to run a spreader on a 5' Brush hog or it might end up looking like the picture attached.
    Attached Thumbnails Attached Thumbnails -vtmower-011-jpg  

  8. #8
    Super Member flusher's Avatar
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    Jun 2005
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    6,354
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    Northern California-Tehama Co.
    Tractor
    2008 Mahindra 5525, 1964 MF-135 diesel, 1951 Farmall Super A, 1951 Minneapolis Moline BF, 1945 Oliver 60 Row Crop, 1949 JD B widefront

    Default Re: Properly sizing PTO shaft

    Quote Originally Posted by PHIL850 View Post
    Be sure your Drive shaft is sized for the equipment you are running. Don't use a drive shaft designed to run a spreader on a 5' Brush hog or it might end up looking like the picture attached.
    My neighbor did that number on the pto shaft inside his Ford 8N when he tried to operate an IH hay baler (small squares) without an overrunning clutch on the pto drive shaft.

  9. #9
    Platinum Member Dead Horse's Avatar
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    Feb 2009
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    Location
    New Hampshire

    Default Re: Properly sizing PTO shaft

    Quote Originally Posted by yelbike View Post
    Zebrafive has it right except for the level part. Different tractors have different lifting arcs at the three point hitch. Just look where the shaft would be the shortest point, if would you can't install or uninstall the pto shaft the its too long.
    Don't take a chance with a long pto shaft!!! Been there done that, 10 k in damage to my tractor.
    If you do rent an implement and the shaft is cut just a tad too long, you may be able to make it work by adjusting the top link. Also, many implements have multiple holes/pin points for the lower link connections. Checking all this "fit" out is very important as you can do significant damage to the implement, PTO shaft or worse, your tractor, with too long a PTO shaft installed!

    Best practice is to hook up and carefully check the fitment through the full range of motion of the lift.
    "We a two tractor family"

  10. #10
    Super Star Member k0ua's Avatar
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    Jun 2009
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    Branson, Mo.
    Tractor
    Kioti DK35se Hydrostat

    Default Re: Properly sizing PTO shaft

    And if the PTO shaft is too short it can break and come apart, and if you can imagine the part that is hooked to the tractor flying around at 540 RPM in a big arc beating the he** out of anything within reach. And the other part will fly around for quite a while too. I imagine it could get pretty "sporty" back there for a while.

    James K0UA
    James KUA

    Kioti DK35se hydrostat with 2 QA buckets, 48 inch. King Kutter Rotary Cutter. 750 lbs ballast box. Loaded tires, Construction Attachments SSQA Lightweight Pallet forks. EA 50 inch single lid "wicked" Grapple. Satisfied Everlast PA160 welder owner How to add a link to a post . Best way to search TBN


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