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  1. #1
    Platinum Member TNhobbyfarmer's Avatar
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    Dec 2004
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    776
    Location
    Middle Tennessee
    Tractor
    Kubota 3430 4WD

    Default MInimum engagement of driveline tubes?????

    A year or so ago I added Pat's easy change to my lower hitch arms. That added an extra 4 inches distance from the rotary cutter to the PTO spline. I have been using the cutter ever since without incident. However, I got to thinking about how much engagement I now had in the metal driveline tubes so I measured. Only 5.5 inches. Is that problematic? I have put many hrs on the cutter since the change. Should I worry?
    Jerry
    Kubota L3430 with FEL

  2. #2
    Super Member RickB's Avatar
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    Sep 2000
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    7,527
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: MInimum engagement of driveline tubes?????

    Usual published specification is 6". You be the judge.
    We have too much gun control.
    What we need is more idiot control.

  3. #3
    Elite Member
    Join Date
    Jan 2010
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    2,612
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: MInimum engagement of driveline tubes?????

    How much does this change when you go over ridges or through ravines, etc. If you have put on many hours with no problems and the shaft still telescopes smoothly it sounds like you are still okay.

    So much depends on the torque being transmitted, any shock loading, etc. that it is very difficult to say what is the minimum engagement required.

    Example: How many MMM have 6" of engagement when tehy are in operation? I have never measured this on branson but I am estimating maybe 4" engagement when at cutting height.
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  4. #4
    Super Member
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    Feb 2006
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    8,605
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    VA
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    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: MInimum engagement of driveline tubes?????

    Quote Originally Posted by TNhobbyfarmer View Post
    A year or so ago I added Pat's easy change to my lower hitch arms. That added an extra 4 inches distance from the rotary cutter to the PTO spline. I have been using the cutter ever since without incident. However, I got to thinking about how much engagement I now had in the metal driveline tubes so I measured. Only 5.5 inches. Is that problematic? I have put many hrs on the cutter since the change. Should I worry?
    Quote Originally Posted by RickB View Post
    Usual published specification is 6". You be the judge.
    If that is the minimum engagement you have [varies with lift] and your tubes fit well so there is little side slop you will be ok til they wear enuf that appreciable side slop develops. ... Thats if you have the trochoidal tubes. If theyre solid square in square receptacle significant sideslop can be accomodated because the interlock is much more rigid and wont deform and bind as readily.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  5. #5
    Super Member greg_g's Avatar
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    Dec 2003
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    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: MInimum engagement of driveline tubes?????

    I don't feel comfortable with a mere 6" overlap, that's a worst case scenario in my book. When at max installed extension, I like to have as close to 1/3 extension as possible. Take a 42" shaft (collapsed) for example; it can safely operate at lengths between 43" and 60" and still maintain a nice safe 12" minimum overlap. It helps extend the lifespan of PTO shafts too. As was touched upon above, wobble increases as overlap decreases. The more overlap you can safely operate with, the longer your PTO shafts will last.

    Regarding PEC + aftermarket extension device , I used both for hundreds of hours on two different tractors with nary an issue.

    //greg//
    Last edited by greg_g; 05-09-2013 at 08:05 AM.
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  6. #6
    Platinum Member Henri88's Avatar
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    Nov 2009
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    725
    Location
    Northern N.B.
    Tractor
    2008 JD 2305

    Default Re: MInimum engagement of driveline tubes?????

    I've ran into the same situation you did a few years back. Bought my tractor and tiller new, cut the pto shaft at the right length and then a year later I bought a quick hitch. Now the shaft was only overlapping about 5 or 6'' and did not felt comfortable with that so I fix my problem with an extension. Problem solved and feel much better.

    -dscf6416-jpg -dscf6417-jpg

    Henri
    Henri

    How could you be told I was french?

    Rotary cutter 4' Howse , mid mount mower 54'' , f.e. loader 200CX , tiller RT1150 Frontier , cultivator PC1001 Frontier , middle buster PM1001 Frontier , JD 47'' front snowblower , pallet forks , 4' boxblade Agriease , grass-sweeper , quick hitch Speeco , trailer hitch , cab Jodale-Perry , trailer 16' galvanized Easy-Hauler ,

  7. #7
    Advertiser sweettractors's Avatar
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    Jul 2003
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    7,188
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    Central Kentucky
    Tractor
    JD 6403 CHA-JD 3130 CHA

    Default Re: MInimum engagement of driveline tubes?????

    I don't like extensions, as the wobble puts excessive wear on all bearings and seals in the entire drive system. May be ok for limited use, however, sooner or later they will catch up to you. Ken Sweet
    http://www.sweetfarms.com/

    Sweet Farm Equipment LLC (Internet Sales, Shipping All States)
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  8. #8
    Super Member RickB's Avatar
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    Eastern NY
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    Case 885, Ford 4000

    Default Re: MInimum engagement of driveline tubes?????

    Quote Originally Posted by sweettractors View Post
    I don't like extensions, as the wobble puts excessive wear on all bearings and seals in the entire drive system. May be ok for limited use, however, sooner or later they will catch up to you. Ken Sweet
    Couldn't agree more. Extensions also foul up the standardized dimensions between the end of the tractor PTO shaft and drawpin when using drawn implements rather than the more common (here) 3PT implements.
    We have too much gun control.
    What we need is more idiot control.

  9. #9
    Super Star Member k0ua's Avatar
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    Jun 2009
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    15,482
    Location
    Branson, Mo.
    Tractor
    Kioti DK35se Hydrostat

    Default Re: MInimum engagement of driveline tubes?????

    I can tell you what I did, and you can do what you like. I was faced with the same problem. Rotary cutter was originally on kubota B7500.. Was cut for that tractor.. worked fine, then I swapped that tractor for an L3400hst.. it worked but it was short, maybe 6 inches or so.. Then swapped for a slightly larger tractor my current Kioti Dk35se.. Now it is really bad, maybe 5 inches, Maybe..I looked at the extensions.. decided I did not like the wobble factor... I bought another longer PTO shaft..It was over $100, but hey I just bit the bullet, now I feel better. I have seen the 1/3 rule overlap in print.. I have also seen a couple of trashed PTO shafts on here from being too short. It can and does happen.

    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


  10. #10
    Super Member
    Join Date
    Feb 2006
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    VA
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    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: MInimum engagement of driveline tubes?????

    Quote Originally Posted by greg_g View Post
    I don't feel comfortable with a mere 6" overlap, that's a worst case scenario in my book. When at max installed extension, I like to have as close to 1/3 extension as possible. Take a 42" shaft (collapsed) for example; it can safely operate at lengths between 43" and 60" and still maintain a nice safe 12" minimum overlap. It helps extend the lifespan of PTO shafts too. As was touched upon above, wobble increases as overlap decreases. The more overlap you can safely operate with, the longer your PTO shafts will last.

    //greg//
    This is true with the trochoidal shafts. ... the whole overlapped length effectively interlocks giving added stability with increased engagement. The rectangular shafts are, or are often constructed differently. ... On mine the square receptacle is just 5" long and welded to the end of a piece of round tubing. The solid rectangular portion slips inside, but regardless of insertion, only bears on the 5" long female. -- So, beyond about 5.25" insertion you have full bearing rigidity and are free of end effects. They are quite durable according to their 40 yr history on bushogs that I beat the crap out of.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

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