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  1. #1
    Veteran Member lhfarm's Avatar
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    May 2002
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    1,223
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    Central Indiana
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    NH TC40DA

    Default Was removing, now installing PTO shaft ??s

    Got the shaft off a very old (at least 35 years) 5' Bush Hog brand mower. The tractor end of the shaft was set up for a 1 1/8" spline and I need a 1 3/8 quick coupler. The mower end was keyed and had a bolt through the shaft too. Purchased a King Kutter replacement shaft - I matched the length and shaft sizes at TSC. The fit is perfect, except the shear bolt size. The new shaft has a 1/2" hole and the mower is 5/16".

    Should I drill out the mower shaft (not going to be easy) or try to find a matching end (small shear bolt hole)?

    Should I add a slip clutch (torque limiter?) between the mower shaft and the drive line?

    Any suggestions appreciated.

  2. #2
    Veteran Member Slamfire's Avatar
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    Mar 2002
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    Coker Creek, TN
    Tractor
    Mitsubishi D 1800

    Default Re: Was removing, now installing PTO shaft ??s

    Oh, wow! A 1 3/8 to 1 1/8 adaptor would have set you back less than $10. [img]/forums/images/graemlins/shocked.gif[/img]

  3. #3
    Veteran Member lhfarm's Avatar
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    May 2002
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    Central Indiana
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    NH TC40DA

    Default Re: Was removing, now installing PTO shaft ??s

    </font><font color="blue" class="small">( Oh, wow! A 1 3/8 to 1 1/8 adaptor would have set you back less than $10. [img]/forums/images/graemlins/shocked.gif[/img] )</font>
    Before I got the new tractor, that was what I was using. It had a pin hole for locking onto the PTO shaft. My new tractor doesn't have the hole. So I tried to find a quick connect 1 3/8 to 1 1/8 adaptor, but no luck. So I had one welded up. Last weekend, a buddy was helping me mow and engaged the PTO with the engine at 540 RPM and snapped the 1 1/8 spline where it went into the old driveline. Scared the &amp;&amp;&amp;^^ out of me. For safety, I thought I should get the correct style shaft.


  4. #4
    Silver Member
    Join Date
    Jul 2004
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    165
    Location
    Mid TN, USA
    Tractor
    175 Allis, 1975

    Default Re: Was removing, now installing PTO shaft ??s

    <font color="blue"> Should I drill out the mower shaft (not going to be easy) or try to find a matching end (small shear bolt hole)?
    </font>

    Barry,
    Do you have sufficient length to cut the end off and drill the hole size you want in the shaft? I wouldn't concern myself with a slip clutch with a 5/16" shear bolt. It should shear before damaging something else.

    TK

  5. #5
    Bronze Member
    Join Date
    Feb 2004
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    91
    Location
    Central Florida
    Tractor
    Yanmar YM1510D

    Default Re: Was removing, now installing PTO shaft ??s

    I run our brush deck with an Over-Running Clutch. This is in addition to the shear bolt at the implement end of the PTO shaft. The clutch lets the deck free-wheel when the tractor stops - preventing the momentum of the blades transfering back into the tractor and continuing to push it forward.

    cvt

  6. #6
    Veteran Member lhfarm's Avatar
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    May 2002
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    Central Indiana
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    NH TC40DA

    Default Re: Was removing, now installing PTO shaft ??s

    I am using bronze bearings to reduce the 1/2" to 5/16" and that seems to be working ok. I figure the smaller size is just another safety factor.
    Thanks for all the replies.

  7. #7
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    Central florida
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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: Was removing, now installing PTO shaft ??s

    I would either bushing down the 1/2 holes in the yoke to 5/16 and use the 5/16 bolt, or I would take the pto yoke, turn it 90 degrees and drill a 5/16 hole thru it.. make sure it is square.. use a drill press or let the machine shop do it.. might set you back 10$ if you walk in at lunch time, cause it will take the guy less time to chuck up a mill than to make out the 'paperwork'.. etc.

    soundguy

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