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  1. #1
    Veteran Member
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    Jan 2002
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    1,569
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    Colorado
    Tractor
    2000 New Holland TC29D with 7308 FEL, and top & tilt. 1950 John Deere B. 1940 Farmall A.

    Default hole in the PTO shaft

    There is a hole in the PTO shaft on my NH TC29D. Do all tractors have this hole? What is it for? Iím guessing it could be used on some implements instead of a spring loaded lock pin on the outside of the yoke to keep the PTO shaft in place.

  2. #2
    Super Star Member
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    Aug 2001
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    11,496
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    Upper Midwest USA
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    JD 4300, JD X485 JD 4x2 Gator, JD 425, JD455

    Default Re: hole in the PTO shaft

    You are right, as 'in the old days' (when we walked to school, etc, etc, ) we used a bolt to hold the pto shaft together. No fancy slip lock or spring loaded pin such as nowadays. Probably still there to adapt to some of the older attachments.

  3. #3
    Silver Member
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    Mar 2002
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    148
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    Nebraska
    Tractor
    Iseki TA 210

    Default Re: hole in the PTO shaft

    It is used to hold PTO attachments.... For example an overrunning clutch would use the hole as it would have a pin that would slide through the PTO shaft. You then have zirc fittings that allow you to grease the pin....

  4. #4
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    frank_f15's Avatar
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    BUFFALO ,NEW YORK AREA
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    kubota b2400- R4 tires

    Default Re: hole in the PTO shaft

    some of the old tractors had such a hole it was to keep the pto shft on the pto. a small bolt went though it . was no spring loaded pins back then

  5. #5
    Epic Contributor jinman's Avatar
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    Feb 2001
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    20,948
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: hole in the PTO shaft

    Mosey, on many PTO adapters, a spring-loaded pin fits into the groove cut into the spline teeth on your PTO shaft. The hole is for an additonal safety pin much like the one on a bulldog style trailer hitch. Then if you get vines wrapped around your PTO shaft and they happen to squeeze and release the spring-loaded pin, the safety pin keeps the PTO shaft and adapter locked together. It is true that this hole is used for the rollpin of an overrun clutch, but the PTO spline on the overrun clutch also has a hole in it just like the one on the tractor. I hope this helps.

  6. #6
    Veteran Member
    Join Date
    Jan 2002
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    Location
    Colorado
    Tractor
    2000 New Holland TC29D with 7308 FEL, and top & tilt. 1950 John Deere B. 1940 Farmall A.

    Default Re: hole in the PTO shaft

    OK, that all makes sense. Thanks!

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