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  1. #1
    Member
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    Jul 2011
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    25
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    Chatham, NY
    Tractor
    JD 650

    Default How To Remove PTO Overspin Clutch

    I have a Ford 8N which came with an overspin clutch on the PTO. I've just gotten a JD650 and want to transfer the clutch to the new machine, but can't figure out how to get the clutch off the 8N. I've tried lining up the grease fitting holes with the holes in the clutch, but that doesn't seem to help. I even went to Tractor Supply and read the instructions about how to put one on a shaft. But no help in understanding how to get it off.

    Can anyone explain how to do this?

  2. #2
    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: How To Remove PTO Overspin Clutch

    once you line up the holes then you have to drive the hollow 2"x5/16" roll pin out using a drift.

    sometimes it gets filled with grease and is hard to see.. us a nail or piece of bailing wire to probe with. obviously both fittings must come out on either side to drive the pin out.

    that is assuming you have a pin on and not a quick releasy type that uses a sliding collar that you pull back on, or rotate.. etc.

    soundguy

  3. #3
    Veteran Member
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    Jul 2003
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    Central VA, USA
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    Mahindra 6000 MWFD, 2 1950's Farmalls, 1974 Farmall 140, 1967 Mf 135Delux

    Default Re: How To Remove PTO Overspin Clutch

    Quote Originally Posted by gurumanjohn View Post
    I have a Ford 8N which came with an overspin clutch on the PTO. I've just gotten a JD650 and want to transfer the clutch to the new machine, but can't figure out how to get the clutch off the 8N. I've tried lining up the grease fitting holes with the holes in the clutch, but that doesn't seem to help. I even went to Tractor Supply and read the instructions about how to put one on a shaft. But no help in understanding how to get it off.

    Can anyone explain how to do this?
    I'm pretty sure your JD650 has an independent PTO, which means you don't need the overrunning coupler from 8N...BobG in VA

  4. #4
    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: How To Remove PTO Overspin Clutch

    though it would save his pto brake.. which is why O use an ORC on many independent pto setups.

    soundguy

  5. #5
    Member
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    Chatham, NY
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    JD 650

    Default Re: How To Remove PTO Overspin Clutch

    Thanks Soundguy - You were correct. I punched out the pin with a nail set. Unfortunately, that broke the pin and I had to find a new one. Putting it into the overspin clutch on the JD650 was a real pain because the shroud over the PTO gives you no room with the hammer and I couldn't get the bolts off to remove the shroud. Anyway, I finally got it on -- sort of. I couldn't pound the pin in far enough to get a really good connection with the second grease fitting, but it's on there.

    Bob G. - if the 650 does have an independent PTO it's too late now. I'll never get the **** OS Clutch off without taking half the rear end off.

    Thanks to both of you for your help.

  6. #6
    Platinum Member tessiers's Avatar
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    Sep 2007
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    Central Maine
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    05' JD 790 - 53' Ford NAA - 70' Massey Fergusen 135 diesel - 1967 John Deere 3020 - 1975 Ford 5000 - 1950 John Deere MC - 1992 Thomas T-83 skid steer

    Default Re: How To Remove PTO Overspin Clutch

    I think the PTO shaft on the 8n is 1 1/8 and on the JD 1 3/8, so I don't think the ORC will fit anyway, but otherwise soundguy is right on.
    check us out at www.tessiersfarm.com

  7. #7
    Super Member grsthegreat's Avatar
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    Jan 2011
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    6,634
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    north idaho
    Tractor
    Kioti DK45SE hst cab

    Default Re: How To Remove PTO Overspin Clutch

    The newer overrun clutches dont use pins, they use a slip coller like a normel pto shaft has. Thats what mine has. I HATE those pesky piins
    currently own
    2011 Kioti DK45SE HST CAB tractor/loader, Jimna 6" - 3 point wood chipper, 60" JD Brush Hog, JD 60" Rototiller, 3 point post hole digger with hydraulic assist, 3 point spring tooth rake, Fimco 55 gallon weed sprayer with 12 foot boom, 3 point hydraulic wood splitter (home built)
    Quick Attach 79" loader mount snowblower & rear powerpack
    Quick Attach 84" Snow Blade
    Quick Attach 42" pallet forks

  8. #8
    Super Member AKfish's Avatar
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    Kasilof, Alaska
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    JD 5075M; JD 110 TLB; JD 4720; Ford 9N; JD X300R

    Default Re: How To Remove PTO Overspin Clutch

    Quote Originally Posted by tessiers View Post
    I think the PTO shaft on the 8n is 1 1/8 and on the JD 1 3/8, so I don't think the ORC will fit anyway, but otherwise soundguy is right on.
    You're spot on with the shaft OD's. That's the difference between the "old and the new" standard.

    I replaced the entire pto shaft on my FIL's old 9N to the newer 1 3/8".

    Then I added the over-run clutch... 'cause the pto is not "independent" and I hate it when the rake tries to push me into the trees at the edge of the field!!

    AKfish
    "Most people want to live on top of the mountain, but all the happiness and growth occurs while you're climbing it."

  9. #9
    Platinum Member tessiers's Avatar
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    Central Maine
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    05' JD 790 - 53' Ford NAA - 70' Massey Fergusen 135 diesel - 1967 John Deere 3020 - 1975 Ford 5000 - 1950 John Deere MC - 1992 Thomas T-83 skid steer

    Default Re: How To Remove PTO Overspin Clutch

    I like the ORC and would not run my ford without it, a new one with the right shaft size is only about $50
    check us out at www.tessiersfarm.com

  10. #10
    Member
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    Jul 2011
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    Location
    Chatham, NY
    Tractor
    JD 650

    Default Re: How To Remove PTO Overspin Clutch

    Well, now you guys have gotten me completely confused, because the OD clutch fit on the JD PTO just fine. I've had the 8N (1952 serial number) so long I'd forgotten whether the tractor dealer changed the PTO shaft to the "new" standard. However, I found a PTO shaft in the old tool box that must have been the "old" one. Anyway, the OD fit the JD650 just fine and it has the "old" style pin that is, for now at least, a "permanent" fixture on the JD.

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