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  1. #1
    New Member
    Join Date
    Oct 2012
    Posts
    2
    Location
    Corbett, OR
    Tractor
    Ford 681 SOS

    Default Ford 681 Select-O-Speed Questions

    I recently purchased a 681 SOS (year=1960). Am rebuilding the engine and the transmission looks good. I have the necessary manuals (even got the owner's manual) but still have a couple of questions.

    1)There is a lever on the left side and just forward of the seat (lower on the transmission casting) marked on and off. Anyone know what it turns on or off?

    2) The pull handle on the dash...I'm assuming that if I pull it out I disengage the PTO and with it in the PTO runs...right? (if I'm wrong...what does it do?) I originally thought this was to shift it to the higher PTO speed, but I found another lever on the transmission housing that I think (maybe) does that.

    Many thanks for your input.

  2. #2
    Gold Member jones6780's Avatar
    Join Date
    Nov 2008
    Posts
    298
    Location
    Lizella, Ga.
    Tractor
    1700 4wheel drive, Yazoo/Kees Max2 Zero Turn

    Default Re: Ford 681 Select-O-Speed Questions

    I haven't seen a select-o-speed in in over 25 years but I would guess the the lever is the PTO and the pull handle is fuel cut off if it is diesel.
    That is just a guess.

  3. #3
    New Member
    Join Date
    Oct 2012
    Posts
    2
    Location
    Corbett, OR
    Tractor
    Ford 681 SOS

    Default Re: Ford 681 Select-O-Speed Questions

    Thanks for the input....I've learned through a couple of others that the handle in question activates the PTO. Pull it out to turn it on, push it in to turn it off. The lever toward the rear is for the "ground speed" PTO mode, which is driven off the output shaft of the transmission and therefore varies its speed based on how fast the rear wheels are turning. BTW....mine is a gas model. Still learning a lot about this thing. As I'm having to rebuild the engine, I suspect I'll learn as I go. Thanks again.

  4. #4
    Super Member
    Join Date
    Dec 2007
    Posts
    5,338
    Location
    Ohio
    Tractor
    JD 5520, 790 TLB-- Kub L4300, B7800, MX5100

    Default Re: Ford 681 Select-O-Speed Questions

    Send a message to soundguy if he doesn't answer first. He's the go-to guy on these things and is very knowlegable..
    ******

    May I be the kind of person my dogs think I am,

  5. #5
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,658
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Ford 681 Select-O-Speed Questions

    Ground speed PTO? That opens up the possibility of a driving axle under a trailer. It might make a great hauler for extreme mud, or extreme grades.

    I didn't know any US tractors had this.

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,040
    Location
    Central florida
    Tractor
    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: Ford 681 Select-O-Speed Questions

    yum.. an sos.. I need to get a rowcrop sos one day.

    sounds like good answers already..

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