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  1. #1
    Gold Member Ginormous's Avatar
    Join Date
    Apr 2011
    Dayton, Ohio
    Yanmar YM2210

    Default slip clutch vs. overrunning clutch?

    How does a slip clutch differ from an overrunning clutch?
    Yanmar YM2210, Taylor-way 5' finish mower, Woods 4' rotary mower, boom pole, hayride wagon; upgraded tractor with gas turbine engine plus strap on solid rocket motors for that extra boost of speed... but brakes only work when I'm on the ground.

  2. #2
    Veteran Member
    Join Date
    Jun 2010
    Southern California
    International Harvester 284, Yanmar 1401D, Yanmar 240...etc

    Default Re: slip clutch vs. overrunning clutch?

    A slip clutch functions as overload protection, like a shear pin. If too sharp or extreme of a load is placed onto the PTO drive, the clutch slips, protecting the driveline of the tractor and/or implement from spikes in force that may break something. On a tiller, a large rock, log, or other object may get caught in the tines suddenly, and rather than breaking something on the tiller or tractor, the clutch slips.

    An overrun clutch prevents the tractor being propelled forward by power from the implement. Especially with implements that have lots of rotating mass (Mowers, hay rakes, etc) there is a lot of momentum built up in the rotating assembly. Depressing the clutch disconnects the engine from the transmission, but the implement is still fastened directly to the transmission. This means the tractor will be driven forward for quite some distance, with no way for the operator to cut the power to the wheels.

    The overrunning clutch is a one way ratchet that keeps the implement from spinning the tractor's PTO shaft and stops the issue of the implement driving the tractor. It's a serious improvement in safety, as well as usefulness of the machine, too. I universally recommend an overrunning clutch for people whose tractors don't have one internally if they are mowing or doing similar things.

  3. #3
    Super Member kenmac's Avatar
    Join Date
    Feb 2005
    The Heart of Dixie
    Yanmar3110D, Kubota MX 5100 HST, Kubota ZD1021, Kawsaki Mule 4010 trans 4x4

    Default Re: slip clutch vs. overrunning clutch?

    what he said. Use overrun clutch on rotary cutter.. Use slip clutch for tiller
    A Fredricks Yanmar 3110D
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    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  4. #4
    Elite Member Car Doc's Avatar
    Join Date
    Mar 2009
    YM3810D Yanmar

    Default Re: slip clutch vs. overrunning clutch?

    Yup been covered pretty well so far!

    Fwtw obviously a slip clutch is preferable to shear pins in that type applications that require something to "give" you are still in the game.

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