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  1. #1

    Join Date
    Jan 2005
    Posts
    1
    Location
    CA San Joaquin
    Tractor
    Yanmar 187D

    Default CLUTCH PRESSURE PLATE VS INTERNAL CLUTCH PACKS

    I own a Yanmar 187D tractor w/ ~365 hours of run time. When warmed up the clutch appears to slip. I have plenty of freeplay in the clutch pedal. I don't smell anything resembling a slipping clutch. Thinking it may be the internal clutch packs I changed the transmission fluid and filter and cleaned the screen but didn't make a difference.

    Is there a simple method of identifying the problem? Thanks

  2. #2
    Veteran Member
    Join Date
    May 2004
    Posts
    1,288
    Location
    S.E Texas
    Tractor
    Ym1300d-1401D-1601D , 1610D & Massey Ferguson 1020

    Default Re: CLUTCH PRESSURE PLATE VS INTERNAL CLUTCH PACKS

    Mike,

    Excessive free play may indicate a problem if gears tend to grind when shifting. T/O bearing travel is dictated from 1/2" to 3/4" pedal travel to fully engage-disengage clutch disk.

    Any trouble shifting when RPM's over 1000?

    BTW, Welcome to TBN

    Regards, Mark

  3. #3

    Join Date
    Mar 2002
    Posts
    643
    Location
    Near Hagerstown, MD
    Tractor
    Yanmar models: YM1110D, YM1301D

    Default Re: CLUTCH PRESSURE PLATE VS INTERNAL CLUTCH PACKS

    I have a YM1110D with the powershift transmission. Here is how I checked to see if my internal clutches were slipping. Since the regular clutch also engages the pto, I just put the tractor and pto in gear and began driving. Then I pushed the brakes hard enough to stop the tractor from moving, and then checked to see if the pto was turning. It was turning, while the tractor was not moving. That meant that the internal clutches were slipping, not the regular one. But in doing this, the engine lugged down alot, and began to smoke. So I figured that was a heavier load than I was ever going to put on the drivetrain.

    I think you are on the right track. If the internal clutches are slipping, then either the clutches are worn out (I haven't heard of anyone replacing them yet) or they are not getting enough hydraulic pressure. The most common problem is leaking o-rings in the hydraulic shifting mechanism (which is really a fancy hyraulic valve) not allowing enough pressure to the clutches. Hopefully, someone else with more experience can provide some better information.

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