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  1. #1
    New Member
    Join Date
    Apr 2013
    Posts
    2
    Location
    Shelbyville, KY
    Tractor
    JD 2305, JD 6400

    Default JD 6400 Low Transmission/Hydraulic pressure

    Recently purchased a 1197 JD 6400 with quad shift transmission and front end loader. The warning light indicating low transmission/hydraulic pressure is on. Fluid levels are fine. I'm guessing either bad sensor, clogged screen restricting flow, or worst case...bad pump. Looking for help on where to start. I need to get the manuals still so I'm a little in the dark right now. I'm really hoping it is something simple. 3700 hours on the tractor. Any help would be greatly appreciated.
    Thanks,
    Ben

  2. #2
    Super Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    5,237
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: JD 6400 Low Transmission/Hydraulic pressure

    I'd suggest to change hy filter.

  3. #3
    Veteran Member
    Join Date
    Dec 2001
    Posts
    1,027
    Location
    Maryland

    Default Re: JD 6400 Low Transmission/Hydraulic pressure

    TxJim, assuming the filter restriction switch and light are working, the filter is probably OK. The Trans pressure sensors are noted for failing occasionally, especially the original style. It is a good idea to replace the filter first to be sure, but I am betting on a bad sensor. It would be #12 in the diagram. The diagram pictures the new style sensor. The original one looks different. The hex portion for the wrench is the largest part. It will take a 30 mm wrench or socket to remove. The new one takes a 9/16" wrench. It is on the front valve housing of the transmission. If you have mfwd, it is a little more challenging to change because of the driveshaft in the way. -py015011_______un23feb09-gif

  4. #4
    Super Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    5,237
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: JD 6400 Low Transmission/Hydraulic pressure

    jd110
    You're probably correct but I was taught to do the easiest things first and changing the filter is easy compare to other things.

  5. #5
    New Member
    Join Date
    Apr 2013
    Posts
    2
    Location
    Shelbyville, KY
    Tractor
    JD 2305, JD 6400

    Default Re: JD 6400 Low Transmission/Hydraulic pressure

    Thanks for the replies. It was supposedly just serviced with new filters/fluid, but that is a pretty simple thing to change just in case. I'll track down the sensor and try that next.

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