JD 6400 No Power Steering, But SCV, 3 point and loader work?
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Thread: JD 6400 No Power Steering, But SCV, 3 point and loader work?

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    JD 6400 No Power Steering, But SCV, 3 point and loader work?

    We are working on a JD 6400. The PS does not work. Priority valve and Steering motor have been switched out but still no PS.
    The 3 point, SCV and Loader work.

    Any Ideas?

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    The Hydraulic pump never see's a load when using the power steering and strokes the pump.

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    Zebrafive's Avatar
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    I would be looking at the priority valve (mounted a the rear). Filter key 7 might be clogged. Key 6 adjusts steering pressure, 1/4 turn = 250psi.. There is are test ports on the back to check pressures, one is steering. Top right IIRCC. Should be between 145-218psi at 1500rpm, steering not turned, at lock 2540-2730psi.
    Attached Thumbnails Attached Thumbnails 6400priorityvalve.jpg  
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    Zebrafive's Avatar
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    Quote Originally Posted by Lucky60 View Post
    The Hydraulic pump never see's a load when using the power steering and strokes the pump.

    Could be a problem in the load sense lines or a missing LS disc between SCVs. Key 3 is the disc
    Attached Thumbnails Attached Thumbnails 200scv3disc.jpg  
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    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader
    John Deere 285 50" deck Stolen May 2017
    John Deere x485 62" deck AWS
    Kawasaki Mule 2510 4x4 bought new 1996
    Ford F250 4x4 bought new 1978

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    Thanks, will check next week, we exchange the priority valve with a other used unit. That did not help. It may have had a problem. Then we did the steering valve motor. Still no luck!

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    johnH123's Avatar
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    relevant...

    Attached Thumbnails Attached Thumbnails Screenshot (95).png  
    - 2002 John Deere 4510 TLB PR,
    -Woods BB60X 60" rotary cutter
    -Countyline box blade,
    -Allis Chalmers sickle mower,
    -RED windrow rake,
    -titan 48" 3000 pound forks/bale spear
    - Farm Star rear bale spear

    Yamaha Rhino 700, Yamaha Rhino 660,
    Murray 624 mower/38" deck

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    That was me talking with Warren thru Youtube
    johnH123 likes this.

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    johnH123's Avatar
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    Quote Originally Posted by Lucky60 View Post
    That was me talking with Warren thru Youtube
    Thought so. I posted it here so others could see.
    - 2002 John Deere 4510 TLB PR,
    -Woods BB60X 60" rotary cutter
    -Countyline box blade,
    -Allis Chalmers sickle mower,
    -RED windrow rake,
    -titan 48" 3000 pound forks/bale spear
    - Farm Star rear bale spear

    Yamaha Rhino 700, Yamaha Rhino 660,
    Murray 624 mower/38" deck

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