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Discussion Starter #1
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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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.
 

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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
 

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Discussion Starter #5
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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relevant...

 

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