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John Deere 650K hydraulic pressure loss

Dalton Z · 2025-02-14 21:29

I am working on a 650K vin 1T0650KXEFF290163 that suddenly lost hydraulic pressure . No codes present. Dash shows 200 psi at rpm. Tested pump and it tests 2,000 psi and 22 gpm. What regulates the high pressure in the system? No visible damage to the pressure relief valve on inlet of main control valve. It does have a new pilot pressure regulator valve. Thanks

Replies5
  1. #1mg23612025-02-15 05:58

    No codes popping up, or no codes when going into the code section of the menu? EH machine? System relief valve is on the bottom of the inlet section, next to the hydraulic pressure sensor.

  2. #2Dalton Z2025-02-17 08:06

    No codes…what do you mean by EH machine?

  3. #3Simon C2025-02-17 10:22

    Is it an Electro-Hydraulic Machine, not oil to the joysticks controls. That is what he means from my experience. Maybe manufactured with both systems, one as an option.? Simon C

  4. #4Dalton Z2025-02-17 10:33

    Ok yes it’s electric over hydraulic….

  5. #5Dalton Z2025-02-19 18:36

    We found the issue. There is a check valve where the charge line comes up from the hydrostatic pump in the return block of the main control valve that had some debris in it so was not allowing the pilot pressure to build.