Fendt 0A.1.F5 – Basic Control Unit (ECU A050) / Central Hydraulic Control Module: Y022 - Lower solenoid valve, (front power lift)

The system has detected an electrical fault: a short circuit to earth, a short circuit to +UB (battery voltage), or a break in the wiring. As a result, the front power lift will be locked out, and no lowering will be possible.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt Farmer 400
• Fendt Favorit 700 / 900
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III and S4 generations)

1. 1

   Locate the Y022 Lower solenoid valve on the front hydraulic block.

2. 2

   Inspect connector X333 (the separation point for the Y022 valve) for corrosion, pushed-out pins, or moisture ingress.

3. 3

   Test the wiring harness between connector X333 and the ECU using a multimeter. Check for continuity, shorts to ground (Earth pin 22), or shorts to battery voltage (+UB).

4. 4

   Measure the internal resistance of the Y022 solenoid coil to check for an open circuit or dead short.

1. 1

   Turn off the ignition and disconnect the tractor's battery to prevent electrical spikes.

2. 2

   Disconnect connector X333 from the Y022 solenoid valve.

3. 3

   If the diagnostic checks revealed damaged wiring, repair the harness break or replace the damaged connector pigtail.

4. 4

   If the wiring is intact but the solenoid failed the resistance test, remove the retaining nut/fastener securing the Y022 solenoid coil to the hydraulic valve cartridge.

5. 5

   Slide the old solenoid coil off the valve stem.

   Note: If the mechanical valve spool is seized, you may need to replace the entire cartridge valve rather than just the electrical coil.

6. 6

   Install the new solenoid valve/coil and secure the retaining nut.

7. 7

   Reconnect connector X333.

8. 8

   Reconnect the battery, turn on the ignition, and clear the fault codes via the Vario terminal.

9. 9

   Test the front power lift to confirm the lowering function has been restored.