Fendt 08.1.F6 – A050 ECU (Basic Control Unit): Y077 - EHR cut-off valve, rear: Final stage error (pilot control solenoid valve) / Output stage error.

This indicates an electrical failure in the output stage of the pilot control solenoid for the rear Electronic Hitch Control (EHR) cut-off valve. As a safety consequence, the system forces the valve to move to neutral and lock, which disables the rear power lift/hitch.

• 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 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 919 Vario (COM III)
• Fendt 922 Vario (COM III)
• Fendt 924 Vario (COM III)
• Fendt 927 Vario (COM III)
• Fendt 930 Vario (COM III)
• Fendt 933 Vario (COM III)
• Fendt 936 Vario (COM III)

1. 1

   Visually inspect the Y077 valve on the rear valve block, checking the wiring harness and connector for corrosion, broken wires, or loose pins.

2. 2

   Use a multimeter to check the electrical circuit between the A050 ECU and the Y077 valve for open circuits or shorts to ground/power.

3. 3

   Measure the resistance across the pins of the Y077 pilot control solenoid to determine if it has failed internally (shorted or open coil).

4. 4

   Verify that the valve actuator is not mechanically jammed, which can overwork the solenoid and lead to an output stage error.

1. 1

   Preparation

   Safely park the tractor on level ground. Lower any attached rear implements completely to the ground to relieve hydraulic pressure in the rear power lift system. Turn off the engine and remove the key.

2. 2

   Locate the Valve

   Access the rear valve block at the back of the tractor. Identify the Y077 EHR cut-off valve.

3. 3

   Disconnect Electricals

   Carefully unplug the electrical harness connector from the Y077 solenoid.

4. 4

   Clean the Area

   Thoroughly clean the area around the valve block to ensure no dirt or debris enters the hydraulic system during removal.

5. 5

   Removal

   Unbolt and remove the rear EHR valve assembly (as per manual procedure 'Removing the rear EHR valve'). Have a catch pan ready for residual hydraulic fluid.

6. 6

   Installation

   Install the replacement Y077 valve/solenoid and torque the mounting bolts to OEM specifications (procedure 'Installing the rear EHR valve').

7. 7

   Reconnection

   Reconnect the electrical harness to the new valve.

8. 8

   Calibration & Testing

   Start the tractor. Use the dashboard terminal or the SERDIA diagnostic software to clear the stored 08.1.F6 fault code. Test the rear power lift through its full range of motion to ensure proper operation and check for hydraulic leaks.