Fendt 18.1.3B – A050 - ECU, basic control unit: Y087 - Steering valve block, Autoguide

The steering valve does not return to its neutral position upon switch-off.

• 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)
• 700 Vario SCR
• Fendt 800 Vario (COM III)
• 820 Vario greentec
• Fendt 900 Vario (COM III)
• 900 Vario SCR
• 922
• 924
• 927
• 930
• 933
• 936
• 939

1. 1

   Check the electrical supply line to the Y087 steering valve for breaks, short circuits, or voltage irregularities (supply voltage should be between 10V and 32V).

2. 2

   Inspect the steering actuator and the position sensor inside the steering valve for mechanical faults or binding that would physically prevent the valve from returning to neutral.

3. 3

   Verify if the steering valve has lost its calibration values in the EEPROM, which can trigger related Y087 fault codes.

1. 1

   Wiring Verification

   Locate the Y087 steering valve block (typically located on the right side of the transmission, accessible by removing the right rear wheel and panel). Inspect the wiring harness and connectors (Separation points X1588 / X1589) for corrosion or broken wires. Repair any damaged wiring.

2. 2

   Actuator/Sensor Testing

   If the wiring is intact, the issue is likely a mechanical fault within the steering actuator or a failed position sensor. Attempt to free any binding in the valve.

3. 3

   Component Replacement

   If the mechanical fault cannot be resolved or the position sensor has failed, replace the steering head or the entire Y087 steering valve block.

4. 4

   System Calibration

   After repairing the wiring, or replacing the steering valve block, you MUST recalibrate the steering system. Enter calibration code '2403' into the tractor's terminal to teach the A050 ECU the new valve's parameters.