CLAAS Id77E0h / 77E0h (11) – HYD (A60): "Instruction" message of valve 4 is not received or is improbable

The "Instruction" message of valve 4 is not received or is improbable. As a safety measure, electrodistributor 4 (Valve 4) is forced to return to the neutral position.

• Axion 800 series
• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850

1. 1

   Check the communication lines for the hydraulic CAN bus network

2. 2

   Check the connectors and continuity of the harnesses linking the HYD (A60) module to the electrodistributor module (A105-4)

3. 3

   Test for any short-circuits or open circuits in the wiring

4. 4

   Check the sources of energy, including fuses, power supply voltage, and ground connections to the valve

5. 5

   Check the electrodistributor's operating conditions (e.g., mechanical seizing, pressure, temperature)

1. 1

   Document Codes

   Note all error codes present on the tractor, as CAN bus errors can sometimes cascade and generate secondary codes.

2. 2

   Inspect Connections

   Locate the electrodistributor module (A105-4) for Valve 4. Disconnect the harness and inspect the pins for corrosion, moisture, or pushed-out terminals. Reconnect securely.

3. 3

   Test the CAN Bus

   Using a multimeter or oscilloscope, verify the integrity of the Hydraulic CAN bus network between the HYD (A60) module and the A105-4 valve module.

4. 4

   Verify Power/Ground

   Ensure the valve is receiving proper operating voltage and has a clean ground.

5. 5

   Replace/Swap Component

   If the wiring, power, and CAN signals are intact but the "Instruction" message is still not being received, the electrodistributor module (A105-4) itself has likely failed internally and must be replaced.

6. 6

   Clear and Retest

   Clear all error codes from the system, restart the tractor, and operate the hydraulic remote for Valve 4 to ensure the anomaly does not return.