CLAAS Id77C5h / 77C5h (41) – HYD (A60): The power supply of valve 2 is too high (> 42 V)

As a safety measure, the system forces electrodistributor 2 to return to the neutral position, rendering that specific hydraulic circuit inactive.

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

1. 1

   Check the connectors and the continuity of the harnesses linking the HYD (A60) module to the A105-2 electrodistributor.

2. 2

   Check for any short-circuits (especially to a higher voltage source) or open circuits in the wiring.

3. 3

   Check the sources of energy, including fuses, power supply lines, and grounds.

4. 4

   Check the internal resistance of the A105-2 component.

1. 1

   Verify the Code

   Note the error codes present on the CEBIS panel or via the METADIAG diagnostic tool to confirm Id77C5h is the primary fault.

2. 2

   Inspect Wiring

   Physically inspect the wiring harness leading to hydraulic valve 2 (A105-2) at the rear hydraulic block. Look for chafed wires, pinched harnesses, or water ingress in the connector.

3. 3

   Test Voltage

   Disconnect the A105-2 valve and test the supply voltage at the harness side with a multimeter.

4. 4

   Clean and Reseat

   If the voltage is normal (approx. 12V), clean the connector pins with contact cleaner, apply dielectric grease, and reconnect.

5. 5

   Replace the Valve

   If the wiring is intact and the supply voltage is correct, the internal driver/sensor of the electrodistributor module is faulty and the valve head must be replaced.

6. 6

   Clear and Retest

   Clear all error codes from the HYD module and operate the tractor's hydraulic valve 2 to ensure the anomaly does not return.