CLAAS Id77D2h / 77D2h (21) – HYD (A60): Supply voltage is too low

The fault code indicates that the supply voltage is too low. Specifically, this low voltage condition is detected at the electrodistributor module (A105-3), which controls hydraulic valve 3.

• Axion 800 series
• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Axion 870

1. 1

   Analyze interactions by noting all error codes present on the tractor to identify if this code is the root origin of the anomaly.

2. 2

   Check the connectors and the continuity of the harnesses linking the HYD (A60) module to the electrodistributor module (A105-3).

3. 3

   Check the wiring for any short-circuits or open circuits.

4. 4

   Check the sources of energy to the module, specifically inspecting the fuses, the power supply lines, and the ground connections.

5. 5

   Check the component's internal resistance if required.

1. 1

   Inspect the Circuit

   Locate the electrodistributor module (A105-3) on the tractor's hydraulic valve stack. Disconnect the harness and inspect the pins for corrosion, moisture, or damage.

2. 2

   Test Voltage

   Using a multimeter, verify that the module is receiving the correct operating voltage from the HYD (A60) module and that the ground is solid.

3. 3

   Repair Wiring

   If the voltage is low at the connector, trace the harness back to the HYD module and fuse box to repair the damaged wire or replace the blown/corroded fuse.

4. 4

   Replace the Module

   If the wiring, power supply, and ground are all in good condition but the code persists, the electrodistributor module (A105-3) has failed internally and must be replaced.

5. 5

   Clear and Retest

   After repairs are made, clear all error codes from the system. Operate the tractor and actuate the hydraulic valves to ensure the anomaly does not appear again.