CLAAS 7620h – Claas Tr2 A57 2 Transmission Module: Pressure of high-pressure brakes < 70 bar at initialisation

The pressure of the high-pressure brakes is below 70 bar during initialisation. This is indicated by an audio warning and a steady brake indicator light. The issue may be related to the hydraulic circuit, braking pressure sensor, high pressure braking solenoid valve, or voltage delivered by the transformer.

1. 1

   The hydraulic circuit (valve, pipes, switch…)

2. 2

   Braking pressure sensor (B233)

3. 3

   High pressure braking solenoid valve (Y329)

4. 4

   Voltage delivered by the transformer (V24)

1. 1

   Check the hydraulic circuit

   Inspect the valve, pipes, and switch for any issues that may affect the pressure of the high-pressure brakes.

2. 2

   Test the braking pressure sensor

   Verify the functionality of the braking pressure sensor (B233) to ensure it is providing accurate readings.

3. 3

   Inspect the high pressure braking solenoid valve

   Check the high pressure braking solenoid valve (Y329) for any faults or malfunctions.

4. 4

   Measure the voltage delivered by the transformer

   Confirm that the transformer (V24) is delivering the correct voltage to the system.

5. 5

   Use the specified tool to check the “Auto 5” module

   Use tool number 60 05 033 249 to check the “Auto 5” module and replace it if necessary.