CLAAS Id75CBh / 75CBh (312) – TR1 (A57-1): Insufficient current sent to the reverse gear solenoid valve

The current sent to the reverse gear solenoid valve is insufficient, flagged as a 'current regulation problem'. When this fault occurs, the machine will trigger an audio warning and request an 'ISC' reset.

• CLAAS Axion 800 Series (e.g., Axion 850, 810)
• CLAAS Arion 500/600 Series (e.g., Arion 640-510, 630-610)

1. 1

   Verify that the system is receiving adequate battery voltage.

2. 2

   Check for a possible resistance on the solenoid valve power supply harness.

3. 3

   Verify the connectors and continuity of the harnesses linking the TR1 module to the solenoid, checking for short-circuits to ground or open circuits.

4. 4

   Directly inspect the reverse gear solenoid valve SV3 (Y335-3) and verify its internal resistance.

5. 5

   Ensure the component's operating conditions are normal and check for mechanical seizing of the valve.

1. 1

   Test Power Source

   Measure the battery voltage to rule out a baseline voltage supply issue.

2. 2

   Inspect the Harness

   Trace the wiring from the TR1 (A57-1) module to the SV3 (Y335-3) reverse gear solenoid valve. Look for corrosion, chafed wires, or loose connector pins that would cause high electrical resistance.

3. 3

   Test the Solenoid

   Disconnect the SV3 (Y335-3) solenoid and measure its winding resistance with a multimeter to see if it is out of specification or open.

4. 4

   Repair/Replace

   If high resistance is found in the wiring, repair the harness or replace the connector. If the wiring is intact but the solenoid fails the resistance test or is mechanically seized, replace the SV3 (Y335-3) solenoid valve.

5. 5

   Reset

   Perform the requested 'ISC' reset via the control panel to clear the fault state and restore normal transmission operation.