John Deere ACU524019.31 – ACU: Left Reverse Problem

The Armrest Control Unit (ACU) has detected a malfunction in the operation of the left-hand reverser lever. This fault indicates an issue related to the left reverse function of the machine, which may be caused by an electrical circuit problem, the lever being held in an invalid position, or a conflict between switches within the reverser assembly.

• 7630
• 7730
• 7830
• 7930
• 7720
• 7820
• 7920

1. 1

   Restart the tractor to see if a system reset clears an intermittent fault

2. 2

   Verify the left-hand reverser lever is in the correct 'PARK' position before starting the machine

3. 3

   Check relevant fuses, specifically fuse F15 for the CAB switched power supply

1. 1

   Restart tractor

   Turn the tractor off and on again to perform a simple system reset, which can sometimes clear intermittent faults.

2. 2

   Verify lever position

   Ensure the left-hand reverser lever is in the 'PARK' position before starting. Faults can trigger if the lever is in gear at power-up or held in an invalid position.

3. 3

   Inspect fuses

   Check relevant fuses, such as F15 for the CAB switched power supply, to rule out basic electrical power issues.

4. 4

   Dealer diagnosis

   If basic checks do not resolve the issue, contact an authorized John Deere dealer. Advanced diagnostics using proprietary software and specialized tools are required to test the circuits and sensors associated with the left-hand reverser and the ACU.