John Deere ACU523801.02 – ACU: Single Lever Control Problem

A fault has been detected within the single lever control system by the Armrest Control Unit (ACU). This issue directly affects the functionality and operation of Selective Control Valves (SCVs) III and IV. The system requires intervention to restore proper operation.

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1. 1

   Verify operator presence by ensuring the operator's hand is correctly placed on the control (rules out related Hand Presence Switch code ACU 523775.02)

2. 2

   Cycle the key switch or restart the tractor to see if the ACU code clears temporarily

3. 3

   Disable the single lever control functionality in the CommandARM display to allow direct use of SCV controls 3 and 4 as a temporary workaround

1. 1

   Cycle power

   Turn off the tractor and cycle the key switch to attempt to clear the ACU fault code.

2. 2

   Apply temporary workaround

   If the code persists and operation must continue, access the CommandARM display and disable the single lever control functionality. This allows direct use of SCV controls 3 and 4.

3. 3

   Contact dealer for service

   For a persistent fault, contact a John Deere dealer. Repairing the single lever control assembly typically requires specialized tools and software for diagnostics and calibration.