CCU 523916.15 – Hydraulic Oil Filter Restricted

CCU 523916.15 (CCU )

Code: 523916.15



This fault code is activated when the hydraulic oil filter restriction sensor detects a pressure above 350 kPa (3.5 bar or 50.75 PSI) but below 425 kPa (4.25 bar or 61.64 PSI) while the engine speed is above 800 RPM for more than 15 seconds. This condition indicates that the hydraulic oil filter is becoming restricted, which can impede the flow of hydraulic oil and affect the overall performance of the hydraulic system.


The control unit degrades the functionality of the hydraulic system to prevent potential damage and ensure continued, albeit limited, operation until the issue is resolved.


  • Inspect Hydraulic Oil Filter: Check the hydraulic oil filter for signs of clogging or restriction. Replace the filter if it is found to be dirty or clogged to restore proper flow.
  • Check Hydraulic Oil Quality: Ensure the hydraulic oil is clean and free of contaminants that could contribute to filter clogging. Replace the hydraulic oil if necessary.
  • Monitor Pressure Levels: Use diagnostic tools to monitor the pressure levels within the hydraulic system and verify that they fall within the normal operating range after replacing the filter.
  • Evaluate System Load: Assess the hydraulic system’s load and usage to ensure it is not being subjected to conditions that could cause excessive filter restriction.
  • Regular Maintenance: Implement a regular maintenance schedule for checking and replacing hydraulic filters and oil to prevent future occurrences of this issue.


Regular inspection and maintenance of the hydraulic system, including filters and oil quality, are essential for preventing restrictions and ensuring optimal performance.

Control Units: John Deere

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