John Deere CCU523916.16 – CCU: Hydraulic Filter Replacement Required

The hydraulic oil filter is restricted and likely being bypassed. This is a maintenance-related fault code triggered by the Central Control Unit (CCU) when the hydraulic oil filter restriction sensor detects high pressure, suggesting the filter is clogged with contaminants. When the engine speed is above 1500 rpm, this condition can cause the engine to be limited to 1500 rpm or force it to go to low idle.

• 7R Series
• 8R Series
• 8RT Series
• 7230R
• 8130
• 8230
• 8330
• 8430
• 8530
• 8560
• 8570
• 8760
• 8770
• 8870
• 8960
• 8970
• 9100
• 9200
• 9300
• 9400
• 9500
• 9600

1. 1

   Cycle the key switch to see if the code clears, as some codes can be corrected by simply cycling the tractor's power

2. 2

   Check the hydraulic oil level to ensure it is at the proper level, as low oil can cause other hydraulic system issues

3. 3

   Visually inspect the tractor and any implements for obvious signs of hydraulic oil leaks

4. 4

   Review associated codes (such as 523916.03 or 523916.04) and resolve them first if present

1. 1

   Park the machine

   Park the tractor on a level surface, lower all hydraulic implements, and stop the engine.

2. 2

   Access the filters

   Open the service doors and remove any side panels necessary to access the hydraulic filters.

3. 3

   Remove old filters

   Place a drain pan under the filters to catch any spilling oil. Use a filter wrench to remove the old filters. It is recommended to replace both hydraulic filters at the same time.

4. 4

   Prepare new filters

   Apply a thin film of clean hydraulic oil to the seals of the new filters.

5. 5

   Install new filters

   Install the new filters, tightening them by hand until they contact the mounting surface. Then, tighten an additional 2/3 to 1 turn.

6. 6

   Check for a faulty sensor

   If replacing the filters does not clear the code, the hydraulic filter restriction sensor may be faulty and require replacement.

7. 7

   Final checks

   After completing the repairs, start the engine and operate the hydraulic functions. Check the hydraulic oil level and inspect for any leaks.