John Deere CCU523916.0 – CCU: Hydraulic Oil Filter Bypassed

The hydraulic system's filtration is compromised because the hydraulic oil filters are clogged to the point where oil is bypassing them. This allows contaminants to enter the hydraulic system. This maintenance-related fault indicates an immediate need for filter replacement and can lead to operational issues, such as a loss of throttle control and the activation of a red STOP light on the dashboard.

• 8330
• 650K

1. 1

   Verify that fault code CCU 523916.0 is actively logging.

2. 2

   Check for related fault codes, such as CCU 523916.15 (Hydraulic oil filter restricted) or CCU 523916.16 (Hydraulic oil filter bypassed).

3. 3

   Determine if the hydraulic filters were recently replaced; if the code appears immediately after a filter change, the primary suspect is a faulty hydraulic filter restriction sensor rather than the filters themselves.

1. 1

   Park the Machine Safely

   Park the tractor on a level surface, lower all implements to the ground, stop the engine, and engage the park lock.

2. 2

   Gather Necessary Parts and Tools

   Gather new John Deere OEM hydraulic filters, a filter wrench, a drain pan, and clean hydraulic oil.

3. 3

   Locate the Hydraulic Filters

   Locate the hydraulic filters. Location varies by machine (e.g., rear right-side door on a 650K dozer). Note if there are multiple filters, such as a hydraulic and transmission filter, that require simultaneous replacement.

4. 4

   Replace the Filters

   Place a drain pan under the filter to catch any spilling oil. Use a filter wrench to loosen and remove the old filter. Apply a thin layer of clean hydraulic oil to the seal of the new filter. Install the new filter by hand until it makes contact with the mounting surface, then tighten it an additional 2/3 to 1 turn. Do not overtighten. If there are two filters, both should be replaced at the same time.

5. 5

   Address a Persistent Fault Code

   If the fault code returns shortly after replacing the filters, the hydraulic filter restriction sensor is likely faulty and should be replaced. This sensor is typically located near the hydraulic filters.

6. 6

   Check Hydraulic Oil Level

   After replacing the filters, start the engine and run it briefly. Operate several hydraulic functions. Then, stop the engine and wait 10-15 minutes before checking the oil level. Add oil if necessary to bring the level to the correct mark on the sight-glass.

7. 7

   Clear the Fault Code

   Once the repair is complete, clear the fault code from the CCU.