John Deere CCU001638.00 – CCU: Hydraulic Oil Level or Cooler Issue

The fault code indicates a potential issue with the hydraulic oil level or the transmission hydraulic oil cooler. The system may be detecting an abnormal condition related to these components.

1. 1

   The hydraulic oil level in the sight glass on the rear differential

2. 2

   The transmission hydraulic oil cooler for damage or blockage

1. 1

   Check

   Check the hydraulic oil level in the sight glass on the rear differential. Ensure it is within the recommended range.

2. 2

   Inspect

   Inspect the transmission hydraulic oil cooler for signs of damage, blockage, or leakage.

3. 3

   Contact

   If the code returns after checking the above, contact a John Deere technician immediately for further diagnosis.