John Deere BIF000126.15 – CCU: Hydraulic Oil Filter Dirty

The fault code indicates that the hydraulic oil filter is dirty or restricted, impeding the flow of hydraulic oil. This condition can lead to reduced hydraulic efficiency, increased system temperatures, and potential damage to hydraulic components if not addressed promptly.

• 6105M
• 6120M
• 6125M
• 6140M
• 6155M
• 6175M
• 6195M
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9370R
• 9420R
• 9470R
• 9520R
• 9570R
• 9620R
• 6110
• 6210
• 6310
• 6410
• 8230T
• 8330T
• 8430T
• 9530T
• 9630T
• 317G
• 333G
• 1025R

1. 1

   Check hydraulic oil level using the sight glass or dipstick, as a low oil level can cause the pump to draw air and mimic a filter restriction.

2. 2

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

3. 3

   Inspect the transmission and hydraulic oil coolers for any buildup of dirt, dust, or debris that could restrict airflow and cause the oil to overheat.

4. 4

   Review the machine's service history to determine when the hydraulic filters were last changed (typically recommended every 750 or 1500 hours depending on the model).

1. 1

   Warm the oil

   Start the engine and operate a few hydraulic functions to warm the hydraulic oil. This will help it drain more completely.

2. 2

   Position and secure the tractor

   Park the tractor on a level surface. Lower all implements to the ground to release any stored hydraulic pressure. Shut off the engine, remove the key, and engage the park lock.

3. 3

   Drain the hydraulic oil

   Place a suitable container under the transmission and differential housing. Remove the drain plugs and allow the oil to drain completely.

4. 4

   Clean suction screen or magnet

   If equipped, remove the intake screen or magnetic plug. Wash the screen in fuel or clean metal shavings from the magnet before reinstalling.

5. 5

   Replace filters

   Unscrew the old hydraulic and transmission oil filters. Apply a light coat of clean hydraulic oil or grease to the sealing rings of the new filter elements. Screw on the new filters and tighten to manufacturer specifications. Always replace both the hydraulic and transmission filters at the same time if the system uses both.

6. 6

   Reinstall drain plugs

   Install new seal rings on the drain plugs and tighten them to the specified torque (e.g., 50 Nm or 37 lb.-ft. for the 6M series).

7. 7

   Refill hydraulic oil

   Fill the transmission case with new, clean John Deere-approved hydraulic oil (e.g., Hy-Gard). Refer to the operator's manual for correct fluid type and capacity.

8. 8

   Purge air and perform final checks

   Start the engine and let it run for a few minutes. Operate several hydraulic functions to circulate the new oil and purge air. Shut off the engine, wait 10-15 minutes, re-check the oil level, and top up if necessary.

9. 9

   Clear fault code

   Clear the fault code from the CCU. If the code returns, there may be an issue with the filter restriction sensor or associated wiring requiring further diagnosis.