Case IH U76 – Transmission Controller / Central Control Unit (CCU): Quick fill calibration value too low

This fault code indicates an error during the transmission clutch calibration process. Specifically, the system detects that the quick fill calibration value (the volume or time required to fill the clutch pack with hydraulic fluid to the point of engagement) is below the acceptable minimum threshold.

• Puma/Mid Range Magnum
• Puma Series 125
• Puma Series 165
• Puma Series 180
• Puma Series 195
• Puma Series 210
• Puma Series 225 CVX
• Magnum Series MX210
• Magnum Series MX230
• Magnum Series MX255
• Magnum Series MX285
• Farmall Series 40
• Farmall Series 45
• Farmall Series 50 (with CVT)
• Farmall Series 115U
• MX Series
• TG Series

1. 1

   Inspect the wiring harness and connectors leading to the transmission clutch solenoid for open circuits, shorts to ground, or poor pin connections

2. 2

   Test the clutch solenoid coil for proper resistance and verify that the valve spool is not mechanically stuck or damaged

3. 3

   If the electrical circuit and solenoid are functioning correctly, inspect for a mechanical problem inside the clutch pack (e.g., worn clutch plates, failed seals, or a mechanical bind)

1. 1

   Resolve Electrical Faults

   Repair any broken wires or corroded connectors found during the wiring inspection.

2. 2

   Replace Solenoid

   If the clutch solenoid is damaged or fails electrical testing, replace the solenoid valve or the solenoid coil.

3. 3

   Mechanical Repair

   If steps 1 and 2 do not resolve the issue, a mechanical teardown of the transmission clutch pack will be required to replace worn mechanical components.

4. 4

   Clear Codes and Reset EEPROM

   Turn the ignition key switch ON. Access the Central Control Unit (CCU) menu. Navigate to the H8 menu to clear all calibration values and stored fault codes by resetting all EEPROM values back to default (the lower central display will show 'EECL'). (Note: If you only want to erase stored error codes without erasing other calibration information, use the HC menu instead).

5. 5

   Recalibrate

   Perform the transmission clutch calibration procedure again to establish new, correct quick fill values.