Case IH U108 – Transmission Controller (TCU): Damper torque not readable

This code indicates that the control module is not receiving a valid signal from the damper torque sensor, which monitors the torque transmitted through the flywheel damper (slip clutch).

• Case IH Puma 125
• Case IH Puma 165
• Case IH Puma 180
• Case IH Puma 195
• Case IH Puma 210
• Case IH Puma 225 CVX
• Case IH Magnum MX210
• Case IH Magnum MX230
• Case IH Magnum MX255
• Case IH Magnum MX285
• Case IH Magnum 180
• Case IH Magnum 190
• Case IH Magnum 210
• Case IH Magnum 215
• Case IH Magnum 245
• Case IH Maxxum Series
• Case IH Farmall 95U
• Case IH Farmall 105U
• Case IH Farmall 115U Pro EP

1. 1

   Check the wiring harness and connectors leading to the transmission/engine torque sensor for damage, bent pins, or loose connections (addresses wiring problem).

2. 2

   Inspect the sensor itself for physical damage or debris interference (addresses damaged sensor).

3. 3

   Attempt to recalibrate the damper torque sensor before replacing any parts (addresses lost calibration value).

4. 4

   Verify that the flywheel damper was installed correctly and that the sensor is properly aligned, especially if recently serviced (addresses wrong damper installation).

1. 1

   Warm up transmission oil

   Ensure the transmission oil is warmed up (typically above 60°C / 140°F).

2. 2

   Enter calibration menu

   Enter the transmission calibration menu (H-menu) on the tractor's display.

3. 3

   Navigate to calibration channel

   Navigate through the channels using the 'up' and 'down' keys until you reach the damper torque calibration channel (often displayed as Ch 12 or 'dt').

4. 4

   Initiate calibration

   Press and hold the downshift button while the display shows 'dt'.

5. 5

   Observe engine speed

   The engine speed will automatically increase and set to 1200 RPM.

6. 6

   Hold button

   Keep holding; the display will remain on 'dt' while the procedure is in progress.

7. 7

   Complete calibration

   Upon completion, the display will show the calibrated torque value (a number between 11 and 244) followed by 'End', and the engine speed will return to idle.

8. 8

   Save calibration

   Cycle the key to save the calibration.

9. 9

   Split tractor

   If calibration fails or parts are damaged, split the tractor between the engine and transmission to access the flywheel damper assembly.

10. 10

    Disconnect drive shaft

    Remove the drive shaft shield and disconnect the drive shaft from the flywheel damper.

11. 11

    Remove faulty parts

    Remove the faulty damper and/or torque sensor.

12. 12

    Install new damper

    Install the new flywheel damper. Torque the mounting bolts to OEM specifications (e.g., 32 Nm / 24 lb-ft for Farmall models, or 70–94 Nm / 52–69 lb-ft for larger Magnum/Trident models).

13. 13

    Reassemble tractor

    Reassemble the tractor components.

14. 14

    Recalibrate damper torque

    You must perform the Damper Torque Calibration (Phase 1) after installing a new damper or sensor.