New Holland 3123 – TMF: PTO Torque Not CAL Error

The tractor's control system has detected that the PTO torque sensor has not been calibrated. This calibration is essential for the accurate measurement of the torque being applied through the PTO shaft. An uncalibrated sensor can lead to incorrect readings, which may negatively affect the performance and safety of the tractor's power take-off system and attached implements.

• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8
• 175
• 190

1. 1

   Verify tractor conditions: Ensure the tractor is on level ground with the park brake applied and all implements disconnected from the PTO shaft.

2. 2

   Check for related fault codes: Look for codes such as 3121 (PTO Torque sensor open circuit) or 3122 (PTO Torque sensor short circuit) which may indicate a hard fault rather than just a calibration issue.

3. 3

   Inspect wiring and connections: Check the wiring harness and connectors leading to the PTO torque sensor for any signs of damage, corrosion, or loose connections.

4. 4

   Check hydraulic oil temperature: Ensure the transmission/hydraulic oil temperature is within the required range (e.g., above 50°C) for the calibration procedure to be successful.

1. 1

   Enter Diagnostic/Calibration Mode

   Hold down the specific required buttons while starting the tractor to access the 'H' menu. For 175 and 190 models, install diagnostic switch (tool no. 380000488), start the tractor, and cycle the switch to enter calibration mode.

2. 2

   Navigate to Calibration Menu

   Once in diagnostic mode, navigate through the menus to locate the 'PTO Torque Sensor Calibration' setting.

3. 3

   Initiate Calibration

   Start the calibration process as prompted by the on-screen display. This typically involves running the engine at a specific RPM (e.g., 1200 RPM) and following the on-screen instructions.

4. 4

   Follow On-Screen Prompts

   Allow the system to guide you through the automatic sequences where the tractor's systems are tested and calibration values are stored.

5. 5

   Complete and Verify

   Wait for the 'End' message to appear. Turn the tractor off for a short period to allow the new calibration values to be stored in the controller's memory.

6. 6

   Replace PTO Torque Sensor

   If the calibration fails repeatedly, it indicates a fault with the PTO torque sensor itself or the associated wiring. Test or replace the sensor as necessary.