Case IH 519573-31 - UCM – UCM: Steering valve controller calibration fault

The electro-hydraulic steering valve has either failed its internal calibration routine, lost its deadzone parameters, or is reading data that conflicts with the tractor's current speed.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect (Models 180, 200, 220, 250, 280, 310, 340, 380)
• Case IH Steiger

1. 1

   Check hydraulic fluid temperature to ensure it is at normal operating temperature (cold oil will cause calibration to fail)

2. 2

   Inspect the LVDT (Linear Variable Differential Transformer) sensor connection directly on the hydraulic steering valve

3. 3

   Verify the physical condition and linkage of the Wheel Angle Sensor (WAS) located in the articulation hinge or front axle

4. 4

   Check the display (Diagnostics > Versions) for the current software versions of the UCM and Steering Valve Controller (SVC)

1. 1

   Warm Up the Tractor

   Run the tractor until the hydraulic oil reaches standard operating temperature.

2. 2

   Prepare for Calibration

   Move the machine to a wide-open area with field conditions similar to standard operation.

3. 3

   Calibrate the Wheel Angle Sensor

   Access the display (e.g., Pro 700 or Pro 1200). Go to TOOLBOX > CALIBRATION > CALIBR. Drive in a straight line and press OK to save the rear wheel/steering position. Verify that both steering cylinder rods are within ¼” length of each other.

4. 4

   Perform Steering Valve Deadzone Calibration

   In the same calibration menu, initiate the steering valve deadzone calibration. It is recommended to use the 'Auto Cal' automatic process, though a manual 'Automated Steering Deadzone' method can also be used. Caution: The wheels will move abruptly during the proportional gain calibration.

5. 5

   Flash/Update Software

   If the calibration repeatedly fails or the tractor wanders off-line, the UCM and SVC software must be updated by a dealer.

6. 6

   Replace Hardware

   If software updates and calibrations do not clear the fault, the physical steering angle sensor or the electro-hydraulic steering valve itself is internally faulty and must be replaced.