Case IH 519575-13 - UCM – UCM: Steering valve controller calibration fault

The steering valve controller has lost its calibration data, the steering deadzone calibration is out of range, or the system requires a seasonal re-calibration to function properly with the autoguidance system.

• MAGNUM AFS Connect
• AFS Connect Magnum Tractors (Models 180, 200, 220, 240, 250, 280, 310, 340, 380)
• Case IH Steiger
• Case IH Puma
• Case IH Maxxum
• Case IH Flagship Combines
• Case IH Mid Range Common Cab Combines

1. 1

   Ensure the hydraulic fluid is at normal operating temperature, as cold oil will cause calibration failures

2. 2

   Measure the steering cylinder rod length to ensure it is within 1/4 inch on both sides, adjusting mechanically if needed

3. 3

   Verify that the Guidance Enable Switch is set to ENABLE (cycle OFF/ON after engine start if needed)

4. 4

   Verify that the steering valve is ENABLED (YES) in the HH Menu / H3

5. 5

   Check the display and Nav controller firmware versions for compatibility issues, particularly on Tier 4A Magnums with Class V front axles

1. 1

   Warm Up

   Start the vehicle and warm up the hydraulic fluid to normal operating temperature.

2. 2

   Navigate to Calibration

   On the Pro 700 / AFS display, go to TOOLBOX > CALIBRATION > CALIBR.

3. 3

   Rear Wheel Position Calibration

   Drive the machine straight (guidance engaged is preferred). Press OK to save the center position.

4. 4

   Steering Valve Calibration

   Select the Steering Valve deadzone calibration. It is recommended to use the 'Auto Cal' automatic process.

5. 5

   Execution

   Perform one coarse calibration, followed by three fine calibrations. Caution: The machine will turn its own wheels abruptly during the Steering Proportional Gain calibration. Ensure the area is clear.

6. 6

   Dealer Verification

   If the calibration repeatedly fails, the steering valve or controller may be defective. Replacement of the valve requires a mandatory pre-calibration of the valve and Wheel Angle Sensor (WAS) by a CNH dealer using the Electronic Service Tool (EST).