CLAAS Id7635h / 7635h (422) – TR2 (A57-2) Transmission Module: Transmission Oil Temperature Sensor Out of Bounds

The control unit detects that the transmission oil temperature provided by the sensor is either < 24 °C or > 150 °C, indicating a sensor or circuit failure.

• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Arion 410
• Arion 420
• Arion 430
• Arion 510
• Arion 520
• Arion 530
• Arion 540
• Arion 610
• Arion 620
• Arion 630
• Arion 640
• Arion 650
• Ares 500 series
• Ares 546
• Ares 600 series
• Ares 616
• Ares 697
• Ares 800 series
• Ares 836

1. 1

   Inspect the Transmission Oil Temperature Sensor (Component B123), its wiring harness, and the connector for an open circuit or a short circuit to ground/12V.

2. 2

   If the sensor and wiring are intact, test the 'Auto 5' Module (TR2 / A57-2) using CLAAS diagnostic tool n° 60 05 033 249.

1. 1

   Locate Sensor B123

   Find the transmission/hydraulic oil temperature sensor (B123) on the transmission housing.

2. 2

   Inspect Wiring

   Check the wiring harness leading to the TR2 (A57-2) module for chafing, breaks, or corrosion at the connector pins.

3. 3

   Test the Sensor

   Use a multimeter to measure the resistance of the B123 sensor. If it reads completely open (infinite resistance) or shorted (zero resistance), the sensor has failed internally.

4. 4

   Replace the Sensor

   Clean the area around the sensor. Drain the transmission oil below the level of the sensor port (or be prepared to swap the sensor quickly). Unscrew the faulty B123 sensor, install the new sensor (M14x1.5 thread), tighten it to the standard torque specification, and reconnect the wiring harness.

5. 5

   Module Testing

   If replacing the sensor does not clear the fault, connect CLAAS tool n° 60 05 033 249 to test the 'Auto 5' module. If the module fails the test, it must be replaced and reprogrammed.

6. 6

   Finalize

   Top up the transmission fluid to the correct level, clear the fault codes, and test drive the tractor to ensure the temperature registers correctly.