Massey Ferguson T41B7 – TRANS: Transmission Oil Temperature Signal Issue DYNA VT (TRANS)

The transmission controller is receiving an abnormal, out-of-range, or missing electrical signal from the transmission oil temperature sensor.

• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• Interim Tier 4 (2012-2015)
• 6600 Series
• 6700S Series
• 8600 Series
• 8700S Series

1. 1

   Check transmission/hydraulic oil level using the sight glass or dipstick on a level surface, as low fluid can cause erratic temperature readings.

2. 2

   Inspect the wiring harness and electrical connector at the transmission oil temperature sensor (X19) for broken wires, corrosion, or loose pins.

3. 3

   Test the sensor with a digital multimeter to ensure resistance changes smoothly with temperature and check for a dead short to ground or an open circuit.

4. 4

   Verify the reference voltage coming from the TRANS controller to the sensor harness to rule out a broken wire in the main harness.

1. 1

   Preparation

   Park the tractor on level ground, lower the linkage/implements, turn off the engine, and allow the transmission fluid to cool.

2. 2

   Locate the Sensor

   Find the transmission oil temperature sensor (X19) on the transmission housing or hydraulic valve block.

3. 3

   Disconnect

   Unplug the electrical connector from the sensor.

4. 4

   Removal

   Place a clean drain pan under the sensor area to catch any escaping transmission fluid. Unscrew the faulty sensor from the housing.

5. 5

   Installation

   Thread the new temperature sensor into the housing. Ensure any required O-rings or sealing washers are in place to prevent leaks (many of these sensors use an M14 x 1.5 thread). Tighten to the manufacturer's torque specification.

6. 6

   Reconnection

   Reconnect the electrical harness to the new sensor.

7. 7

   Fluid Check

   Check the transmission fluid level and top up with the manufacturer-recommended fluid (e.g., AGCO Parts Transmission Oil) to replace any fluid lost during the swap.

8. 8

   Clear Codes & Test

   Use a compatible diagnostic tool (such as Jaltest AGV) to clear the T41B7 fault code from the TRANS module. Start the tractor and perform a test drive, ensuring the transmission shifts smoothly and the code does not return.