Massey Ferguson 04.03.49 – TRANS: Transmission Filter Blockage Sensor Issue

The controller is receiving an erratic, out-of-range, or missing electrical signal from the transmission filter blockage sensor (X20).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 4707
• 4708
• 4709
• 4710

1. 1

   Verify transmission/hydraulic oil filter condition. A heavily contaminated filter or dirty oil can cause pressure spikes that make the sensor behave erratically.

2. 2

   Inspect the X20 Transmission filter blockage sensor wiring harness and connector for breaks, chafing, or corrosion.

3. 3

   Test the X20 sensor for internal shorting or an open circuit using a multimeter.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve any residual hydraulic pressure.

2. 2

   Filter Replacement (Recommended)

   If the transmission filter hasn't been changed recently, drain the filter housing and replace the transmission oil filter to rule out actual fluid restriction.

3. 3

   Disconnect the Sensor

   Locate the X20 filter blockage sensor on the filter housing block. Carefully unplug the electrical connector.

4. 4

   Remove the Sensor

   Place a catch pan underneath to catch any residual hydraulic fluid. Use a wrench to unscrew the faulty sensor from the housing.

5. 5

   Install the New Sensor

   Thread the new OEM sensor into the housing and tighten it to the manufacturer's torque specification.

6. 6

   Reconnect and Top Up

   Reconnect the electrical harness to the new sensor. Check the transmission/hydraulic oil level and top up any fluid lost during the swap.

7. 7

   Clear Codes

   Turn the ignition on and use a diagnostic tool to clear the 04.03.49 DTC from the TRANS module. Run the tractor and verify the code does not return.