Massey Ferguson 04.00.56 – TRANS (Transmission Control Module): Transmission Filter Blockage Sensor Issue (TRANS)

This fault code indicates a signal error or malfunction related to the transmission filter blockage switch (sensor X20). The code specifically flags an issue or signal error with the sensor itself, rather than just a blocked filter.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 4707
• 4708
• 4709
• 4710
• 5425–5480
• 5608–5613
• 5710SL–5713SL
• 6445–6499
• 7614–7626
• 7714–7726
• 8260–8280
• 8600 series

1. 1

   Check fluid temperature — cold, thick hydraulic oil can sometimes trigger false filter blockage warnings. Ensure the fault persists at normal operating temperature.

2. 2

   Inspect fluid and filter condition — check the transmission/hydraulic fluid level and condition, as a severely clogged filter can cause erratic sensor readings.

3. 3

   Check for contamination — if the filter is genuinely blocked, inspect the filter element and oil for metal filings or fibrous debris (a common early warning sign of internal brake disc breakup).

4. 4

   Inspect sensor wiring — locate the filter blockage sensor (X20) on the right-hand side of the gearbox/transmission housing. Check the wiring harness and connector for breaks, corrosion, or loose connections.

1. 1

   Prepare machine

   Park the tractor on a level surface, turn off the engine, and engage the parking brake.

2. 2

   Locate sensor

   Locate the transmission filter blockage sensor (X20) on the right side of the transmission housing.

3. 3

   Clean area

   Thoroughly clean the area around the sensor to prevent dirt from entering the hydraulic system.

4. 4

   Disconnect wiring

   Disconnect the electrical connector from the sensor.

5. 5

   Remove faulty sensor

   Unscrew the faulty sensor from the filter housing/block. Have a catch pan ready, as a small amount of hydraulic fluid may leak out.

6. 6

   Install new sensor

   Install the new OEM sensor and tighten it to the manufacturer's specified torque.

7. 7

   Reconnect wiring

   Reconnect the electrical wiring harness.

8. 8

   Replace filter and fluid

   If you haven't already, it is highly recommended to replace the transmission oil filter and top off the hydraulic/transmission fluid with the correct AGCO specification fluid.

9. 9

   Verify repair

   Start the tractor, allow the oil to warm up, and verify that the fault code has cleared and no leaks are present.