Massey Ferguson A.42.11 – Transmission Control Unit (TCU): External Hydraulic Valve 4 Issue

The onboard diagnostic system has detected an electrical or connection problem with the solenoid valve that controls the 4th external hydraulic remote, typically indicating an open circuit, a short circuit to earth, a short circuit between cables, or a current level error at Solenoid Valve 4.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 5600 Series
• 5608–5613
• 5700SL Series
• 5710SL–5713SL
• 7600 Series
• 7614–7626
• 7700 Series
• 7714–7726S
• 8600 Series

1. 1

   Check the hydraulic fluid level and condition for dark, burnt-smelling, or milky fluid (indicating water contamination), and inspect for a partially blocked hydraulic filter

2. 2

   Inspect the wiring harness and connectors leading to External Hydraulic Solenoid Valve 4 for damaged wires, corrosion, or loose connections

3. 3

   Use a multimeter to test Solenoid Valve 4 for continuity and correct resistance to rule out an internal short or open circuit within the coil

4. 4

   If the electrical circuit is intact, test the system pressure with a hydraulic gauge to determine if the valve is mechanically failing to hold or direct pressure

1. 1

   Address Fluid Issues

   If the hydraulic fluid is contaminated or degraded, drain the system, replace the hydraulic filter, and refill with the correct UTTO (Universal Tractor Transmission Oil) fluid.

2. 2

   Repair Wiring

   If the diagnostic checks revealed damaged wiring or corroded connectors at the Solenoid Valve 4 harness, repair or replace the affected wiring.

3. 3

   Replace the Solenoid Valve

   If the wiring is intact but the valve's coil fails electrical testing or the valve is mechanically stuck, remove the faulty Solenoid Valve 4 from the rear axle valve block. Clean the mounting area and install the new replacement solenoid valve.

4. 4

   Clear Codes

   Connect a compatible diagnostic tool or interface device to the tractor to clear the DTCs from the system.

5. 5

   Operational Test

   Start the tractor and test the 4th external hydraulic remote with an implement to ensure proper operation and verify that the code does not return.