Massey Ferguson A.43.18: External Hydraulic Valve 4 Issue

This code indicates a fault, malfunction, or connection problem specifically isolated to the 4th external hydraulic remote valve (spool valve 4). This can be caused by electrical issues (such as a short circuit, open circuit, or poor harness connection to the valve's solenoid) or mechanical/hydraulic pressure failures within that specific valve section.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Check the hydraulic fluid (UTTO) level and inspect for a dark, burnt smell or a milky appearance indicating water contamination.

2. 2

   Inspect the wiring harness and electrical connector going directly to External Hydraulic Valve 4 for frayed wires, corrosion, or loose pins.

3. 3

   Check the hydraulic filters for blockages or heavy contamination (metal shavings/dust) that could be restricting flow to the valve block.

4. 4

   Use a hydraulic pressure gauge on the #4 remote coupler to see if the valve is failing to hold correct pressure or if the relief valve is triggering prematurely.

5. 5

   Check if the control valve is physically stuck by manually moving the control valve lever back and forth to unstick a bound internal spool.

1. 1

   Resolve Fluid/Filter Issues

   If the hydraulic fluid is degraded or contaminated, drain the system, flush it, and replace the hydraulic filters and fluid (UTTO 10W40 equivalent).

2. 2

   Repair Harness

   If the diagnostic check revealed a wiring fault to Valve 4, repair the damaged harness section or replace the solenoid connector. Clear the code to see if it returns.

3. 3

   Access the Valve Block

   If the issue is internal to the valve, relieve all hydraulic system pressure. Locate the rear external hydraulic valve stack and identify section #4.

4. 4

   Remove the Valve

   Disconnect the hydraulic lines and electrical connections to Valve 4. Unbolt the valve section from the hydraulic lift cover / manifold block.

5. 5

   Overhaul or Replace

   Depending on the damage, either rebuild the valve using an OEM seal/O-ring kit (if it was suffering from internal pressure loss/leakage) or replace the entire Valve 4 section.

6. 6

   Reassembly and Testing

   Reinstall the valve, torque to OEM specifications, and reconnect the lines and harness. Top off the hydraulic fluid. Run the tractor, actuate Valve 4, and test with a pressure gauge or implement to ensure the fault is cleared and pressure holds.