Massey Ferguson A.40.19 – Auxiliary hydraulic controller / EHR (Electronic Hitch/Hydraulic Remote) control module: External Hydraulic Valve 4 Issue

Indicates an electrical or communication fault with the 4th auxiliary hydraulic remote valve. The system has detected a condition it cannot correct, which is typically an open circuit, a short to ground, a short to power, or a connection problem on the solenoid circuit that controls External Hydraulic Valve 4.

• 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

   Locate the external hydraulic valve block at the rear of the tractor and identify the 4th slice/spool (Valve 4).

2. 2

   Disconnect the electrical harness at the Valve 4 solenoid and inspect for water ingress, corrosion, bent pins, or loose connections.

3. 3

   Inspect the wiring harness leading to the valve for rub points or melted insulation. Use a multimeter to check for continuity, open circuits, or a short to ground between the valve connector and the hydraulic ECU.

4. 4

   Measure the resistance of the Valve 4 solenoid coil with a multimeter. Compare the reading to the manufacturer's specification. An infinite reading indicates an open coil (failed solenoid), while a reading of zero indicates a shorted coil.

5. 5

   If the wiring tests fine, temporarily swap the electrical connector from Valve 3 to Valve 4. If the fault code changes to indicate an issue with Valve 3, the solenoid on Valve 4 is confirmed faulty.

1. 1

   Preparation

   Park the tractor on a flat, level surface. Lower all attached implements to the ground. Turn off the engine and remove the key.

2. 2

   Relieve Pressure

   Cycle the hydraulic remote levers/buttons inside the cab multiple times to relieve any residual hydraulic pressure in the system.

3. 3

   Access the Valve

   Clean the exterior of the hydraulic valve block at the rear of the tractor thoroughly to prevent dirt from entering the hydraulic system during disassembly.

4. 4

   Remove the Solenoid

   Disconnect the electrical connector from the Valve 4 solenoid. Remove the retaining nut at the end of the solenoid stem. Slide the faulty solenoid coil off the valve cartridge.

5. 5

   Replace the Cartridge (If necessary)

   If the mechanical valve itself is sticking or leaking, use a wrench to unscrew the valve cartridge from the hydraulic block. Have a catch pan ready for minor fluid loss. Install the new cartridge and torque to OEM specifications.

6. 6

   Install New Solenoid

   Slide the new solenoid coil onto the stem and secure it with the retaining nut. Reconnect the electrical harness.

7. 7

   Fluid Check

   Check the tractor's hydraulic/transmission fluid level and top up if any fluid was lost during the repair.

8. 8

   Clear Codes & Test

   Start the tractor. Use a compatible Massey Ferguson diagnostic tool to clear the A.40.19 / 0A.40.19 fault code. Operate the 4th hydraulic remote to ensure proper function and check for leaks.