Massey Ferguson A.42.24 – Vehicle Control Unit (VCU) or Hydraulic Control Module: External Hydraulic Valve 4 Issue

Indicates a fault within the tractor's external hydraulic remote system, specifically pointing to a connection problem, electrical fault, or mechanical failure (such as a sticking spool) on the 4th external hydraulic valve. When this code triggers, the remote hydraulics may become slow, weak, or completely unresponsive.

• 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 oil filter and transmission filter, as blocked filters restrict oil flow.

2. 2

   Inspect the hydraulic fluid for contamination or dirty oil, which can cause the spool valve to stick.

3. 3

   Inspect the electrical connections and wiring harness leading to External Hydraulic Valve 4 for corrosion, loose pins, or broken wires.

4. 4

   Check the hydraulic couplers (e.g., ISO 5675 female quick couplers) for damage or blockages.

5. 5

   Inspect the hoses for wear or internal collapse.

6. 6

   Test the system pressure to rule out a failing hydraulic pump or a faulty relief valve.

1. 1

   Relieve hydraulic pressure

   Relieve all hydraulic system pressure by lowering all implements and cycling the hydraulic levers with the tractor turned off.

2. 2

   Disconnect battery

   Disconnect the tractor's battery to prevent electrical shorts.

3. 3

   Locate valve

   Locate External Hydraulic Valve 4 on the rear remote valve stack or lift cover.

4. 4

   Clean area

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

5. 5

   Disconnect harness

   Disconnect the electrical solenoid harness from Valve 4.

6. 6

   Disconnect hoses

   Disconnect and cap the hydraulic hoses/lines attached to the valve.

7. 7

   Remove mounting bolts

   Remove the mounting bolts securing the valve to the base plate or valve stack.

8. 8

   Rebuild or replace valve

   If rebuilding the valve, disassemble the spool and replace the internal O-rings and seals using an OEM repair kit. If replacing the entire unit, prepare the new valve.

9. 9

   Install valve

   Install the new or rebuilt valve, ensuring it seats correctly against the hydraulic pump/base plate.

10. 10

    Torque bolts

    Torque the mounting bolts to the manufacturer's specifications.

11. 11

    Reconnect lines and harness

    Reconnect the hydraulic lines and the electrical harness.

12. 12

    Test system

    Top up the hydraulic fluid, reconnect the battery, and test the remote valve for proper operation and leaks. Clear the A.42.24 DTC using a compatible diagnostic tool.