Massey Ferguson A.41.28: External Hydraulic Valve 4 Issue

A connection problem on a hydraulic valve indicating an electrical fault, communication loss, or physical connection issue with the 4th external hydraulic remote valve.

• 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

   Inspect the electrical harness, connectors, and solenoids plugging into External Hydraulic Valve 4 for corrosion, loose pins, or broken wires

2. 2

   Verify the hydraulic fluid level, as low fluid is the most common culprit for sluggish or failing hydraulic response

3. 3

   Inspect the hydraulic fluid condition for dark color, burnt smell, or milky appearance (indicating water contamination)

4. 4

   Check for a partially blocked hydraulic filter that could be restricting flow to the valve system

5. 5

   Use a hydraulic gauge to test the system pressure to pinpoint whether the issue is isolated to the valve, the pump, or a general restriction

1. 1

   Address Fluid and Filters

   If the fluid is contaminated, drain the system, flush it, and replace it with fresh UTTO (Universal Tractor Transmission Oil) fluid (e.g., 10W40). Replace the hydraulic filters (recommended every 300–500 hours).

2. 2

   Fix External Leaks

   Inspect the control valves, hoses, couplers, and seals around Valve 4. Even a slow seep can rob the system of pressure. Fix any leaks immediately.

3. 3

   Service the Valve

   If the electrical connections are sound but the valve is stuck or failing, remove the control valve. Clean the valve chamber and inspect the O-rings and seals.

4. 4

   Replace the Valve/Solenoid

   If the valve is internally scored, the solenoid is burnt out, or it cannot hold pressure (causing implements to drop overnight), replace the external hydraulic valve assembly.

5. 5

   Clear Codes

   After the repair, use a compatible diagnostic tool or interface device to clear the DTC from the tractor's system.