Massey Ferguson A.42.18 – Main tractor controller / Electronic implement control system: External Hydraulic Valve 4 Issue

Electrical or connection problem with the 4th external hydraulic remote/spool valve, such as an open circuit, short circuit to earth, short circuit between cables, fast decay error, or current level error. The valve may default into a neutral position.

• 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
• 8600 Series

1. 1

   Check the hydraulic fluid level and condition (look for dark, burnt, or milky fluid indicating water contamination)

2. 2

   Inspect the wiring harness and electrical connections to Solenoid Valve 4 for open circuits, short circuits to ground, or short circuits between cables

3. 3

   Perform a visual inspection of external hydraulic valve 4 (spool valve) for external leaks, damaged O-rings, or worn seals

4. 4

   Test the system pressure with a hydraulic gauge to pinpoint whether the issue is a valve restriction, a failing pump, or a pressure loss

5. 5

   Ensure the hydraulic filter is not partially blocked, which can restrict flow to the system

1. 1

   Safety First

   Ensure the tractor is turned off and relieve all hydraulic pressure before servicing the system.

2. 2

   Drain Fluid (If Necessary)

   If the hydraulic fluid is contaminated or degraded, drain the fluid from the system.

3. 3

   Wiring Repair

   Disconnect the electrical harness to External Hydraulic Valve 4. Clean the contacts and repair any damaged wiring (shorts or open circuits) found during the diagnostic phase.

4. 4

   Valve Removal

   If the solenoid or the valve itself is faulty, remove the spool valve assembly.

5. 5

   Seal/Valve Replacement

   Replace worn O-rings and seals using a spool valve repair kit, or replace the entire solenoid valve 4 unit if the internal magnet output stage or position sensor has failed.

6. 6

   Reinstallation

   Reinstall the valve block and securely reconnect the electrical harness.

7. 7

   Filter Replacement

   Replace the hydraulic filter (recommended routine maintenance every 300–500 hours).

8. 8

   Refill Fluid

   Refill the system with clean OEM-approved UTTO (Universal Tractor Transmission Oil).

9. 9

   Testing

   Start the tractor, test the operation of remote valve 4, and check for leaks. Finally, clear the DTC using a compatible Massey Ferguson diagnostic tool.