Massey Ferguson A.43.1F: External Hydraulic Valve 4 Issue

Indicates a fault within the circuit of the 4th external hydraulic remote valve (spool valve). The underlying condition is typically an electrical connection problem to the hydraulic valve, a stuck valve spool, or a failure in the valve's internal sealing/pressure holding capabilities.

• 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 level and inspect the fluid condition for a dark, burnt, or milky appearance (indicating water contamination).

2. 2

   Inspect the hydraulic filter for partial blockages that could restrict flow to the system.

3. 3

   Inspect the wiring harness and electrical connectors going to External Valve 4 for corrosion, damage, or loose connections.

4. 4

   Test the system pressure with a hydraulic gauge to pinpoint whether the issue is isolated to the valve itself, or if there is a broader pump or restriction issue.

5. 5

   Observe the control valve operation and attempt to manually move the pump control valve lever back and forth to see if a physically stuck valve can be released.

1. 1

   Flush and Replace Fluid

   Drain the old hydraulic fluid, replace the hydraulic filter, and refill with clean UTTO (Universal Tractor Transmission Oil) if contaminated.

2. 2

   Repair Wiring

   If the electrical connector to Valve 4 is damaged, clean the contacts with electrical contact cleaner or splice in a new connector pigtail. Clear the codes to see if A.43.1F returns.

3. 3

   Remove the Valve

   If the valve is internally leaking (e.g., implements dropping overnight) or physically stuck, depressurize the hydraulic system and remove the external hydraulic control valve assembly.

4. 4

   Clean and Overhaul

   Disassemble the valve. Clean the internal spool and replace all internal O-rings and seals.

5. 5

   Replace the Valve

   If the valve body is scored or the electronic solenoid has failed internally, replace the entire External Hydraulic Valve 4 unit.

6. 6

   Reinstall and Test

   Reinstall the valve, ensure all hydraulic lines and electrical connections are secure, and test the remote under load to ensure proper pressure and no leaks.