Massey Ferguson A.40.28: External Hydraulic Valve 4 Issue

Indicates a fault within the hydraulic system, likely an electrical fault, wiring issue, or solenoid failure on 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

   Retrieve and verify codes using a compatible diagnostic tool to confirm if A.40.28 is isolated or accompanied by connection-specific codes like 0A.41.FF

2. 2

   Inspect the wiring harness, connectors, and pins leading to External Hydraulic Valve 4 for corrosion, breaks, or loose fittings

3. 3

   Consult the OEM service manual to locate Valve 4 on the hydraulic block and perform multimeter tests on the solenoid

1. 1

   Locate valve block

   Locate the external hydraulic valve block at the rear of the tractor.

2. 2

   Identify solenoid

   Identify the solenoid/spool slice corresponding to Valve 4.

3. 3

   Repair wiring

   Repair any damaged wiring or clean the electrical connector.

4. 4

   Replace component

   If the connection is sound, replace the faulty electric spool slice or solenoid valve coil.

5. 5

   Clear DTCs

   Clear the DTCs using the diagnostic interface device.