Massey Ferguson 0A.70.20 – Implement Control Module (ICM) or Tractor Control Unit (TCU): External Hydraulic Valve 7 Issue

Malfunction or communication failure associated with the 7th external hydraulic remote/auxiliary spool valve on the tractor, often indicating an electrical fault such as an open circuit, short circuit, or a failed solenoid.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Connect a compatible Massey Ferguson diagnostic tool to confirm 0A.70.20 is active and check for any secondary codes (e.g., voltage or CAN bus errors)

2. 2

   Locate External Hydraulic Valve 7 on the rear remote valve stack and inspect the electrical connector for dirt, moisture, corrosion, or pushed-back pins

3. 3

   Trace the wiring harness from Valve 7 back to the control module, looking for chafing, breaks, or rodent damage

4. 4

   Use a multimeter to check the resistance of the solenoid coil on Valve 7 to ensure it is not shorted or open

5. 5

   Ensure the tractor has adequate hydraulic fluid levels and that the hydraulic filters are not restricted

1. 1

   Relieve Pressure

   Turn off the tractor and cycle the hydraulic controls to relieve all residual hydraulic pressure in the system.

2. 2

   Disconnect Battery

   Disconnect the negative battery cable to prevent electrical shorts during the repair.

3. 3

   Remove Connections

   Disconnect the electrical harness connector from External Hydraulic Valve 7. Disconnect and cap the hydraulic lines attached to the valve to prevent fluid loss and contamination.

4. 4

   Remove the Valve

   Unbolt the tie-rods or mounting bolts holding the valve stack together or securing Valve 7 to the manifold. Carefully slide the faulty spool valve out, ensuring you do not lose or damage the O-rings between the valve slices.

5. 5

   Install New Valve

   Lubricate the new O-rings with clean hydraulic fluid. Position the new external hydraulic valve into the stack and torque the mounting bolts to the manufacturer's specifications.

6. 6

   Reconnect

   Reattach the hydraulic lines and plug in the electrical connector.

7. 7

   Test

   Reconnect the battery, start the tractor, and top off the hydraulic fluid if necessary. Use the diagnostic tool to clear the 0A.70.20 code. Operate the #7 remote to ensure proper function and check for leaks.