Massey Ferguson A.70.11 – Electronic Control Unit (ECU): External Hydraulic Valve 7 Issue

Malfunction in the circuit, position, or operation of the 7th external hydraulic spool valve (auxiliary 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

   Visually inspect the wiring harness and connectors leading to External Hydraulic Valve 7 on the rear remote stack for rub points, corrosion, or disconnected plugs

2. 2

   Test the solenoid coil resistance with a multimeter to check for an open circuit or a short to ground

3. 3

   Verify that the valve is receiving proper voltage from the ECU and that the ground integrity is solid

4. 4

   If the valve is equipped with a position sensor, check for missing or implausible voltage readings

5. 5

   Ensure the hydraulic system has adequate pressure and that there is no physical blockage preventing the spool from actuating

1. 1

   Depressurize the System

   Turn off the tractor and actuate the hydraulic levers/controls to relieve all residual hydraulic pressure in the system.

2. 2

   Disconnect Electricals

   Locate External Hydraulic Valve 7 on the rear remote valve stack and disconnect the electrical harness connector from the solenoid and position sensor.

3. 3

   Solenoid Replacement (If applicable)

   If only the solenoid coil has failed, remove the retaining nut at the end of the spool, slide off the old coil, install the new coil, and tighten the nut.

4. 4

   Valve Section Replacement (If mechanically failed)

   Unbolt the specific valve slice (Valve 7) from the hydraulic stack tie-rods. Be prepared to catch leaking hydraulic fluid.

5. 5

   Install New Valve

   Insert the new spool valve section, ensuring that all O-rings and seals are perfectly seated between the valve slices to prevent internal leaks.

6. 6

   Reassembly

   Torque the stack tie-rod bolts to the manufacturer's exact specifications. Reconnect the electrical harness.

7. 7

   Testing

   Top up the hydraulic fluid to the correct level on the dipstick/sight glass. Start the tractor, operate the valve to bleed air from the system, and check for leaks.

8. 8

   Clear Codes

   Use a compatible diagnostic tool to clear the 0A.70.11 code from the ECU memory.