Massey Ferguson 0A.70.19 – main implement/hydraulic electronic control system: External Hydraulic Valve 7 Issue

This code is generated when the tractor's onboard diagnostic system detects a malfunction, connection problem, or pressure irregularity on the 7th external hydraulic remote (spool) valve. This can be caused by an electrical connection issue at the valve's solenoid, a sticking spool, or internal fluid leakage preventing the valve from holding pressure.

• 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

   Electrical Inspection: Check the wiring harness and connector going to the #7 external hydraulic valve solenoid for corrosion, damage, or a loose connection.

2. 2

   Spool Leakage Check: Position the control handle in 'Neutral', connect a hydraulic hand pump to the affected control valve port, and pressurize the port to 2,500 psi. If the port cannot hold pressure, oil is leaking around the spool. This indicates a damaged spool or spool bore, a weak centering spring failing to return the spool to neutral, or foreign matter trapped inside the valve.

1. 1

   Preparation

   Relieve all hydraulic pressure from the system and ensure the tractor is off. Clean the front and rear of the valve body to prevent contamination.

2. 2

   Disconnect Linkage/Wiring

   Remove the linkage, lever, or electronic actuator from the front of the spool.

3. 3

   Remove Rear Pipe/Plug

   Unscrew the large pipe or slotted plug from the rear of the valve. Note: This plug is often up against a spring and may be spring-loaded, so remove it carefully.

4. 4

   Extract the Spool

   Pull the pipe and valve spool out the back of the valve. Use a small magnet to carefully withdraw the centering spring, ball cup, and detent balls.

5. 5

   Clean and Inspect

   Disassemble, clean, and inspect the valve bore and spool to ensure no foreign contamination is present. Look for scoring or damage.

6. 6

   Rebuild or Replace

   If the bore is heavily damaged, the entire valve must be replaced. Otherwise, replace the seals and O-rings using an OEM repair kit.

7. 7

   Reassembly

   Reinstall the detent balls, spring, and spool into the valve body. Reattach the rear plug and front actuator/linkage.

8. 8

   Test

   Repeat the 2,500 psi pressure test to ensure the leak is resolved, then clear the DTC from the system.