Massey Ferguson A.33.29 – Central onboard diagnostic system: External Hydraulic Valve 3 Issue

The tractor's onboard diagnostic system has detected a malfunction—likely an electrical fault such as a signal voltage issue, open circuit, or short—in the circuit controlling the third rear external hydraulic remote (spool 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

   Use a compatible diagnostic tool or interface device to retrieve and verify the active 0A.33.29 code.

2. 2

   Inspect the wiring harness and electrical connectors leading to the External Hydraulic Valve 3 (rear remote block) for physical damage, corrosion, or loose connections.

3. 3

   Check for signal voltage irregularities at the spool valve solenoid, as related codes often point to "Signal Voltage Issues".

1. 1

   Safely park the tractor, lower all implements, turn off the engine, and relieve all hydraulic system pressure.

2. 2

   Locate the External Hydraulic Valve 3 assembly at the rear hydraulic remote stack.

3. 3

   Disconnect the electrical harness from the valve's control solenoid.

4. 4

   Test the wiring harness for continuity back to the ECU and test the solenoid coil for proper resistance.

5. 5

   If the wiring is intact but the solenoid/valve is faulty, remove the retaining bolts to replace the electronic solenoid coil or the entire valve section.

6. 6

   Reconnect the harness, power on the tractor, and use a diagnostic tool to clear the DTC.

7. 7

   Test the #3 hydraulic remote for proper operation.