John Deere SCO523936.05 – SCO: Flow Control Valve Solenoid Current Problem

The Secondary Hydraulic Control Unit (SCO) has detected an electrical issue with the flow control valve solenoid, which manages hydraulic flow for the selective control valves (SCVs). On some models like the 9230, 9330, 9430, 9530, and 9630 series, this code is described as 'SCV VI Retract Solenoid Circuit Current Low'. This points to a problem within the solenoid's electrical circuit, such as an open circuit, a short circuit, or an out-of-specification current reading.

• 7610
• 7710
• 7810
• 7720
• 7820
• 7920
• 7630
• 7730
• 7830
• 7930
• 8120
• 8220
• 8320
• 8420
• 8520
• 9230
• 9330
• 9430
• 9530
• 9630
• 7715

1. 1

   Visually inspect the wiring harness and connectors leading to the flow control valve solenoid for any signs of damage, corrosion, or loose connections, and check the area around the batteries and alternator for any visible issues

2. 2

   Inspect the relevant fuses for the hydraulic system, specifically checking fuse F29 if applicable to your model

3. 3

   Restart the tractor to see if the code can be corrected by resetting the communication messages

4. 4

   Perform a solenoid resistance test using a multimeter (expected resistance is 3.10–4.10 ohms for 8120-8520 series tractors)

1. 1

   Prepare machine for service

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Lower all hydraulic equipment to the ground to release pressure, and safely disconnect the negative battery cable.

2. 2

   Locate the solenoid

   Find the flow control valve solenoid on the selective control valve (SCV) assembly. The exact location varies depending on the tractor model.

3. 3

   Remove the faulty solenoid

   Disconnect the electrical connector. Clean the surrounding area to prevent dirt from entering the hydraulic system, then unscrew the solenoid from the valve body. Be prepared for some hydraulic fluid to leak out.

4. 4

   Install the new solenoid

   Ensure the new solenoid and valve body are clean. Screw the new solenoid into the valve body, tighten to the manufacturer's specified torque, and reconnect the electrical connector.

5. 5

   Test and verify

   Reconnect the negative battery cable, start the tractor, and check for hydraulic leaks. Operate the associated hydraulic function to ensure proper operation, then clear the fault code from the control unit.