John Deere 523930.05 – SCO / SCU: Front Hitch/SCV VI Extend Solenoid Low Current

The Secondary Hydraulic Control Unit (SCO) has detected abnormally low electrical current in the circuit for the solenoid that controls the 'extend' function of the number six Selective Control Valve (SCV). This condition is typically caused by an open circuit, high resistance in the wiring, or a faulty solenoid coil, and it will affect the proper operation of the SCV component.

• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Restart the tractor to determine if the code was triggered by a temporary communication glitch.

2. 2

   Check fuse F29 (if the fault is logged by the SCO controller) or fuse F30 (if logged by the SCU controller).

3. 3

   Visually inspect the wiring harnesses and connectors leading to the front hitch valve or the SCV VI valve stack for chafed wires, broken wires, corrosion, or loose connections.

4. 4

   Inspect the area around the batteries and alternator for damage or debris that could affect the electrical system.

5. 5

   Perform a resistance test on the solenoid coil with a multimeter (an 'OL' or infinite reading indicates an open coil requiring replacement, while a reading of zero indicates a short circuit).

6. 6

   Perform a voltage test at the solenoid connector with the key on and the extend function activated to verify supply voltage is reaching the component. A lack of voltage points to a problem in the wiring or control unit, while voltage present with no solenoid activation ('click') suggests a failed solenoid.

1. 1

   Prepare the Tractor

   Park the tractor on a level surface, lower all hydraulic implements, shut off the engine, and remove the key to ensure safety.

2. 2

   Relieve Hydraulic Pressure

   Before disconnecting any hydraulic lines, relieve the system pressure by moving the hydraulic control levers back and forth several times.

3. 3

   Locate and Access the Valve

   The specific valve will be located either on the front of the tractor (for the front hitch) or within the rear SCV stack. Access may require removing protective covers or other components.

4. 4

   Clean the Area

   Thoroughly clean the area around the valve and solenoid to prevent contamination from entering the hydraulic system.

5. 5

   Disconnect and Remove the Solenoid

   Disconnect the electrical connector from the solenoid. Depending on the valve design, the solenoid may be a cartridge type that screws into the valve body. Use the appropriate size wrench to carefully unscrew and remove the solenoid. Be prepared for some residual hydraulic fluid to leak out.

6. 6

   Install the New Solenoid

   Ensure the new solenoid's O-rings are clean and lightly lubricated with new hydraulic fluid. Screw the new solenoid into the valve body and tighten it to the manufacturer's specified torque.

7. 7

   Reconnect and Test

   Reconnect the electrical connector. Start the tractor and test the function of the front hitch or SCV VI to ensure the repair was successful. Check for any hydraulic leaks around the new solenoid.

8. 8

   Reassemble

   Reinstall any covers or components that were removed for access.