John Deere 000734.05 – Transmission Control Unit: Transmission Solenoid Circuit Fault

The system has detected a circuit fault for a transmission solenoid, requiring immediate attention to prevent further damage or operational issues. The .05 suffix indicates that the current in the circuit is below the normal range or that the circuit is open. Depending on the transmission type, this fault affects the forward solenoid (Power Quad), low clutch solenoid (IVT), or clutch C1 solenoid (PowerShift).

• 7720
• 7210J

1. 1

   Check the transmission/hydraulic oil level.

2. 2

   Inspect the condition of the batteries and alternator connections, as voltage issues can sometimes cause erroneous fault codes.

3. 3

   Check the wiring and connectors between the relevant transmission solenoid and the transmission control unit for signs of open circuits, short circuits, or high resistance.

4. 4

   Test the solenoid itself to ensure it is functioning correctly; a shorted or failed solenoid coil can trigger the controller to shut down the circuit.

5. 5

   Check for a stuck lube relief valve in the transmission, which can cause an air suction leak to the transmission pump (noted in cases where the tractor will not move forward).

1. 1

   Identify and locate the solenoid

   Based on the specific transmission type (Power Quad, IVT, or PowerShift), consult the technical manual to identify the location of the forward solenoid, low clutch solenoid, or C1 clutch solenoid.

2. 2

   Remove the faulty solenoid

   Carefully remove the faulty solenoid. Exercise caution during this process, as other components such as springs within the valve assembly may become dislodged.

3. 3

   Inspect the valve assembly

   With the solenoid removed, inspect the valve for any other parts that may have fallen out or become stuck, such as springs or the valve itself.

4. 4

   Install replacement solenoid

   Install the new solenoid, ensuring all internal valve components are correctly seated.

5. 5

   Clear codes and test

   Clear the diagnostic trouble codes and operate the tractor to confirm that the fault has been resolved. If the problem persists, a more in-depth diagnosis of the transmission's electrical and hydraulic systems by a qualified technician is recommended.