John Deere 524228.05 – TCU: Park Sump Block Solenoid Circuit Fault

The transmission control unit has detected an electrical fault within the circuit for the park sump block solenoid. The '.05' suffix indicates a 'current below normal or open circuit' condition, meaning the control unit is not detecting the expected electrical current when attempting to actuate the solenoid. This points to a break in the wiring, a faulty solenoid coil, or a poor connection, which can prevent the park brake system from operating correctly.

• 7610
• 7710
• 7810
• 7720
• 7820
• 7920
• 8130
• 8230
• 8330
• 8430
• 8530
• 8245R
• 8400R
• 8310RT
• 8320RT
• 8335RT
• 8345RT
• 8360RT
• 8370RT
• 9230
• 9330
• 9430
• 9530
• 9630
• 9470RT
• 9520RT
• 9570RT

1. 1

   Cycle tractor power to see if the intermittent electrical fault clears

2. 2

   Inspect the fuses related to the transmission control unit

3. 3

   Check transmission and hydraulic oil levels, as low fluid can sometimes trigger transmission-related fault codes

1. 1

   Locate solenoid

   Consult the specific technical manual for your machine to locate the Park Sump Block Solenoid, as its exact location varies by tractor model.

2. 2

   Inspect wiring and connector

   Carefully examine the wiring harness leading to the solenoid for any signs of damage, such as chafing, cuts, or corrosion. Inspect the electrical connector for bent, broken, or corroded pins.

3. 3

   Test solenoid resistance

   Safely park the machine, shut down the engine, and remove the key. Disconnect the electrical connector from the Park Sump Block Solenoid. Using a multimeter, measure the resistance across the two pins of the solenoid. For 7610, 7710, and 7810 tractors, the specified resistance is 10.7 ohms (other models may vary). If the reading is infinite (open circuit) or near zero (short circuit), the solenoid is faulty and must be replaced.

4. 4

   Test wiring harness

   If the solenoid resistance is within specification, check for continuity on each wire from the solenoid connector to the corresponding pin at the control unit connector. Check for shorts to ground by measuring the resistance from each wire to the tractor chassis (reading should be infinite).

5. 5

   Replace faulty components

   Replace the solenoid with a new OEM part if it failed the resistance test. If the wiring harness is damaged or failed the continuity/short tests, repair or replace it as necessary.