New Holland UCM 4372 – UCM: Ground Drive: Solenoid Left (B) Supply Short to Ground

The electrical supply circuit providing power to the left ground drive solenoid (B) has experienced a short circuit to the ground/chassis.

• L213
• L215
• L218
• L220
• L223
• L225
• C238

1. 1

   Turn off the machine and disconnect the negative battery cable before beginning electrical checks

2. 2

   Inspect the wiring harness connecting the UCM to the Ground Drive Solenoid Left (B) for any physical damage, chafing, or exposed wires causing a short to the chassis ground

3. 3

   Check the UCM power supply and fuses (such as F-026 UCM BATTERY FUSE and F-027 UCM 2SPD FUSE) to see if the short circuit has caused a related fuse to blow

4. 4

   Inspect the connectors (e.g., the solenoid to chassis connectors) for corrosion, moisture, or bent pins

1. 1

   Safely park the machine on level ground and turn off the engine.

2. 2

   Disconnect the negative battery cable or switch the battery disconnect to the "off" position.

   This prevents electrical damage while working on the electro-hydraulic controls.

3. 3

   Locate the Left Ground Drive Solenoid (B) on the hydraulic drive system.

4. 4

   Disconnect the electrical connector at the solenoid.

5. 5

   Repair the shorted section of the wire or replace the affected harness segment.

   Perform this if the diagnostic checks revealed a damaged wiring harness.

6. 6

   Remove the faulty cartridge solenoid valve from the hydraulic block.

   Perform this if the wiring is intact but the solenoid itself is internally shorted to ground.

7. 7

   Install the new replacement solenoid valve and torque to the manufacturer's minimum tightening specifications for normal assembly.

8. 8

   Reconnect the solenoid electrical connector.

9. 9

   Reconnect the negative battery cable.

10. 10

    Use a diagnostic tool (EST) or DTC eraser to clear the UCM 4372 fault code from the system memory, then test the machine's ground drive to ensure the fault does not return.