472 400 001 2 Heavy Series Coil for Gearbox

What does a gearbox housing coil do?

The gearbox housing heavy series coil acts as the electrical drive element within the electro-pneumatic valve assembly, managing gear, split, and range shifts in automated transmissions. It converts electrical signals from the control unit into a magnetic field, which opens the air valve to direct compressed air toward the shift actuator. This component is essential for maintaining precise shifting speed and overall transmission reliability in demanding environments.

Compatibility and application

This part is compatible with WABCO systems and is designed for use in heavy commercial vehicle transmissions, including those found in trucks and buses. It is specifically engineered to handle continuous vibration and high temperatures approaching 100°C around the transmission housing. When selecting a replacement, it is vital to verify the mounting position and connector type to ensure proper integration with the vehicle wiring harness.

Installation and maintenance

To ensure successful installation, technicians should check the winding resistance and verify that the connector pin layout matches the original component. Proper sealing of the O-ring and gasket is critical to prevent the ingress of moisture or dust, which could lead to electrical short circuits. Maintaining these seals ensures the longevity of the solenoid assembly under heavy-duty service conditions.

Troubleshooting guidance

If shift delays or fault codes occur, inspecting the coil's winding integrity and electrical resistance is a recommended troubleshooting step. Always verify that the nominal voltage matches the vehicle's 24V system requirements to avoid triggering electronic control unit faults. Consult your authorized distributor.

OE cross-reference

303.11.0054 (Gearbox Housing Heavy Series Coil) is the equivalent of the WABCO OE number. This part directly replaces WABCO OE number 4724000012.