JCB 320/C9050 DEF Level Sensor Assembly

The 320/C9050 Mast Head Unit Level Sensor is a critical component of the Selective Catalytic Reduction (SCR) aftertreatment system. Designed to measure the level and temperature of Diesel Exhaust Fluid (DEF/AdBlue) within the storage tank, it provides real-time data to the engine control unit (ECU) for precise dosing control. This sensor assembly integrates a level float mechanism and temperature thermistor within a sealed header flange designed for direct tank mounting. It is engineered to withstand the corrosive nature of urea-based fluids and the vibration profiles typical of construction machinery. The unit replaces OEM part numbers 320/C9050, 320/D9238, and 320/B9364, ensuring form, fit, and functional parity with the original JCB equipment.