Bosch 098644D228 DEF Pump Assembly Denoxtronic 2.2

The Bosch 098644D228 is a 12V Diesel Exhaust Fluid (DEF) pump, also known as a Denoxtronic 2.2 dosing module or urea supply module. It is a critical component of the Selective Catalytic Reduction (SCR) aftertreatment system, metering and delivering aqueous urea solution to the exhaust stream to reduce NOx emissions. This unit serves as a direct replacement for Caterpillar OEM part number 20R-4049. It is engineered for compatibility with Caterpillar C9.3B, C7.1, and C13 engine platforms installed in wheel loaders (420XE, 416, 428) and soil compactors (CB7, CB8). The module features a 5-outlet configuration and integrates the pump, filter, heating element, and pressure sensor into a single housing. Cross-reference interchange includes Bosch 0444042165, 0444042059, 0444042060, 0444042166, and Caterpillar 398-4746, 591-2385, T414988. The component is manufactured to meet OEM specifications for flow rate, pressure regulation, and durability in heavy-duty off-highway operating cycles.