A Diesel Exhaust Fluid Pump provides a means for injecting diesel exhaust fluid into the mixer for selective catalytic reduction. It is used to supply pressurized fluid to the dozer injector, so it can deliver the fluid in an atomized spray into the selective catalyst reduction (SCR) chamber. Within the chamber, a chemical reaction takes place, and the result is a reduction in oxides of nitrogen (NOx). Mostly used in Cat 2384D, 2484D, 559D, and 579D Tree Harvester, 312F, 313F, 314F, 315F, 316F, 318F, 320, 320F, 321F, 323F, 325F, M314, M314F, M315F, M316F, M317F and M323F Excavators, AP500F, AP555F, AP600F, and AP655F Paving Equipment, C4.4 Engine (Piston), CCS9, CP11, CP12, CP14, CP16, CP54B, CP56B, CP68B, CP74B, CS11, CS12, CS14, CS16, CS19, CS54B, CS56B, CS64B, CS66B, CS68B, CS74B, CS76B, CS78B and CW34 Compactor, D4 and D6K Track Type Tractor, PL61 Pipelayer. DEF (Diesel Exhaust Fluid Pump)