All JCB EcoMax Tier IV Final engines over 56kw (75hp) run on Selective Catalytic Reduction (SCR) systems). SCR systems require DEF to ensure the engine meets the significantly reduced levels of exhaust NOx, particulate matter and hydrocarbons required by the emissions legislation.

Diesel Exhaust Fluid (DEF) is a highly purified, colorless liquid containing demineralized water (67.5%) and Urea (32.5%). DEF is specified under ISO 22241 and is marketed under various names such as AdBlue®, ARLA 32 or AUS 32.

DEF is injected into the mixer before the SCR catalyst. When the DEF is injected into the exhaust stream it turns into ammonia and water. This ammonia enters the catalyst and reacts with the NOx molecules to form nitrogen and water. Naturally occurring and harmless, they are then released into the atmosphere.

JCB sells DEF through its authorized JCB North American Dealer Network.