QSK19 EVERYTON. ? FOR MINING APPLICATIONS TIER 3/STAGE IIIA The Tier 3 approved QSK19 engine is a powerful example of Cummins Quantum System technology at work. In the QSK19, state-of-the-art electronic controls and Cummins modular common-rail fuel system ensure clean, efficient performance, minimum maintenance and superior uptime for quarry and underground equipment – in the same compact footprin