Cummins QSB4.5 Engine For Excavator | Tier 3 Exporter

As a specialized China-based exporter and factory supplier, we provide the Cummins QSB4.5 diesel engine—a Tier 3 / Stage IIIA certified 4.5L inline 4-cylinder power unit that sets a new benchmark for construction, generator set, and agricultural applications . Leveraging a Bosch high-pressure common rail fuel system that delivers up to 1600 bar injection pressure, this engine offers improved fuel efficiency and quieter operation compared to its predecessors, with a wide horsepower range from 110 to 170 hp (82-127 kW) and peak torque reaching 624 N·m . By sourcing directly from our facility, we eliminate intermediary costs and provide fully dyno-tested complete engines with ECUs, wiring harnesses, and EGR coolers, backed by a 12-month warranty. Unlike Tier 4 versions requiring complex aftertreatment, our QSB4.5 Tier 3 variant uses in-cylinder combustion technology only—no DPF, no SCR—which translates to lower upfront cost, simpler maintenance, and no regeneration cycles for equipment operators worldwide .