Holset 4037542 Turbocharger HX40 Assembly

The Holset HX40 turbocharger assembly (Part Number 4037542) is a fixed-geometry, wastegated unit designed for medium-duty diesel applications. It features a single-piece cast iron turbine housing with integrated wastegate valve for boost pressure regulation, and an aluminum compressor housing. The rotating assembly utilizes a full-floating bronze bearing system with thrust collar, lubricated by engine oil supply. This unit serves as original equipment on Cummins QSL 8.9L and 9.0L engine platforms (2004-2011 emissions tiers), commonly installed in Hyundai Heavy Industries (HCE) R320LC series hydraulic excavators. The compressor wheel utilizes a 60mm inducer / 82mm exducer configuration; the turbine wheel utilizes a 68mm inducer / 60mm exducer configuration. Direct OEM replacement for Cummins 4037542, 4038989H, 4039030, and 4041762H.