The Komatsu PC78US is a useful choice for buyers who need more working capability than a mini excavator but still operate on jobsites where rear clearance is limited. Its short-tail design makes the model especially relevant for urban construction, utilities, road work, trenching and other jobs where a conventional excavator of similar weight may require more space. For a used buyer, however, the PC78US name covers several generations. Machines such as the PC78US-6, PC78US-8, PC78US-10 and PC78US-11 differ in engines, controls, operating weight and other specifications. This guide explains how to decide whether this approximately 7- to 8-ton class machine ...