The Hitachi EX200-2 excavator uses two types of carrier rollers – top carrier rollers and bottom carrier rollers. Top carrier rollers: • Part number: HH0521/HH0522 – These are the top front carrier rollers located under the front idler. They help support the weight of the tracks. • Specifications: Bottom carrier rollers: • Part number: HH0516/HH0517 – These are the bottom front carrier rollers located behind the front … Continue reading What is the typical lifespan of carrier rollers? »