Komatsu designed its new Parallel Link Undercarriage System (PLUS) with sealed and lubricated, rotating bushings to wear evenly without requiring a bushing turn. Komatsu testing and field trials suggests that it can last up to twice as long as conventional undercarriage. A taller, hardened link provides longer wear life. Segmented sprockets are designed to shed material which minimizes packing. Carrier rollers have a larger diameter to increase wear life, and track rollers with larger flanges and roller guards that contact the link instead of the pins help maintain track alignment.
