This OTTO belt tensioner (part number 347-7963) is designed for CAT excavator models 320D, 325D, 330D, and 336D. It maintains optimal fan belt tension for efficient cooling system performance and extends the lifespan of belt-driven components.

This OTTO belt tensioner is designed for Komatsu PC300, PC350-7, and PC300-8 excavators, compatible with engine model 6D114E. It includes universal part numbers 6743-61-4120 and 6742-01-5219, ensuring proper belt tension and stable accessory drive performance under demanding conditions.