What are the characteristics of the chassis parts in the excavator accessories?

e often see excavators, but you don't know much about the accessories of excavators. Today, I will introduce the chassis parts of excavator accessories:

Chassis parts: including idler, idler, support roller, drive tooth, chain, chain link, chain pin, bucket shaft, four-wheel belt, chain rail assembly, idler bracket, slewing bearing, crawler, rubber crawler, Crawler assembly, crawler shoe, tensioning device, tensioning cylinder block, tensioning cylinder, universal cross shaft, chain plate screws, large spring, chain plate, chain link, chain guard, bottom guard plate excavator accessories.