Excavator chassis accessories mainly have four wheels: four wheels refer to support wheels, driving wheels, guide wheels and traction sprockets; Belt refers to the crawler belt. \ x0d \ x0d \ roller: As the name implies, it plays a supporting role and is located between the lower surface of the left/right cross beam of the underframe and the crawler, depending on the tonnage of the excavator. Usually there is 5- 10 on one side. \x0d\ Driving wheel: It plays the role of driving the crawler, is fixed on the walking motor, and transmits the driving force of the walking motor to the crawler through the gear structure. Usually there is 1 on each traveling motor. \x0d\ guide wheel: It acts as a guide track and is located at the end opposite to the driving force. Usually, there are two excavators. \x0d\ Zipper wheel: It supports the crawler, depending on the tonnage of the excavator. Usually there will be 1-2 on one side.