Excavator is a construction machine with the following capacities: commonly used in construction. often used to excavate foundation pits deeper than the natural ground position, the machine usually stands a excavation site piled on the shore or dumped on transport vehicles. In construction machines and construction machines, excavators The excavator is the most diversified by the moving bridge, the operating principle or the bucket type which is divided into wheel loader, crawler excavator, loader excavator, rope excavator, wheel loader, bucket excavator, bucket bucket excavator, bucket digger excavator, bucket grab excavator, rope bucket excavator Crawler excavator: is a type of excavator with a moving set that uses a chain similar to a tank type, due to the specific construction work in diverse terrain areas, difficult to access. , weak ground so often use crawler for it to increase the firmness. However, its disadvantages are not mobile.