detail of the undercarriage of a caterpillar tractor excavator that and the shovel to extract earth from the ground of a city

excavator caterpillar tractor backhoe bucket teeth bulldozer construction sit site worker crawler demolition development dig digger diggingmachinery discharge discharging dozer earthmover earthwork excavating loader heavy machinery hydraulics landscape offload reconstruction sand scoop scraper shovel soil street unload workout workplace belt build chain clay dirty drive earth mover excavation pebble truck wheel detail undercarriage that extract from ground city sidewalk sidewalk