wheeled excavation is small in size and wheel drive, the migration nimble convenient. excavation string transferring is 180°, it operates simply, maintains conveniently, and the price is reasonable. it is widely used in city municipal engineering, cable trench, running water repairing, gas piping construction, highway construction, garden construction, irrigation, house construction, coal mine, brick kiln and earth working. the caterpillar excavator power is big; the excavation string transfers the omni-directional 360 degrees. it is widespread used in each construction; it is constructor's good helper.