The high pressure hydraulic system effectively reduces the volumes of hydraulic units, saves the usage quantity of hydraulic oil, and eases the maintenances.The water-proof connectors, good circuit protection, lifelong maintenance-free battery, and advanced engine malfunction diagnostic technology for the whole machine eliminate the troubles arising from the malfunction of electric system. The air suspension traveling system always keeps the close contact between track rollers and tracks to increase the ground area of tracks and improve the traction force of the machine.