... arm, upper and lower quadrangled wheel, active power, main reducer, main frame and other components. It is mainly used in surface ... .8.The upper structure and operating cab: includes the main square frame, operating room, railings, ladders, hangers, mounting bracket ... System: Cummins/CAT/Weichai/Jichai diesel generator sets, power distribution cabinet, console (installed in the operating room), tubing ...