This product is a walking device integrated motor and gear. By an integrated internal gear dual displacement axial piston motor, walking reducer. Built-in safety valve motor, anti-reverse valve, parking brake and the level of the second gear shift device, which is characterized by: the transmission ratio range, compact, high efficiency, reliability, small size, smooth motion, low noise etc., and a multi-level security, long life and other advantages. For hydraulic crawler walking device driver.