The pressure accumulator and power cylinder assembly are important components of the pneumatic hydraulic suspension assembly, which are important links to attenuate the vehicle body vibration and ensure the smooth running of the vehicle at high speed. Crawler oil cylinder is mainly used to support the tensioner of the vehicle's track, so as to keep the vehicle's track at the proper tightness and ensure the stable and effective driving of the vehicle body. The solenoid valve group controls the action of each actuating element.