transit mixers hydraulic control ,easy operate convenient for use and maintenance hydraulic overload protect transit mixersHBTD series concrete pumps are double cylinders piston type concrete pump with middling output and middling pressure ,it is driven by electromotor and move by tyre ,it is also can be stable type or track type ,there is two basic type :HBTD30-06-45 HBTD40-07-75 ,The output ...