The oil return of the hydraulic motor does not go back to the tank but directly into the oil suction port of the hydraulic pump, forming a closed loop.



③ The hydraulic motor and hydraulic pump drainage line should be separately back to the tank, Hamanako machinery bucket turbine harmonic unit SHG-58-120-2UH to avoid causing its inner cavity oil pressure is too high, resulting in damage to the shaft end oil seal and oil leakage.



(4) set the necessary overload protection device, safety valve can be used, the oil return should be into the hydraulic pump oil absorption, not back to the tank. Once the bucket wheel drives the horse. Up to overload, after the safety valve open, hamenaco mechanical bucket turbine harmonic unit SHG-58-120-2UH the closed loop oil should be timely supplemented; And when the load drops, can avoid the pressure can not quickly pick up, resulting in weak drive.



Before the 1980s, most of the main engine pitch, tail car amplitude and decoupling and bucket rotation drive of the bucket wheel stacker used in China are mechanical structure. Although the performance is reliable, the harmonic unit SHG-58-120-2UH of the mechanical bucket turbine is low in efficiency, and the local force of the bucket turbine is not good, causing the common parts to be easily damaged. In the early 1980s, China imported a batch of foreign production of bucket wheel stacker-retake machine, bucket turbine pitch, tail car amplitude and decoupling and bucket rotation drive and other parts of the hydraulic system. Because the hydraulic system is highly integrated, has the advantages of small volume, easy installation and debugging, maintenance and easy maintenance, so the hydraulic driven bucket wheel stacker-retake machine is more compact structure, high efficiency, work and run more smoothly. But in the maintenance or replacement of hydraulic components, due to the restrictions of the conditions at that time, the hydraulic components and domestic manufacturers of hydraulic components do not match, must be imported from abroad.