Loader with diaphragm tank design, its purpose is to make the oil absorption and return oil is separated, prevent from the system back again directly in the oil pump, oil to prevent dirt, bubble into the system, causes the damage of equipment, shorten the service life of equipment, returned from the system return hose into the tank back to the oil, the oil in the block by the diaphragm, oil level rise after the overflow bypass baffle plate, back in the oil pump, so that large particles of dirt by baffle block in the region, however, the traditional baffle plate and the flow of the tank wall gap is too small, if oil velocity, flow a lot of noise, while crossing the barrier or tank deformation, As a result, the flow gap between the baffle and the tank wall is smaller, which makes the interference between the baffle and the tank wall cause abnormal noise of the tank.