This product needs to be connected to an oil pump before it can be used. Before running the motor, make sure the motor is filled with hydraulic oil. The product cannot be rotated by hand or air pumpAvoid using it under the conditions of maximum speed and pressure at the same time.Note shaft diameter: 25mmHighly strong steel, finely crafted, high torque, forward and reverse rotation, low noise.These hydraulic motors are designed for medium-duty applications.Suitable for hydraulic systems, trailers, trucks, ice and snow equipment, tool boxes, etc.Efficient, small, compact and powerful.