Here Pump connection schematic including diagram A pump coupling is the element used to connect the rotating pump shaft to the drive shaft of the motor; enabling the motor to efficiently transmit power to the pump. When a pump is close coupled, a separate coupling is not required as the motor is directly mounted to the pump on a single shaft pump shaft is the central component of a pump rotor and carries the impellers, the shaft sleeves (e. g. spacer sleeves between the impellers or shaft protecting sleeves in the shaft seal area), the bearings (rolling element bearings or plain bearing sleeves and thrust collars), in some cases balance. for more details of Pump connection schematic download this file .