... liquid material. Classification of Centrifugal Pump1. according to structure, it can be divided into three- ... , for generally, two-thirds to three-quarters of volume, too much will fever, too little will ... as lubricant; the oil should full to oil line. Too much will leak, too little the bearing ... generally run in about 60 °C, too much higher need to find out reasons (whether impurity, whether oil ...