There are several reasons why the centrifuge machine shaking and noising.Please check the following parts if you meet problem:(1) The weight of the centrifuge tube is unbalance or placed asymmetrically;(2) There is something in the rotor hole,or the load is unbalance or the tube sleeve is unqualified(3) The upper end fixing nut of the rotating shaft loose, or the rotating shaft is rubbed or bent;(4) The rotor of the motor will generate noise if not at the center of the magnetic field;(5) The fixing screw of the shock absorbing spring on the base loose or one of the springs broken;(6) The rotor itself is damaged.Attention:1. After working for a period of time, the temperature of sample may rise by 5-15℃. And you’d better not keep the machine running more than 30 minutes at a time.2. Please empty the centrifugal tubes evenly before working, working 1-2 minutes at the maximum speed, the begin to work if there is no problem.3. Please clean the tube and rotor after using and put down the cover to avoid the pollutant and dirt.4. Please open the cover and dry the tube before you are going to use when the centrifuge has not been used for a long time.5. Do not touch the rotor while it is running.6. Do not move the machine while it is running.7. Do not operate the machine if the rotor is not stably loaded.8. Please ask the technician to solve the problem if the wire and plug are damaged or electric appliances are in trouble.9. The value of rated parameters of the power plug offered by the consumer should be more than that machine and it should have well earth connection.10. Keep it away from high temperature things.11. Do not clean the machine with metal material instead of soft cloths with alkali solution.12. Do not use the machine directly in the sunlight.