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The most important component of a Roots blower during operation is the impeller; however, due to prolonged use, a range of operational failures or abnormalities can occur as a result of damage or contamination. Below is a brief analysis of the causes of faults that occur in the rotary vane blower impeller, along with corresponding solutions to address these issues. I. Impeller and impeller friction issues (1) Contaminants on the impeller cause the clearance to be too small ； (2) Gear wear, resulting in a large side clearance ； (3) The gear is not securely fixed. The impellers cannot be kept synchronized ； (4) Bearing wear causes an increase in clearance. Solution: (1) Remove dirt and check whether the internal components are damaged ； (2) Adjust the gear clearance; if the gear side play is 30%～50% higher than the average value, the gear should be replaced ； (3) Reassemble the gears to maintain a taper fit with a contact area of 75% ； (4) Replace the bearing ； II. Issues with the impeller and wall panels, as well as between the top of the impeller and the casing (1) Incorrect installation clearance ； (2) Operating pressure is too high, exceeding the specified value ； (3) Excessively high operating temperature ； (4) Deformation of the casing or base, resulting in failed fan positioning ； (5) The bearing has poor axial positioning. Solution: (1) Re-adjust the gap ； (2) Identify the cause of overloading and reduce the pressure to the specified value ； (3) Check the installation accuracy to reduce pipeline tension ； (4) Inspect and repair the bearings, and ensure the clearance. III. Stop the machine immediately in case of abnormal vibration and noise. Problems: (1) The clearance of the rolling bearings exceeds the specified value, or the bearing housings are worn ； (2) Excessive gear clearance, misalignment, and loose fixation ； (3) Collisions between impellers and between the impellers and the casing caused by foreign objects and dust ； (4) Impeller collision caused by overload and shaft deformation ； (5) Friction between the impeller and the inlet of the casing caused by overheating ； (6) The impeller loses balance due to scale or foreign objects ； (7) The anchor bolts and other fasteners are loose. Solution: (1) Replace the bearing or bearing housing ； (2) Reinstall the gear and ensure proper side clearance ； (3) Clean the blower and check whether the casing is damaged ； (4) Check the back pressure, verify whether the impeller is aligned, and adjust the clearance accordingly ； (5) Check the filter and back pressure, and increase the clearance between the impeller and the inlet of the casing ； (6) Clean the impeller and casing to ensure the proper working clearance of the impeller ； (7) Tighten the foot bolts and level the base.