Bearing is Roots blower is one of the main transmission parts of the Roots blower, is one of the more important parts of the Roots blower, because the bearing in operation often do high-speed movement, so it is prone to wear and tear or damage, the bearing if damaged fan can not run normally, so it is necessary to check the bearings often, just in case. Bearing inspection program first, dismantle the bearing, first check the inner ring, outer ring, rolling body and keep frame is broken. Secondly, wash the bearings with kerosene and wipe them dry, then check the surface finish and whether there is any defect such as discoloration, corrosion, black spot, pitting, indentation, scratches, peeling, cracks and so on. Third, check whether the shape and size of the rolling body are the same, and whether the cage is loose. Fourth, check whether the bearing rotation is flexible and whether the position of the cage is normal. When checking, pluck the bearing rotation by hand, and then let it decelerate and stop by itself. A good bearing, rotation should be rotating smoothly, a slight rattle, but no vibration, stop should be gradually decelerated, no reversal phenomenon after stopping. Fifth, . Check the radial clearance and axial clearance of the bearing to see if it meets the technical requirements.