First, the connecting screw of double half rings in slewing bearing should be tightened uniformly, to ensure the uniform fitting. Then place a datum level of the slewing bearing on the large platform, Three adjustable bearings are equidistantplaced from the neutral position of the lower two steps. Three measuring frame are equidistant placed on the end face of the upper slewing ring, put the pointer on the end face of the other slewing ring. When measuring, first push the three pointer to zero, adjust the bearing, make the slewing bearing face away from the large platform, the average of three pointer is the axial clearance of the slewing bearing.
Place the slewing bearing on the platform vertically, lift a slewing ring, Measure the clearance with the dead weight of the other slewing ring, Measure three point along the circumference of 120° and take the average .Other measurements are allowed.