After the girth gear is installed, its radial runout and end face runout should be detected. The radial runout F is based on the gear axis and has a value equal to the algebraic difference between the maximum and minimum values of the radial deviation. The end face jump is based on the gear axis, and the gear end face and the axis line are not perpendicular.

A dial gauge E is placed at the midpoint of girth gear tooth width. The micrometer pointer is to be vertically measured to measure the radial runout of girth gear; a dial gauge A is placed on the end face of the girth gear to measure the end face runout of the girth gear; two dial gauges B and C are respectively placed at the shoulder of the ball mill trunnion and separated by 180°, to measure the amount of inter-axis movement of the ball mill itself, to correct the data of the girth gear end runout of gauge A.

After the dial gauge is set, adjust the pointers of each gauge so that the pointer is aligned with the reading "0.00mm". The large girth gear is evenly divided into several points as detection points. Rotate the cylinder, read the reading of the dial gauge at the corresponding point, and record the data, and finally return to the zero point, the reading of the E meter is still "0.00mm", and then the radial deviation value of each point of the large girth gear is detected. The difference between the maximum deviation value and the minimum deviation value is the radial runout of the large girth gear. 

The reading of the gauge A at a certain point minus the corresponding reading of Gauge B is the end face runout deviation value of the point, and the difference between the maximum deviation value and the minimum deviation value is the end face runout amount of the girth gear.

According to the specification requirements: the radial runout of the large ring gear, the diameter of the pitch circle per meter should not exceed 0.25mm; the end face of the large ring gear beats, the diameter of the pitch circle per meter should not exceed 0.35mm. If it is out of tolerance, it needs to be adjusted.

In order to eliminate excessive end face runout, it can be adjusted by adding a metal gasket between the large ring gear and the contact surface of the end cap until the specification is met.

There is a certain gap between the inner cylindrical surface of the girth gear and the cylindrical surface of the cylinder flange. After detecting the radial runout of the girth gear, the gap value between the two cylindrical mating faces is measured according to the corresponding point, and the average value of the gap is calculated. Adjust the flange connection bolts, adjust the gap of each measurement point according to the calculated average value of the gap, so that the radial runout deviation caused by the installation error can be basically eliminated. If the radial runout is still out of tolerance, the adjustment can be continued. Under the premise of eliminating the installation error, the radial deviation caused by other causes should be also minimized, so that the radial runout is at or near the specification. After the adjustment is completed, the maximum and minimum deviations of the girth gear radial runout shall be marked and recorded in the equipment file in detail to facilitate adjustment of the meshing clearance of the gear pair.