1. The coal feeder trial rotation is normal, the belt running has not deviation, has not loosening and fracture phenomenon.
2. Check the gearbox bearings to confirm that they are  complete, their oil level is above the center line, the oil level mirror is clean.
3. Manual turning, if the stranding cage cannot turn, the reason shall be detected and the measures shall be taken for handling in time.
4. Near the motor, there shall be no sundry, the anchor bolt shall be complete and firm, and the insulation shall be qualified after the electrical persons checks the insulation.(hxl)