Burning hot

If runing after a of time,the motor is burning hot,it can be caused by the one of the following reasons:

1.Motor bearing is damaged,the matching gap is too small to meet the require.

2.The axle and the bearing are mounted skew, and the two bearings are not coaxial.

3.Pipe network resistance is too high,motor run in overload condition.

4.The power supply is too low.