One of the reasons: the bearing is short of oil or grease, oil deterioration or grease dry solid, too much oil or too much grease.

1. Inspection method

(1) Observe the oil level from the bearing frame or bearing body

(2) Check whether the oil is deteriorated

(2) Remove the bearing gland and check the grease quantity and quality

2. State characteristics

(1) The oil is lower than the oil level

(2) Oil metamorphism

(3) Excessive grease

(4) The grease is dry or deteriorated

3. Treatment method

(1) Make up the oil level

(2) Change oil or grease

(3) Open the bearing gland and take out some grease to make 1 / 2 to 2 / 3 grease in the bearing

The second reason: Bearing rust, or there are iron dust

1. Inspection method

(1) Remove the bearing for inspection

(2) Use special measuring rod or screw driver to listen to the running sound of bearing

2. State characteristics

(1) There is rust or iron dust in the bearing roller or raceway

(2) The bearing is noisy and hot during operation

3. Treatment method

(1) Clean the bearing

(2) Replace the bearing with a new one

The third reason: the bearing roller or the outer circle of roller inner ring or outer ring has low hardness.

1. Inspection method

(1) Observe the inner and outer surface movement trace of roller, roller and inner ring and outer ring of bearing;

(2) The hardness of the bearing is less than RC60.

2. State characteristics

(1) The inner and outer surfaces of rollers, inner rings and outer rings have fish scale patterns;

(2) The hardness is less than RC60;

(3) Bearing sound heating

3. Treatment method

Replace the bearing

The fourth reason: the bearing accuracy is low and unqualified.

1. Inspection method: clean the bearing, put your finger through the hole, turn the outer ring of the bearing with the other hand, or send it to the bearing testing machine for testing

2. State characteristics:

(1) Turning the outer ring by hand makes a rustling sound, and the fingers feel uneven;

(2) Bearing noise and heating

3. Treatment method: replace the bearing with a new one