How to check if the lubricating grease of imported bearings is moldy

1. Sunshine irradiation method

In a sunny life, use a screwdriver to remove grease and fly to 45 degrees. Compared to the sun, when observing the condition of liquid droplets, it is clear that there are no debris in the lubricating grease under sunlight, which can be effective again. When there is too much debris, the lubricating grease must be replaced.

2. Droplet imprinting method

Take a clean white filter paper and let a few drops of oil leak from the filter paper. If there is black powder on the surface after the oil leak and there is resistance when in contact with hands, it indicates that there is a lot of residue in the oil, there is no powder in the oil, it is dry and clean, and the imprint is light yellow.

3. Oil discharge observation

Take two beakers, one filled with oil for testing, and the other empty on the table. Remove the beaker containing oil from the tabletop by 30 to 40 centimeters and tilt it, allowing oil to flow into the empty cup and observing its fluidity. High performance and cost-effective lubricants are longer, thinner, more uniform, and more continuous. If the oil is discharged quickly and slowly, it is said that the oil has become moldy.

4. Hand twisting method

Twist the grease between the thumb and ring finger and continue grinding. The oil has a good texture, good wettability, minimal wear and debris, and no friction. If you feel a lot of friction in the middle of your fingers like sand, it indicates that there is a lot of residue in the oil and cannot be reused. Replace with new lubricating grease.