1, control friction: friction between the friction surface to join the lubricant, forming a lubrication film, reduce the friction surface between the metal direct contact, so as to reduce the friction coefficient, reduce friction resistance to reduce power consumption.

2, reduce wear: lubricating film with a certain intensity of friction between surfaces, capable of supporting a load, to avoid or reduce the direct contact with the metal surface, which can reduce the plastic deformation, melting welding, bonding and other kinds of cut and adhesive wear contact surface.

3, cooling: lubricant can reduce the friction coefficient, reduce friction heat generation.

4, sealing and isolation: Lubricants especially grease covered on the friction surface and other metal surfaces, isolate moisture, moisture and other harmful metal and medium contact, so as to reduce the corrosion and abrasion, prevent rusting, protects the surface of the metal.

5, to reduce the vibration, shock and vibration can be lubricant mechanical energy into hydraulic energy, to reduce the impact, the effect of noise absorption

With a large amount of fat, the friction torque is increased, the temperature is increased, the amount of fat is increased, and the amount of fat is too low, so that it can not obtain reliable lubrication and dry friction. Generally speaking, the suitable amount of fat content is 1/3 ~ 1/2 of the total void volume in the bearing. However, in accordance with the situation, and sometimes should be coated with grease in the bearing edge of the cavity lubrication.

To avoid loading the cross use of grease containers and tools, otherwise, will be on the lipid produced drop point decline, cone penetration increased and mechanical stability and less adverse effects.

Due to run fat varieties, the quality are in continuous improvement and change, the old equipment to switch to the new grease, should first test and trial rear can use formal; in the replacement of the new fat, should first remove the waste grease, the parts clean. In addition to the grease, should be spent grease out of the grease in the mouth to see the new grease.

Grease can reduce mechanical friction, prevent metal aging and prevent leakage, oil leakage, water leakage, to ensure the normal operation of machinery and equipment. And the use of lubricants, the general need to consider the following factors:

Temperature: the temperature of grease has great influence, if the environment and mechanical operating temperature is higher, should choose the high temperature resistant grease.

Speed: high-speed operation of the mechanical parts of the temperature rise and high and fast, easy to make grease thinning and erosion, fused to a greater degree of lubricating grease should be selected and used.

Load: due to the relationship between the magnitude of cone penetration of lubricating grease to use can bear the load, load large to use cone penetration small (fused to a greater degree of grease; if under heavy load and shock load, should use containing extreme pressure additives of lubricating grease, such as containing molybdenum disulfide grease.

Special parts requirements: according to the different mechanical working environment and selection. In humid conditions should be used with strong water resistance grease; in the environment with more dust using thick containing graphite grease; under the acidic environment is selected by grease; such as the sealing have special requirements, should choose barium grease.

It is an effective measure to improve the anti friction and anti - Wear Properties of all the moving parts of engineering machinery by using the lubricating grease. Due to the special environment of construction machinery, its service life is greatly affected, and the performance of the whole machine is seriously affected. To this end, only a clear understanding of the failure mechanism of grease can be done to its proper use.