Factors that affect the frequency of grease addition? There are many factors that affect the frequency of grease addition. Generally speaking, the smaller the bearing and the faster it rotates, the less frequently grease is added. Bearings with larger sizes and slower speeds require more frequent grease additions. The main factors are as follows: Different types of bearings require different greasing frequencies: Radial ball bearings = basic frequency. Cylindrical roller bearing = 5 times the fundamental frequency. Thrust rollers and roller bearings = 10 times fundamental frequency operating temperature


How to Add Bearing Grease
Higher temperatures increase the rate of grease oxidation, doubling for every 18°F (10°C) above 150°F (65°C). For example: a bearing operating at 250°F (120°C) will typically require 10 times more grease than a bearing operating at 150°F (65°C). Also, as the temperature increases, the grease begins to soften and may become fluid and leak out of the bearing housing. High-temperature operation requires more frequent grease additions; high-temperature grease reduces this frequency. Environmental conditions: If the bearing operates in a polluted environment, the frequency of greasing needs to be increased. Be sure to note any abnormalities in the lubrication report, such as high temperatures, noise, vibration or leakage in the bearings. Adding Grease Between Flushes Many rolling bearings require the addition of small amounts of grease between grease flushes. It is best to use a low-pressure grease gun when adding grease. If the seal is in good condition, the amount and frequency of grease injection should be reduced. 1) Check the grease inventory in the bearing - remove the pipe fitting or grease drain plug and check whether there is excess grease flowing out. 2) Check the bearings and seals for excessive leakage. 3) A few "injections" of fat per time are enough. Do not add too much grease!

Grease flush
Regarding grease flushing, the following "pressure reduction" methods are recommended. For bearings with fittings and drain holes:
1) Remove the lower drain plug; clean out all hardened grease.
2) Wipe the grease fittings clean.
3) Pump the grease into the pipe fittings until all the old grease is replaced and new grease appears. It is best to be able to run the machine while performing this task under conditions that ensure safety and feasibility.
4) While removing the oil drain plug, allow the machine to operate at operating temperature. This distributes the grease evenly and forces excess grease to be squeezed out through the drain orifice, thus relieving internal pressure. When normal pressure is reached in the bearing box (about 10-30 minutes), excess grease will stop being discharged.


Common types of lubricants
1. Mineral oil: It is refined from petroleum. The main component is hydrocarbons and contains various additives. According to the different molecular structures of hydrocarbons, it can be divided into alkanes, cycloalkanes, aromatic hydrocarbons and unsaturated hydrocarbons. Mineral lubricating oils are divided into three categories: distillate lubricating oils, residual lubricating oils, and blended lubricating oils. 1) Distillate lubricating oil has low viscosity, light weight, and usually contains less asphalt and colloid. Such as high-speed machinery oil, turbine oil, transformer oil, instrument oil, refrigeration oil, etc. 2) Residual lubricating oil has high viscosity and heavy weight. Such as aviation engine oil, steel rolling oil, cylinder oil, gear oil, etc. 3) Blended lubricating oil is a mixture of distillate lubricating oil and residual lubricating oil. Such as gasoline engine oil, diesel engine oil, compressor oil, industrial gear oil, etc. 2. Synthetic oil (synthetic grease): It is a lubricating oil with certain characteristic structure and performance obtained by organic synthesis. Synthetic oil has better performance than natural lubricating oil. When natural lubricating oil cannot meet the existing working conditions, synthetic oil can generally be used instead, such as silicone oil, fluorinated ester, silicate ester, polyphenylene ether, fluorinated ester, etc. Chlorine carbon compounds, diacetate, phosphate ester, etc. 3. Water-based lubricating oil: Two mutually immiscible liquids are processed so that one liquid is dispersed and suspended in the form of fine particles (about 0.2-50 microns in diameter) in the other liquid, which is called emulsified oil, or emulsion. Such as water-in-oil or oil-in-water emulsified oil, water-ethylene glycol hydraulic oil, etc. Their main functions are fire resistance, cooling, fuel saving, etc. 4. Grease: The thickener is evenly dispersed in the lubricating oil to obtain a viscous semi-fluid bulk substance, which is called grease. It is composed of three parts: thickener, lubricating oil and additives. Usually thickener accounts for 10%-20%, lubricating oil accounts for 75%-90%, and the rest is additives. 5. Solid lubricant: A powdery or film-like solid substance used to reduce friction and wear between relatively moving load-bearing surfaces. It is mainly used for friction parts where grease cannot or is inconvenient to be used. Commonly used solid lubricating materials include: graphite, molybdenum disulfide, talc, polytetrafluoroethylene, nylon, tungsten disulfide, fluorinated graphite, lead oxide, etc. 6. Gas lubricant: Use certain inert gases such as air, nitrogen, and helium as lubricants. Its main advantage is that the friction coefficient is less than 0.001, almost equal to zero, and is suitable for the lubrication of precision equipment and high-speed bearings.