To solve any grease-related problem, it is essential to understand that grease is not a universal product, but an engineered component that needs to be precisely matched. The solution follows a logical closed loop of "diagnostics-selection-application-management".

The first step is to accurately diagnose the root cause of the problem

First, like a doctor, you need to observe the "symptoms" and find the root cause. Common problems usually manifest in the following categories:

• Failure performance: grease drying and hardening, thinning loss, abnormal color, pungent odor.
  

• Equipment performance: abnormal heating of bearings, increased noise or vibration, wear or corrosion, leakage at the seal.
  

• Process performance: Product contamination (e.g. in the food industry), increased energy consumption, and frequent equipment downtime.
  

There is a technical reason behind every superficial phenomenon. For example, grease dries and hardens, most likely due to long-term high temperatures that cause it to oxidize, or other incompatible greases are mixed. Bearings heat up, which may be due to excessive grease filling (causing heat stirring), grease performance cannot withstand high speeds or loads, or grease has failed.

The second step: follow the picture and select the model scientifically

This is the core of the solution. The correct selection must systematically weigh the following five key dimensions, like a five-tooth key:

1. temperature
   

   • High temperature challenge (> 150 ° C): Greases with synthetic oils (e.g. PAO, esters) as base oils and thickeners such as complex lithium, polyurea or complex calcium sulfonate must be selected. They have higher drop points and excellent oxidation resistance.
     

   • Low temperature challenge (
     

   • Temperature fluctuations: wide-temperature synthetic grease is the only option.
     

2. Load and speed
   

   • High load or impact load: The grease must contain sufficient amount of extreme pressure anti-wear additives, such as molybdenum disulfide, graphite or special organic extreme pressure compounds. These additives can form a protective film on the metal surface to prevent wear and pitting.
     

   • High speed: grease with low viscosity of base oil, excellent mechanical stability (not easy to be shearing and thinning), and reduced friction resistance should be selected. Consistency is usually not too hard (commonly used in NLGI No. 2).
     

3. environment
   

   • Water or moisture: Greases with excellent water resistance are preferred, such as complex calcium sulfonate, polyurea, or traditional calcium grease. They are not easily emulsified and lost in contact with water, and can maintain a good lubrication structure.
     

   • Chemical corrosion: In the presence of acids, alkalis or solvents, it is necessary to check the chemical inertness of the grease and the compatibility of the sealing material. Synthetic hydrocarbons or some specialty greases may be more suitable.
     

   • Cleanliness requirements: In the food, pharmaceutical or electronics industries, food-grade greases that have passed relevant certifications must be used to ensure that they are non-toxic, odorless, and less prone to the growth of bacteria.
     

4. compatibility
   

   • This is a trap that is often overlooked. Mixing greases with different chemical compositions can cause the colloidal structure to break down and fail immediately. When unsure of compatibility, the safest course of action is to completely remove the old grease and replace it with a new one.
     

5. method of raising
   

   • Manual grease gun filling, automatic grease dispenser or centralized lubrication system? This determines the required pumping and appropriate consistency of the grease. Centralized lubrication systems typically require a more fluid grease.
     

Step 3: Standardize the application to avoid "doing bad things with good intentions"

Even if the right fat is selected, the wrong filling method can lead to failure.

• Cleaning first: Before adding new fat, be sure to clean the oil injection nozzle and surrounding area to prevent contaminants from being introduced.
  

• The principle of right amount: For rolling bearings, a key criterion is "fill the space, leave no space". For high-speed bearings, only 1/3 to 1/2 of the internal space is usually filled. Overfilling will cause a sharp increase in the heat of stirring, which will accelerate grease aging and bearing damage.
  

• Regular maintenance: Follow the cycle recommended by the equipment manufacturer or lubrication specialist for replenishment or replacement, and establish a maintenance plan based on time and operating status.
  

Step 4: Establish Systematic Lubrication Management

For enterprises with a large number of devices, the solution needs to rise to the management system level.

1. Develop lubrication standards: Establish "lubrication cards" for each key equipment, lock in the brand, model, filling amount and cycle, and achieve standardization.
   

2. Condition monitoring: Adopt predictive maintenance tools, such as regular sampling for grease analysis, to monitor the degree of contamination, wear metal content, and changes in physical and chemical indicators, and actively intervene before failures occur.
   

3. People and tools: Provide maintenance personnel with the correct tools (such as dosing guns) and lubrication knowledge training of the system to correct the common misconception that "more grease is better".
   

4. Leverage professional strength: establish cooperation with excellent lubrication product suppliers or technical service providers. They can provide on-site diagnostics, lubrication audits, customized solutions and product trials, and are valuable external brains for quickly solving complex problems.
   

How do I get started?

If you are facing a specific lubrication issue, you can start by describing the following information:

1. What is the equipment? (e.g. fan motor bearings, conveyor chain plates, heavy-duty gearboxes)
   

2. What specific phenomenon has occurred? (For example: monthly fat replenishment but still abnormal noise, serious oil leakage in high temperature season)
   

3. What environment does it work in? (For example: outdoor dusty, production line water vapor washing, indoor constant temperature)
   

4. What grease are you currently using?
   

Armed with this information, you can analyze it yourself along the above lines, or communicate effectively with professionals to find a true solution to the root cause of grease.