CAUTION : Choose the grease type to be used according to those descriptions. 

1. The grease should have a lithium soap and should include EP additives that increase the resistance to high pressure. 

2. The NLGI class, which represents the viscosity of the grease, should be used according to the temperature measures that are described in the table below. If there is a significant temperature difference in the environment in which the system is used, the remaining grease in the system must be replaced with the grease that has the correct NLGI class for the said environment. 

3. The base oil viscosity of the grease should be between 32-220mm²/s at 40*C (The structure of grease is similar to of sponges’s the higher the base oil viscosity, bigger the volume inside the pores and so, the grease gets thicker.)

4. The grease that will be used should never contain additives such as molibden, graphite or copper. Greases that say complex in their descriptions should be investigated. If Lithium complex or Calcium complex greases are being used, check if they contain molibden, graphite or copper. If they do not contain such additives, use one NLGI class below the recommended NLGI Class by the table below. 

5. Different greases with different NLGI classes should never be used together. Also liquid oil should never be added to the grease to decrease its viscosity. 

6. Different greases with different soap types (like lithium or calcium) should never be used together. If mixed, they may cause a chemical reaction. If the grease inside the pump is going to be changed, fully empty the reservoir and only then put the new grease type. 

7. The grease which will be filled into the reservoir of the pump should be fully clean from any debris, dirt etc. During filling, no foreign material should get into the reservoir. 

8. If a sample of the grease which is going to be used is available, check with your fingers if the grease contains small solid particles. Also the grese should not have sticky properties. 

Penetration and NLGI Classes

The fluidity of liquid oils are represented with measuring numbers. For greases, the endurance, resistance and penetration is measured. Penetration is defined as plunging depth and measured by putting a conical item into the grease. According to the norms, the penetration is shown as 1/10mm’s. For ease of use it has been divided into 9 types. Those are the NLGI- types. For soft and fluid greases, the plunging depth increases. The table below represents the appropriate NLGI types for ALLFETT Automatic Lubrication Systems and their suitable working ambient temperatures.

NLGI 00Working ambient temperature 
-30°C between -10°C
NLGI 0Working ambient temperature 
-10°C between 0°C
NLGI 1Working ambient temperature 
0°C between 10°C 
NLGI 2Working ambient temperature 
10°C between 30°C
NLGI 3Working ambient temperature 
30°C and higher
At lower ambient temperatures, the penetration difference should be taken into account for perfect lubrication.