What is the difference between No. 2 grease and No. 3 grease for excavators:

One, soft and hard difference.

Grease No. 2 and No. 3 is just its NKGI number, that is, the degree of penetration of the needle, No. 2 in the 265-295, the most commonly used, No. 3 of the 220-250, harder, generally used in applications requiring resistance to contamination by water or solid contaminants to reduce the wear and tear of equipment.

Two, process differences.

No. 3 is a little harder, more hand-coated, No. 2 slightly softer and harder, more machine filling, can also be hand-coated. No difference in performance.

Three, the difference in use.

According to the NLGI classification, taper (needle penetration), grease from #000 to #6, the larger the number, the harder the grease. #2 is commonly used for lubrication, and #3 is used for lubrication of heavier loads or vertical motor bearings.

Extended information:

Universal lithium grease (GB7324-1994): according to consistency grade can be divided into 1, 2, 3. It has good water resistance, mechanical stability, corrosion resistance and oxidation stability. stability, corrosion resistance and oxidation stability. It is suitable for the lubrication of rolling bearings, sliding bearings and other friction parts of all kinds of mechanical equipments, and the working temperature is -20-120℃.

Characteristics

The characteristics of lithium grease are as follows:

(1) Lithium grease, especially lithium stearate 12-grease has only two phase transition temperatures. The first phase transition temperature (i.e., from the pseudo-gel state to the gel state) is generally above 170 degrees, and the second phase transition temperature (i.e., from the gel state to the colloidal state) is generally above 200 degrees. Therefore, when choosing the right mineral oil, it can be used for a long time at 120 degrees or 2 degrees.

(2) lithium-based grease, especially 12-hydroxy lithium stearate thickened grease, its soap fibers form twisted bands with good mechanical stability.

(3) The heat of adsorption of lithium stearate and lithium stearate on alkanes was determined by gas chromatography. The results showed that the binding strength of lithium stearate and lithium stearate to the liquid phase on the surface of soap fibers and the liquid phase in the lattice were high. Therefore, the lithium-based grease has good colloidal stability.

Wikipedia Encyclopedia-Lithium-based grease